3 ### Establish snapshots of LVM logical volumes
5 ### (c) 2011 Mark Wooding
8 ###----- Licensing notice ---------------------------------------------------
10 ### This program is free software; you can redistribute it and/or modify
11 ### it under the terms of the GNU General Public License as published by
12 ### the Free Software Foundation; either version 2 of the License, or
13 ### (at your option) any later version.
15 ### This program is distributed in the hope that it will be useful,
16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ### GNU General Public License for more details.
20 ### You should have received a copy of the GNU General Public License
21 ### along with this program; if not, write to the Free Software Foundation,
22 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ###--------------------------------------------------------------------------
28 ### Parse the command line.
30 ## Provide help or version information.
31 usage="usage: $quis DEVICE [KEY=VALUE ...]"
32 version="$quis, version 1.0.0"
34 0,*) echo >&2 "$usage"; exit 1 ;;
35 *,-v | *,--version) echo "$version"; exit ;;
42 op=OPERATION \`snap' to create snapshot, or \`unsnap' to remove.
43 snapsz=SIZE Size to reserve for snapshot storage.
44 tag=TAG Disambiguation tag to append to logical volume name.
50 ## Scan the option keys.
52 Oop=snap Otag=snap Osnapsz=100M
57 *) echo >&2 "$quis: malformed option \`$i'"; exit 1 ;;
60 case "$k" in *.lvm) k=${k%.lvm} ;; ?*.?*) continue ;; esac
62 op | tag | snapsz) eval "O$k=\$v" ;;
63 *) echo >&2 "$quis: unknown option \`$k'"; win=nil ;;
66 case $win in nil) exit 1 ;; esac
68 ## Check the device name.
70 ?*/?*) ;; *) echo >&2 "$quis: device \`$dev' should be VG/LV"; exit 1 ;;
72 vg=${dev%%/*} lv=${dev#*/}
74 ###--------------------------------------------------------------------------
75 ### Take or remove the snapshot.
81 *%*) szarg="extents" ;;
84 lvcreate >/dev/null --snapshot \
92 ## LVM snapshot removal is full of awful bugs, mostly to do with races
93 ## with udev. We have a handy script which does the necessary. May it
94 ## not be needed for long.
95 lvm-rmsnap >/dev/null "$vg/$lv.$Otag"
99 echo >&2 "$quis: unknown operation \`$Oop'"
105 ###----- That's all, folks --------------------------------------------------