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8ea48dfc LP |
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 | ||
3ffd4af2 | 22 | #include "fd-util.h" |
d7b8eec7 | 23 | #include "selinux-util.h" |
3ffd4af2 | 24 | #include "util.h" |
8ea48dfc | 25 | |
4aa4d2ae ZJS |
26 | #define MESSAGE \ |
27 | "This file was created by systemd-update-done. Its only \n" \ | |
28 | "purpose is to hold a timestamp of the time this directory\n" \ | |
29 | "was updated. See systemd-update-done.service(8).\n" | |
30 | ||
8ea48dfc | 31 | static int apply_timestamp(const char *path, struct timespec *ts) { |
0a2f9085 LP |
32 | struct timespec twice[2] = { |
33 | *ts, | |
34 | *ts | |
35 | }; | |
8ea48dfc LP |
36 | struct stat st; |
37 | ||
38 | assert(path); | |
39 | assert(ts); | |
40 | ||
41 | if (stat(path, &st) >= 0) { | |
329c5425 LP |
42 | /* Is the timestamp file already newer than the OS? If |
43 | * so, there's nothing to do. We ignore the nanosecond | |
44 | * component of the timestamp, since some file systems | |
45 | * do not support any better accuracy than 1s and we | |
46 | * have no way to identify the accuracy | |
47 | * available. Most notably ext4 on small disks (where | |
48 | * 128 byte inodes are used) does not support better | |
49 | * accuracy than 1s. */ | |
50 | if (st.st_mtim.tv_sec > ts->tv_sec) | |
8ea48dfc LP |
51 | return 0; |
52 | ||
53 | /* It is older? Then let's update it */ | |
8ea48dfc LP |
54 | if (utimensat(AT_FDCWD, path, twice, AT_SYMLINK_NOFOLLOW) < 0) { |
55 | ||
755bde37 LP |
56 | if (errno == EROFS) |
57 | return log_debug("Can't update timestamp file %s, file system is read-only.", path); | |
8ea48dfc | 58 | |
755bde37 | 59 | return log_error_errno(errno, "Failed to update timestamp on %s: %m", path); |
8ea48dfc LP |
60 | } |
61 | ||
62 | } else if (errno == ENOENT) { | |
63 | _cleanup_close_ int fd = -1; | |
7dbb1d08 | 64 | int r; |
8ea48dfc LP |
65 | |
66 | /* The timestamp file doesn't exist yet? Then let's create it. */ | |
67 | ||
ecabcf8b | 68 | r = mac_selinux_create_file_prepare(path, S_IFREG); |
755bde37 LP |
69 | if (r < 0) |
70 | return log_error_errno(r, "Failed to set SELinux context for %s: %m", path); | |
7dbb1d08 | 71 | |
8ea48dfc | 72 | fd = open(path, O_CREAT|O_EXCL|O_WRONLY|O_TRUNC|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); |
ecabcf8b | 73 | mac_selinux_create_file_clear(); |
7dbb1d08 | 74 | |
8ea48dfc | 75 | if (fd < 0) { |
755bde37 LP |
76 | if (errno == EROFS) |
77 | return log_debug("Can't create timestamp file %s, file system is read-only.", path); | |
8ea48dfc | 78 | |
755bde37 | 79 | return log_error_errno(errno, "Failed to create timestamp file %s: %m", path); |
8ea48dfc LP |
80 | } |
81 | ||
4aa4d2ae ZJS |
82 | (void) loop_write(fd, MESSAGE, strlen(MESSAGE), false); |
83 | ||
755bde37 LP |
84 | if (futimens(fd, twice) < 0) |
85 | return log_error_errno(errno, "Failed to update timestamp on %s: %m", path); | |
86 | } else | |
87 | log_error_errno(errno, "Failed to stat() timestamp file %s: %m", path); | |
8ea48dfc LP |
88 | |
89 | return 0; | |
90 | } | |
91 | ||
92 | int main(int argc, char *argv[]) { | |
93 | struct stat st; | |
7dbb1d08 | 94 | int r, q = 0; |
8ea48dfc LP |
95 | |
96 | log_set_target(LOG_TARGET_AUTO); | |
97 | log_parse_environment(); | |
98 | log_open(); | |
99 | ||
100 | if (stat("/usr", &st) < 0) { | |
755bde37 | 101 | log_error_errno(errno, "Failed to stat /usr: %m"); |
8ea48dfc LP |
102 | return EXIT_FAILURE; |
103 | } | |
104 | ||
cc56fafe | 105 | r = mac_selinux_init(NULL); |
7dbb1d08 | 106 | if (r < 0) { |
da927ba9 | 107 | log_error_errno(r, "SELinux setup failed: %m"); |
7dbb1d08 ZJS |
108 | goto finish; |
109 | } | |
8ea48dfc | 110 | |
7dbb1d08 | 111 | r = apply_timestamp("/etc/.updated", &st.st_mtim); |
8ea48dfc | 112 | q = apply_timestamp("/var/.updated", &st.st_mtim); |
8ea48dfc | 113 | |
7dbb1d08 ZJS |
114 | finish: |
115 | return r < 0 || q < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
8ea48dfc | 116 | } |