Check losetup capabilities before specifying to mount as read-only.

[live-boot-grml.git] / bin / live-snapshot

diff --git a/bin/live-snapshot b/bin/live-snapshot
index 67e853a..a6550e5 100755 (executable)
--- a/bin/live-snapshot
+++ b/bin/live-snapshot
@@ -3,15 +3,16 @@
 # 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,
@@ -20,11 +21,10 @@
 # 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=""
@@ -352,6 +352,33 @@ 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 ${DEST} to your partition in order to start using it." > /dev/null 1>&2
+                               ;;
+               esac
+
+               if grep -qv persistent /proc/cmdline
+               then
+                       echo "Remember to boot this live system with \"persistent\" specified at boot prompt." > /dev/null 1>&2
+               fi
+       fi
+}
+
 Main ()
 {
        Parse_args "${@}"
@@ -360,6 +387,7 @@ Main ()
        trap 'Clean' EXIT
        Mount_device
        Do_snapshot
+       Warn_user
 }
 
 Main "${@:-}"