# live-snapshot - utility to manage Debian Live systems snapshots
#
# This program mounts a device (fallback to /tmpfs under $MOUNTP
-# and saves the /live/cow (or a different dir) filesystem in it for reuse
-# in another live-initramfs session. Look at manpage for more info.
+# and saves the /live/cow (or a different directory) filesystem in it
+# for reuse in another live-initramfs session.
+# Look at the manpage for more informations.
#
# Copyright (C) 2006-2008 Marco Amadori <marco.amadori@gmail.com>
# Copyright (C) 2008 Chris Lamb <chris@chris-lamb.co.uk>
#
-# This program is free software; you can redistribute it and/or modify
+# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# On Debian systems, the complete text of the GNU General Public License
-# can be found in /usr/share/common-licenses/GPL-2 file.
+# can be found in /usr/share/common-licenses/GPL-3 file.
# declare here two vars from /etc/live.conf because of "set -u"
ROOTSNAP=""
# Permits multiple runs
MOUNTP="$(mktemp -d -p ${SAFE_TMPDIR} live-snapshot-mnt.XXXXXX)"
DEST="${MOUNTP}/live-sn.cpio.gz"
+DEF_SNAP_COW="/live/cow"
+TMP_FILELIST="${PROGRAM}.list"
# Command line defaults and declarations
-SNAP_COW="/live/cow"
+SNAP_COW="${DEF_SNAP_COW}"
SNAP_DEV=""
SNAP_OUTPUT=""
SNAP_RESYNC_STRING=""
SNAP_TYPE="cpio"
+SNAP_LIST="/etc/live-snapshot.list"
Error ()
{
esac
}
+Do_filelist ()
+{
+ # BUGS: supports only cpio.gz types right now
+ TMP_FILELIST=$1
+ if [ -f "${SNAP_LIST}" ]
+ then
+ # Generate include list
+ for entry in $(cat "${SNAP_LIST}" | grep -v '^#.*$' | grep -v '^ *$')
+ do
+ if [ -f "${entry}" ]
+ then
+ printf "%s\000" "${entry}" >> "${TMP_FILELIST}"
+ elif [ -d "${entry}" ]
+ then
+ cd /
+ find "${entry}" -print0 >> "${TMP_FILELIST}"
+ cd "${OLDPWD}"
+ fi
+ done
+
+ if [ "${SNAP_COW}" = "${DEF_SNAP_COW}" ]
+ then
+ # Relative to rootfs
+ echo "/"
+ else
+ # Mostly "/home"
+ echo "${SNAP_COW}"
+ fi
+ else
+ cd "${SNAP_COW}"
+ find . -path '*.wh.*' -prune -o -print0 >> "${TMP_FILELIST}"
+ cd "${OLDPWD}"
+ echo "${SNAP_COW}"
+ fi
+}
+
Do_snapshot ()
{
+ TMP_FILELIST=$(mktemp -p "${SAFE_TMPDIR}" "${TMP_FILELIST}.XXXXXX")
+
case "${SNAP_TYPE}" in
squashfs)
- EXCLUDE_LIST="$(mktemp -p ${SAFE_TMPDIR} live-snapshot-exclude-list.XXXXXX)"
- echo "./${EXCLUDE_LIST}" > "${EXCLUDE_LIST}"
+ echo ".${TMP_FILELIST}" > "${TMP_FILELIST}"
+ # Removing whiteheads of unionfs
cd "${SNAP_COW}"
- find . -name '*.wh.*' >> "${EXCLUDE_LIST}"
+ find . -name '*.wh.*' >> "${TMP_FILELIST}"
cd "${OLDPWD}"
- mksquashfs "${SNAP_COW}" "${DEST}" -ef "${EXCLUDE_LIST}"
- rm -f "${EXCLUDE_LIST}"
+ mksquashfs "${SNAP_COW}" "${DEST}" -ef "${TMP_FILELIST}"
;;
cpio)
- ( cd "${SNAP_COW}" && find . -path '*.wh.*' -prune -o -print0 | cpio --quiet -o0 -H newc | gzip -9c > "${DEST}" ) || exit 1
+ WORKING_DIR=$(Do_filelist "${TMP_FILELIST}")
+ cd "${WORKING_DIR}"
+ cat "${TMP_FILELIST}" | cpio --quiet -o0 -H newc | gzip -9c > "${DEST}" || exit 1
+ cd "${OLDPWD}"
;;
ext2|ext3)
mkfs.jffs2 --root="${SNAP_COW}" --output="${DEST}"
;;
esac
+
+ if [ -f "${TMP_FILELIST}" ]
+ then
+ rm -f "${TMP_FILELIST}"
+ fi
}
Clean ()
fi
}
+Warn_user ()
+{
+ if [ -z "${SNAP_RESYNC_STRING}" ]
+ then
+ case ${SNAP_TYPE} in
+ cpio|ext2|ext3)
+ echo "Please move ${DEST} (if is not already in it)" > /dev/null 1>&2
+ echo "in a supported writable partition (e.g ext3, vfat)." > /dev/null 1>&2
+ ;;
+
+ squashfs)
+ echo "To use ${DEST} you need to rebuild your media or add it" > /dev/null 1>&2
+ echo "to your multisession disc under the \"/live\" directory." > /dev/null 1>&2
+ ;;
+
+ jffs2)
+ echo "Please cat or flashcp ${DEST} to your partition in order to start using it." > /dev/null 1>&2
+ ;;
+ esac
+
+ if grep -qv persistent /proc/cmdline
+ then
+ echo "Remember to boot this live system with \"persistent\" specified at boot prompt." > /dev/null 1>&2
+ fi
+ fi
+}
+
Main ()
{
Parse_args "${@}"
trap 'Clean' EXIT
Mount_device
Do_snapshot
+ Warn_user
}
Main "${@:-}"
projects / live-boot-grml.git / blobdiff