Adriana Kobylak | 0998d1e | 2020-06-03 16:22:42 -0500 | [diff] [blame] | 1 | #!/bin/sh |
| 2 | |
| 3 | # Get the value of the root env variable found in /proc/cmdline |
| 4 | get_root() { |
| 5 | local root="$(cat /proc/cmdline)" |
| 6 | root="${root##* root=PARTLABEL=}" |
| 7 | root="${root%% *}" |
| 8 | [ "${root}" != "" ] && echo "${root}" |
| 9 | } |
| 10 | |
| 11 | fslist="proc sys dev run" |
| 12 | rodir=/mnt/rofs |
Isaac Kurth | 5003195 | 2021-09-07 22:04:14 +0000 | [diff] [blame^] | 13 | mmcdev="/dev/mmcblk0" |
| 14 | rwfsdev="/dev/disk/by-partlabel/rwfs" |
| 15 | |
Adriana Kobylak | 0998d1e | 2020-06-03 16:22:42 -0500 | [diff] [blame] | 16 | cd / |
| 17 | mkdir -p $fslist |
| 18 | mount dev dev -tdevtmpfs |
| 19 | mount sys sys -tsysfs |
| 20 | mount proc proc -tproc |
| 21 | mount tmpfs run -t tmpfs -o mode=755,nodev |
| 22 | |
Adriana Kobylak | 331a369 | 2020-08-17 12:40:23 -0500 | [diff] [blame] | 23 | # Wait up to 5s for the mmc device to appear. Continue even if the count is |
| 24 | # exceeded. A failure will be caught later like in the mount command. |
Adriana Kobylak | 331a369 | 2020-08-17 12:40:23 -0500 | [diff] [blame] | 25 | count=0 |
| 26 | while [ $count -lt 5 ]; do |
| 27 | if [ -e "${mmcdev}" ]; then |
| 28 | break |
| 29 | fi |
| 30 | sleep 1 |
| 31 | count=$((count + 1)) |
| 32 | done |
| 33 | |
Adriana Kobylak | 0998d1e | 2020-06-03 16:22:42 -0500 | [diff] [blame] | 34 | # Move the secondary GPT to the end of the device if needed. Look for the GPT |
| 35 | # header signature "EFI PART" located 512 bytes from the end of the device. |
Andrew Jeffery | 9e08ff4 | 2021-04-01 22:28:43 +1030 | [diff] [blame] | 36 | if ! tail -c 512 "${mmcdev}" | hexdump -C -n 8 | grep -q "EFI PART"; then |
Adriana Kobylak | 331a369 | 2020-08-17 12:40:23 -0500 | [diff] [blame] | 37 | sgdisk -e "${mmcdev}" |
Adriana Kobylak | 0998d1e | 2020-06-03 16:22:42 -0500 | [diff] [blame] | 38 | partprobe |
| 39 | fi |
| 40 | |
| 41 | # There eMMC GPT labels for the rootfs are rofs-a and rofs-b, and the label for |
| 42 | # the read-write partition is rwfs. Run udev to make the partition labels show |
| 43 | # up. Mounting by label allows for partition numbers to change if needed. |
| 44 | udevd --daemon |
| 45 | udevadm trigger --type=devices --action=add |
| 46 | udevadm settle --timeout=10 |
| 47 | |
| 48 | mkdir -p $rodir |
| 49 | if ! mount /dev/disk/by-partlabel/"$(get_root)" $rodir -t ext4 -o ro; then |
| 50 | /bin/sh |
| 51 | fi |
Adriana Kobylak | 1f6ac83 | 2020-08-24 15:20:04 -0500 | [diff] [blame] | 52 | |
Isaac Kurth | 5003195 | 2021-09-07 22:04:14 +0000 | [diff] [blame^] | 53 | # Determine if a factory reset has been requested |
Isaac Kurth | 315698e | 2021-06-25 11:33:46 -0500 | [diff] [blame] | 54 | mkdir -p /var/lock |
Isaac Kurth | 5003195 | 2021-09-07 22:04:14 +0000 | [diff] [blame^] | 55 | resetval=$(fw_printenv -n rwreset 2>/dev/null) |
| 56 | gpiopresent=$(gpiofind factory-reset-toggle) |
| 57 | if [ $? -eq 0 ]; then |
| 58 | gpioval=$(gpioget $gpiopresent) |
| 59 | else |
| 60 | gpioval="" |
| 61 | fi |
| 62 | # Prevent unnecessary resets on first boot |
| 63 | if [ -n "$gpioval" -a -z "$resetval" ]; then |
| 64 | fw_setenv rwreset $gpioval |
| 65 | resetval=$gpioval |
| 66 | fi |
| 67 | if [ "$resetval" = "true" -o -n "$gpioval" -a "$resetval" != "$gpioval" ]; then |
Isaac Kurth | 315698e | 2021-06-25 11:33:46 -0500 | [diff] [blame] | 68 | echo "Factory reset requested." |
| 69 | if ! mkfs.ext4 -F "${rwfsdev}"; then |
| 70 | echo "Reformat for factory reset failed." |
| 71 | /bin/sh |
| 72 | else |
Isaac Kurth | 5003195 | 2021-09-07 22:04:14 +0000 | [diff] [blame^] | 73 | # gpioval will be an empty string if factory-reset-toggle was not found |
| 74 | fw_setenv rwreset $gpioval |
| 75 | echo "rwfs has been formatted." |
Isaac Kurth | 315698e | 2021-06-25 11:33:46 -0500 | [diff] [blame] | 76 | fi |
| 77 | fi |
| 78 | |
Adriana Kobylak | 1f6ac83 | 2020-08-24 15:20:04 -0500 | [diff] [blame] | 79 | fsck.ext4 -p "${rwfsdev}" |
| 80 | if ! mount "${rwfsdev}" $rodir/var -t ext4 -o rw; then |
Adriana Kobylak | 0998d1e | 2020-06-03 16:22:42 -0500 | [diff] [blame] | 81 | /bin/sh |
| 82 | fi |
| 83 | |
| 84 | rm -rf $rodir/var/persist/etc-work/ |
| 85 | mkdir -p $rodir/var/persist/etc $rodir/var/persist/etc-work $rodir/var/persist/home/root |
| 86 | mount overlay $rodir/etc -t overlay -o lowerdir=$rodir/etc,upperdir=$rodir/var/persist/etc,workdir=$rodir/var/persist/etc-work |
| 87 | |
| 88 | for f in $fslist; do |
| 89 | mount --move $f $rodir/$f |
| 90 | done |
| 91 | |
Andrew Jeffery | b5cbe9b | 2021-04-01 22:36:14 +1030 | [diff] [blame] | 92 | exec switch_root $rodir /sbin/init |