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|
#!/bin/bash
# invoked by backup scripts as
# remountrocp snap $vardir $device $mountpoint
# remounts $mountpoint readonly
# copies data to $vardir/snap-mount
# remounts $mountpoint readwrite
# remountrocp drop $vardir
# deletes $vardir/snap-mount
set -e
snapkind=remountrocp
: ${lvm_vg:=}
remountrocp_fs=ext2
. ${CHIARK_BACKUP_SHAREDIR:-/usr/share/chiark-backup}/snap-common
#---------- clean up anything
vgroup=$lvm_vg
lvmdropcore
lastsettings="$vardir/remountrocp-settings"
test ! -f $lastsettings || . $lastsettings
if test "$opmode" = drop; then
test -z "$last_mountpoint" || mount -o remount,rw $last_mountpoint
rm -f $lastsettings
echo 'remountrocp snap dropped'
exit 0
fi
#---------- create snapshot
if [ -z "$lvm_lvsize_opts" ]; then
lvmextentscore1
df_out="$(really df -P --block-size=$extsize $mountpoint)"
extents2="$(printf "%s" "$df_out" | awk '/^\// {print $3}')"
extents2=$(( ($extents2*150+102399)/102400 + 4 ))
lvmextentscore2
fi
lvmcreatecore1
cat >$lastsettings.new <<END
last_mountpoint=$mountpoint
END
mv -f $lastsettings.new $lastsettings
lvcreate \
$lvm_lvtools_opts \
$lvm_lvsize_opts \
-n $lvm_lv \
$lvm_lvcreate_opts \
$vgroup \
$lvm_lvcreate_args
mkfs -t $remountrocp_fs -q "$lvpath"
mkdir -- "$snmnt"
mount -t $remountrocp_fs $lvm_mount_opts "$lvpath" "$snmnt"
echo ' copy filesystem created and mounted'
attempts=10
while true; do
if mount -o remount,ro "$mountpoint"; then break; fi
attempts=$(( $attempts - 1 ))
if [ $attempts = 0 ]; then
echo >&2 'cannot remount readonly'
exit 1
fi
sleep 1
done
trap "set +e; mount -o remount,rw $mountpoint; exit 12" 0
echo ' source remounted readonly, copying...'
cp -ax -- "$mountpoint/." "$snmnt/."
echo ' finalising...'
mount -o remount,rw "$mountpoint"
trap '' 0
mount -o remount,ro "$lvpath"
echo 'remountrocp snap activated'
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