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

   1 #!/bin/sh
   2
   3 #set -x
   4
   5 ROOTMOUNTPT=/media/realroot
   6 REALMOUNT=/bin/mount.busybox
   7 UNIONMOUNT=$0
   8 INCDIRS="^/media/\|^/mnt/"
   9 DEVICE="\/dev\/"
  10
  11 newargs=""
  12
  13 ONESHIFTARGS='aVhvfFilnsrw'
  14 TWOSHIFTARGS="pLUtOo"
  15 IGNOREARGS='--bind --move'
  16
  17 resolvelink () {
  18         if test -h $1; then
  19                 echo `readlink $1`
  20         else
  21                 echo $1
  22         fi
  23 }
  24
  25 # Retrieves arguments/mount-point
  26 for var in $@; do
  27         if [ -z "$SKIP" ]; then
  28                 if echo $var | grep -q "^-.*"; then
  29                         # argument is an option
  30                         if echo $var | grep -q "[$TWOSHIFTARGS]"; then
  31                                 SKIP="yes"
  32                         fi
  33                         # mount -a
  34                         if echo $var | grep -q "^-[^- ]*a"; then
  35                                 DO_FSTAB="yes"
  36                         fi
  37                         ARGS="$ARGS $var"
  38                 else
  39                         if [ -z "$MOUNT_POINT" ]; then
  40                                 # argument apears to be the mountpoint
  41                                 MOUNT_POINT=$var
  42                         else
  43                                 # A mountpoint was found earlier, so the other non-option
  44                                 # must be the real mountpoint, and the first non-option is a device
  45                                 DEV_PATH="$MOUNT_POINT"
  46                                 MOUNT_POINT="$var"
  47                         fi
  48                 fi
  49         else
  50                 ARGS="$ARGS $var"
  51                 unset SKIP
  52         fi
  53 done
  54
  55 # Parse fstab if -a is used
  56 if ! [ -z "$DO_FSTAB" ]; then
  57         # FIXME: This doesn't handle -t or -O
  58         awk '/^[^ #]/ {print "-t " $3 " -o " $4 " " $1 " " $2}' /etc/fstab |
  59         while read line; do
  60                 ${UNIONMOUNT} $line
  61         done
  62         exit 0
  63 fi
  64
  65 # Get mount-point for device name, if device name is given
  66 if echo "$MOUNT_POINT" | grep -q "^${DEVICE}"; then
  67         MOUNT_POINT_TEMP=`echo $MOUNT_POINT | sed -e "s/\//\\\\\\\\\//g"`
  68         NEW_MOUNT_POINT=`awk "/$MOUNT_POINT_TEMP/ {print "'$2'"}" /etc/fstab`
  69         if ! [ -z "$NEW_MOUNT_POINT" ]; then
  70                 MOUNT_POINT=$NEW_MOUNT_POINT
  71         fi
  72 fi
  73
  74 # Mount anything but /media/* and / with the real mount
  75 if ! (echo "$MOUNT_POINT" | grep -q "$INCDIRS" || [ "$MOUNT_POINT" = "/" ]); then
  76         exec ${REALMOUNT} $@
  77 fi
  78
  79 # Replace requests to mount '/' (from init scripts and such)
  80 # with mount ROOTMOUNTPT (the real-root mount point for the
  81 # unionfs'd system).
  82 packagedir=""
  83 if ([ "$MOUNT_POINT" = "/" ] || [ "$MOUNT_POINT" = "${ROOTMOUNTPT}" ]); then
  84         MOUNT_POINT=${ROOTMOUNTPT}
  85 else
  86         # FIXME: A hard-coded path is bad - see ipkg-link
  87         PACKAGE_DIR="/packages"
  88         x=a
  89 fi
  90
  91 # Finally, mount and union-mount
  92 #echo "<<DEBUG>> Running command: [${REALMOUNT} $ARGS $DEV_PATH $MOUNT_POINT]"
  93 if ${REALMOUNT} $ARGS $DEV_PATH $MOUNT_POINT; then
  94         if mkdir -p $MOUNT_POINT$PACKAGE_DIR; then
  95                 #echo "<<DEBUG>> Running command: [unionctl /. --add --after ${ROOTMOUNTPT} --mode rw `resolvelink $MOUNT_POINT`$PACKAGE_DIR]"
  96                 #unionctl /. --add --after ${ROOTMOUNTPT} --mode rw `resolvelink $MOUNT_POINT`$PACKAGE_DIR
  97                 unionctl /. --add `resolvelink $MOUNT_POINT`$PACKAGE_DIR
  98         fi
  99 fi