add block-extroot, a package for using an external filesystem as rootfs (patch by...

[openwrt/svn-archive/archive.git] / package / block-extroot / files / 50_determine_usb_root

diff --git a/package/block-extroot/files/50_determine_usb_root b/package/block-extroot/files/50_determine_usb_root
new file mode 100644 (file)
index 0000000..1e5f153
--- /dev/null
+++ b/package/block-extroot/files/50_determine_usb_root
@@ -0,0 +1,50 @@
+#!/bin/sh
+# Copyright (C) 2010 Vertical Communications
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+
+
+. /etc/functions.sh
+. /lib/functions/extmount.sh
+. /lib/functions/mount.sh
+
+determine_external_root() {
+       local OLD_UCI_CONFIG_DIR="$UCI_CONFIG_DIR"
+       set_jffs_mp
+       determine_root_device
+
+       # extroot requires extroot and fstab config files, therefore 
+       # we assume configuration is incomplete and not to be used if either of them
+       # is missing (for jffs versions of these files on squashfs image)
+       if [ "$jffs" = "/jffs" ] && [ -r "/jffs/etc/config/fstab" ]; then
+               UCI_CONFIG_DIR="/jffs/etc/config"
+               ER_IS_SQUASHFS=true
+       fi
+
+       # For squashfs on firstboot root_device will be tmpfs for the ramoverlay,
+       # unless there is a saved config, in which case it will be /dev/root,
+       # however in the case of a saved config, it won't be restored until after
+       # this script, so there won't be a config on the first boot after
+       # flashing a squashfs-based filesystem
+       # For ext2, ramdisk, or jffs2 root filesystems root_device is /dev/root
+       # For squashfs after firstboot, root filesystem is /dev/root    
+       # We only use the config from the root or jffs if the root_device is 
+       # /dev/root
+       [ "$root_device" = "/dev/root" ] && {
+               er_load_modules
+               [ -n "$extroot_settle_time" ] && [ "$extroot_settle_time" -gt 0 ] && {
+                       sleep $extroot_settle_time
+               } 
+               config_load fstab
+               config_foreach config_mount_by_section mount 1
+               
+               [ "$rootfs_found" = "1" ] && grep -q /overlay /proc/mounts && { 
+                       pi_extroot_mount_success=true
+                       pi_mount_skip_next=false
+               }
+       }
+       UCI_CONFIG_DIR="$OLD_UCI_CONFIG_DIR"
+}
+
+boot_hook_add preinit_mount_root determine_external_root
+