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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7334b09 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
a7334b09 LP |
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 | |
5430f7f2 | 15 | Lesser General Public License for more details. |
a7334b09 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
0301abf4 | 21 | |
cf0fbc49 | 22 | #include "conf-parser.h" |
317cd27a | 23 | #include "fs-util.h" |
5cb5a6ff | 24 | #include "load-dropin.h" |
cf0fbc49 | 25 | #include "load-fragment.h" |
b952f2e1 | 26 | #include "log.h" |
95778782 | 27 | #include "stat-util.h" |
317cd27a | 28 | #include "string-util.h" |
036643a2 | 29 | #include "strv.h" |
9e2f7c11 | 30 | #include "unit-name.h" |
cf0fbc49 | 31 | #include "unit.h" |
8afbb8e1 | 32 | |
45f4238a | 33 | static int unit_name_compatible(const char *a, const char *b) { |
317cd27a ZJS |
34 | _cleanup_free_ char *prefix = NULL; |
35 | int r; | |
36 | ||
37 | /* the straightforward case: the symlink name matches the target */ | |
38 | if (streq(a, b)) | |
45f4238a | 39 | return 1; |
317cd27a ZJS |
40 | |
41 | r = unit_name_template(a, &prefix); | |
e450032f ZJS |
42 | if (r == -EINVAL) |
43 | /* not a template */ | |
45f4238a | 44 | return 0; |
e450032f ZJS |
45 | if (r < 0) |
46 | /* oom, or some other failure. Just skip the warning. */ | |
45f4238a | 47 | return r; |
317cd27a ZJS |
48 | |
49 | /* an instance name points to a target that is just the template name */ | |
50 | if (streq(prefix, b)) | |
45f4238a | 51 | return 1; |
317cd27a | 52 | |
45f4238a | 53 | return 0; |
317cd27a ZJS |
54 | } |
55 | ||
95778782 ZJS |
56 | static int process_deps(Unit *u, UnitDependency dependency, const char *dir_suffix) { |
57 | _cleanup_strv_free_ char **paths = NULL; | |
58 | char **p; | |
9e2f7c11 LP |
59 | int r; |
60 | ||
95778782 ZJS |
61 | r = unit_file_find_dropin_paths(NULL, |
62 | u->manager->lookup_paths.search_path, | |
63 | u->manager->unit_path_cache, | |
64 | dir_suffix, | |
65 | NULL, | |
66 | u->names, | |
67 | &paths); | |
1a7f1b38 | 68 | if (r < 0) |
95778782 ZJS |
69 | return r; |
70 | ||
71 | STRV_FOREACH(p, paths) { | |
72 | const char *entry; | |
317cd27a | 73 | _cleanup_free_ char *target = NULL; |
95778782 ZJS |
74 | |
75 | entry = basename(*p); | |
76 | ||
5be5d39b ZJS |
77 | if (null_or_empty_path(*p) > 0) { |
78 | /* an error usually means an invalid symlink, which is not a mask */ | |
79 | log_unit_debug(u, "%s dependency on %s is masked by %s, ignoring.", | |
80 | unit_dependency_to_string(dependency), entry, *p); | |
81 | continue; | |
82 | } | |
83 | ||
95778782 ZJS |
84 | r = is_symlink(*p); |
85 | if (r < 0) { | |
86 | log_unit_warning_errno(u, r, "%s dropin %s unreadable, ignoring: %m", | |
87 | unit_dependency_to_string(dependency), *p); | |
88 | continue; | |
89 | } | |
90 | if (r == 0) { | |
91 | log_unit_warning(u, "%s dependency dropin %s is not a symlink, ignoring.", | |
92 | unit_dependency_to_string(dependency), *p); | |
93 | continue; | |
94 | } | |
95 | ||
317cd27a ZJS |
96 | if (!unit_name_is_valid(entry, UNIT_NAME_ANY)) { |
97 | log_unit_warning(u, "%s dependency dropin %s is not a valid unit name, ignoring.", | |
98 | unit_dependency_to_string(dependency), *p); | |
99 | continue; | |
100 | } | |
101 | ||
102 | r = readlink_malloc(*p, &target); | |
103 | if (r < 0) { | |
104 | log_unit_warning_errno(u, r, "readlink(\"%s\") failed, ignoring: %m", *p); | |
105 | continue; | |
106 | } | |
107 | ||
108 | /* We don't treat this as an error, especially because we didn't check this for a | |
109 | * long time. Nevertheless, we warn, because such mismatch can be mighty confusing. */ | |
45f4238a LP |
110 | r = unit_name_compatible(entry, basename(target)); |
111 | if (r < 0) { | |
112 | log_unit_warning_errno(u, r, "Can't check if names %s and %s are compatible, ignoring: %m", entry, basename(target)); | |
113 | continue; | |
114 | } | |
115 | if (r == 0) | |
317cd27a ZJS |
116 | log_unit_warning(u, "%s dependency dropin %s target %s has different name", |
117 | unit_dependency_to_string(dependency), *p, target); | |
95778782 | 118 | |
eef85c4a | 119 | r = unit_add_dependency_by_name(u, dependency, entry, *p, true, UNIT_DEPENDENCY_FILE); |
95778782 | 120 | if (r < 0) |
800f478c LP |
121 | log_unit_warning_errno(u, r, "Cannot add %s dependency on %s, ignoring: %m", |
122 | unit_dependency_to_string(dependency), entry); | |
95778782 | 123 | } |
9e2f7c11 | 124 | |
8afbb8e1 | 125 | return 0; |
9e2f7c11 | 126 | } |
5cb5a6ff | 127 | |
ae7a7182 | 128 | int unit_load_dropin(Unit *u) { |
d7e0da1d | 129 | _cleanup_strv_free_ char **l = NULL; |
95778782 | 130 | char **f; |
1a7f1b38 | 131 | int r; |
99f08d14 LP |
132 | |
133 | assert(u); | |
134 | ||
95778782 ZJS |
135 | /* Load dependencies from .wants and .requires directories */ |
136 | r = process_deps(u, UNIT_WANTS, ".wants"); | |
137 | if (r < 0) | |
138 | return r; | |
99f08d14 | 139 | |
95778782 ZJS |
140 | r = process_deps(u, UNIT_REQUIRES, ".requires"); |
141 | if (r < 0) | |
142 | return r; | |
0301abf4 | 143 | |
95778782 | 144 | /* Load .conf dropins */ |
d7e0da1d | 145 | r = unit_find_dropin_paths(u, &l); |
1a7f1b38 | 146 | if (r <= 0) |
ae7a7182 | 147 | return 0; |
5926ccca | 148 | |
d7e0da1d LP |
149 | if (!u->dropin_paths) { |
150 | u->dropin_paths = l; | |
151 | l = NULL; | |
152 | } else { | |
153 | r = strv_extend_strv(&u->dropin_paths, l, true); | |
154 | if (r < 0) | |
155 | return log_oom(); | |
156 | } | |
157 | ||
bcde742e LP |
158 | STRV_FOREACH(f, u->dropin_paths) |
159 | (void) config_parse(u->id, *f, NULL, | |
160 | UNIT_VTABLE(u)->sections, | |
161 | config_item_perf_lookup, load_fragment_gperf_lookup, | |
162 | 0, u); | |
5926ccca | 163 | |
ae7a7182 OS |
164 | u->dropin_mtime = now(CLOCK_REALTIME); |
165 | ||
5cb5a6ff LP |
166 | return 0; |
167 | } |