package/base-files/files/lib/preinit/80_mount_root

   1 # Copyright (C) 2006 OpenWrt.org
   2 # Copyright (C) 2010 Vertical Communications
   3
   4 missing_lines() {
   5         local file1 file2 line
   6         file1="$1"
   7         file2="$2"
   8         oIFS="$IFS"
   9         IFS=":"
  10         while read line; do
  11                 set -- $line
  12                 grep -q "^$1:" "$file2" || echo "$*"
  13         done < "$file1"
  14         IFS="$oIFS"
  15 }
  16
  17 # Rootfs mount options can be passed by declaring in the kernel
  18 # cmdline as much options as needed prefixed with "rootfs_mount_options."
  19 #
  20 # Example:
  21 # rootfs_mount_options.compress_algorithm=zstd rootfs_mount_options.noinline_data
  22 #
  23 compose_rootfs_mount_options() {
  24         local mount_options
  25         local cmdlinevar
  26
  27         for cmdlinevar in $(cat /proc/cmdline); do
  28                 if [ "$cmdlinevar" != "${cmdlinevar#rootfs_mount_options\.}" ]; then
  29                         append mount_options "${cmdlinevar#rootfs_mount_options\.}"
  30                 fi
  31         done
  32
  33         echo $mount_options
  34 }
  35
  36 do_mount_root() {
  37         mount_root start "$(compose_rootfs_mount_options)"
  38         boot_run_hook preinit_mount_root
  39         [ -f /sysupgrade.tgz -o -f /tmp/sysupgrade.tar ] && {
  40                 echo "- config restore -"
  41                 cp /etc/passwd /etc/group /etc/shadow /tmp
  42                 cd /
  43                 [ -f /sysupgrade.tgz ] && tar xzf /sysupgrade.tgz
  44                 [ -f /tmp/sysupgrade.tar ] && tar xf /tmp/sysupgrade.tar
  45                 missing_lines /tmp/passwd /etc/passwd >> /etc/passwd
  46                 missing_lines /tmp/group /etc/group >> /etc/group
  47                 missing_lines /tmp/shadow /etc/shadow >> /etc/shadow
  48                 rm /tmp/passwd /tmp/group /tmp/shadow
  49                 # Prevent configuration corruption on a power loss
  50                 sync
  51         }
  52 }
  53
  54 [ "$INITRAMFS" = "1" ] || boot_hook_add preinit_main do_mount_root