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1 | #!/bin/bash |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2012 Michael Tremer & Christian Schmidt # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | function lock_acquire() { | |
23 | local lockfile="${1}" | |
24 | assert isset lockfile | |
25 | ||
26 | # timeout value in seconds | |
27 | local timeout=60 | |
28 | timeout=$(( ${timeout} * 10 )) | |
29 | ||
30 | log DEBUG "Acquiring lock '${lockfile}'." | |
31 | ||
32 | local free="false" | |
33 | while [ ${timeout} -gt 0 ]; do | |
34 | if [ ! -e "${lockfile}" ]; then | |
35 | free="true" | |
36 | break | |
37 | fi | |
38 | ||
39 | timeout=$(( ${timeout} - 1 )) | |
40 | sleep 0.1 | |
41 | done | |
42 | ||
43 | assert ${free} "Could not acquire lock '${lockfile}'." | |
44 | ||
45 | # Write out pid to the lockfile and make sure that | |
46 | # nobody else can access it. | |
47 | echo "$$" > ${lockfile} | |
48 | chmod 600 ${lockfile} | |
49 | } | |
50 | ||
51 | function lock_release() { | |
52 | local lockfile="${1}" | |
53 | ||
54 | log DEBUG "Releasing lock '${lockfile}'." | |
55 | ||
56 | # Remove the lockfile (okay if it does not exist). | |
57 | rm -f ${lockfile} | |
58 | } |