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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 | ||
22 | #include "util.h" | |
7dbb1d08 | 23 | #include "label.h" |
8ea48dfc | 24 | |
4aa4d2ae ZJS |
25 | #define MESSAGE \ |
26 | "This file was created by systemd-update-done. Its only \n" \ | |
27 | "purpose is to hold a timestamp of the time this directory\n" \ | |
28 | "was updated. See systemd-update-done.service(8).\n" | |
29 | ||
8ea48dfc LP |
30 | static int apply_timestamp(const char *path, struct timespec *ts) { |
31 | struct timespec twice[2]; | |
32 | struct stat st; | |
33 | ||
34 | assert(path); | |
35 | assert(ts); | |
36 | ||
37 | if (stat(path, &st) >= 0) { | |
38 | /* Is the timestamp file already newer than the OS? If so, there's nothing to do. */ | |
39 | if (st.st_mtim.tv_sec > ts->tv_sec || | |
40 | (st.st_mtim.tv_sec == ts->tv_sec && st.st_mtim.tv_nsec >= ts->tv_nsec)) | |
41 | return 0; | |
42 | ||
43 | /* It is older? Then let's update it */ | |
44 | twice[0] = *ts; | |
45 | twice[1] = *ts; | |
46 | ||
47 | if (utimensat(AT_FDCWD, path, twice, AT_SYMLINK_NOFOLLOW) < 0) { | |
48 | ||
49 | if (errno == EROFS) { | |
50 | log_debug("Can't update timestamp file %s, file system is read-only.", path); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | log_error("Failed to update timestamp on %s: %m", path); | |
55 | return -errno; | |
56 | } | |
57 | ||
58 | } else if (errno == ENOENT) { | |
59 | _cleanup_close_ int fd = -1; | |
7dbb1d08 | 60 | int r; |
8ea48dfc LP |
61 | |
62 | /* The timestamp file doesn't exist yet? Then let's create it. */ | |
63 | ||
ecabcf8b | 64 | r = mac_selinux_create_file_prepare(path, S_IFREG); |
7dbb1d08 ZJS |
65 | if (r < 0) { |
66 | log_error("Failed to set SELinux context for %s: %s", | |
67 | path, strerror(-r)); | |
68 | return r; | |
69 | } | |
70 | ||
8ea48dfc | 71 | fd = open(path, O_CREAT|O_EXCL|O_WRONLY|O_TRUNC|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); |
ecabcf8b | 72 | mac_selinux_create_file_clear(); |
7dbb1d08 | 73 | |
8ea48dfc LP |
74 | if (fd < 0) { |
75 | ||
76 | if (errno == EROFS) { | |
77 | log_debug("Can't create timestamp file %s, file system is read-only.", path); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | log_error("Failed to create timestamp file %s: %m", path); | |
82 | return -errno; | |
83 | } | |
84 | ||
4aa4d2ae ZJS |
85 | (void) loop_write(fd, MESSAGE, strlen(MESSAGE), false); |
86 | ||
8ea48dfc LP |
87 | twice[0] = *ts; |
88 | twice[1] = *ts; | |
89 | ||
90 | if (futimens(fd, twice) < 0) { | |
91 | log_error("Failed to update timestamp on %s: %m", path); | |
92 | return -errno; | |
93 | } | |
94 | } else { | |
95 | log_error("Failed to stat() timestamp file %s: %m", path); | |
96 | return -errno; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | int main(int argc, char *argv[]) { | |
103 | struct stat st; | |
7dbb1d08 | 104 | int r, q = 0; |
8ea48dfc LP |
105 | |
106 | log_set_target(LOG_TARGET_AUTO); | |
107 | log_parse_environment(); | |
108 | log_open(); | |
109 | ||
110 | if (stat("/usr", &st) < 0) { | |
111 | log_error("Failed to stat /usr: %m"); | |
112 | return EXIT_FAILURE; | |
113 | } | |
114 | ||
cc56fafe | 115 | r = mac_selinux_init(NULL); |
7dbb1d08 | 116 | if (r < 0) { |
da927ba9 | 117 | log_error_errno(r, "SELinux setup failed: %m"); |
7dbb1d08 ZJS |
118 | goto finish; |
119 | } | |
8ea48dfc | 120 | |
7dbb1d08 | 121 | r = apply_timestamp("/etc/.updated", &st.st_mtim); |
8ea48dfc | 122 | q = apply_timestamp("/var/.updated", &st.st_mtim); |
8ea48dfc | 123 | |
7dbb1d08 ZJS |
124 | finish: |
125 | return r < 0 || q < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
8ea48dfc | 126 | } |