I have been having issues trying to do a persistent-usb image for
Ubuntu 12.04.
* /cow is not checked with fsck on startup. (casper patch to fix this
attached)
* /cow is not visible in / by default. I think this is required if
we are ever to be able to unmount /cow cleanly.
(fixed by attached casper patch).
* /cow cannot be cleanly un-mounted on shutdown
I've made some attempts, but have not gotten this working.
The attached '/etc/init.d/umountroot' contains my attempts.
I'd love to get this working cleanly....so please let me know if you
have any suggestions.
I'm not sure if Ubuntu uses 'signed-off-by' for this type
of thing, but if so, consider it:
Signed-off-by: Ben Greear <gree...@candelatech.com>
Thanks,
Ben
--
Ben Greear <gree...@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
--- /home/greearb/casper.orig 2012-05-08 09:09:43.012658969 -0700
+++ casper 2012-05-16 15:10:04.310483151 -0700
@@ -17,6 +17,7 @@
USERFULLNAME="Live session user"
HOST=live
BUILD_SYSTEM=Custom
+FSCKARG=-p
mkdir -p $mountpoint
tried=/tmp/tried
@@ -61,6 +62,10 @@
export TORAM="Yes" ;;
todisk=*)
export TODISK="${x#todisk=}" ;;
+ fscky)
+ FSCKARG=-y ;;
+ casper-notquiet)
+ quiet=n ;;
esac
done
if [ "${UNIONFS}" = "" ]; then
@@ -441,6 +446,24 @@
fi
fi
+ if [ "_${cow_fstype}" = "_ext2" -o "_${cow_fstype}" = "_ext3" -o "_${cow_fstype}" = "_ext4" ]
+ then
+ [ "$quiet" != "y" ] && log_warning_msg "Running e2fsck on ${cowdevice}, fstype: ${cow_fstype}"
+ e2fsck ${FSCKARG} ${cowdevice}
+ EC2=$?
+ if [ $EC2 != "0" ]
+ then
+ if [ $EC2 = "1" ]
+ then
+ log_warning_msg "e2fsck automatically corrected errors on ${cowdevice}, fstype: ${cow_fstype}"
+ else
+ panic "ERROR: Possible file system corruption on ${cowdevice}: $EC2 Run: e2fsck ${cowdevice} or e2fsck -y ${cowdevice} and then exit"
+ fi
+ fi
+ else
+ [ "$quiet" != "y" ] && log_warning_msg "Not running fsck on ${cowdevice}, only ext2/2/4 fsck supported: ${cow_fstype}"
+ fi
+
mount -t ${cow_fstype} -o ${cow_mountopt} ${cowdevice} /cow || panic "Can not mount $cowdevice on /cow"
case ${UNIONFS} in
@@ -505,9 +528,17 @@
;;
esac
done
- # shows cow fs on /cow for use by casper-snapshot
- mkdir -p "${rootmnt}/cow"
- mount -o bind /cow "${rootmnt}/cow"
+ fi
+
+ # We always need to show cow so we can at least try to gracefully
+ # unmount it on shutdown (or re-mount ro or whatever)
+
+ # shows cow fs on /cow for use by casper-snapshot
+ mkdir -p "${rootmnt}/cow"
+ if [ "${UNIONFS}" = unionfs-fuse ]; then
+ mount -o bind /cow "${rootmnt}/cow"
+ else
+ mount -o move /cow "${rootmnt}/cow"
fi
# move the first mount; no head in busybox-initramfs
#! /bin/sh
### BEGIN INIT INFO
# Provides: umountroot
# Required-Start:
# Required-Stop:
# Should-Stop: halt reboot kexec
# Default-Start:
# Default-Stop: 0 6
# Short-Description: Mount the root filesystem read-only.
### END INIT INFO
PATH=/sbin:/bin
. /lib/init/vars.sh
. /lib/lsb/init-functions
do_stop () {
[ "$VERBOSE" = no ] || log_action_begin_msg "Mounting root filesystem
read-only"
# Ask init to re-exec itself before we go down if it has been
# upgraded this cycle. It'll lose all its state, but at least
# it won't hold open files on the root filesystem (lp:#672177).
if [ -f /var/run/init.upgraded ]
then
old_map=$( cat /proc/1/maps )
map=$old_map
telinit u || :
i=0
timeout=5
while [ "$map" = "$old_map" ]
do
sleep 1
map=$( cat /proc/1/maps )
/usr/bin/logger "waiting for init to respawn"
i=$((i+1))
if [ $i -eq $timeout ] ; then
break
fi
done
if [ "$map" = "$old_map" ] ; then
/usr/bin/logger "FAIL: init failed to respawn in
$timeout seconds - unmounting anyway"
else
/usr/bin/logger "SUCCESS: init respawned after $i
seconds (within $timeout seconds timeout)"
fi
fi
# These directories must exist on the root filesystem as they are
# targets for system mountpoints. We've just unmounted all other
# filesystems, so either they are mounted now (in which case the
# mount point exists) or we can make the mountpoint.
for dir in /proc /sys; do
mkdir -p $dir || true
done
# These must be turned into symlinks for the /run transition. We
# can't do this at boot time because / is remounted read-write too
# late, so do it on shutdown instead.
if [ -d /var/run ]; then
umount -l /var/run || true
rm -rf /var/run
ln -nsf /run /var/run
fi
if [ -d /var/lock ]; then
umount -l /var/lock || true
rm -rf /var/lock
ln -nsf /run/lock /var/lock
fi
if [ -d /dev/shm ]; then
umount -l /dev/shm || true
rm -rf /dev/shm
ln -nsf /run/shm /dev/shm
fi
if [ ! -L /lib/init/rw ] && umount -l /lib/init/rw && \
rm -rf /lib/init/rw; then
ln -nsf /run /lib/init/rw
elif [ -L /lib/init/rw ] && [ $(readlink /lib/init/rw) != /run ]; then
rm -f /lib/init/rw
ln -nsf /run /lib/init/rw
fi
MOUNT_FORCE_OPT=
[ "$(uname -s)" = "GNU/kFreeBSD" ] && MOUNT_FORCE_OPT=-f
# This:
# mount -n -o remount,ro /
# will act on a bind mount of / if there is one.
# See #339023 and the comment in checkroot.sh
sync
set -x
auplink / flush
mount $MOUNT_FORCE_OPT -n -o remount,ro -t dummytype dummydev /
2>/dev/null \
|| mount $MOUNT_FORCE_OPT -n -o remount,ro dummydev /
2>/dev/null \
|| mount $MOUNT_FORCE_OPT -n -o remount,ro /
ES=$?
sync
[ "$VERBOSE" = no ] || log_action_end_msg $ES
if [ -d /cow ]
then
# Remove from aufs
# This doesn't actually seem to work.
MOUNT_FORCE_OPT=-f
mount $MOUNT_FORCE_OPT -n -o remount,mod:/cow=ro /
mount $MOUNT_FORCE_OPT -n -o remount,del:/cow /
mount $MOUNT_FORCE_OPT -n -o remount,ro /cow
umount $MOUNT_FORCE_OPT -n /cow
fi
cat /proc/mounts
# Give usb persistent storage a chance to calm down??
sleep 10
}
case "$1" in
start)
# No-op
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
stop)
do_stop
;;
*)
echo "Usage: $0 start|stop" >&2
exit 3
;;
esac
:
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