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|
#!/bin/sh
# Copyright © 2005-2009 Roger Leigh <rleigh@debian.org>
# Copyright © 2009 Jan-Marek Glogowski <glogow@fbihome.de>
#
# schroot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# schroot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################
set -e
. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"
. "$SETUP_DATA_DIR/common-config"
# Mount a filesystem
# $1: mount options
# $2: mount device
# $3: mount location
do_mount()
{
info "Mounting $2 on $3"
if [ -h "$3" ]; then
fatal "$3 is a symbolic link, not usable as a mountpoint"
fi
if [ ! -d "$3" ]; then
mkdir -p "$3"
fi
if [ ! -d "$3" ]; then
fatal "$3 does not exist, and could not be created"
fi
info "$MOUNT_VERBOSE $1 $2 $3"
mount $MOUNT_VERBOSE $1 "$2" "$3"
}
# Unmount all filesystems under specified location
# $1: mount base location
do_umount_all()
{
if [ -d "$1" ]; then
# Note that flock is used here to prevent races reading
# /proc/mounts, which on current (Linux 2.6.32) kernels is
# racy. If other processes are mounting or unmounting
# filesystems as we read it, we can miss mount entries due to
# the file changing as we read it. This needs fixing in the
# kernel, but an exclusive lock surrounding the
# schroot-listmounts invocation is a partial fix. This
# prevents racing when multiple schroot processes are running.
# Note that this does not prevent the problem when programs
# other than schroot mount and unmount filesystems (since they
# don't create the lock).
if [ -e /var/lock/schroot ]; then
if [ ! -d /var/lock/schroot ]; then
error "/var/lock/schroot is not a directory"
exit 1
fi
else
mkdir -m 0700 /var/lock/schroot
fi
if [ "$(stat -c "%u %g %a" /var/lock/schroot)" != "0 0 700" ]; then
error "/var/lock/schroot is not owned by root:root, or lacks 0700 permissions"
exit 1
fi
( flock 9
mounts="$("$LIBEXEC_DIR/schroot-listmounts" -m "$1")"
if [ "x$mounts" != 'x' ]; then
echo "$mounts" |
while read mountloc; do
info "Unmounting $mountloc"
umount "$mountloc" || exit 1
done || exit 1
fi
) 9>"/var/lock/schroot/umount"
else
warn "Mount location $1 no longer exists; skipping unmount"
fi
}
# Mount a filesystem union
# $1: the mount location
do_mount_fs_union()
{
# Prepare mount options (branch config) for union type
if [ -z "$CHROOT_UNION_MOUNT_OPTIONS" ]; then
case $CHROOT_UNION_TYPE in
unionfs)
CHROOT_UNION_MOUNT_OPTIONS="dirs=${CHROOT_UNION_OVERLAY_DIRECTORY}=rw,${CHROOT_UNION_UNDERLAY_DIRECTORY}=ro"
;;
aufs)
CHROOT_UNION_MOUNT_OPTIONS="br:${CHROOT_UNION_OVERLAY_DIRECTORY}:${CHROOT_UNION_UNDERLAY_DIRECTORY}=ro"
;;
overlayfs)
CHROOT_UNION_MOUNT_OPTIONS="lowerdir=${CHROOT_UNION_UNDERLAY_DIRECTORY},upperdir=${CHROOT_UNION_OVERLAY_DIRECTORY}"
;;
esac
fi
info "Using '$CHROOT_UNION_TYPE' for filesystem union"
# Try mounting fs
mount -t "$CHROOT_UNION_TYPE" -o "$CHROOT_UNION_MOUNT_OPTIONS" "$CHROOT_NAME" "$1"
}
if [ "$VERBOSE" = "verbose" ]; then
MOUNT_VERBOSE="-v"
# FSCK_VERBOSE="-V"
fi
if [ "$CHROOT_TYPE" = "directory" ] \
|| [ "$CHROOT_TYPE" = "file" ] \
|| [ "$CHROOT_TYPE" = "loopback" ] \
|| [ "$CHROOT_TYPE" = "block-device" ] \
|| [ "$CHROOT_TYPE" = "lvm-snapshot" ] \
|| [ "$CHROOT_TYPE" = "btrfs-snapshot" ]; then
if [ "${CHROOT_UNION_TYPE:-none}" != "none" ]; then
CREATE_UNION="yes"
else
CREATE_UNION="no"
fi
if [ $STAGE = "setup-start" ] || [ $STAGE = "setup-recover" ]; then
case "$HOST_OS" in
freebsd* | k*bsd*-gnu) :
BINDOPT="-t nullfs"
;;
*):
BINDOPT="--bind"
;;
esac
if [ "$CHROOT_TYPE" = "directory" ]; then
CHROOT_MOUNT_OPTIONS="$BINDOPT $CHROOT_MOUNT_OPTIONS"
CHROOT_MOUNT_DEVICE="$CHROOT_DIRECTORY"
if [ ! -d "$CHROOT_DIRECTORY" ]; then
fatal "Directory '$CHROOT_DIRECTORY' does not exist"
fi
elif [ "$CHROOT_TYPE" = "file" ]; then
CHROOT_MOUNT_OPTIONS="$BINDOPT $CHROOT_MOUNT_OPTIONS"
CHROOT_MOUNT_DEVICE="${CHROOT_FILE_UNPACK_DIR}/${SESSION_ID}"
elif [ "$CHROOT_TYPE" = "block-device" ]; then
if [ ! "$DEVTYPE" "$CHROOT_DEVICE" ]; then
fatal "Device '$CHROOT_DEVICE' does not exist"
fi
elif [ "$CHROOT_TYPE" = "btrfs-snapshot" ]; then
CHROOT_MOUNT_OPTIONS="$BINDOPT $CHROOT_MOUNT_OPTIONS"
CHROOT_MOUNT_DEVICE="$CHROOT_BTRFS_SNAPSHOT_NAME"
elif [ "$CHROOT_TYPE" = "loopback" ]; then
if [ ! -f "$CHROOT_FILE" ]; then
fatal "File '$CHROOT_FILE' does not exist"
fi
case "$HOST_OS" in
freebsd* | k*bsd*-gnu):
LOOP_DEVICE="/dev/$(/sbin/mdconfig -a -t vnode -f "$CHROOT_FILE")"
CHROOT_MOUNT_DEVICE="$LOOP_DEVICE"
;;
*):
LOOP_DEVICE="$(/sbin/losetup -j "$CHROOT_FILE" | sed -e 's/:.*$//')"
if [ -z "$LOOP_DEVICE" ]; then
CHROOT_MOUNT_DEVICE="$CHROOT_FILE"
CHROOT_MOUNT_OPTIONS="-o loop $CHROOT_MOUNT_OPTIONS"
else
CHROOT_MOUNT_DEVICE="$LOOP_DEVICE"
fi
;;
esac
fi
if [ ! -d "$CHROOT_MOUNT_LOCATION" ]; then
mkdir -p "$CHROOT_MOUNT_LOCATION"
fi
if [ ! -d "$CHROOT_MOUNT_LOCATION" ]; then
fatal "$CHROOT_MOUNT_LOCATION does not exist, and could not be created"
fi
# If recovering, we want to remount all filesystems to ensure
# a sane state.
if [ $STAGE = "setup-recover" ]; then
if [ "$CREATE_UNION" = "yes" ]; then
do_umount_all "$CHROOT_UNION_UNDERLAY_DIRECTORY"
fi
do_umount_all "$CHROOT_MOUNT_LOCATION"
fi
if [ "$CREATE_UNION" = "yes" ]; then
do_mount "$CHROOT_MOUNT_OPTIONS" "$CHROOT_MOUNT_DEVICE" "$CHROOT_UNION_UNDERLAY_DIRECTORY"
do_mount_fs_union "$CHROOT_MOUNT_LOCATION"
else
do_mount "$CHROOT_MOUNT_OPTIONS" "$CHROOT_MOUNT_DEVICE" "$CHROOT_MOUNT_LOCATION"
fi
elif [ $STAGE = "setup-stop" ]; then
do_umount_all "$CHROOT_MOUNT_LOCATION"
if [ "$CREATE_UNION" = "yes" ]; then
do_umount_all "$CHROOT_UNION_UNDERLAY_DIRECTORY"
fi
# Purge mount location.
# The contents of file chroots are purged separately, because
# we might want to repack the contents.
if echo "$CHROOT_MOUNT_LOCATION" | grep -q "^$MOUNT_DIR/"; then
if [ -d "$CHROOT_MOUNT_LOCATION" ]; then
rmdir "$CHROOT_MOUNT_LOCATION"
fi
fi
fi
fi
# Mount filesystems from fstab for all chroot types
if [ $STAGE = "setup-start" ] || [ $STAGE = "setup-recover" ]; then
if [ -n "$SETUP_FSTAB" ]; then
if [ -f "$SETUP_FSTAB" ]; then
"$LIBEXEC_DIR/schroot-mount" $MOUNT_VERBOSE \
-f "$SETUP_FSTAB" -m "$CHROOT_PATH"
else
fatal "setup_fstab file '$SETUP_FSTAB' does not exist"
fi
fi
fi
|
