BFE EngineeringandClaude Fable 5
abbc690277
ubuntu-latest ships shellcheck 0.9.0, which warns that ash scripts are checked as dash; 0.10 (local) does not. shell=dash is the accurate dialect for busybox ash. Verified clean under BOTH versions; boot smoke re-run. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018HUayid7W5w7jBdb9Rrj1K
44 lines
1.4 KiB
Plaintext
Executable File
44 lines
1.4 KiB
Plaintext
Executable File
#!/bin/busybox sh
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# shellcheck shell=dash
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# Stage-1 rc: sourced by /init (still PID 1, initramfs root) when a virtio
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# disk is present. Emulates U-Boot's slot choice — mount the validated slot's
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# rootfs and switch_root into it. This is an EMULATION of the A/B selection
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# outcome, not the BCB/bootcount mechanism itself.
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#
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# Every guarded failure path `return`s to /init (valid in a sourced script;
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# /init then falls through to shell/poweroff). The final exec is the one
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# unguardable step: if switch_root itself fails to launch, the shell — PID 1 —
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# exits and the kernel panics; the applet-existence check below catches the
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# only preventable variant of that.
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# shellcheck source=qemu/rootfs/etc/warden-lib.sh disable=SC1091
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. /etc/warden-lib.sh
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warden_populate_by_name
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slot="$(warden_slot)"
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root="/dev/block/by-name/rootfs${slot}"
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if [ ! -e "$root" ]; then
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echo "rc: $root missing — staying in initramfs"
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return 0
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fi
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mkdir -p /mnt
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if ! mount -t ext4 "$root" /mnt; then
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echo "rc: mount of $root failed — staying in initramfs"
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return 0
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fi
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if [ ! -x /mnt/sbin/init ]; then
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echo "rc: $root has no /sbin/init — staying in initramfs"
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umount /mnt
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return 0
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fi
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if ! command -v switch_root >/dev/null; then
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echo "rc: busybox lacks switch_root — staying in initramfs"
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umount /mnt
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return 0
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fi
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echo "rc: switching root to rootfs${slot} ($root)"
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exec switch_root /mnt /sbin/init
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