~mdw / distorted-backup / blame
| Commit | Line | Data |
|---|---|---|
| 99248ed2 MW |
1 | #! /bin/sh |
| 2 | ### | |
| 3 | ### Make fake snapshots by doing nothing at all | |
| 4 | ### | |
| 5 | ### (c) 2011 Mark Wooding | |
| 6 | ### | |
| 7 | ||
| 8 | ###----- Licensing notice --------------------------------------------------- | |
| 9 | ### | |
| 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. | |
| 14 | ### | |
| 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. | |
| 19 | ### | |
| 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. | |
| 23 | ||
| 24 | set -e | |
| 25 | quis=${0##*/} | |
| 26 | ||
| 27 | ###-------------------------------------------------------------------------- | |
| 28 | ### Parse the command line. | |
| 29 | ||
| 30 | ## Provide help or version information. | |
| 31 | usage="usage: $quis DEVICE [KEY=VALUE ...]" | |
| 32 | version="$quis, version 1.0.0" | |
| 33 | case "$#,$1" in | |
| 34 | 0,*) echo >&2 "$usage"; exit 1 ;; | |
| 35 | *,-v | *,--version) echo "$version"; exit ;; | |
| 36 | *,-h | *,--help) | |
| 37 | cat <<EOF | |
| 38 | $version | |
| 39 | $usage | |
| 40 | ||
| 41 | Option keys: | |
| 42 | op=OPERATION \`snap' to create snapshot, or \`unsnap' to remove. | |
| 43 | tag=TAG Disambiguation tag to store in filesystem. | |
| 44 | EOF | |
| 45 | exit | |
| 46 | ;; | |
| 47 | esac | |
| 48 | ||
| 49 | ## Scan the option keys. | |
| 50 | dev=$1; shift | |
| 51 | Oop=snap Otag=snap | |
| 52 | win=t | |
| 53 | for i in "$@"; do | |
| 54 | case "$i" in | |
| 55 | ?*=*) ;; | |
| 56 | *) echo >&2 "$quis: malformed option \`$i'"; exit 1 ;; | |
| 57 | esac | |
| 58 | k=${i%%=*} v=${i#*=} | |
| 59 | case "$k" in *.trivial) k=${k%.trivial} ;; ?*.?*) continue ;; esac | |
| 60 | case "$k" in | |
| 61 | op | tag) eval "O$k=\$v" ;; | |
| 62 | *) echo >&2 "$quis: unknown option \`$k'"; win=nil ;; | |
| 63 | esac | |
| 64 | done | |
| 65 | case $win in nil) exit 1 ;; esac | |
| 66 | ||
| 67 | ###-------------------------------------------------------------------------- | |
| 68 | ### Take or remove the snapshot. | |
| 69 | ||
| 70 | case "$Oop" in | |
| 71 | snap) | |
| 72 | echo "$dev" | |
| 73 | ;; | |
| 74 | unsnap) | |
| 75 | ;; | |
| 76 | *) | |
| 77 | echo >&2 "$quis: unknown operation \`$Oop'" | |
| 78 | exit 1 | |
| 79 | ;; | |
| 80 | esac | |
| 81 | ||
| 82 | ###----- That's all, folks -------------------------------------------------- |