Your Name
113 lines
3.1 KiB
Bash
113 lines
3.1 KiB
Bash
#!/bin/sh
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kgetopt ()
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{
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_cmdline="$(cat /proc/cmdline)"
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_optname="$1"
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_optval="$2"
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for _opt in $_cmdline
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do
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case "$_opt" in
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"${_optname}"=*)
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_optval="${_opt##"${_optname}"=}"
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;;
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*)
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;;
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esac
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done
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[ -n "$_optval" ] && echo "$_optval"
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}
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fslist="proc sys dev run"
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rodir=/mnt/rofs
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mmcdev="/dev/mmcblk0"
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rwfsdev="/dev/disk/by-partlabel/rwfs"
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cd /
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# We want to make all the directories in $fslist, not one directory named by
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# concatonating the names with spaces
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#
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# shellcheck disable=SC2086
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mkdir -p $fslist
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mount dev dev -tdevtmpfs
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mount sys sys -tsysfs
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mount proc proc -tproc
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mount tmpfs run -t tmpfs -o mode=755,nodev
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# Wait up to 5s for the mmc device to appear. Continue even if the count is
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# exceeded. A failure will be caught later like in the mount command.
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count=0
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while [ $count -lt 5 ]; do
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if [ -e "${mmcdev}" ]; then
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break
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fi
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sleep 1
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count=$((count + 1))
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done
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# Move the secondary GPT to the end of the device if needed. Look for the GPT
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# header signature "EFI PART" located 512 bytes from the end of the device.
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if ! tail -c 512 "${mmcdev}" | hexdump -C -n 8 | grep -q "EFI PART"; then
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sgdisk -e "${mmcdev}"
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partprobe
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fi
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# There eMMC GPT labels for the rootfs are rofs-a and rofs-b, and the label for
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# the read-write partition is rwfs. Run udev to make the partition labels show
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# up. Mounting by label allows for partition numbers to change if needed.
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udevd --daemon
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udevadm trigger --type=devices --action=add
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udevadm settle --timeout=10
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mkdir -p $rodir
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if ! mount /dev/disk/by-partlabel/"$(kgetopt root=PARTLABEL)" $rodir -t ext4 -o ro; then
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/bin/sh
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fi
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# Determine if a factory reset has been requested
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mkdir -p /var/lock
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resetval=$(fw_printenv -n rwreset 2>/dev/null)
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if gpiopresent=$(gpiofind factory-reset-toggle) ; then
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# gpiopresent contains both the gpiochip and line number as
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# separate words, and gpioget needs to see them as such.
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# shellcheck disable=SC2086
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gpioval=$(gpioget $gpiopresent)
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else
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gpioval=""
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fi
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# Prevent unnecessary resets on first boot
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if [ -n "$gpioval" ] && [ -z "$resetval" ]; then
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fw_setenv rwreset "$gpioval"
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resetval=$gpioval
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fi
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if [ "$resetval" = "true" ] || [ -n "$gpioval" ] && [ "$resetval" != "$gpioval" ]; then
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echo "Factory reset requested."
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if ! mkfs.ext4 -F "${rwfsdev}"; then
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echo "Reformat for factory reset failed."
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/bin/sh
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else
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# gpioval will be an empty string if factory-reset-toggle was not found
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fw_setenv rwreset "$gpioval"
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echo "rwfs has been formatted."
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fi
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fi
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fsck.ext4 -p "${rwfsdev}"
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if ! mount "${rwfsdev}" $rodir/var -t ext4 -o rw; then
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/bin/sh
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fi
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rm -rf $rodir/var/persist/etc-work/
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mkdir -p $rodir/var/persist/etc $rodir/var/persist/etc-work $rodir/var/persist/home/root
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mount overlay $rodir/etc -t overlay -o lowerdir=$rodir/etc,upperdir=$rodir/var/persist/etc,workdir=$rodir/var/persist/etc-work
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init="$(kgetopt init /sbin/init)"
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for f in $fslist; do
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mount --move "$f" "$rodir/$f"
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done
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exec switch_root $rodir "$init"
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