BFE Engineering
42fb386f60
Replace every em dash with real punctuation (rewrites, not hyphen swaps) in docs, code comments, scripts, configs, and the port records; convert en dashes, curly quotes, ellipsis glyphs, arrows, and section signs to ASCII; drop machine-writing tell phrases from living docs. ADR titles now use a colon. The M2 bring-up DTS model string carried an em dash into the patch series and its record echoes; fixed at both, and the full series re-verified to apply cleanly onto pristine 6.18.46. One comment in freshness.h deliberately names the em dash glyph the UI renders as the unknown mark; that is data, kept as prose naming it. Verified: cargo tests (sim, config-lint, rs485-bridge), shellcheck, both driver MC/DC harnesses, patches-apply.
51 lines
1.7 KiB
Plaintext
Executable File
51 lines
1.7 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: $root has no /sbin/init: staying in initramfs"
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umount /mnt
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return 0
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fi
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if ! command -v switch_root >/dev/null; then
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echo "rc: busybox lacks switch_root: staying in initramfs"
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umount /mnt
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return 0
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fi
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# Hand the live devtmpfs to the new root: busybox switch_root moves nothing,
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# and a REAL device rootfs's init expects /dev to already be there (its getty
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# opens /dev/console immediately). Our own skeleton init remounts devtmpfs
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# defensively either way.
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mkdir -p /mnt/dev
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mount -o move /dev /mnt/dev 2>/dev/null || mount --move /dev /mnt/dev
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echo "rc: switching root to rootfs${slot} ($root)"
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exec switch_root /mnt /sbin/init
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