void-packages/xbps-src/libexec/chroot-helper.sh.in

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#!/bin/sh
#-
# Copyright (c) 2010-2011 Juan Romero Pardines.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#-
HANDLER="$1"
REQFS="sys proc dev xbps host"
mount_chroot_fs()
{
local cnt f blah dowrite
for f in ${REQFS}; do
if [ ! -f ${MASTERDIR}/.${f}_mount_bind_done ]; then
unset dowrite
echo -n "=> Mounting /${f} in chroot... "
if [ ! -d ${MASTERDIR}/${f} ]; then
mkdir -p ${MASTERDIR}/${f}
fi
case ${f} in
xbps)
blah=${DISTRIBUTIONDIR}
dowrite="-w"
;;
host)
blah=${HOSTDIR}
dowrite="-w"
;;
*) blah=/${f};;
esac
if [ -z "$HOSTDIR" -a "$f" = "host" ]; then
echo "unset, ignoring."
continue
fi
[ ! -d ${blah} ] && echo "failed." && continue
@@XBPS_INSTALL_LIBEXECDIR@@/capmount \
${dowrite} ${blah} ${MASTERDIR}/${f} \
2>/dev/null
if [ $? -eq 0 ]; then
echo 1 > ${MASTERDIR}/.${f}_mount_bind_done
echo "done."
else
echo "FAILED!"
exit 1
fi
else
cnt=$(cat ${MASTERDIR}/.${f}_mount_bind_done)
cnt=$((${cnt} + 1))
echo ${cnt} > ${MASTERDIR}/.${f}_mount_bind_done
fi
done
}
umount_chroot_fs()
{
local fs dir cnt
for fs in ${REQFS}; do
[ ! -f ${MASTERDIR}/.${fs}_mount_bind_done ] && continue
cnt=$(cat ${MASTERDIR}/.${fs}_mount_bind_done)
if [ ${cnt} -gt 1 ]; then
cnt=$((${cnt} - 1))
echo ${cnt} > ${MASTERDIR}/.${fs}_mount_bind_done
else
echo -n "=> Unmounting ${fs} from chroot... "
@@XBPS_INSTALL_LIBEXECDIR@@/capumount \
${MASTERDIR} ${fs} 2>/dev/null
if [ $? -eq 0 ]; then
rm -f ${MASTERDIR}/.${fs}_mount_bind_done
echo "done."
else
echo "FAILED!!!"
fi
fi
unset fs
done
}
if [ $# -ne 1 ]; then
echo "$0: mount || umount"
exit 1
fi
if [ -z "$MASTERDIR" -o -z "$DISTRIBUTIONDIR" ]; then
echo "$0: MASTERDIR or DISTRIBUTIONDIR unset, can't continue."
exit 1
fi
case "${HANDLER}" in
mount) mount_chroot_fs;;
umount) umount_chroot_fs;;
*) echo "$0: invalid target." && exit 1;;
esac
exit 0