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="$UCI_CONFIG_DIR"
  12         local OLD_PATH="$PATH"
  13         local OLD_LD_LIBRARY_PATH="$LD_LIBRARY_PATH"
  14         set_jffs_mp
  15         determine_root_device
  16
  17         # extroot requires extroot and fstab config files, therefore
  18         # we assume configuration is incomplete and not to be used if either of them
  19         # is missing (for jffs versions of these files on squashfs image)
  20         if [ "$jffs" = "/tmp/overlay" ] && [ -r "/tmp/overlay/etc/config/fstab" ]; then
  21                 UCI_CONFIG_DIR="/tmp/overlay/etc/config"
  22                 ER_IS_SQUASHFS=true
  23                 ER_OVERLAY_PREFIX="/tmp/overlay"
  24                 PATH=$ER_OVERLAY_PREFIX/sbin:$PATH
  25                 LD_LIBRARY_PATH=$ER_OVERLAY_PREFIX/usr/lib:$LD_LIBRARY_PATH
  26                 export PATH LD_LIBRARY_PATH
  27         fi
  28
  29         # For squashfs on firstboot root_device will be tmpfs for the ramoverlay,
  30         # unless there is a saved config, in which case it will be /dev/root,
  31         # however in the case of a saved config, it won't be restored until after
  32         # this script, so there won't be a config on the first boot after
  33         # flashing a squashfs-based filesystem
  34         # For ext2, ramdisk, or jffs2 root filesystems root_device is /dev/root
  35         # For squashfs after firstboot, root filesystem is /dev/root
  36         # We only use the config from the root or jffs if the root_device is
  37         # /dev/root
  38         [ "$root_device" = "/dev/root" ] && {
  39                 er_load_modules
  40                 [ -n "$extroot_settle_time" ] && [ "$extroot_settle_time" -gt 0 ] && {
  41                         sleep $extroot_settle_time
  42                 }
  43                 config_load fstab
  44                 config_foreach config_mount_by_section mount 1
  45                 ER_OVERLAY_ROM="/no-extroot"
  46
  47                 [ "$rootfs_found" = "1" ] && grep -q ' /overlay ' /proc/mounts && {
  48                         pi_extroot_mount_success=true
  49                         pi_mount_skip_next=false
  50                         ER_OVERLAY_ROM="/overlay"
  51                 }
  52                 [ "$rootfs_found" = "1" ] && grep -q ' /rom ' /proc/mounts && {
  53                         pi_extroot_mount_success=true
  54                         pi_mount_skip_next=false
  55                         ER_OVERLAY_ROM="/rom"
  56                 }
  57         }
  58         UCI_CONFIG_DIR="$OLD_UCI_CONFIG_DIR"
  59         PATH="$OLD_PATH"
  60         LD_LIBRARY_PATH="$OLD_LD_LIBRARY_PATH"
  61         export PATH LD_LIBRARY_PATH
  62 }
  63
  64 boot_hook_add preinit_mount_root determine_external_root
  65