# shell script fragment setting options
# defaults for currently implemented parameters are
+lvm_vg=vg_main
#lvm_lv=chiark_backup
-#lvm_lvsize_opts=-l <min(no. of free extents in vg, 1.1x total lv size)>
+#lvm_lvsize_opts=
+# -l <min(no. of free extents in vg, 1.1x total lv size)> (lvm)
+# -l <min(no. of free extents in vg, 1.5x total space used)> (remountrocp)
#lvm_lvtools_opts='-A n'
#lvm_lvcreate_opts=
#lvm_lvcreate_args=
# lvm drop $vardir
set -e
-
-nargs=$#
-opmode="$1"
-vardir="$2"
-device="$3"
-mountpoint="$4"
-
-lvm_lv=chiark-backup
-lvm_lvtools_opts='-A n'
-lvm_lvcreate_opts=
-lvm_lvcreate_args=
-
-test ! -f /etc/chiark-backup/settings.sh || . /etc/chiark-backup/settings.sh
-
-case "$nargs.$opmode" in
-4.snap|2.drop)
- ;;
-*)
- cat >&2 <<'END'
-usage: .../lvm snap VARDIR DEV MOUNT
- .../lvm drop VARDIR
-END
- exit 1
- ;;
-esac
-
+snapkind=lvm
+. /usr/share/chiark-backup/snap-common
#---------- clean up anything
-snmnt="$vardir/snap-mount"
-umount -v "$snmnt" || true
-test ! -d "$snmnt" || rmdir -- "$snmnt"
-
-set +e
-old_lv_dev="$(readlink $vardir/snap-device)"
-rc=$?
-set -e
-
-if [ $rc = 0 ]; then
- set +e
- lvchange $lvm_lvtools_opts -a n $old_lv_dev
- lvremove -f $lvm_lvtools_opts $old_lv_dev
- set -e
- rm $vardir/snap-device
-fi
+lvmdropcore
if test "$opmode" = drop; then
echo 'lvm snap dropped'
"s,^$device on $mountpoint type \([a-z0-9][a-z0-9]*\) .*,-t \1 ,p")"
if [ -z "$lvm_lvsize_opts" ]; then
- vggroup="${device#/dev/}"
- vggroup="${vggroup%/*}"
- vgdisplay_out="$(really vgdisplay -c "$vggroup")"
- extents="$(printf "%s" "$vgdisplay_out" | awk -F: '{print $16}')"
+ vgroup="${device#/dev/}"
+ vgroup="${vgroup%/*}"
+ lvmextentscore1
lvdisplay_out="$(really lvdisplay -c "$device")"
extents2="$(printf "%s" "$lvdisplay_out" | awk -F: '{print $9}')"
extents2=$(( $extents2 + ($extents2+9)/10 - 1 ))
- if [ $extents2 -lt $extents ]; then extents=$extents2; fi
-
- lvm_lvsize_opts="-l $extents"
+ lvmextentscore2
fi
-lvpath="$(dirname "$device")/$lvm_lv"
-
-ln -s -- "$lvpath" "$vardir"/snap-device
+lvmcreatecore1
-sync
lvcreate -s \
$lvm_lvtools_opts \
$lvm_lvsize_opts \
--- /dev/null
+#!/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 "$lvpath"
+
+echo 'remountrocp snap activated'
--- /dev/null
+# sourced by snap/lvm and snap/remountrocp
+
+#---------- common arg parsing
+
+nargs=$#
+opmode="$1"
+vardir="$2"
+device="$3"
+mountpoint="$4"
+
+lvm_lv=chiark-backup
+lvm_lvtools_opts='-A n'
+lvm_lvcreate_opts=
+lvm_lvcreate_args=
+
+test ! -f /etc/chiark-backup/settings.sh || . /etc/chiark-backup/settings.sh
+
+case "$nargs.$opmode" in
+4.snap|2.drop)
+ ;;
+*)
+ cat >&2 <<END
+usage: .../$snapkind snap VARDIR DEV MOUNT
+ .../$snapkind drop VARDIR
+END
+ exit 1
+ ;;
+esac
+
+#---------- common functions
+
+lvmdropcore () {
+ snmnt="$vardir/snap-mount"
+ umount -v "$snmnt" || true
+ test ! -d "$snmnt" || rmdir -- "$snmnt"
+
+ set +e
+ old_lv_dev="$(readlink $vardir/snap-device)"
+ rc=$?
+ set -e
+
+ if [ $rc = 0 ]; then
+ set +e
+ lvchange $lvm_lvtools_opts -a n $old_lv_dev
+ lvremove -f $lvm_lvtools_opts $old_lv_dev
+ set -e
+ rm $vardir/snap-device
+ fi
+}
+
+lvmextentscore1 () {
+ vgdisplay_out="$(really vgdisplay -c "$vgroup")"
+ extents="$(printf "%s" "$vgdisplay_out" | awk -F: '{print $16}')"
+ extsize="$(printf "%s" "$vgdisplay_out" | awk -F: '{print $13}')"
+}
+
+lvmextentscore2 () {
+ if [ $extents2 -lt $extents ]; then extents=$extents2; fi
+ lvm_lvsize_opts="-l $extents"
+}
+
+lvmcreatecore1 () {
+ lvpath="/dev/$vgroup/$lvm_lv"
+ ln -s -- "$lvpath" "$vardir"/snap-device
+ sync
+}
* summer sorts the output and identifies hardlink
targets instead of printing link count.
-
+ * backup: new `remountrocp' snapshot type.
--
~ian / chiark-utils.git / commitdiff