X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=chiark-utils.git;a=blobdiff_plain;f=backup%2Fremountrocp;fp=backup%2Fremountrocp;h=5e40cc37cc72976d5a7d827a9830de1f0f296683;hp=0000000000000000000000000000000000000000;hb=b7fed73a8d9509acef0307ce94d59c047653b821;hpb=2ecf9414320f30c767b9ba1c9c343529a0cb9504

diff --git a/backup/remountrocp b/backup/remountrocp
new file mode 100755
index 0000000..5e40cc3
--- /dev/null
+++ b/backup/remountrocp
@@ -0,0 +1,69 @@
+#!/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 $3}')"
+	extents2=$(( ($extents2*150+99)/100 + 4 ))
+
+	lvmextentscore2
+fi
+
+lvmcreatecore1
+
+cat >$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 $remountrocp_fs "$lvpath"
+mkdir -- "$snmnt"
+mount -t $remountrocp_fs $lvm_mount_opts "$lvpath" "$snmnt"
+
+mount -o remount,ro "$mountpoint"
+trap "mount -o remount,rw $mountpoint; exit 12" 0
+cp -a -- "$mountpoint/." "$snmnt/."
+mount -o remount,rw "$mountpoint"
+trap '' 0
+mount -o remount,ro "$lvpath"
+
+echo 'remountrocp snap activated'