org.handhelds.familiar/packages/unionfs/unionroot-utils/umount.unionroot

   1 #!/bin/sh
   2
   3 #set -x
   4
   5 ROOTMOUNTPT=/media/realroot
   6 REALUMOUNT=/bin/umount.busybox
   7 UNIONUMOUNT=$0
   8 INCDIRS="^/media/\|^/mnt/"
   9 DEVICE="\/dev\/"
  10
  11 newargs=""
  12
  13 ONESHIFTARGS='adflnrv'
  14 TWOSHIFTARGS="tO"
  15
  16 resolvelink () {
  17         if test -h $1; then
  18                 echo `readlink $1`
  19         else
  20                 echo $1
  21         fi
  22 }
  23
  24 # Retrieves arguments/mount-point
  25 for var in $@; do
  26         if [ -z "$SKIP" ]; then
  27                 if echo $var | grep -q "^-.*"; then
  28                         if echo $var | grep -q "[$TWOSHIFTARGS]"; then
  29                                 SKIP="yes"
  30                         fi
  31                         if echo $var | grep -q "^-[^- ]*a"; then
  32                                 DO_FSTAB="yes"
  33                         fi
  34                         ARGS="$ARGS $var"
  35                 else
  36                         if [ -z "$MOUNT_POINT" ]; then
  37                                 MOUNT_POINT=$var
  38                         else
  39                                 # This really shouldn't happen when unmounting
  40                                 DEV_PATH="$MOUNT_POINT"
  41                                 MOUNT_POINT="$var"
  42                         fi
  43                 fi
  44         else
  45                 ARGS="$ARGS $var"
  46                 unset SKIP
  47         fi
  48 done
  49
  50 # Parse fstab if -a is used
  51 if ! [ -z "$DO_FSTAB" ]; then
  52         # FIXME: This doesn't handle -t or -O
  53         awk '/^[^ #]/ {print $1}' /etc/fstab |
  54         while read line; do
  55                 ${UNIONUMOUNT} $line
  56         done
  57         exit 0
  58 fi
  59
  60 # Get mount-point for device name, if device name is given
  61 if echo "$MOUNT_POINT" | grep -q "^${DEVICE}"; then
  62         MOUNT_POINT_TEMP=`echo $MOUNT_POINT | sed -e "s/\//\\\\\\\\\//g"`
  63         NEW_MOUNT_POINT=`awk "/$MOUNT_POINT_TEMP/ {print "'$2'"}" /etc/fstab`
  64         if ! [ -z "$NEW_MOUNT_POINT" ]; then
  65                 MOUNT_POINT=$NEW_MOUNT_POINT
  66         fi
  67 fi
  68
  69 if ! (echo "$MOUNT_POINT" | grep -q "$INCDIRS"||[ "$MOUNT_POINT" = "/" ]); then
  70         exec ${REALMOUNT} $@
  71 fi
  72
  73 # Replace requests to mount '/' (from init scripts and such)
  74 # with mount ROOTMOUNTPT (the real-root mount point for the
  75 # unionfs'd system).
  76 packagedir=""
  77 if ([ "$MOUNT_POINT" = "/" ]||[ "$MOUNT_POINT" = "${ROOTMOUNTPT}" ]); then
  78         MOUNT_POINT=${ROOTMOUNTPT}
  79 else
  80         PACKAGE_DIR="/packages"
  81 fi
  82
  83 # Finally, umount and union-umount
  84 unionctl /. --remove `resolvelink $MOUNT_POINT`$PACKAGE_DIR
  85 exec ${REALUMOUNT} $ARGS $MOUNT_POINT
  86