115 lines
2.4 KiB
Bash
Executable File
115 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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set -eu
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log() {
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echo "[init] $*" >&2
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}
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panic() {
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echo "initramfs panic: $*" >&2
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exec sh
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}
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mount_or_panic() {
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mount "$@" || panic "mount failed: $*"
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}
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mount_retry() {
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dev="$1"
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target="$2"
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fstype="$3"
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opts="$4"
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i=0
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while :; do
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if mount -o "$opts" -t "$fstype" "$dev" "$target"; then
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return 0
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fi
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i=$((i + 1))
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[ "$i" -ge 50 ] && panic "Timed out mounting $dev on $target"
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sleep 0.2
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done
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}
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wait_for_path() {
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path="$1"
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i=0
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while [ ! -e "$path" ]; do
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i=$((i + 1))
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[ "$i" -ge 50 ] && panic "Timed out waiting for $path"
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sleep 0.2
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done
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}
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mkdir -p /dev /proc /sys /run
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mount_or_panic -t devtmpfs devtmpfs /dev
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mount_or_panic -t proc proc /proc
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mount_or_panic -t sysfs sysfs /sys
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mount_or_panic -t tmpfs tmpfs /run
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echo 1 > /proc/sys/kernel/printk
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mkdir -p /dev/pts
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mount_or_panic -t devpts devpts /dev/pts
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# Optional early fan kick. Do not fail boot if this path is not ready yet.
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if [ -w /sys/class/hwmon/hwmon0/pwm1 ]; then
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echo 100 > /sys/class/hwmon/hwmon0/pwm1 || true
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fi
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log "Booting kernel took $(cut -d' ' -f1 /proc/uptime) seconds."
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. /etc/build-info || panic "failed to source /etc/build-info"
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ROOT_DEV=""
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DATA_DEV=""
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for arg in $(cat /proc/cmdline); do
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case "$arg" in
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root=*)
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ROOT_DEV="${arg#root=}"
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;;
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data=*)
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DATA_DEV="${arg#data=}"
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;;
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esac
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done
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[ -n "$ROOT_DEV" ] || {
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log "No root= specified in cmdline"
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exec sh
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}
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[ -n "$DATA_DEV" ] || {
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log "No data= specified in cmdline"
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exec sh
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}
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wait_for_path "$DATA_DEV"
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e2fsck -p "$DATA_DEV" || {
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echo "Auto fsck failed, forcing repair"
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e2fsck -y "$DATA_DEV" || panic "fsck failed on $DATA_DEV"
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}
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mkdir -p /newroot
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mount_retry "$ROOT_DEV" /newroot ext4 ro
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mount_retry "$DATA_DEV" /newroot/data ext4 rw
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mount_or_panic --bind /newroot/data/var /newroot/var
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mount_or_panic -t overlay overlay \
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-o lowerdir=/newroot/etc,upperdir=/newroot/data/etc-overlay/upper,workdir=/newroot/data/etc-overlay/work \
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/newroot/etc
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mount_or_panic --move /dev /newroot/dev
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mount_or_panic --move /proc /newroot/proc
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mount_or_panic --move /sys /newroot/sys
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mount_or_panic --move /run /newroot/run
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log "Switching root to $ROOT_DEV"
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exec switch_root /newroot /sbin/init
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panic "switch_root returned unexpectedly"
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