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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "util.h" | |
23 | ||
24 | static int apply_timestamp(const char *path, struct timespec *ts) { | |
25 | struct timespec twice[2]; | |
26 | struct stat st; | |
27 | ||
28 | assert(path); | |
29 | assert(ts); | |
30 | ||
31 | if (stat(path, &st) >= 0) { | |
32 | /* Is the timestamp file already newer than the OS? If so, there's nothing to do. */ | |
33 | if (st.st_mtim.tv_sec > ts->tv_sec || | |
34 | (st.st_mtim.tv_sec == ts->tv_sec && st.st_mtim.tv_nsec >= ts->tv_nsec)) | |
35 | return 0; | |
36 | ||
37 | /* It is older? Then let's update it */ | |
38 | twice[0] = *ts; | |
39 | twice[1] = *ts; | |
40 | ||
41 | if (utimensat(AT_FDCWD, path, twice, AT_SYMLINK_NOFOLLOW) < 0) { | |
42 | ||
43 | if (errno == EROFS) { | |
44 | log_debug("Can't update timestamp file %s, file system is read-only.", path); | |
45 | return 0; | |
46 | } | |
47 | ||
48 | log_error("Failed to update timestamp on %s: %m", path); | |
49 | return -errno; | |
50 | } | |
51 | ||
52 | } else if (errno == ENOENT) { | |
53 | _cleanup_close_ int fd = -1; | |
54 | ||
55 | /* The timestamp file doesn't exist yet? Then let's create it. */ | |
56 | ||
57 | fd = open(path, O_CREAT|O_EXCL|O_WRONLY|O_TRUNC|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); | |
58 | if (fd < 0) { | |
59 | ||
60 | if (errno == EROFS) { | |
61 | log_debug("Can't create timestamp file %s, file system is read-only.", path); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | log_error("Failed to create timestamp file %s: %m", path); | |
66 | return -errno; | |
67 | } | |
68 | ||
69 | twice[0] = *ts; | |
70 | twice[1] = *ts; | |
71 | ||
72 | if (futimens(fd, twice) < 0) { | |
73 | log_error("Failed to update timestamp on %s: %m", path); | |
74 | return -errno; | |
75 | } | |
76 | } else { | |
77 | log_error("Failed to stat() timestamp file %s: %m", path); | |
78 | return -errno; | |
79 | } | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | int main(int argc, char *argv[]) { | |
85 | struct stat st; | |
86 | int r, q; | |
87 | ||
88 | log_set_target(LOG_TARGET_AUTO); | |
89 | log_parse_environment(); | |
90 | log_open(); | |
91 | ||
92 | if (stat("/usr", &st) < 0) { | |
93 | log_error("Failed to stat /usr: %m"); | |
94 | return EXIT_FAILURE; | |
95 | } | |
96 | ||
97 | r = apply_timestamp("/etc/.updated", &st.st_mtim); | |
98 | ||
99 | q = apply_timestamp("/var/.updated", &st.st_mtim); | |
100 | if (q < 0 && r == 0) | |
101 | r = q; | |
102 | ||
103 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
104 | } |