mirror of
https://github.com/shankar0123/certctl.git
synced 2026-06-07 13:51:36 +00:00
feat(deploy): atomic write + validate + rollback primitive shared across all target connectors
Phase 1 of the deploy-hardening I master bundle. Closes the load-bearing prerequisite for the seven Bundle I items by extracting one canonical atomic-deploy primitive at internal/deploy/ that all 13 target connectors will consume in Phases 4-9. The package ships: - Plan + Apply API: write all File entries to sibling .certctl-tmp.<nanos> in the destination directory (same-filesystem guarantees os.Rename atomicity), call PreCommit (validate-with-the-target), atomic-rename all temps to final, call PostCommit (reload). On PostCommit failure, restore from pre-deploy backups + re-call PostCommit. If second PostCommit also fails, return ErrRollbackFailed (operator-actionable; documented loud). - AtomicWriteFile lower-level entry for connectors that don't fit the Plan model (F5, K8s — they ship bytes through APIs, not local files). - SHA-256 idempotency: every Apply short-circuits when all File destinations already match SHA-256 of new bytes. Defends against agent-restart retry storms hammering targets with no-op reloads. - Ownership + mode preservation: existing nginx:nginx 0640 stays nginx:nginx 0640 across renewals. Per-target FileDefaults applies for first-deploy. Per-File explicit Mode/Owner/Group overrides win over both. Closes the silent-failure mode where os.WriteFile(path, bytes, 0600) at apache.go:119 (et al.) clobbered worker access. - Backup retention janitor: pre-deploy backup at <path>.certctl-bak.<nanos>; default keeps last 3 (DefaultBackupRetention); BackupRetention=-1 disables backups (rollback impossible — documented foot-gun). - File-level mutex via sync.Map: two concurrent Apply calls touching the same destination serialize. Per-target serialization (Phase 2) is finer- grained at the agent dispatch layer; this is the file-level guard. - Sentinel errors for connector errors.Is checks: ErrPlanInvalid, ErrValidateFailed, ErrReloadFailed, ErrRollbackFailed. Tests (37 named cases across deploy_test.go + coverage_test.go) pin every load-bearing invariant the prompt's Phase 1 requires, plus error-leg coverage uplifts: - TestApply_HappyPath_PreCommitSucceeds_PostCommitSucceeds_FilesAtomic - TestApply_PreCommitFails_NoFilesChanged (atomic-or-nothing on validate) - TestApply_PostCommitFails_FilesRolledBack (rollback wire) - TestApply_RollbackAlsoFails_ReturnsErrRollbackFailed (escalation path) - TestApply_IdempotentSkip_SHA256Match (idempotency short-circuit) - TestApply_PreservesExistingOwnerAndMode_WhenNotOverridden - TestApply_RespectsOverrides_OwnerGroupMode - TestApply_ConcurrentApplyToSameFile_Serializes (file-level lock) - TestApply_BackupRetention_KeepsLastN (janitor pruning) - TestApply_NoExistingFile_UsesDefaultsForOwnerGroupMode - TestAtomicWriteFile_TempFileCleanedUpOnError - TestAtomicWriteFile_RenameRaceWithReader_AtomicReadAlwaysSeesOldOrNew (POSIX-rename atomicity proof via concurrent reader) Plus white-box tests for resolveOwnership, lookupUID/GID, and deeper error legs in restoreFromBackups + applyOwnership + AtomicWriteFile. Coverage 87.3% — practical ceiling without injecting a fault-aware FS abstraction (Write/Sync/Close OS errors are unreachable from go test without sudo'd disk-fill or a custom interface seam). Above the existing service-layer 70% floor; Phases 4-9 will lift this further as they exercise the package through real-connector use. Race detector clean; gofmt + go vet + golangci-lint v2.11.4 all 0 issues. The package is the load-bearing prerequisite for Phases 4-9. Phase 2 next: per-target deploy mutex in cmd/agent/main.go. Spec: cowork/deploy-hardening-i-prompt.md Baseline + recon: cowork/deploy-hardening-i/baseline.md
This commit is contained in:
shankar0123
@@ -0,0 +1,327 @@
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package deploy
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"sort"
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"time"
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)
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// Apply executes plan as one atomic deployment. See package doc and
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// the Plan-type comments for the full algorithm contract; the
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// summary:
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//
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// 1. Validate the plan shape (no empty paths, no dupes).
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// 2. Per-file SHA-256 check; if every file already has identical
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// bytes and !plan.SkipIdempotent, return early with
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// SkippedAsIdempotent=true.
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// 3. Lock every file path in the plan (sorted to avoid deadlocks
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// when two concurrent Applies share some paths).
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// 4. Backup every existing destination.
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// 5. Write every file to its sibling .certctl-tmp.<unix-nanos>;
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// apply ownership (chmod + chown) to each temp.
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// 6. Call PreCommit(ctx, tempPaths). On error: clean up all temp
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// files; backups stay (operator may want to restore manually).
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// Return ErrValidateFailed.
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// 7. os.Rename every temp → final, in plan-order. We don't try to
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// "rollback" a partial rename mid-loop — we trust os.Rename to
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// either succeed or fail-fast within the same filesystem; if a
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// mid-loop rename fails, we attempt rollback of the renames
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// that already succeeded.
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// 8. Call PostCommit(ctx). On success: prune old backups; return.
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// 9. On PostCommit error: restore each File from its backup;
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// re-call PostCommit. If second PostCommit also fails, return
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// ErrRollbackFailed (operator-actionable; deploy is in known-
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// bad state).
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//
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// The PreCommit/PostCommit hooks may be nil; nil = "no-op step".
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func Apply(ctx context.Context, plan Plan) (*Result, error) {
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start := time.Now()
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if err := validatePlan(plan); err != nil {
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return nil, err
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}
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// Lock every path in sorted order to defend against the
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// classic AB/BA deadlock when two concurrent Applies overlap
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// in their file sets.
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absPaths := make([]string, len(plan.Files))
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for i, f := range plan.Files {
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abs, err := filepath.Abs(f.Path)
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if err != nil {
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return nil, fmt.Errorf("resolve path %s: %w", f.Path, err)
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}
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absPaths[i] = abs
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}
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sortedPaths := append([]string(nil), absPaths...)
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sort.Strings(sortedPaths)
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unlocks := make([]func(), 0, len(sortedPaths))
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defer func() {
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// Release in reverse order. Standard mutex hygiene.
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for i := len(unlocks) - 1; i >= 0; i-- {
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unlocks[i]()
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}
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}()
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for _, p := range sortedPaths {
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unlocks = append(unlocks, lockFile(p))
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}
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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res := &Result{
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BackupPaths: make(map[string]string, len(plan.Files)),
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}
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// 2. Idempotency short-circuit.
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if !plan.SkipIdempotent {
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allMatch := true
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for i, f := range plan.Files {
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abs := absPaths[i]
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existing, err := os.ReadFile(abs)
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if err != nil {
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allMatch = false
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break
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}
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if !sha256Eq(existing, f.Bytes) {
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allMatch = false
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break
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}
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}
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if allMatch {
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res.SkippedAsIdempotent = true
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res.Duration = time.Since(start)
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return res, nil
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}
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}
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// 3. For each file: stat existing, resolve ownership, prep
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// the per-file work plan.
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preps := make([]*filePrep, len(plan.Files))
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for i, f := range plan.Files {
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abs := absPaths[i]
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stat, statErr := os.Stat(abs)
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existed := statErr == nil
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owner, err := resolveOwnership(f, plan.Defaults, ownershipStat(stat, statErr))
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if err != nil {
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return nil, fmt.Errorf("file %d (%s): resolve ownership: %w", i, abs, err)
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}
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preps[i] = &filePrep{
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abs: abs,
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file: f,
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owner: owner,
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hadOrig: existed,
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}
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}
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// 4. Backup every existing destination BEFORE writing any
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// temp file. If any backup fails, abort with no on-disk
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// changes to live files.
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if plan.BackupRetention != -1 {
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for _, p := range preps {
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if !p.hadOrig {
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res.BackupPaths[p.abs] = ""
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continue
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}
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backupPath, err := backupFile(p.abs)
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if err != nil {
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// Clean up any backups already taken.
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cleanupBackups(res.BackupPaths)
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return nil, fmt.Errorf("backup %s: %w", p.abs, err)
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}
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p.backupTo = backupPath
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res.BackupPaths[p.abs] = backupPath
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}
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}
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// 5. Write every file to a sibling temp + apply ownership.
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tempPaths := make(map[string]string, len(preps))
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cleanupTemps := func() {
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for _, p := range preps {
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if p.tempPath != "" {
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_ = os.Remove(p.tempPath)
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}
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}
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}
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for _, p := range preps {
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tempPath, err := writeTempFile(p.abs, p.file.Bytes)
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if err != nil {
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cleanupTemps()
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return nil, fmt.Errorf("write temp for %s: %w", p.abs, err)
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}
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p.tempPath = tempPath
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tempPaths[p.abs] = tempPath
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if err := applyOwnership(tempPath, p.owner); err != nil {
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cleanupTemps()
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return nil, fmt.Errorf("apply ownership to temp for %s: %w", p.abs, err)
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}
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}
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// 6. PreCommit (validate-with-the-target).
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if plan.PreCommit != nil {
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if err := plan.PreCommit(ctx, tempPaths); err != nil {
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cleanupTemps()
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return nil, fmt.Errorf("%w: %v", ErrValidateFailed, err)
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}
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}
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res.ValidateOK = true
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// 7. Atomic rename each temp → final. If a mid-loop rename
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// fails, attempt to restore the renames that already
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// succeeded (a degraded form of rollback — better than
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// leaving a half-deployed state).
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doneRenames := make([]*filePrep, 0, len(preps))
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for _, p := range preps {
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if err := os.Rename(p.tempPath, p.abs); err != nil {
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// Mid-loop rename failure. Roll back what we did.
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rollbackErr := restoreFromBackups(doneRenames)
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cleanupTemps()
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if rollbackErr != nil {
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return res, fmt.Errorf("%w: rename %s mid-loop, rollback also failed: %v (rename: %v)", ErrRollbackFailed, p.abs, rollbackErr, err)
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}
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return res, fmt.Errorf("rename %s: %w", p.abs, err)
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}
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doneRenames = append(doneRenames, p)
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}
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// 8. PostCommit (reload).
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if plan.PostCommit != nil {
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if err := plan.PostCommit(ctx); err != nil {
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// Rollback: restore + re-PostCommit.
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rollbackErr := restoreFromBackups(preps)
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if rollbackErr != nil {
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res.Duration = time.Since(start)
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return res, fmt.Errorf("%w: PostCommit failed (%v) AND rollback restore failed (%v)", ErrRollbackFailed, err, rollbackErr)
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}
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// Restore succeeded; re-call PostCommit against the
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// previous bytes. This is the second PostCommit; if
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// IT also fails, we're in operator-actionable state.
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if err2 := plan.PostCommit(ctx); err2 != nil {
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res.Duration = time.Since(start)
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return res, fmt.Errorf("%w: PostCommit failed (%v) AND second PostCommit after restore also failed (%v)", ErrRollbackFailed, err, err2)
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}
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res.RolledBack = true
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res.Duration = time.Since(start)
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return res, fmt.Errorf("%w: %v", ErrReloadFailed, err)
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}
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}
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res.Reloaded = true
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// 9. Janitor: prune backups beyond retention.
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retention := plan.BackupRetention
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if retention == 0 {
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retention = DefaultBackupRetention
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}
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if retention > 0 {
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for _, p := range preps {
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_ = pruneBackups(p.abs, retention)
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}
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}
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res.Duration = time.Since(start)
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return res, nil
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}
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// validatePlan rejects malformed plans before any I/O.
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func validatePlan(plan Plan) error {
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if len(plan.Files) == 0 {
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return fmt.Errorf("%w: no files", ErrPlanInvalid)
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}
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seen := make(map[string]struct{}, len(plan.Files))
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for i, f := range plan.Files {
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if f.Path == "" {
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return fmt.Errorf("%w: file %d has empty path", ErrPlanInvalid, i)
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}
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abs, err := filepath.Abs(f.Path)
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if err != nil {
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return fmt.Errorf("%w: file %d (%s): %v", ErrPlanInvalid, i, f.Path, err)
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}
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if _, dup := seen[abs]; dup {
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return fmt.Errorf("%w: duplicate destination %s", ErrPlanInvalid, abs)
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}
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seen[abs] = struct{}{}
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}
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return nil
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}
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// filePrep is the per-file working state for one Apply call.
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// Held by Apply's slice; passed to restoreFromBackups during
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// rollback.
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type filePrep struct {
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abs string
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file File
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tempPath string
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owner resolvedOwnership
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hadOrig bool
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backupTo string
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}
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// restoreFromBackups copies each prep's backup back into place.
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// Used during rollback (PostCommit failure or mid-loop rename
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// failure).
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func restoreFromBackups(preps []*filePrep) error {
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var firstErr error
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for _, p := range preps {
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if p.backupTo == "" {
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// File didn't exist before deploy — restore = remove.
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if err := os.Remove(p.abs); err != nil && !errors.Is(err, os.ErrNotExist) {
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if firstErr == nil {
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firstErr = err
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}
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}
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continue
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}
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// Read backup; atomically rewrite destination via the
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// same temp + rename dance so this restore is itself
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// atomic. We DON'T call AtomicWriteFile because we want
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// to skip the per-file mutex (we already hold it from
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// the outer Apply) and skip the backup-of-the-restore
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// (we don't want a backup chain explosion).
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bytes, err := os.ReadFile(p.backupTo)
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if err != nil {
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if firstErr == nil {
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firstErr = fmt.Errorf("read backup %s: %w", p.backupTo, err)
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}
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continue
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}
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tempPath, err := writeTempFile(p.abs, bytes)
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if err != nil {
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if firstErr == nil {
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firstErr = fmt.Errorf("write restore temp for %s: %w", p.abs, err)
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}
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continue
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}
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// Reapply original ownership (preserved from existing
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// stat at prep time).
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if err := applyOwnership(tempPath, p.owner); err != nil {
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_ = os.Remove(tempPath)
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if firstErr == nil {
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firstErr = fmt.Errorf("apply ownership during restore for %s: %w", p.abs, err)
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}
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continue
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}
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if err := os.Rename(tempPath, p.abs); err != nil {
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_ = os.Remove(tempPath)
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if firstErr == nil {
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firstErr = fmt.Errorf("rename during restore for %s: %w", p.abs, err)
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}
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continue
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}
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}
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return firstErr
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}
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// cleanupBackups removes a partial set of backups. Used when an
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// early backup step fails — we want to leave the destination
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// directory clean.
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func cleanupBackups(backupPaths map[string]string) {
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for _, bp := range backupPaths {
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if bp != "" {
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_ = os.Remove(bp)
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}
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}
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}
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@@ -0,0 +1,298 @@
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package deploy
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import (
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"context"
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"crypto/sha256"
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"sync"
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"time"
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)
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// fileMutexes serializes concurrent Apply / AtomicWriteFile calls
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// against the same destination path. Coarse-grained file-level lock
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// — sufficient for cert deploy throughput (operator-grade tens per
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// minute, not high-throughput).
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//
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// Per-target serialization (Phase 2) is a separate concern at the
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// agent dispatch layer; this file-level lock defends against
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// accidental same-path racing within a single connector pipeline.
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var fileMutexes sync.Map // map[string]*sync.Mutex
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func lockFile(path string) func() {
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abs, err := filepath.Abs(path)
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if err != nil {
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abs = path
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}
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v, _ := fileMutexes.LoadOrStore(abs, &sync.Mutex{})
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mu := v.(*sync.Mutex)
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mu.Lock()
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return mu.Unlock
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}
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// AtomicWriteFile writes data to path atomically.
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//
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// Algorithm:
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//
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// 1. Acquire the package-internal file-level mutex for path.
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// 2. SHA-256 short-circuit: if path exists and has identical bytes
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// and !opts.SkipIdempotent, return WriteResult{Idempotent: true}
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// with no I/O.
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// 3. Resolve final ownership (mode/uid/gid) per the precedence in
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// resolveOwnership.
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// 4. Write to <path>.certctl-tmp.<unix-nanos> in filepath.Dir(path)
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// (same-filesystem guarantees os.Rename atomicity).
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// 5. fsync the temp file (durability across power loss).
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// 6. Apply chmod / chown to the temp file BEFORE rename (so the
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// atomic-rename atomically swaps in a fully-permissioned file).
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// 7. Backup the existing destination to
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// <path>.certctl-bak.<unix-nanos> (skipped when destination did
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// not exist OR opts.BackupRetention == -1).
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// 8. os.Rename(temp, path) — atomic on POSIX same-filesystem.
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// 9. Janitor pass: prune backups beyond retention.
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//
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// Returns ErrPlanInvalid for malformed inputs (empty path, empty
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// data + nil-with-existing-file ambiguity is preserved — empty
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// data writes an empty file).
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func AtomicWriteFile(ctx context.Context, path string, data []byte, opts WriteOptions) (*WriteResult, error) {
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if path == "" {
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return nil, fmt.Errorf("%w: empty path", ErrPlanInvalid)
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}
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abs, err := filepath.Abs(path)
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if err != nil {
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return nil, fmt.Errorf("resolve path: %w", err)
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}
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unlock := lockFile(abs)
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defer unlock()
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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res := &WriteResult{Path: abs}
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// 2. Idempotency check.
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existingStat, statErr := os.Stat(abs)
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existed := statErr == nil
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if existed && !opts.SkipIdempotent {
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existingBytes, err := os.ReadFile(abs)
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if err == nil && sha256Eq(existingBytes, data) {
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res.Idempotent = true
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return res, nil
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}
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}
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// 3. Resolve ownership.
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||||
owner, err := resolveOwnership(File{
|
||||
Path: abs,
|
||||
Bytes: data,
|
||||
Mode: opts.Mode,
|
||||
Owner: opts.Owner,
|
||||
Group: opts.Group,
|
||||
}, FileDefaults{
|
||||
Mode: opts.DefaultMode,
|
||||
Owner: opts.DefaultOwner,
|
||||
Group: opts.DefaultGroup,
|
||||
}, ownershipStat(existingStat, statErr))
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("resolve ownership: %w", err)
|
||||
}
|
||||
|
||||
// 4. Write to temp in same dir.
|
||||
tempPath, err := writeTempFile(abs, data)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("write temp: %w", err)
|
||||
}
|
||||
tempCleanup := func() { _ = os.Remove(tempPath) }
|
||||
defer func() {
|
||||
// On any error path we want to remove the temp file. Successful
|
||||
// rename moves it away, so this remove is a no-op on success.
|
||||
// We don't care about the error from the cleanup.
|
||||
tempCleanup()
|
||||
}()
|
||||
|
||||
// 5. Apply ownership to temp BEFORE rename so the rename
|
||||
// atomically swaps in a properly-permissioned file (no
|
||||
// brief window where the destination has wrong perms).
|
||||
if err := applyOwnership(tempPath, owner); err != nil {
|
||||
return nil, fmt.Errorf("apply ownership to temp: %w", err)
|
||||
}
|
||||
|
||||
// 6. Backup existing destination.
|
||||
if existed && opts.BackupRetention != -1 {
|
||||
backupPath, err := backupFile(abs)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("backup existing: %w", err)
|
||||
}
|
||||
res.BackupPath = backupPath
|
||||
}
|
||||
|
||||
// 7. Atomic rename. On the rare case Rename fails after backup,
|
||||
// we leave the backup in place (operator can manually restore).
|
||||
if err := os.Rename(tempPath, abs); err != nil {
|
||||
return nil, fmt.Errorf("atomic rename: %w", err)
|
||||
}
|
||||
res.Replaced = existed
|
||||
|
||||
// 8. Janitor: prune backups beyond retention.
|
||||
retention := opts.BackupRetention
|
||||
if retention == 0 {
|
||||
retention = DefaultBackupRetention
|
||||
}
|
||||
if retention > 0 {
|
||||
if err := pruneBackups(abs, retention); err != nil {
|
||||
// Janitor errors are non-fatal — the deploy succeeded.
|
||||
// Surface only if the caller wired a logger somewhere
|
||||
// upstream. We choose to swallow and continue.
|
||||
_ = err
|
||||
}
|
||||
}
|
||||
|
||||
return res, nil
|
||||
}
|
||||
|
||||
// ownershipStat returns nil when the destination didn't exist,
|
||||
// otherwise the os.FileInfo. Encapsulates the existed/not-existed
|
||||
// branch so resolveOwnership's signature stays clean.
|
||||
func ownershipStat(fi os.FileInfo, statErr error) os.FileInfo {
|
||||
if statErr != nil {
|
||||
if errors.Is(statErr, os.ErrNotExist) {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return fi
|
||||
}
|
||||
|
||||
// writeTempFile writes data to <abs>.certctl-tmp.<unix-nanos> in
|
||||
// the same directory as abs. Returns the temp path. fsync's the
|
||||
// file before close to defend against power-loss-during-rename
|
||||
// corruption (rename guarantees atomic visibility but the file's
|
||||
// data blocks must be on disk first).
|
||||
func writeTempFile(abs string, data []byte) (string, error) {
|
||||
dir := filepath.Dir(abs)
|
||||
base := filepath.Base(abs)
|
||||
tempName := base + TempSuffix + nowNanosStr()
|
||||
tempPath := filepath.Join(dir, tempName)
|
||||
|
||||
// O_WRONLY|O_CREATE|O_EXCL guarantees we don't clobber a
|
||||
// half-written temp from a concurrent AtomicWriteFile call.
|
||||
// fileMutexes already serialize same-abs callers; O_EXCL is
|
||||
// belt-and-braces for the "wow, monotonic clock collided"
|
||||
// corner case.
|
||||
f, err := os.OpenFile(tempPath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
if _, err := f.Write(data); err != nil {
|
||||
_ = f.Close()
|
||||
_ = os.Remove(tempPath)
|
||||
return "", err
|
||||
}
|
||||
// fsync defends against power-loss between rename + data flush.
|
||||
// On POSIX, rename's atomicity is metadata-only — the new file's
|
||||
// data must be on disk first or a power-loss-then-recover sees
|
||||
// an empty file at the destination.
|
||||
if err := f.Sync(); err != nil {
|
||||
_ = f.Close()
|
||||
_ = os.Remove(tempPath)
|
||||
return "", err
|
||||
}
|
||||
if err := f.Close(); err != nil {
|
||||
_ = os.Remove(tempPath)
|
||||
return "", err
|
||||
}
|
||||
return tempPath, nil
|
||||
}
|
||||
|
||||
// backupFile copies abs's current bytes to
|
||||
// <abs>.certctl-bak.<unix-nanos>. Used by AtomicWriteFile as a
|
||||
// pre-write snapshot for rollback.
|
||||
func backupFile(abs string) (string, error) {
|
||||
src, err := os.ReadFile(abs)
|
||||
if err != nil {
|
||||
return "", fmt.Errorf("read for backup: %w", err)
|
||||
}
|
||||
srcStat, err := os.Stat(abs)
|
||||
if err != nil {
|
||||
return "", fmt.Errorf("stat for backup: %w", err)
|
||||
}
|
||||
dir := filepath.Dir(abs)
|
||||
base := filepath.Base(abs)
|
||||
backupName := base + BackupSuffix + nowNanosStr()
|
||||
backupPath := filepath.Join(dir, backupName)
|
||||
if err := os.WriteFile(backupPath, src, srcStat.Mode().Perm()); err != nil {
|
||||
return "", fmt.Errorf("write backup: %w", err)
|
||||
}
|
||||
// Best-effort: preserve uid/gid of the original. The backup is
|
||||
// for emergency restore; if we can't chown (non-root + chown
|
||||
// denied), the operator can still cat/diff it as the agent user.
|
||||
if uid, gid, ok := unixOwnerFromStat(srcStat); ok {
|
||||
_ = os.Chown(backupPath, uid, gid)
|
||||
}
|
||||
return backupPath, nil
|
||||
}
|
||||
|
||||
// pruneBackups deletes older backups for abs, keeping the most
|
||||
// recent `keep` entries. Sorted lexicographically — which is also
|
||||
// chronological because nowNanosStr is monotonic-ish.
|
||||
func pruneBackups(abs string, keep int) error {
|
||||
if keep <= 0 {
|
||||
return nil
|
||||
}
|
||||
dir := filepath.Dir(abs)
|
||||
base := filepath.Base(abs)
|
||||
prefix := base + BackupSuffix
|
||||
entries, err := os.ReadDir(dir)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
var matches []string
|
||||
for _, e := range entries {
|
||||
if e.IsDir() {
|
||||
continue
|
||||
}
|
||||
if strings.HasPrefix(e.Name(), prefix) {
|
||||
matches = append(matches, e.Name())
|
||||
}
|
||||
}
|
||||
if len(matches) <= keep {
|
||||
return nil
|
||||
}
|
||||
sort.Strings(matches)
|
||||
// Older ones come first; trim to keep the last `keep`.
|
||||
toRemove := matches[:len(matches)-keep]
|
||||
var firstErr error
|
||||
for _, name := range toRemove {
|
||||
if err := os.Remove(filepath.Join(dir, name)); err != nil && firstErr == nil {
|
||||
firstErr = err
|
||||
}
|
||||
}
|
||||
return firstErr
|
||||
}
|
||||
|
||||
// sha256Eq returns true when two byte slices have identical
|
||||
// SHA-256 hashes. We compute both side hashes (rather than
|
||||
// bytes.Equal directly) because the call sites typically already
|
||||
// have a "hash for the wire" need elsewhere — keeping the same
|
||||
// primitive everywhere makes future audit-log entries consistent.
|
||||
func sha256Eq(a, b []byte) bool {
|
||||
if len(a) != len(b) {
|
||||
return false
|
||||
}
|
||||
ha := sha256.Sum256(a)
|
||||
hb := sha256.Sum256(b)
|
||||
return ha == hb
|
||||
}
|
||||
|
||||
// nowNanosStr returns time.Now().UnixNano() formatted as a
|
||||
// fixed-width zero-padded decimal so lexicographic sort matches
|
||||
// chronological order. The padding matters for pruneBackups —
|
||||
// without it, "100" would sort before "99".
|
||||
func nowNanosStr() string {
|
||||
return fmt.Sprintf("%019d", time.Now().UnixNano())
|
||||
}
|
||||
@@ -0,0 +1,523 @@
|
||||
package deploy
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"sync/atomic"
|
||||
"testing"
|
||||
)
|
||||
|
||||
// Coverage uplift tests for Phase 1. These pin the error paths
|
||||
// exercised in production but rare in the happy-path flow:
|
||||
// - restoreFromBackups: file-didn't-exist-before deploy →
|
||||
// rollback removes the new file (vs restoring bytes)
|
||||
// - cleanupBackups: partial backup cleanup on early failure
|
||||
// - writeTempFile: dir-creation race / O_EXCL collision
|
||||
// - applyOwnership: chmod error / chown skipped when uid=-1
|
||||
// - lookupUID/lookupGID: empty-string and unresolvable cases
|
||||
// - unixOwnerFromStat: nil safety
|
||||
// - Apply: ownership-resolution failure midway through prep
|
||||
|
||||
// TestApply_NewFileRollback_RemovesFile pins the
|
||||
// no-backup-because-no-original case during PostCommit failure:
|
||||
// the rollback removes the file rather than restoring (since
|
||||
// there was nothing to restore).
|
||||
func TestApply_NewFileRollback_RemovesFile(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "fresh.crt")
|
||||
|
||||
postCalls := 0
|
||||
plan := Plan{
|
||||
Files: []File{{Path: cert, Bytes: []byte(testCert1)}},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
postCalls++
|
||||
if postCalls == 1 {
|
||||
return errors.New("nginx exited 1")
|
||||
}
|
||||
return nil
|
||||
},
|
||||
}
|
||||
res, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrReloadFailed) {
|
||||
t.Fatalf("expected ErrReloadFailed, got %v", err)
|
||||
}
|
||||
if !res.RolledBack {
|
||||
t.Error("expected RolledBack=true")
|
||||
}
|
||||
// The file should no longer exist (rollback removed it
|
||||
// because there was no backup to restore from).
|
||||
if _, statErr := os.Stat(cert); statErr == nil {
|
||||
t.Error("file still exists after rollback of new-file deploy")
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_BackupReadFails_RollbackEscalates triggers the
|
||||
// restoreFromBackups error path by deleting the backup before
|
||||
// PostCommit fires (simulates an aggressive operator-side
|
||||
// janitor).
|
||||
func TestApply_BackupReadFails_RollbackEscalates(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
var capturedBackup atomic.Value // string
|
||||
plan := Plan{
|
||||
Files: []File{{Path: cert, Bytes: []byte(testCert1)}},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
// Steal the backup BEFORE rollback runs. We have to
|
||||
// find it via directory glob since Result isn't
|
||||
// available yet.
|
||||
entries, _ := os.ReadDir(dir)
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), BackupSuffix) {
|
||||
capturedBackup.Store(filepath.Join(dir, e.Name()))
|
||||
_ = os.Remove(filepath.Join(dir, e.Name()))
|
||||
break
|
||||
}
|
||||
}
|
||||
return errors.New("nginx exited 1")
|
||||
},
|
||||
}
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrRollbackFailed) {
|
||||
t.Fatalf("expected ErrRollbackFailed, got %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_RenameMidLoopFails simulates a mid-loop rename
|
||||
// failure by making the second destination's parent directory
|
||||
// disappear after writeTempFile but before rename. We do this by
|
||||
// using two destinations + removing the second's parent during
|
||||
// PreCommit.
|
||||
func TestApply_RenameMidLoopFails_PartialRollback(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
subA := filepath.Join(dir, "a")
|
||||
subB := filepath.Join(dir, "b")
|
||||
if err := os.MkdirAll(subA, 0755); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := os.MkdirAll(subB, 0755); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
pathA := filepath.Join(subA, "tls.crt")
|
||||
pathB := filepath.Join(subB, "tls.crt")
|
||||
if err := os.WriteFile(pathA, []byte("ORIG-A"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := os.WriteFile(pathB, []byte("ORIG-B"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: pathA, Bytes: []byte(testCert1)},
|
||||
{Path: pathB, Bytes: []byte(testCert2)},
|
||||
},
|
||||
PreCommit: func(ctx context.Context, tempPaths map[string]string) error {
|
||||
// After temps are written + ownership applied,
|
||||
// remove the SECOND temp file so its rename fails.
|
||||
// The first will succeed (rename pathA's temp
|
||||
// → pathA), then the loop will fail at pathB
|
||||
// triggering the partial-rollback restore.
|
||||
tempB := tempPaths[pathB]
|
||||
_ = os.Remove(tempB)
|
||||
return nil
|
||||
},
|
||||
}
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if err == nil {
|
||||
t.Fatal("expected mid-loop rename failure")
|
||||
}
|
||||
// pathA should be restored to ORIG-A (rollback ran).
|
||||
if got, _ := os.ReadFile(pathA); string(got) != "ORIG-A" {
|
||||
t.Errorf("pathA = %q, want ORIG-A (partial rollback restore)", got)
|
||||
}
|
||||
}
|
||||
|
||||
// TestCleanupBackups_RemovesGivenSet — directly exercise the
|
||||
// cleanupBackups helper. Used internally on backup-step failure;
|
||||
// usually unreachable through the public API.
|
||||
func TestCleanupBackups_RemovesGivenSet(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
bp := filepath.Join(dir, "x"+BackupSuffix+"00000000")
|
||||
if err := os.WriteFile(bp, []byte("backup data"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
cleanupBackups(map[string]string{
|
||||
"/some/path": bp,
|
||||
"/other": "", // empty entries should be ignored
|
||||
})
|
||||
if _, err := os.Stat(bp); err == nil {
|
||||
t.Error("backup not removed by cleanupBackups")
|
||||
}
|
||||
}
|
||||
|
||||
// TestApplyOwnership_ChmodSkippedWhenModeNotSet verifies the
|
||||
// branch where ModeSet is false (no chmod attempted).
|
||||
func TestApplyOwnership_ChmodSkippedWhenModeNotSet(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
if err := os.WriteFile(path, []byte("x"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
res := resolvedOwnership{UID: -1, GID: -1, ModeSet: false}
|
||||
if err := applyOwnership(path, res); err != nil {
|
||||
t.Fatalf("applyOwnership: %v", err)
|
||||
}
|
||||
// File mode unchanged.
|
||||
stat, _ := os.Stat(path)
|
||||
if stat.Mode().Perm() != 0644 {
|
||||
t.Errorf("mode = %#o, want 0644", stat.Mode().Perm())
|
||||
}
|
||||
}
|
||||
|
||||
// TestApplyOwnership_ChmodOnNonexistentFile returns the wrapped
|
||||
// chmod error.
|
||||
func TestApplyOwnership_ChmodOnNonexistentFile(t *testing.T) {
|
||||
res := resolvedOwnership{Mode: 0644, ModeSet: true, UID: -1, GID: -1}
|
||||
err := applyOwnership("/nonexistent/path/to/nothing", res)
|
||||
if err == nil {
|
||||
t.Fatal("expected error chmodding nonexistent file")
|
||||
}
|
||||
if !strings.Contains(err.Error(), "chmod") {
|
||||
t.Errorf("error not labeled chmod: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestLookupUID_Empty + Unresolvable pin both error legs.
|
||||
func TestLookupUID_ErrorLegs(t *testing.T) {
|
||||
if _, err := lookupUID(""); err == nil {
|
||||
t.Error("empty username should error")
|
||||
}
|
||||
if _, err := lookupUID("nonexistent-user-xyz-test-12345"); err == nil {
|
||||
t.Error("unresolvable user should error")
|
||||
}
|
||||
}
|
||||
|
||||
func TestLookupGID_ErrorLegs(t *testing.T) {
|
||||
if _, err := lookupGID(""); err == nil {
|
||||
t.Error("empty groupname should error")
|
||||
}
|
||||
if _, err := lookupGID("nonexistent-group-xyz-test-12345"); err == nil {
|
||||
t.Error("unresolvable group should error")
|
||||
}
|
||||
}
|
||||
|
||||
// TestUnixOwnerFromStat_NilFileInfo pins the nil safety.
|
||||
func TestUnixOwnerFromStat_NilFileInfo(t *testing.T) {
|
||||
uid, gid, ok := unixOwnerFromStat(nil)
|
||||
if ok {
|
||||
t.Errorf("ok=true for nil FileInfo (uid=%d, gid=%d)", uid, gid)
|
||||
}
|
||||
if uid != -1 || gid != -1 {
|
||||
t.Errorf("uid/gid = %d/%d, want -1/-1", uid, gid)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_ResolveOwnershipError_AbortsBeforeAnyWrite triggers
|
||||
// the resolveOwnership-fails branch (unresolvable owner string).
|
||||
// No live files should be modified.
|
||||
func TestApply_ResolveOwnershipError_AbortsBeforeAnyWrite(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
plan := Plan{
|
||||
Files: []File{{
|
||||
Path: cert,
|
||||
Bytes: []byte(testCert1),
|
||||
Owner: "nonexistent-user-xyz-12345",
|
||||
Group: "nonexistent-group-xyz-12345",
|
||||
}},
|
||||
}
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if err == nil {
|
||||
t.Fatal("expected error from unresolvable owner")
|
||||
}
|
||||
// File untouched.
|
||||
if got, _ := os.ReadFile(cert); string(got) != "ORIGINAL" {
|
||||
t.Errorf("file modified despite ownership-resolution failure: %q", got)
|
||||
}
|
||||
}
|
||||
|
||||
// TestPruneBackups_BadDirectory pins the early error path.
|
||||
func TestPruneBackups_BadDirectory(t *testing.T) {
|
||||
err := pruneBackups("/nonexistent-parent-xyz/file", 3)
|
||||
if err == nil {
|
||||
t.Error("expected error reading nonexistent dir")
|
||||
}
|
||||
}
|
||||
|
||||
// TestPruneBackups_KeepZeroOrNegative_NoOp pins the early-return
|
||||
// branch.
|
||||
func TestPruneBackups_KeepZeroOrNegative_NoOp(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
abs := filepath.Join(dir, "f")
|
||||
bp := abs + BackupSuffix + "00001"
|
||||
if err := os.WriteFile(bp, []byte("x"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := pruneBackups(abs, 0); err != nil {
|
||||
t.Errorf("keep=0 error: %v", err)
|
||||
}
|
||||
if err := pruneBackups(abs, -1); err != nil {
|
||||
t.Errorf("keep=-1 error: %v", err)
|
||||
}
|
||||
// Backup still exists.
|
||||
if _, err := os.Stat(bp); err != nil {
|
||||
t.Error("backup deleted under non-pruning retention")
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_BadOwnership exercises the
|
||||
// resolveOwnership error path within the lower-level entry.
|
||||
func TestAtomicWriteFile_BadOwnership(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
_, err := AtomicWriteFile(context.Background(), path, []byte("x"), WriteOptions{
|
||||
Owner: "nonexistent-user-xyz-12345",
|
||||
Group: "nonexistent-group-xyz-12345",
|
||||
})
|
||||
if err == nil {
|
||||
t.Error("expected error from bad ownership")
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_ContextCancelled before lock acquisition.
|
||||
func TestAtomicWriteFile_ContextCancelled(t *testing.T) {
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
cancel()
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
_, err := AtomicWriteFile(ctx, path, []byte("x"), WriteOptions{})
|
||||
if !errors.Is(err, context.Canceled) {
|
||||
t.Errorf("got %v, want context.Canceled", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestWriteTempFile_BadDir verifies the open-file error path.
|
||||
func TestWriteTempFile_BadDir(t *testing.T) {
|
||||
_, err := writeTempFile("/nonexistent-parent-xyz/file", []byte("x"))
|
||||
if err == nil {
|
||||
t.Error("expected error writing into nonexistent parent")
|
||||
}
|
||||
}
|
||||
|
||||
// TestBackupFile_NonexistentSource pins the read-error path.
|
||||
func TestBackupFile_NonexistentSource(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
_, err := backupFile(filepath.Join(dir, "does-not-exist"))
|
||||
if err == nil {
|
||||
t.Error("expected error backing up nonexistent file")
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_SkipIdempotent_SecondPathExists_FirstNew exercises
|
||||
// the partial-match branch where one file matches and one doesn't.
|
||||
// Since not ALL match, the deploy proceeds normally for both.
|
||||
func TestApply_PartialIdempotency_DeploysAll(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
a := filepath.Join(dir, "a.crt")
|
||||
b := filepath.Join(dir, "b.crt")
|
||||
if err := os.WriteFile(a, []byte(testCert1), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
// b doesn't exist yet — partial match.
|
||||
|
||||
preCalls := 0
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: a, Bytes: []byte(testCert1)},
|
||||
{Path: b, Bytes: []byte(testCert2)},
|
||||
},
|
||||
PreCommit: func(ctx context.Context, _ map[string]string) error {
|
||||
preCalls++
|
||||
return nil
|
||||
},
|
||||
}
|
||||
res, err := Apply(context.Background(), plan)
|
||||
if err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
if res.SkippedAsIdempotent {
|
||||
t.Error("partial match should not skip")
|
||||
}
|
||||
if preCalls != 1 {
|
||||
t.Errorf("PreCommit calls = %d, want 1", preCalls)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_FilePathInvalidAbs covers the filepath.Abs error
|
||||
// branch. Hard to trigger on most platforms; the validation
|
||||
// catches the empty case which IS triggerable.
|
||||
func TestApply_FilePathEmpty_RejectedEarly(t *testing.T) {
|
||||
plan := Plan{
|
||||
Files: []File{{Path: "", Bytes: []byte("x")}},
|
||||
}
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrPlanInvalid) {
|
||||
t.Errorf("got %v, want ErrPlanInvalid", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestLockFile_RelativePathFallback covers the filepath.Abs
|
||||
// failure-fallback branch in lockFile by acquiring + releasing
|
||||
// a relative path lock.
|
||||
func TestLockFile_RelativePath(t *testing.T) {
|
||||
unlock := lockFile("relative/path/test")
|
||||
unlock()
|
||||
// Reacquiring should succeed (mutex released).
|
||||
unlock = lockFile("relative/path/test")
|
||||
unlock()
|
||||
}
|
||||
|
||||
// TestApply_NowNanosStr_FormatStable double-checks the
|
||||
// lex-sortable format used by pruneBackups for chronological
|
||||
// ordering.
|
||||
func TestNowNanosStr_FormatStable(t *testing.T) {
|
||||
a := nowNanosStr()
|
||||
if len(a) != 19 {
|
||||
t.Errorf("len = %d, want 19 (zero-padded for sort)", len(a))
|
||||
}
|
||||
for _, c := range a {
|
||||
if c < '0' || c > '9' {
|
||||
t.Errorf("non-digit in nano string: %c", c)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_RestoreFails_RenameAfterChmodReadOnly triggers the
|
||||
// "rename during restore fails" branch by chmodding the parent
|
||||
// directory to read-only AFTER the temp file is renamed in but
|
||||
// BEFORE PostCommit fires (so the rollback's restore-rename
|
||||
// fails). This tests the deepest leg of restoreFromBackups.
|
||||
func TestApply_RestoreFails_RenameAfterChmodReadOnly(t *testing.T) {
|
||||
if os.Getuid() == 0 {
|
||||
t.Skip("read-only chmod doesn't restrict root")
|
||||
}
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer func() {
|
||||
// Ensure cleanup can proceed.
|
||||
_ = os.Chmod(dir, 0755)
|
||||
}()
|
||||
|
||||
plan := Plan{
|
||||
Files: []File{{Path: cert, Bytes: []byte(testCert1)}},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
// Make the directory read-only so the subsequent
|
||||
// restore-rename will fail.
|
||||
_ = os.Chmod(dir, 0555)
|
||||
return errors.New("nginx exited 1")
|
||||
},
|
||||
}
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if err == nil {
|
||||
t.Fatal("expected error")
|
||||
}
|
||||
// Either ErrReloadFailed (rollback succeeded somehow) or
|
||||
// ErrRollbackFailed (rollback couldn't restore due to RO).
|
||||
if !errors.Is(err, ErrReloadFailed) && !errors.Is(err, ErrRollbackFailed) {
|
||||
t.Errorf("got %v, want ErrReloadFailed or ErrRollbackFailed", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_DuplicateNormalisedPath catches the validatePlan
|
||||
// duplicate detection after filepath.Abs normalisation.
|
||||
func TestApply_DuplicateNormalisedPath(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
a := filepath.Join(dir, "x.crt")
|
||||
// Same logical destination via a relative + absolute mix.
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: a, Bytes: []byte("a")},
|
||||
{Path: a, Bytes: []byte("b")},
|
||||
},
|
||||
}
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrPlanInvalid) {
|
||||
t.Errorf("got %v, want ErrPlanInvalid", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestUnixOwnerFromStat_LiveStat covers the happy path with a
|
||||
// real os.Stat result.
|
||||
func TestUnixOwnerFromStat_LiveStat(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
if err := os.WriteFile(path, []byte("x"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
stat, err := os.Stat(path)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
uid, gid, ok := unixOwnerFromStat(stat)
|
||||
if !ok {
|
||||
t.Skip("non-unix")
|
||||
}
|
||||
if uid != os.Getuid() || gid != os.Getgid() {
|
||||
t.Errorf("uid/gid = %d/%d, want %d/%d", uid, gid, os.Getuid(), os.Getgid())
|
||||
}
|
||||
}
|
||||
|
||||
// TestBackupFile_StatFailsAfterRead triggers the rare
|
||||
// "file deleted between read and stat" race-window branch in
|
||||
// backupFile by using a path that disappears mid-call. We can't
|
||||
// easily race it, but we can show the read-then-stat ordering by
|
||||
// checking that backupFile of a missing file errors at read.
|
||||
// Already covered by TestBackupFile_NonexistentSource above; this
|
||||
// is a placeholder so the package's race-aware code path is
|
||||
// documented.
|
||||
func TestBackupFile_RaceWindow_DocumentedInCode(t *testing.T) {
|
||||
t.Log("backupFile race window between read+stat is documented but not faulttested without fault injection")
|
||||
}
|
||||
|
||||
// TestWriteTempFile_OEXCLContention pins the O_EXCL belt-and-
|
||||
// braces protection in writeTempFile. Hard to trigger externally
|
||||
// because nowNanosStr() is monotonic; we exercise the protection
|
||||
// by pre-creating a file at the temp path and checking that a
|
||||
// second write to the same nanos collides + errors. This requires
|
||||
// freezing the clock — skipped (impractical) — but the test
|
||||
// documents the existence of the protection.
|
||||
func TestWriteTempFile_OEXCLContention_DocumentedInCode(t *testing.T) {
|
||||
t.Log("O_EXCL collision branch defends against clock collision; not test-injectable without time mock")
|
||||
}
|
||||
|
||||
// TestApply_BackupRetentionDefault verifies the default-of-3
|
||||
// behavior when BackupRetention is left zero.
|
||||
func TestApply_BackupRetentionDefault(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("V0"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
for i := 1; i <= 6; i++ {
|
||||
plan := Plan{
|
||||
Files: []File{{Path: cert, Bytes: []byte(fmt.Sprintf("V%d", i))}},
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Fatalf("Apply iter %d: %v", i, err)
|
||||
}
|
||||
}
|
||||
entries, _ := os.ReadDir(dir)
|
||||
count := 0
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), BackupSuffix) {
|
||||
count++
|
||||
}
|
||||
}
|
||||
if count != DefaultBackupRetention {
|
||||
t.Errorf("backup count = %d, want %d (default)", count, DefaultBackupRetention)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,820 @@
|
||||
package deploy
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"os"
|
||||
"os/user"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"sync"
|
||||
"sync/atomic"
|
||||
"testing"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Phase 1 of the deploy-hardening I master bundle. The 12 named
|
||||
// tests below pin the load-bearing invariants of the
|
||||
// internal/deploy/ package: atomic-or-nothing across files,
|
||||
// validate-fail-cleans-up, reload-fail-rolls-back,
|
||||
// rollback-also-fails-escalates, SHA-256 idempotency,
|
||||
// owner/mode preservation + override, file-level serialization,
|
||||
// backup retention janitor, and AtomicWriteFile temp-file +
|
||||
// rename-race correctness.
|
||||
//
|
||||
// All 12 are required by the prompt at
|
||||
// cowork/deploy-hardening-i-prompt.md::"Test plan (Phase 1
|
||||
// ships ≥95% coverage on the new package)".
|
||||
//
|
||||
// The tests run in non-root environments — they do NOT exercise
|
||||
// cross-user chown (which requires CAP_CHOWN). The chown wiring
|
||||
// is exercised via the same-user case (chown to os.Getuid()
|
||||
// always succeeds) + the resolveOwnership white-box tests.
|
||||
|
||||
const testCert1 = "-----BEGIN CERTIFICATE-----\nFAKE-CERT-1-PAYLOAD\n-----END CERTIFICATE-----\n"
|
||||
const testCert2 = "-----BEGIN CERTIFICATE-----\nFAKE-CERT-2-DIFFERENT\n-----END CERTIFICATE-----\n"
|
||||
|
||||
// TestApply_HappyPath_PreCommitSucceeds_PostCommitSucceeds_FilesAtomic
|
||||
// pins the canonical happy path: write multiple files, validate
|
||||
// passes, all atomic-rename, reload passes. Every File ends up
|
||||
// with the new bytes; PreCommit + PostCommit each fired once.
|
||||
func TestApply_HappyPath_PreCommitSucceeds_PostCommitSucceeds_FilesAtomic(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
key := filepath.Join(dir, "tls.key")
|
||||
|
||||
preCalls, postCalls := 0, 0
|
||||
var seenTempPaths map[string]string
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)},
|
||||
{Path: key, Bytes: []byte(testCert2)},
|
||||
},
|
||||
PreCommit: func(ctx context.Context, tempPaths map[string]string) error {
|
||||
preCalls++
|
||||
seenTempPaths = tempPaths
|
||||
// Both temp files exist + readable + carry the new
|
||||
// bytes (the load-bearing invariant for "validate-
|
||||
// against-temp" semantics).
|
||||
for finalPath, tempPath := range tempPaths {
|
||||
if _, err := os.Stat(tempPath); err != nil {
|
||||
return fmt.Errorf("temp for %s missing: %w", finalPath, err)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
postCalls++
|
||||
return nil
|
||||
},
|
||||
}
|
||||
|
||||
res, err := Apply(context.Background(), plan)
|
||||
if err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
if res.SkippedAsIdempotent {
|
||||
t.Errorf("expected fresh write, got idempotent skip")
|
||||
}
|
||||
if !res.ValidateOK || !res.Reloaded {
|
||||
t.Errorf("ValidateOK=%v Reloaded=%v, want true/true", res.ValidateOK, res.Reloaded)
|
||||
}
|
||||
if preCalls != 1 || postCalls != 1 {
|
||||
t.Errorf("PreCommit/PostCommit calls = %d/%d, want 1/1", preCalls, postCalls)
|
||||
}
|
||||
if len(seenTempPaths) != 2 {
|
||||
t.Errorf("PreCommit saw %d temp paths, want 2", len(seenTempPaths))
|
||||
}
|
||||
// Final files have new bytes.
|
||||
if got, _ := os.ReadFile(cert); string(got) != testCert1 {
|
||||
t.Errorf("cert content = %q, want %q", got, testCert1)
|
||||
}
|
||||
if got, _ := os.ReadFile(key); string(got) != testCert2 {
|
||||
t.Errorf("key content = %q, want %q", got, testCert2)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_PreCommitFails_NoFilesChanged pins the all-or-nothing
|
||||
// invariant on the validate path: PreCommit returns an error →
|
||||
// neither destination is touched, ErrValidateFailed is returned.
|
||||
func TestApply_PreCommitFails_NoFilesChanged(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
key := filepath.Join(dir, "tls.key")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL-CERT"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := os.WriteFile(key, []byte("ORIGINAL-KEY"), 0600); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
postCalls := 0
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)},
|
||||
{Path: key, Bytes: []byte(testCert2)},
|
||||
},
|
||||
PreCommit: func(ctx context.Context, tempPaths map[string]string) error {
|
||||
return errors.New("nginx -t says: invalid SAN")
|
||||
},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
postCalls++
|
||||
return nil
|
||||
},
|
||||
}
|
||||
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrValidateFailed) {
|
||||
t.Fatalf("expected ErrValidateFailed, got %v", err)
|
||||
}
|
||||
if postCalls != 0 {
|
||||
t.Errorf("PostCommit called %d times after PreCommit failure, want 0", postCalls)
|
||||
}
|
||||
// Both destinations untouched.
|
||||
if got, _ := os.ReadFile(cert); string(got) != "ORIGINAL-CERT" {
|
||||
t.Errorf("cert was modified despite PreCommit failure: %q", got)
|
||||
}
|
||||
if got, _ := os.ReadFile(key); string(got) != "ORIGINAL-KEY" {
|
||||
t.Errorf("key was modified despite PreCommit failure: %q", got)
|
||||
}
|
||||
// No temp files leaked.
|
||||
entries, _ := os.ReadDir(dir)
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), TempSuffix) {
|
||||
t.Errorf("temp file leaked: %s", e.Name())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_PostCommitFails_FilesRolledBack pins the rollback
|
||||
// wire: PostCommit fails → restore from backup → re-call
|
||||
// PostCommit → second one succeeds → return ErrReloadFailed +
|
||||
// RolledBack=true. The destinations now hold the ORIGINAL bytes.
|
||||
func TestApply_PostCommitFails_FilesRolledBack(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
postCalls := 0
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)},
|
||||
},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
postCalls++
|
||||
if postCalls == 1 {
|
||||
return errors.New("nginx -s reload exited 1")
|
||||
}
|
||||
return nil
|
||||
},
|
||||
}
|
||||
|
||||
res, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrReloadFailed) {
|
||||
t.Fatalf("expected ErrReloadFailed, got %v", err)
|
||||
}
|
||||
if !res.RolledBack {
|
||||
t.Error("expected RolledBack=true")
|
||||
}
|
||||
if res.Reloaded {
|
||||
t.Error("expected Reloaded=false after rollback")
|
||||
}
|
||||
if postCalls != 2 {
|
||||
t.Errorf("PostCommit calls = %d, want 2 (once for the new bytes, once for the restored bytes)", postCalls)
|
||||
}
|
||||
if got, _ := os.ReadFile(cert); string(got) != "ORIGINAL" {
|
||||
t.Errorf("cert after rollback = %q, want %q", got, "ORIGINAL")
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_RollbackAlsoFails_ReturnsErrRollbackFailed is the
|
||||
// escalation path: PostCommit fails + the second PostCommit (after
|
||||
// restore) also fails. ErrRollbackFailed surfaces;
|
||||
// operator-actionable.
|
||||
func TestApply_RollbackAlsoFails_ReturnsErrRollbackFailed(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)},
|
||||
},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
return errors.New("nginx is wedged")
|
||||
},
|
||||
}
|
||||
|
||||
_, err := Apply(context.Background(), plan)
|
||||
if !errors.Is(err, ErrRollbackFailed) {
|
||||
t.Fatalf("expected ErrRollbackFailed, got %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_IdempotentSkip_SHA256Match pins the idempotency
|
||||
// short-circuit: when every File's destination already matches
|
||||
// SHA-256, neither PreCommit nor PostCommit fires; the result
|
||||
// reports SkippedAsIdempotent=true.
|
||||
func TestApply_IdempotentSkip_SHA256Match(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte(testCert1), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
preCalls, postCalls := 0, 0
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)},
|
||||
},
|
||||
PreCommit: func(ctx context.Context, _ map[string]string) error {
|
||||
preCalls++
|
||||
return nil
|
||||
},
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
postCalls++
|
||||
return nil
|
||||
},
|
||||
}
|
||||
res, err := Apply(context.Background(), plan)
|
||||
if err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
if !res.SkippedAsIdempotent {
|
||||
t.Error("expected SkippedAsIdempotent=true")
|
||||
}
|
||||
if preCalls != 0 || postCalls != 0 {
|
||||
t.Errorf("expected no Pre/PostCommit calls, got %d/%d", preCalls, postCalls)
|
||||
}
|
||||
if len(res.BackupPaths) != 0 {
|
||||
t.Errorf("expected zero backups for idempotent skip, got %d", len(res.BackupPaths))
|
||||
}
|
||||
|
||||
// Verify SkipIdempotent forces the calls.
|
||||
plan.SkipIdempotent = true
|
||||
res, err = Apply(context.Background(), plan)
|
||||
if err != nil {
|
||||
t.Fatalf("Apply with SkipIdempotent: %v", err)
|
||||
}
|
||||
if res.SkippedAsIdempotent {
|
||||
t.Error("expected SkipIdempotent override to force the deploy")
|
||||
}
|
||||
if preCalls != 1 || postCalls != 1 {
|
||||
t.Errorf("expected 1/1 calls under SkipIdempotent, got %d/%d", preCalls, postCalls)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_PreservesExistingOwnerAndMode_WhenNotOverridden pins
|
||||
// the silent-failure-mode-defense: an existing nginx:nginx 0640
|
||||
// file MUST stay nginx:nginx 0640 across a renewal, NOT get
|
||||
// clobbered to root:root 0600.
|
||||
//
|
||||
// We can't actually create a non-current-user file in a non-root
|
||||
// test, so this test verifies mode preservation only (the chown
|
||||
// preservation is exercised by the resolveOwnership unit test
|
||||
// below).
|
||||
func TestApply_PreservesExistingOwnerAndMode_WhenNotOverridden(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
// Pre-existing file with very specific mode.
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0640); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
// Some umasks downgrade 0640 → 0620; force the desired bits
|
||||
// after creation.
|
||||
if err := os.Chmod(cert, 0640); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)}, // no Mode/Owner/Group set
|
||||
},
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
stat, err := os.Stat(cert)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if stat.Mode().Perm() != 0640 {
|
||||
t.Errorf("mode after deploy = %#o, want %#o (preservation broken)", stat.Mode().Perm(), os.FileMode(0640))
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_RespectsOverrides_OwnerGroupMode pins the override
|
||||
// path: when File.Mode is set, the existing mode is overridden.
|
||||
// We use the current user/group so chown succeeds on non-root.
|
||||
func TestApply_RespectsOverrides_OwnerGroupMode(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0640); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := os.Chmod(cert, 0640); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
currentUser, err := user.Current()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
currentGroup, err := user.LookupGroupId(currentUser.Gid)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
plan := Plan{
|
||||
Files: []File{{
|
||||
Path: cert,
|
||||
Bytes: []byte(testCert1),
|
||||
Mode: 0644,
|
||||
Owner: currentUser.Username,
|
||||
Group: currentGroup.Name,
|
||||
}},
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
stat, err := os.Stat(cert)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if stat.Mode().Perm() != 0644 {
|
||||
t.Errorf("override mode = %#o, want 0644", stat.Mode().Perm())
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_ConcurrentApplyToSameFile_Serializes pins the
|
||||
// file-level mutex: 10 concurrent Applies to the same destination
|
||||
// see exactly 10 PostCommit invocations and the file ends with
|
||||
// one of the writers' bytes (no torn write).
|
||||
func TestApply_ConcurrentApplyToSameFile_Serializes(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
|
||||
const N = 10
|
||||
var inFlight, maxInFlight int32
|
||||
var postCount int32
|
||||
var wg sync.WaitGroup
|
||||
for i := 0; i < N; i++ {
|
||||
wg.Add(1)
|
||||
go func(idx int) {
|
||||
defer wg.Done()
|
||||
plan := Plan{
|
||||
Files: []File{{
|
||||
Path: cert,
|
||||
Bytes: []byte(fmt.Sprintf("WRITER-%d", idx)),
|
||||
}},
|
||||
SkipIdempotent: true, // force every call through the full path
|
||||
PostCommit: func(ctx context.Context) error {
|
||||
n := atomic.AddInt32(&inFlight, 1)
|
||||
for {
|
||||
m := atomic.LoadInt32(&maxInFlight)
|
||||
if n <= m || atomic.CompareAndSwapInt32(&maxInFlight, m, n) {
|
||||
break
|
||||
}
|
||||
}
|
||||
time.Sleep(2 * time.Millisecond)
|
||||
atomic.AddInt32(&inFlight, -1)
|
||||
atomic.AddInt32(&postCount, 1)
|
||||
return nil
|
||||
},
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Errorf("Apply: %v", err)
|
||||
}
|
||||
}(i)
|
||||
}
|
||||
wg.Wait()
|
||||
|
||||
if postCount != N {
|
||||
t.Errorf("postCount = %d, want %d", postCount, N)
|
||||
}
|
||||
if maxInFlight > 1 {
|
||||
t.Errorf("max concurrent PostCommit = %d, want 1 (serialization broken)", maxInFlight)
|
||||
}
|
||||
// File must contain exactly one of the writers' contents.
|
||||
got, _ := os.ReadFile(cert)
|
||||
if !strings.HasPrefix(string(got), "WRITER-") {
|
||||
t.Errorf("file content not from any writer: %q", got)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_BackupRetention_KeepsLastN pins the janitor: after
|
||||
// many deploys, only the last N backups remain.
|
||||
func TestApply_BackupRetention_KeepsLastN(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
|
||||
// Initial file.
|
||||
if err := os.WriteFile(cert, []byte("V0"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
const keep = 2
|
||||
for i := 1; i <= 5; i++ {
|
||||
plan := Plan{
|
||||
Files: []File{{
|
||||
Path: cert,
|
||||
Bytes: []byte(fmt.Sprintf("V%d", i)),
|
||||
}},
|
||||
BackupRetention: keep,
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Fatalf("Apply iter %d: %v", i, err)
|
||||
}
|
||||
// Stagger to ensure distinct nanosecond stamps.
|
||||
time.Sleep(2 * time.Millisecond)
|
||||
}
|
||||
|
||||
entries, _ := os.ReadDir(dir)
|
||||
count := 0
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), BackupSuffix) {
|
||||
count++
|
||||
}
|
||||
}
|
||||
if count != keep {
|
||||
t.Errorf("backup count after 5 deploys with retention=%d = %d, want %d", keep, count, keep)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_NoExistingFile_UsesDefaultsForOwnerGroupMode covers
|
||||
// the first-deploy path: destination doesn't exist; FileDefaults
|
||||
// applies. We verify the mode default lands; owner/group default
|
||||
// is exercised in resolveOwnership unit tests (would require root
|
||||
// for cross-user chown).
|
||||
func TestApply_NoExistingFile_UsesDefaultsForOwnerGroupMode(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
|
||||
plan := Plan{
|
||||
Files: []File{
|
||||
{Path: cert, Bytes: []byte(testCert1)},
|
||||
},
|
||||
Defaults: FileDefaults{Mode: 0640},
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
stat, err := os.Stat(cert)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if stat.Mode().Perm() != 0640 {
|
||||
t.Errorf("default mode for new file = %#o, want 0640", stat.Mode().Perm())
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_TempFileCleanedUpOnError checks that a
|
||||
// failure mid-flight (we simulate by passing an unwritable
|
||||
// directory) leaves no .certctl-tmp.* file behind.
|
||||
func TestAtomicWriteFile_TempFileCleanedUpOnError(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
// Make the directory read-only AFTER the temp open would fail.
|
||||
// Easier: target a path inside a directory that doesn't exist.
|
||||
ghost := filepath.Join(dir, "does-not-exist", "tls.crt")
|
||||
_, err := AtomicWriteFile(context.Background(), ghost, []byte(testCert1), WriteOptions{})
|
||||
if err == nil {
|
||||
t.Fatal("expected error writing into nonexistent directory")
|
||||
}
|
||||
// No leaked temps in the parent (which does exist).
|
||||
entries, _ := os.ReadDir(dir)
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), TempSuffix) {
|
||||
t.Errorf("temp file leaked: %s", e.Name())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_RenameRaceWithReader_AtomicReadAlwaysSeesOldOrNew
|
||||
// pins the load-bearing POSIX-rename atomicity: a concurrent
|
||||
// reader hitting the destination during a write either sees the
|
||||
// pre-write bytes or the post-write bytes; never an intermediate
|
||||
// state.
|
||||
func TestAtomicWriteFile_RenameRaceWithReader_AtomicReadAlwaysSeesOldOrNew(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "tls.crt")
|
||||
old := []byte(strings.Repeat("OLD", 1000))
|
||||
newer := []byte(strings.Repeat("NEW", 1000))
|
||||
if err := os.WriteFile(path, old, 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
stop := make(chan struct{})
|
||||
var torn atomic.Bool
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(1)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
for {
|
||||
select {
|
||||
case <-stop:
|
||||
return
|
||||
default:
|
||||
}
|
||||
b, err := os.ReadFile(path)
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
s := string(b)
|
||||
if s != string(old) && s != string(newer) {
|
||||
torn.Store(true)
|
||||
return
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
// Issue many writes back and forth.
|
||||
for i := 0; i < 30; i++ {
|
||||
writeBytes := old
|
||||
if i%2 == 0 {
|
||||
writeBytes = newer
|
||||
}
|
||||
if _, err := AtomicWriteFile(context.Background(), path, writeBytes, WriteOptions{
|
||||
SkipIdempotent: true,
|
||||
}); err != nil {
|
||||
t.Fatalf("AtomicWriteFile %d: %v", i, err)
|
||||
}
|
||||
}
|
||||
close(stop)
|
||||
wg.Wait()
|
||||
if torn.Load() {
|
||||
t.Error("torn read observed (rename was not atomic)")
|
||||
}
|
||||
}
|
||||
|
||||
// --- White-box tests for resolveOwnership (chown semantics under
|
||||
// non-root require this, since we can't write a chown-to-root
|
||||
// integration test without sudo). ---
|
||||
|
||||
// TestResolveOwnership_ExplicitOverride_Wins verifies that an
|
||||
// explicit File.Mode/Owner/Group beats both existing-file
|
||||
// preservation and Defaults fallback.
|
||||
func TestResolveOwnership_ExplicitOverride_Wins(t *testing.T) {
|
||||
currentUser, _ := user.Current()
|
||||
currentGroup, _ := user.LookupGroupId(currentUser.Gid)
|
||||
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
if err := os.WriteFile(path, []byte("x"), 0600); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
stat, _ := os.Stat(path)
|
||||
res, err := resolveOwnership(File{
|
||||
Path: path,
|
||||
Mode: 0644,
|
||||
Owner: currentUser.Username,
|
||||
Group: currentGroup.Name,
|
||||
}, FileDefaults{Mode: 0400, Owner: "nobody", Group: "nogroup"}, stat)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if res.Mode != 0644 {
|
||||
t.Errorf("mode = %#o, want 0644 (override should win)", res.Mode)
|
||||
}
|
||||
if res.OwnerLabel != currentUser.Username {
|
||||
t.Errorf("owner label = %q, want %q (override should win)", res.OwnerLabel, currentUser.Username)
|
||||
}
|
||||
}
|
||||
|
||||
// TestResolveOwnership_PreservesExisting_WhenNoOverride verifies
|
||||
// the preservation path: no explicit override + existing file →
|
||||
// existing uid/gid/mode are returned.
|
||||
func TestResolveOwnership_PreservesExisting_WhenNoOverride(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
if err := os.WriteFile(path, []byte("x"), 0640); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := os.Chmod(path, 0640); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
stat, _ := os.Stat(path)
|
||||
|
||||
res, err := resolveOwnership(File{Path: path}, FileDefaults{Mode: 0400}, stat)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if res.Mode != 0640 {
|
||||
t.Errorf("mode = %#o, want 0640 (preservation)", res.Mode)
|
||||
}
|
||||
uid, gid, ok := unixOwnerFromStat(stat)
|
||||
if !ok {
|
||||
t.Skip("non-unix platform")
|
||||
}
|
||||
if res.UID != uid || res.GID != gid {
|
||||
t.Errorf("uid/gid = %d/%d, want %d/%d", res.UID, res.GID, uid, gid)
|
||||
}
|
||||
}
|
||||
|
||||
// TestResolveOwnership_NewFile_FallsBackToDefaults verifies the
|
||||
// defaults path: no override + no existing file → Plan.Defaults.
|
||||
func TestResolveOwnership_NewFile_FallsBackToDefaults(t *testing.T) {
|
||||
currentUser, _ := user.Current()
|
||||
currentGroup, _ := user.LookupGroupId(currentUser.Gid)
|
||||
|
||||
res, err := resolveOwnership(File{Path: "/tmp/never"}, FileDefaults{
|
||||
Mode: 0640,
|
||||
Owner: currentUser.Username,
|
||||
Group: currentGroup.Name,
|
||||
}, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if res.Mode != 0640 {
|
||||
t.Errorf("mode = %#o, want 0640 (default)", res.Mode)
|
||||
}
|
||||
if res.OwnerLabel != currentUser.Username {
|
||||
t.Errorf("owner = %q, want %q (default)", res.OwnerLabel, currentUser.Username)
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_RejectsInvalidPlan_NoFiles + duplicate-paths + empty-
|
||||
// path. Pin the validatePlan gate.
|
||||
func TestApply_RejectsInvalidPlan(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
plan Plan
|
||||
}{
|
||||
{"no files", Plan{}},
|
||||
{"empty path", Plan{Files: []File{{Path: "", Bytes: []byte("x")}}}},
|
||||
{"duplicate", Plan{Files: []File{
|
||||
{Path: "/tmp/dup", Bytes: []byte("a")},
|
||||
{Path: "/tmp/dup", Bytes: []byte("b")},
|
||||
}}},
|
||||
}
|
||||
for _, tc := range tests {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
_, err := Apply(context.Background(), tc.plan)
|
||||
if !errors.Is(err, ErrPlanInvalid) {
|
||||
t.Errorf("got %v, want ErrPlanInvalid", err)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_ContextCancelledBeforeStart_AbortsCleanly pins the
|
||||
// context-respect contract: a cancelled context aborts before
|
||||
// any I/O.
|
||||
func TestApply_ContextCancelledBeforeStart_AbortsCleanly(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
cancel()
|
||||
_, err := Apply(ctx, Plan{
|
||||
Files: []File{{Path: cert, Bytes: []byte(testCert1)}},
|
||||
})
|
||||
if err == nil || !errors.Is(err, context.Canceled) {
|
||||
t.Errorf("got %v, want context.Canceled", err)
|
||||
}
|
||||
if _, statErr := os.Stat(cert); statErr == nil {
|
||||
t.Error("file was created despite cancelled context")
|
||||
}
|
||||
}
|
||||
|
||||
// TestApply_NoBackupRetention_DisablesBackups pins
|
||||
// BackupRetention = -1 sentinel: no backup created; rollback
|
||||
// becomes impossible.
|
||||
func TestApply_NoBackupRetention_DisablesBackups(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
cert := filepath.Join(dir, "tls.crt")
|
||||
if err := os.WriteFile(cert, []byte("ORIGINAL"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
plan := Plan{
|
||||
Files: []File{{Path: cert, Bytes: []byte(testCert1)}},
|
||||
BackupRetention: -1,
|
||||
}
|
||||
if _, err := Apply(context.Background(), plan); err != nil {
|
||||
t.Fatalf("Apply: %v", err)
|
||||
}
|
||||
entries, _ := os.ReadDir(dir)
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), BackupSuffix) {
|
||||
t.Errorf("backup created despite BackupRetention=-1: %s", e.Name())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_HappyPath_ReplacesExistingAtomically covers
|
||||
// the simple AtomicWriteFile path used by F5 + K8s connectors.
|
||||
func TestAtomicWriteFile_HappyPath_ReplacesExistingAtomically(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
if err := os.WriteFile(path, []byte("OLD"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
res, err := AtomicWriteFile(context.Background(), path, []byte("NEW"), WriteOptions{})
|
||||
if err != nil {
|
||||
t.Fatalf("AtomicWriteFile: %v", err)
|
||||
}
|
||||
if !res.Replaced {
|
||||
t.Error("Replaced=false; want true")
|
||||
}
|
||||
if res.BackupPath == "" {
|
||||
t.Error("expected non-empty BackupPath")
|
||||
}
|
||||
if got, _ := os.ReadFile(path); string(got) != "NEW" {
|
||||
t.Errorf("file = %q, want NEW", got)
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_IdempotentSkip covers the AtomicWriteFile
|
||||
// SHA-256 skip — same coverage as Plan.Apply but for the lower-
|
||||
// level entry point used by F5/K8s.
|
||||
func TestAtomicWriteFile_IdempotentSkip(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "f")
|
||||
if err := os.WriteFile(path, []byte("SAME"), 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
res, err := AtomicWriteFile(context.Background(), path, []byte("SAME"), WriteOptions{})
|
||||
if err != nil {
|
||||
t.Fatalf("AtomicWriteFile: %v", err)
|
||||
}
|
||||
if !res.Idempotent {
|
||||
t.Error("Idempotent=false; want true")
|
||||
}
|
||||
if res.Replaced {
|
||||
t.Error("Replaced=true on idempotent skip; want false")
|
||||
}
|
||||
}
|
||||
|
||||
// TestAtomicWriteFile_RejectsEmptyPath pins the input validation.
|
||||
func TestAtomicWriteFile_RejectsEmptyPath(t *testing.T) {
|
||||
_, err := AtomicWriteFile(context.Background(), "", []byte("x"), WriteOptions{})
|
||||
if !errors.Is(err, ErrPlanInvalid) {
|
||||
t.Errorf("got %v, want ErrPlanInvalid", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestPruneBackups_NoOp_WhenUnderRetention pins the early return
|
||||
// when there are fewer backups than the retention bar.
|
||||
func TestPruneBackups_NoOp_WhenUnderRetention(t *testing.T) {
|
||||
dir := t.TempDir()
|
||||
abs := filepath.Join(dir, "f")
|
||||
// Create two backup-style files.
|
||||
os.WriteFile(abs+BackupSuffix+"0000000000000000001", []byte("a"), 0644)
|
||||
os.WriteFile(abs+BackupSuffix+"0000000000000000002", []byte("b"), 0644)
|
||||
if err := pruneBackups(abs, 5); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
entries, _ := os.ReadDir(dir)
|
||||
count := 0
|
||||
for _, e := range entries {
|
||||
if strings.Contains(e.Name(), BackupSuffix) {
|
||||
count++
|
||||
}
|
||||
}
|
||||
if count != 2 {
|
||||
t.Errorf("count = %d, want 2 (no pruning under retention)", count)
|
||||
}
|
||||
}
|
||||
|
||||
// TestLookupUID_Numeric covers the "numeric passthrough" branch
|
||||
// of lookupUID — agents can configure with either "nginx" or "1000".
|
||||
func TestLookupUID_Numeric(t *testing.T) {
|
||||
uid, err := lookupUID("12345")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if uid != 12345 {
|
||||
t.Errorf("uid = %d, want 12345", uid)
|
||||
}
|
||||
}
|
||||
|
||||
// TestLookupGID_Numeric mirror.
|
||||
func TestLookupGID_Numeric(t *testing.T) {
|
||||
gid, err := lookupGID("54321")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if gid != 54321 {
|
||||
t.Errorf("gid = %d, want 54321", gid)
|
||||
}
|
||||
}
|
||||
|
||||
// TestSHA256Eq_EdgeCases pins the helper used by the idempotency
|
||||
// short-circuit.
|
||||
func TestSHA256Eq_EdgeCases(t *testing.T) {
|
||||
if !sha256Eq([]byte{}, []byte{}) {
|
||||
t.Error("empty == empty failed")
|
||||
}
|
||||
if sha256Eq([]byte("a"), []byte("b")) {
|
||||
t.Error("a == b unexpectedly true")
|
||||
}
|
||||
if sha256Eq([]byte("ab"), []byte("ac")) {
|
||||
t.Error("ab == ac unexpectedly true")
|
||||
}
|
||||
if !sha256Eq([]byte("abc"), []byte("abc")) {
|
||||
t.Error("abc == abc failed")
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,69 @@
|
||||
// Package deploy provides the shared atomic-write + validate + rollback
|
||||
// primitive consumed by every target connector under
|
||||
// internal/connector/target/*.
|
||||
//
|
||||
// The deploy package closes the three procurement-checklist items where
|
||||
// commercial competitors (Venafi, DigiCert Certificate Manager, Sectigo)
|
||||
// historically beat certctl on a head-to-head deployment-grade
|
||||
// comparison:
|
||||
//
|
||||
// 1. Atomic deploy with rollback — every file write is "all or nothing".
|
||||
// A connector can never leave a target in a half-deployed state where
|
||||
// the cert is updated but the chain isn't (or vice versa). Ships via
|
||||
// Plan + Apply: temp-write all files together, run validate, atomic
|
||||
// rename them all, run reload; on reload failure restore previous
|
||||
// bytes + reload again.
|
||||
// 2. Post-deploy TLS verification — the Apply caller wires its own
|
||||
// PostCommit to do a TLS handshake against the target endpoint and
|
||||
// compare the leaf-cert SHA-256 against what was just written. The
|
||||
// deploy package surfaces the rollback wire when PostCommit fails;
|
||||
// the connector decides what failure means.
|
||||
// 3. (Vendor-specific deployment recipes — out of scope for the deploy
|
||||
// package; covered in Bundle II.)
|
||||
//
|
||||
// Design tenets — all load-bearing for 13 connectors:
|
||||
//
|
||||
// - All-or-nothing across files. A Plan with N File entries either
|
||||
// succeeds for all N or rolls back all N. No "two of three written"
|
||||
// intermediate states are possible from a successful or failed Apply.
|
||||
// - Cross-filesystem safety. Temp files always live in the same
|
||||
// directory as the final destination, so os.Rename is guaranteed
|
||||
// atomic on POSIX (a rename within the same filesystem). Writing
|
||||
// temp files in /tmp would silently fall back to copy-and-rename
|
||||
// across filesystems, breaking atomicity.
|
||||
// - Idempotency. If every File's destination already has identical
|
||||
// bytes (SHA-256 match), Apply returns SkippedAsIdempotent=true and
|
||||
// calls neither PreCommit nor PostCommit. Defends against agent
|
||||
// restart retry storms that would otherwise hammer the target with
|
||||
// no-op reloads.
|
||||
// - Ownership + mode preservation. The single most common
|
||||
// silent-failure mode in cert deploys is the agent running as root
|
||||
// calling os.WriteFile(path, bytes, 0600), which clobbers the
|
||||
// existing nginx:nginx 0640 ownership and locks NGINX out of the
|
||||
// key file. Apply preserves the existing destination's
|
||||
// owner+group+mode unless the per-target config overrides; for new
|
||||
// files it falls back to per-target-type defaults (e.g. nginx:nginx
|
||||
// 0640).
|
||||
// - Per-file serialization. The package keeps a sync.Map of file-level
|
||||
// mutexes so two concurrent Apply calls touching the same path
|
||||
// serialize. (Per-target serialization is Phase 2's job in the
|
||||
// agent dispatch; this is a finer-grained file-level guard.)
|
||||
// - Backup retention. Each successful write copies the previous bytes
|
||||
// to <path>.certctl-bak.<unix-nanos>. A janitor prunes to the last
|
||||
// N backups (default 3, configurable via Plan.BackupRetention or
|
||||
// the CERTCTL_DEPLOY_BACKUP_RETENTION env var the agent passes in).
|
||||
// Setting retention to 0 disables backups entirely — rollback
|
||||
// becomes impossible; documented as a foot-gun.
|
||||
//
|
||||
// Origin: this package was created in the deploy-hardening I master
|
||||
// bundle (Phase 1) as the load-bearing replacement for the duplicated
|
||||
// os.WriteFile flows in 13 connectors. The Apply API mirrors the F5
|
||||
// transaction model already at internal/connector/target/f5/f5.go:267
|
||||
// — F5 was the only connector with rollback semantics before this
|
||||
// bundle. Apply lifts that pattern up so every other connector gets
|
||||
// the same atomicity bar without re-implementing it.
|
||||
//
|
||||
// Concurrency: every exported function is safe for concurrent callers.
|
||||
// File-level serialization is automatic via the package-internal
|
||||
// sync.Map of mutexes; callers do not need their own per-file lock.
|
||||
package deploy
|
||||
@@ -0,0 +1,185 @@
|
||||
package deploy
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"os"
|
||||
"os/user"
|
||||
"strconv"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
// resolvedOwnership describes the final (mode, uid, gid) to apply
|
||||
// to a destination file. Resolution honors the precedence:
|
||||
//
|
||||
// 1. Explicit File.Mode/Owner/Group → use as given
|
||||
// 2. Existing destination file → preserve that file's mode/uid/gid
|
||||
// 3. Plan.Defaults / WriteOptions.Default* → use as fallback
|
||||
// 4. Nothing set → leave as os.WriteFile default (file mode = 0644
|
||||
// for new files; uid/gid = process-effective)
|
||||
//
|
||||
// uid / gid are -1 when no chown should occur (no override AND no
|
||||
// existing file AND no default → leave as-is).
|
||||
type resolvedOwnership struct {
|
||||
Mode os.FileMode
|
||||
UID int // -1 = do not chown
|
||||
GID int // -1 = do not chgrp (must come together with UID)
|
||||
ModeSet bool
|
||||
OwnerLabel string // best-effort string for diagnostics ("" if unknown)
|
||||
GroupLabel string
|
||||
}
|
||||
|
||||
// resolveOwnership computes the final mode/uid/gid for a file.
|
||||
// existingStat is nil when the destination does not exist.
|
||||
func resolveOwnership(file File, defaults FileDefaults, existingStat os.FileInfo) (resolvedOwnership, error) {
|
||||
res := resolvedOwnership{UID: -1, GID: -1}
|
||||
|
||||
// Mode resolution.
|
||||
switch {
|
||||
case file.Mode != 0:
|
||||
res.Mode = file.Mode
|
||||
res.ModeSet = true
|
||||
case existingStat != nil:
|
||||
res.Mode = existingStat.Mode().Perm()
|
||||
res.ModeSet = true
|
||||
case defaults.Mode != 0:
|
||||
res.Mode = defaults.Mode
|
||||
res.ModeSet = true
|
||||
default:
|
||||
// Nothing to apply; AtomicWriteFile uses os.WriteFile's
|
||||
// default 0644-ish for new files, preserves for existing.
|
||||
res.Mode = 0
|
||||
res.ModeSet = false
|
||||
}
|
||||
|
||||
// Owner / group resolution.
|
||||
owner, group := file.Owner, file.Group
|
||||
switch {
|
||||
case owner != "" && group != "":
|
||||
// explicit override
|
||||
case existingStat != nil:
|
||||
// preserve existing — extract from sys-stat
|
||||
uid, gid, ok := unixOwnerFromStat(existingStat)
|
||||
if ok {
|
||||
res.UID, res.GID = uid, gid
|
||||
// Best-effort labels for logs (don't fail if user/group
|
||||
// has been deleted from /etc/passwd between deploys).
|
||||
if u, err := user.LookupId(strconv.Itoa(uid)); err == nil {
|
||||
res.OwnerLabel = u.Username
|
||||
}
|
||||
if g, err := user.LookupGroupId(strconv.Itoa(gid)); err == nil {
|
||||
res.GroupLabel = g.Name
|
||||
}
|
||||
}
|
||||
return res, nil
|
||||
case defaults.Owner != "" && defaults.Group != "":
|
||||
owner, group = defaults.Owner, defaults.Group
|
||||
default:
|
||||
// No override, no existing file, no defaults — leave UID/GID
|
||||
// at -1 so AtomicWriteFile skips the chown entirely.
|
||||
return res, nil
|
||||
}
|
||||
|
||||
uid, err := lookupUID(owner)
|
||||
if err != nil {
|
||||
return res, fmt.Errorf("resolve owner %q: %w", owner, err)
|
||||
}
|
||||
gid, err := lookupGID(group)
|
||||
if err != nil {
|
||||
return res, fmt.Errorf("resolve group %q: %w", group, err)
|
||||
}
|
||||
res.UID, res.GID = uid, gid
|
||||
res.OwnerLabel, res.GroupLabel = owner, group
|
||||
return res, nil
|
||||
}
|
||||
|
||||
// applyOwnership applies the resolved (mode, uid, gid) to path.
|
||||
// Both chown and chmod are best-effort: we attempt them, log
|
||||
// warnings on failure, but do NOT fail the deploy. The agent runs
|
||||
// as root in production; running as a regular user (CI / developer
|
||||
// workstation) means chown to a different user fails with EPERM,
|
||||
// which is expected and not actionable. The deploy semantically
|
||||
// succeeded — only ownership lift was skipped.
|
||||
//
|
||||
// The "is this acceptable to silently swallow chown failure?"
|
||||
// question is answered yes for two reasons:
|
||||
// - In production (root agent), failures are real OS-level
|
||||
// issues that show up in the audit log + Prometheus
|
||||
// deploy_validate_failures_total counter.
|
||||
// - In dev (non-root), failures are expected behavior; tests
|
||||
// would otherwise need to be skipped or run with sudo.
|
||||
//
|
||||
// Connectors that NEED hard ownership enforcement (e.g. compliance
|
||||
// audits) can wrap a stat-after-write check in their PostCommit.
|
||||
func applyOwnership(path string, res resolvedOwnership) error {
|
||||
if res.ModeSet {
|
||||
if err := os.Chmod(path, res.Mode); err != nil {
|
||||
return fmt.Errorf("chmod %s to %#o: %w", path, res.Mode, err)
|
||||
}
|
||||
}
|
||||
if res.UID >= 0 && res.GID >= 0 {
|
||||
if err := os.Chown(path, res.UID, res.GID); err != nil {
|
||||
// EPERM in non-root contexts is expected. We surface
|
||||
// the error to the caller, which decides whether to
|
||||
// log + continue or hard-fail. Apply hard-fails the
|
||||
// deploy on chown errors (the Plan asked for
|
||||
// specific ownership; we couldn't deliver it; safer
|
||||
// to roll back than to silently leave wrong perms).
|
||||
return fmt.Errorf("chown %s to %d:%d: %w", path, res.UID, res.GID, err)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// lookupUID resolves a username to a numeric uid. Accepts numeric
|
||||
// strings ("1000") as a passthrough so the agent can accept either
|
||||
// "nginx" or "1000" in operator config.
|
||||
func lookupUID(username string) (int, error) {
|
||||
if username == "" {
|
||||
return -1, errors.New("empty username")
|
||||
}
|
||||
if uid, err := strconv.Atoi(username); err == nil {
|
||||
return uid, nil
|
||||
}
|
||||
u, err := user.Lookup(username)
|
||||
if err != nil {
|
||||
return -1, err
|
||||
}
|
||||
uid, err := strconv.Atoi(u.Uid)
|
||||
if err != nil {
|
||||
return -1, fmt.Errorf("user %q has non-numeric uid %q: %w", username, u.Uid, err)
|
||||
}
|
||||
return uid, nil
|
||||
}
|
||||
|
||||
// lookupGID resolves a group name to a numeric gid.
|
||||
func lookupGID(groupname string) (int, error) {
|
||||
if groupname == "" {
|
||||
return -1, errors.New("empty groupname")
|
||||
}
|
||||
if gid, err := strconv.Atoi(groupname); err == nil {
|
||||
return gid, nil
|
||||
}
|
||||
g, err := user.LookupGroup(groupname)
|
||||
if err != nil {
|
||||
return -1, err
|
||||
}
|
||||
gid, err := strconv.Atoi(g.Gid)
|
||||
if err != nil {
|
||||
return -1, fmt.Errorf("group %q has non-numeric gid %q: %w", groupname, g.Gid, err)
|
||||
}
|
||||
return gid, nil
|
||||
}
|
||||
|
||||
// unixOwnerFromStat extracts (uid, gid) from a Unix-style FileInfo.
|
||||
// On non-Unix platforms or when the underlying stat doesn't expose
|
||||
// uid/gid, returns ok=false.
|
||||
func unixOwnerFromStat(fi os.FileInfo) (uid int, gid int, ok bool) {
|
||||
if fi == nil {
|
||||
return -1, -1, false
|
||||
}
|
||||
if sysStat, isUnix := fi.Sys().(*syscall.Stat_t); isUnix {
|
||||
return int(sysStat.Uid), int(sysStat.Gid), true
|
||||
}
|
||||
return -1, -1, false
|
||||
}
|
||||
@@ -0,0 +1,245 @@
|
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package deploy
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import (
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"context"
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"errors"
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"os"
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"time"
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)
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// Sentinel errors. All errors returned by Apply wrap exactly one of
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// these so connector callers can use errors.Is to distinguish the
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// failure mode without parsing strings.
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var (
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// ErrValidateFailed is returned when the Plan's PreCommit hook
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// returns an error. Connectors typically map PreCommit to a
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// validate-with-the-target command (`nginx -t -c <temp>`,
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// `apachectl configtest -f <temp>`, `haproxy -c -f <temp>`).
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// On ErrValidateFailed, no live file has been touched: the temp
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// files are cleaned up and the destinations are exactly as they
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// were before Apply was called.
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ErrValidateFailed = errors.New("deploy: validate (PreCommit) failed")
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// ErrReloadFailed is returned when the Plan's PostCommit hook
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// returns an error AND the rollback succeeded. The destination
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// files now hold the PREVIOUS bytes (restored from backup) and
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// PostCommit was re-called against those bytes. The deploy is
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// effectively a no-op from the operator's perspective.
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ErrReloadFailed = errors.New("deploy: reload (PostCommit) failed; rolled back")
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// ErrRollbackFailed is the operator-actionable escalation:
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// PostCommit failed, AND the rollback (restore + re-PostCommit)
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// also failed. The deploy is in a known-bad state. Manual
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// intervention is required to either restore the backup files
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// (paths in Result.BackupPaths) or push a fresh known-good
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// cert. Connectors emit a loud audit + alert when they see this.
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ErrRollbackFailed = errors.New("deploy: reload failed AND rollback also failed; manual intervention required")
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// ErrPlanInvalid is returned for malformed Plans (no Files,
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// duplicate destination paths, empty Path entries, etc.) before
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// any I/O is performed. Strictly a programming error from the
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// connector — never seen in production once the connector unit
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// tests pass.
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ErrPlanInvalid = errors.New("deploy: plan is invalid")
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)
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// File describes one target file that Plan.Apply will write.
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//
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// When Mode is zero, the existing destination's mode is preserved if
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// the destination exists; otherwise Plan.Defaults.Mode applies. Same
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// for Owner / Group. This means connectors can ship a Plan with
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// File{Path: ..., Bytes: ...} entries (no explicit ownership) and
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// the package will Do The Right Thing — preserve nginx:nginx 0640 on
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// renewal, fall back to per-target defaults on first deploy.
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type File struct {
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// Path is the final destination on disk. Must be an absolute
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// path. The temp file used during atomic write is written in
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// filepath.Dir(Path) to guarantee same-filesystem rename.
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Path string
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// Bytes is the new contents to write.
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Bytes []byte
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// Mode is the desired final file mode. Zero means "preserve
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// existing or use Plan.Defaults.Mode for new files".
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Mode os.FileMode
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// Owner is the username to chown to. Empty means "preserve
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// existing or use Plan.Defaults.Owner for new files". Resolved
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// at write time via os/user.Lookup.
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Owner string
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// Group is the group name to chgrp to. Empty means "preserve
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// existing or use Plan.Defaults.Group for new files". Resolved
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// via os/user.LookupGroup.
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Group string
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}
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// FileDefaults applies to any File whose own Mode/Owner/Group is
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// zero AND whose destination does not yet exist. Connectors set
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// these to per-target-type sensible defaults (e.g. NGINX:
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// {Mode: 0640, Owner: "nginx", Group: "nginx"}).
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type FileDefaults struct {
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Mode os.FileMode
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Owner string
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Group string
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}
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// Plan represents one atomic deployment. All Files succeed together
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// or roll back together.
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type Plan struct {
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// Files is the set of (path, contents, ownership) entries this
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// Plan writes. Order is irrelevant — Apply writes them all
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// before calling PreCommit, and atomically renames them all
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// before calling PostCommit.
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Files []File
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// Defaults applies to any File entry whose own Mode/Owner/Group
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// fields are zero AND whose destination does not yet exist.
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// When the destination already exists, the existing
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// ownership/mode is preserved unless the File entry overrides.
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Defaults FileDefaults
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// PreCommit is invoked after all temp files are written but
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// BEFORE the atomic rename. The map argument is keyed by
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// File.Path → temp file path so the connector can run a
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// validate-with-the-target command against the temp file
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// (e.g. `nginx -t -c <temp>`). Returning a non-nil error
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// aborts the deploy: the temp files are cleaned up and Apply
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// returns ErrValidateFailed wrapping the PreCommit error.
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//
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// Optional. nil PreCommit means "no validate step" — Apply
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// proceeds straight to the atomic rename + PostCommit.
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PreCommit func(ctx context.Context, tempPaths map[string]string) error
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// PostCommit is invoked after every File has been atomically
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// renamed to its final path. Connectors typically map this to
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// a service reload (`nginx -s reload`, `systemctl reload
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// haproxy`). Returning a non-nil error triggers automatic
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// rollback: the destinations are restored from the pre-deploy
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// backups and PostCommit is called a second time against the
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// restored bytes. If the second PostCommit also fails, Apply
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// returns ErrRollbackFailed.
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//
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// Optional. nil PostCommit means "no reload step" — Apply
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// returns immediately after the atomic rename.
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PostCommit func(ctx context.Context) error
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// BackupRetention is the number of historical backups to keep
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// per File path after a successful Apply. Older backups are
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// garbage-collected by a synchronous janitor pass at the end
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// of Apply.
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//
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// Zero (the field default) maps to DefaultBackupRetention (3).
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// Set to a sentinel negative value (-1) to disable backups
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// entirely — rollback becomes impossible; ErrReloadFailed is
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// instead surfaced as a hard error with no recovery.
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BackupRetention int
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// SkipIdempotent forces Apply to run PreCommit + PostCommit
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// even when every File's bytes already match the destination.
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// Useful when the connector knows an external configuration
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// change requires re-validation. Defaults to false (skip on
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// SHA-256 match — the safe and usual case).
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SkipIdempotent bool
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}
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// Result describes what Apply did. Connectors populate audit logs
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// and Prometheus counters from this.
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type Result struct {
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// SkippedAsIdempotent is true when every File's destination
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// already had identical bytes and SkipIdempotent was false.
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// PreCommit and PostCommit were NOT called. BackupPaths is
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// empty in this case — no backups are created for a no-op.
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SkippedAsIdempotent bool
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// BackupPaths maps each File.Path to the path of the backup
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// of the previous contents. When a destination did not exist
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// before Apply, the entry maps to "" (no backup possible).
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// Empty when SkippedAsIdempotent is true.
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BackupPaths map[string]string
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// ValidateOK is true when PreCommit returned nil (or was nil
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// to begin with).
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ValidateOK bool
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// Reloaded is true when PostCommit returned nil (or was nil)
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// AND no rollback occurred.
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Reloaded bool
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// RolledBack is true when PostCommit failed AND the rollback
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// succeeded. ErrReloadFailed will be returned alongside.
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RolledBack bool
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// Duration is the wall-clock time Apply took, including
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// PreCommit + PostCommit + (if applicable) rollback.
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Duration time.Duration
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}
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// WriteOptions controls AtomicWriteFile, the lower-level building
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// block exposed for connectors that don't fit the Plan model
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// (typically connectors that ship bytes through a remote API rather
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// than a local filesystem — F5, K8s).
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type WriteOptions struct {
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// Mode is the desired final file mode. Zero = preserve
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// existing or use DefaultMode for new files.
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Mode os.FileMode
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// DefaultMode applies when Mode is zero AND the destination
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// does not yet exist.
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DefaultMode os.FileMode
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// Owner / Group: empty = preserve existing or use
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// DefaultOwner/Group for new files.
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Owner string
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Group string
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DefaultOwner string
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DefaultGroup string
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// SkipIdempotent forces a write even when the destination
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// already has identical bytes. Defaults to false.
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SkipIdempotent bool
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// BackupRetention controls how many historical backups to
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// keep. Zero = DefaultBackupRetention (3); -1 = no backups.
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BackupRetention int
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}
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// WriteResult describes what AtomicWriteFile did.
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type WriteResult struct {
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// Path is the final destination (echoed for caller convenience).
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Path string
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// BackupPath is the path to the pre-write backup, or "" when
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// no backup was taken (file did not exist or backups disabled
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// or write was idempotent-skipped).
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BackupPath string
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// Replaced is true when an existing file was replaced. False
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// when the file did not previously exist OR the write was
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// idempotent-skipped.
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Replaced bool
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// Idempotent is true when the destination already had
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// identical bytes and SkipIdempotent was false. No write
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// occurred in this case.
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Idempotent bool
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}
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// DefaultBackupRetention is the number of historical backup files
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// kept per File path after a successful Apply (or
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// AtomicWriteFile call). Operators can override per-call via
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// Plan.BackupRetention or via the CERTCTL_DEPLOY_BACKUP_RETENTION
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// env var that the agent passes in.
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const DefaultBackupRetention = 3
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// BackupSuffix is the suffix used for pre-write backup files.
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// Format: <original>.certctl-bak.<unix-nanos>. The unix-nanos is
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// monotonic enough for retention sort order (lexicographic =
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// chronological) without needing per-file metadata.
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const BackupSuffix = ".certctl-bak."
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// TempSuffix is the suffix used for in-flight temp files. Format:
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// <original>.certctl-tmp.<unix-nanos>. Cleaned up on PreCommit
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// failure or on Apply panic.
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const TempSuffix = ".certctl-tmp."
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Reference in New Issue
Block a user