Commit | Line | Data |
---|---|---|
3988a733 | 1 | #!/bin/bash |
711a0748 | 2 | |
9028e234 IJ |
3 | # Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk> |
4 | # Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk> | |
5 | # Copyright 1999,2003 | |
6 | # Chancellor Masters and Scholars of the University of Cambridge | |
7 | # Copyright 2010 Tony Finch <fanf@dotat.at> | |
711a0748 | 8 | # |
9 | # This is free software; you can redistribute it and/or modify it | |
10 | # under the terms of the GNU General Public License as published by | |
9028e234 | 11 | # the Free Software Foundation; either version 3 of the License, or |
711a0748 | 12 | # (at your option) any later version. |
13 | # | |
14 | # This program is distributed in the hope that it will be useful, but | |
15 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | # General Public License for more details. | |
18 | # | |
19 | # You should have received a copy of the GNU General Public License | |
9028e234 | 20 | # along with userv-utils; if not, see http://www.gnu.org/licenses/. |
711a0748 | 21 | |
3988a733 | 22 | set -e |
23 | ||
24 | zone="$1" | |
25 | subdomain="$2" | |
26 | interval_min="$3" | |
27 | interval_avg="$4" | |
28 | interval_mem="$5" | |
29 | ||
30 | now=`date +%s` | |
31 | charge=0 | |
32 | ||
33 | case $subdomain in | |
34 | '@') files=_ ;; | |
35 | *) files=$subdomain ;; | |
36 | esac | |
37 | ||
38 | if test -f $files,timings && read lastup charge <$files,timings | |
39 | then | |
40 | if [ $now -lt $[ $lastup + $interval_min ] ]; then | |
41 | echo "wait $[ $lastup + $interval_min - $now ]" | |
42 | echo >&2 "must wait at least $interval_min between updates" | |
43 | exit 75 | |
44 | fi | |
45 | charge=$[ $charge + $interval_avg - ($now - $lastup) ] | |
46 | if [ $charge -gt $interval_mem ]; then | |
47 | echo "wait $[ $charge - $interval_mem ]" | |
48 | echo >&2 "must wait on average $interval_avg between updates" | |
49 | exit 75 | |
50 | fi | |
51 | if [ $charge -lt 0 ]; then charge=0; fi | |
52 | fi | |
53 | ||
54 | sort >$files,new | |
55 | ||
56 | if test -f $files,data | |
57 | then | |
58 | set +e | |
59 | diff >/dev/null $files,data $files,new | |
60 | diff=$? | |
61 | set -e | |
62 | ||
63 | if [ $diff = 0 ]; then echo 'unchanged'; exit 0; fi | |
64 | if [ $diff != 1 ]; then exit 1; fi | |
65 | fi | |
66 | ||
67 | echo $now $charge >$files,timings.new | |
68 | mv -f $files,timings.new $files,timings | |
69 | mv $files,new $files,data | |
70 | ||
6362f12c | 71 | exec /usr/share/userv/dyndns/install $zone |