package/block-mount/files/50_determine_usb_root

   1 #!/bin/sh
   2 # Copyright (C) 2010 Vertical Communications
   3 # This is free software, licensed under the GNU General Public License v2.
   4 # See /LICENSE for more information.
   5
   6
   7 determine_external_root() {
   8         pi_include /lib/functions/extmount.sh
   9         pi_include /lib/functions/mount.sh
  10
  11         local OLD_UCI_CONFIG_DIR="$UCI_CONFIG_DIR"
  12         set_jffs_mp
  13         determine_root_device
  14
  15         # extroot requires extroot and fstab config files, therefore
  16         # we assume configuration is incomplete and not to be used if either of them
  17         # is missing (for jffs versions of these files on squashfs image)
  18         if [ "$jffs" = "/tmp/overlay" ] && [ -r "/tmp/overlay/etc/config/fstab" ]; then
  19                 UCI_CONFIG_DIR="/tmp/overlay/etc/config"
  20                 ER_IS_SQUASHFS=true
  21                 ER_OVERLAY_PREFIX="/tmp/overlay"
  22         fi
  23
  24         # For squashfs on firstboot root_device will be tmpfs for the ramoverlay,
  25         # unless there is a saved config, in which case it will be /dev/root,
  26         # however in the case of a saved config, it won't be restored until after
  27         # this script, so there won't be a config on the first boot after
  28         # flashing a squashfs-based filesystem
  29         # For ext2, ramdisk, or jffs2 root filesystems root_device is /dev/root
  30         # For squashfs after firstboot, root filesystem is /dev/root
  31         # We only use the config from the root or jffs if the root_device is
  32         # /dev/root
  33         [ "$root_device" = "/dev/root" ] && {
  34                 er_load_modules
  35                 [ -n "$extroot_settle_time" ] && [ "$extroot_settle_time" -gt 0 ] && {
  36                         sleep $extroot_settle_time
  37                 }
  38                 config_load fstab
  39                 config_foreach config_mount_by_section mount 1
  40                 ER_OVERLAY_ROM="/no-extroot"
  41
  42                 [ "$rootfs_found" = "1" ] && grep -q ' /overlay ' /proc/mounts && {
  43                         pi_extroot_mount_success=true
  44                         pi_mount_skip_next=false
  45                         ER_OVERLAY_ROM="/overlay"
  46                 }
  47                 [ "$rootfs_found" = "1" ] && grep -q ' /rom ' /proc/mounts && {
  48                         pi_extroot_mount_success=true
  49                         pi_mount_skip_next=false
  50                         ER_OVERLAY_ROM="/rom"
  51                 }
  52         }
  53         UCI_CONFIG_DIR="$OLD_UCI_CONFIG_DIR"
  54 }
  55
  56 boot_hook_add preinit_mount_root determine_external_root
  57