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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
d360705f LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2012 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
22 | #include <unistd.h> | |
23 | ||
f4f15635 | 24 | #include "fs-util.h" |
d360705f | 25 | #include "log.h" |
1cec251c | 26 | #include "proc-cmdline.h" |
075dafd2 | 27 | #include "special.h" |
07630cea | 28 | #include "string-util.h" |
d360705f | 29 | #include "util.h" |
d360705f | 30 | |
399c5f96 | 31 | /* |
075dafd2 | 32 | * Implements the logic described in systemd.offline-updates(7). |
399c5f96 LP |
33 | */ |
34 | ||
d360705f LP |
35 | static const char *arg_dest = "/tmp"; |
36 | ||
37 | static int generate_symlink(void) { | |
9194c8e4 | 38 | const char *p = NULL; |
d360705f | 39 | |
6b321a79 | 40 | if (laccess("/system-update", F_OK) < 0) { |
d360705f LP |
41 | if (errno == ENOENT) |
42 | return 0; | |
43 | ||
56f64d95 | 44 | log_error_errno(errno, "Failed to check for system update: %m"); |
d360705f LP |
45 | return -EINVAL; |
46 | } | |
47 | ||
075dafd2 | 48 | p = strjoina(arg_dest, "/" SPECIAL_DEFAULT_TARGET); |
4a62c710 MS |
49 | if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0) |
50 | return log_error_errno(errno, "Failed to create symlink %s: %m", p); | |
d360705f | 51 | |
1cec251c ZJS |
52 | return 1; |
53 | } | |
54 | ||
55 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { | |
56 | assert(key); | |
57 | ||
58 | /* Check if a run level is specified on the kernel command line. The | |
59 | * command line has higher priority than any on-disk configuration, so | |
60 | * it'll make any symlink we create moot. | |
61 | */ | |
62 | ||
63 | if (streq(key, "systemd.unit") && !proc_cmdline_value_missing(key, value)) | |
64 | log_warning("Offline system update overriden by kernel command line systemd.unit= setting"); | |
65 | else if (!value && runlevel_to_target(key)) | |
66 | log_warning("Offline system update overriden by runlevel \"%s\" on the kernel command line", key); | |
67 | ||
d360705f LP |
68 | return 0; |
69 | } | |
70 | ||
71 | int main(int argc, char *argv[]) { | |
1cec251c | 72 | int r, k; |
d360705f | 73 | |
07719a21 LP |
74 | if (argc > 1 && argc != 4) { |
75 | log_error("This program takes three or no arguments."); | |
d360705f LP |
76 | return EXIT_FAILURE; |
77 | } | |
78 | ||
79 | if (argc > 1) | |
07719a21 | 80 | arg_dest = argv[2]; |
d360705f | 81 | |
a6903061 | 82 | log_set_target(LOG_TARGET_SAFE); |
d360705f LP |
83 | log_parse_environment(); |
84 | log_open(); | |
85 | ||
86 | umask(0022); | |
87 | ||
88 | r = generate_symlink(); | |
89 | ||
1cec251c ZJS |
90 | if (r > 0) { |
91 | k = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0); | |
92 | if (k < 0) | |
93 | log_warning_errno(k, "Failed to parse kernel command line, ignoring: %m"); | |
94 | } | |
95 | ||
d360705f LP |
96 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
97 | } |