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fix(installer): emit kernel cmdline to ttyS0 alongside tty0 (mulga-siv-33)

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GRUB_CMDLINE_LINUX in /etc/default/grub only listed console=tty0, so the
installed kernel printed nothing on serial after the GRUB menu. Headless
installs (CI, racks with serial-only IPMI, remote-dev SSH-to-QEMU) saw a
black screen forever and had no path to debug boot failures.

Append console=ttyS0,115200 — the last `console=` on the cmdline becomes
the system console, so ttyS0 wins on serial-only hardware while tty0
still receives output on local displays.

Plan: docs/development/bugs/iso-public-ip-boot-race.md
This commit is contained in:
joshsiv-mulga
2026-04-29 21:54:07 +10:00
parent 9b9bcc5b8f
commit 7b8bb92905
1 changed files with 6 additions and 5 deletions
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cmd/installer/install/install.go
+6 -5
View File
@@ -465,15 +465,16 @@ func installBootloader(disk string) error {
copySplashImage(mountRoot)
copyGrubFont(mountRoot)
// Kernel cmdline and basic defaults only — graphics/serial handled by 05_spinifex below.
// Confirm requirement
// console=ttyS0,115200n8
// Both consoles listed: tty0 stays primary for local install, ttyS0 mirrors
// kernel output to serial so headless installs (CI, racks with serial-only
// IPMI, remote-dev SSH-to-QEMU) see boot messages. The last `console=` on
// the cmdline becomes the system console, so ttyS0 wins on serial-only
// hardware while tty0 still receives output for local display.
grubDefault := `GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=Spinifex
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="console=tty0 systemd.show_status=1"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200 systemd.show_status=1"
`
if err := os.WriteFile(filepath.Join(mountRoot, "etc/default/grub"), []byte(grubDefault), 0o644); err != nil {