| 1 | #!/bin/sh |
| 2 | # Copyright (C) 2010 Daniel Dickinson |
| 3 | # This is free software, licensed under the GNU General Public License v2. |
| 4 | # See /LICENSE for more information. |
| 5 | |
| 6 | |
| 7 | check_set_md5sum() { |
| 8 | local er_md5sum_file |
| 9 | er_md5sum_file="${ER_OVERLAY_PREFIX}/.extroot.md5sum" |
| 10 | |
| 11 | local er_extroot_md5sum |
| 12 | if [ -f $md5sum_file ]; then |
| 13 | er_extroot_md5sum="$(cat $er_md5sum_file)" |
| 14 | fi |
| 15 | |
| 16 | local er_overlay_file="/overlay/etc/extroot.md5sum" |
| 17 | |
| 18 | local er_extroot_overlay_md5sum |
| 19 | if [ -f "$er_overlay_file" ]; then |
| 20 | er_extroot_overlay_md5sum="$(cat $er_overlay_file)" |
| 21 | fi |
| 22 | |
| 23 | if [ -z "$er_extroot_overlay_md5sum" ]; then |
| 24 | cat $er_md5sum_file >$er_overlay_file |
| 25 | elif [ "$er_extroot_overlay_md5sum" != "$er_extroot_md5sum" ]; then |
| 26 | pi_extroot_mount_success="false" |
| 27 | mkdir -p /tmp/overlay-disabled |
| 28 | mount --move /overlay /tmp/overlay-disabled |
| 29 | fi |
| 30 | } |
| 31 | |
| 32 | set_jffs_md5sum() { |
| 33 | # We do this anytime block-extroot exists, even on the first boot with |
| 34 | # no extroot defined. |
| 35 | |
| 36 | local er_md5sum_file |
| 37 | er_md5sum_file="${ER_OVERLAY_PREFIX}/.extroot.md5sum" |
| 38 | |
| 39 | local er_extroot_md5sum |
| 40 | if [ -f $er_md5sum_file ]; then |
| 41 | er_extroot_md5sum="$(cat $er_md5sum_file)" |
| 42 | fi |
| 43 | if [ -z "$er_extroot_md5sum" ]; then |
| 44 | dd if=/dev/urandom count=32 bs=1k 2>/dev/null | md5sum | cut -f1 -d\ >$er_md5sum_file |
| 45 | fi |
| 46 | } |
| 47 | |
| 48 | determine_extroot_sysupgrade() { |
| 49 | check_skip || set_jffs_md5sum |
| 50 | |
| 51 | check_skip || [ "$pi_extroot_mount_success" != "true" ] || { |
| 52 | check_set_md5sum |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | boot_hook_add preinit_mount_root determine_extroot_sysupgrade |
| 57 | |
| 58 | |
