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shankar0123
b721596213
Sprint 3 unified-master-audit closure. The Helm chart's _helpers.tpl
(line 133) renders the bundled-Postgres URL with a literal
'$(POSTGRES_PASSWORD)' placeholder:
postgres://certctl:$(POSTGRES_PASSWORD)@db:5432/certctl?sslmode=disable
Kubernetes' '$(VAR)' env-substitution syntax ONLY expands when the
value is a string literal in the Pod spec. Values sourced from
'valueFrom.secretKeyRef' (which is how the chart wires
CERTCTL_DATABASE_URL) are NOT expanded — the literal makes it all
the way to the server, which tries to dial Postgres with
'$(POSTGRES_PASSWORD)' as the password, fails with auth error, and
leaks the placeholder into application error logs.
Fix: in-process expansion at internal/config/config.expandDatabaseURL.
strings.ReplaceAll of the literal '$(POSTGRES_PASSWORD)' token with
os.Getenv('POSTGRES_PASSWORD') when both the token is present AND
the env var is set. Conservative — no os.ExpandEnv (which would
expand any $VAR), no Docker entrypoint shim, no Helm-template-time
password injection that would inline the secret into a second
Kubernetes resource. External-Postgres deploys whose URL embeds
the real password pass through untouched because the placeholder
doesn't match.
Regression coverage in internal/config/config_test.go pins:
- happy-path placeholder substitution
- non-placeholder URL passes through unchanged
- placeholder + empty POSTGRES_PASSWORD leaves the URL alone
- multi-occurrence safety via ReplaceAll
Closes DEPL-004.