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#!/bin/sh
#set -x
ROOTMOUNTPT=/media/realroot
REALUMOUNT=/bin/umount.busybox
UNIONUMOUNT=$0
INCDIRS="^/media/\|^/mnt/"
DEVICE="\/dev\/"
newargs=""
ONESHIFTARGS='adflnrv'
TWOSHIFTARGS="tO"
resolvelink () {
if test -h $1; then
echo `readlink $1`
else
echo $1
fi
}
# Retrieves arguments/mount-point
for var in $@; do
if [ -z "$SKIP" ]; then
if echo $var | grep -q "^-.*"; then
if echo $var | grep -q "[$TWOSHIFTARGS]"; then
SKIP="yes"
fi
if echo $var | grep -q "^-[^- ]*a"; then
DO_FSTAB="yes"
fi
ARGS="$ARGS $var"
else
if [ -z "$MOUNT_POINT" ]; then
MOUNT_POINT=$var
else
# This really shouldn't happen when unmounting
DEV_PATH="$MOUNT_POINT"
MOUNT_POINT="$var"
fi
fi
else
ARGS="$ARGS $var"
unset SKIP
fi
done
# Parse fstab if -a is used
if ! [ -z "$DO_FSTAB" ]; then
# FIXME: This doesn't handle -t or -O
awk '/^[^ #]/ {print $1}' /etc/fstab |
while read line; do
${UNIONUMOUNT} $line
done
exit 0
fi
# Get mount-point for device name, if device name is given
if echo "$MOUNT_POINT" | grep -q "^${DEVICE}"; then
MOUNT_POINT_TEMP=`echo $MOUNT_POINT | sed -e "s/\//\\\\\\\\\//g"`
NEW_MOUNT_POINT=`awk "/$MOUNT_POINT_TEMP/ {print "'$2'"}" /etc/fstab`
if ! [ -z "$NEW_MOUNT_POINT" ]; then
MOUNT_POINT=$NEW_MOUNT_POINT
fi
fi
if ! (echo "$MOUNT_POINT" | grep -q "$INCDIRS"||[ "$MOUNT_POINT" = "/" ]); then
exec ${REALMOUNT} $@
fi
# Replace requests to mount '/' (from init scripts and such)
# with mount ROOTMOUNTPT (the real-root mount point for the
# unionfs'd system).
packagedir=""
if ([ "$MOUNT_POINT" = "/" ]||[ "$MOUNT_POINT" = "${ROOTMOUNTPT}" ]); then
MOUNT_POINT=${ROOTMOUNTPT}
else
PACKAGE_DIR="/packages"
fi
# Finally, umount and union-umount
unionctl /. --remove `resolvelink $MOUNT_POINT`$PACKAGE_DIR
exec ${REALUMOUNT} $ARGS $MOUNT_POINT
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