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a7334b09 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
a7334b09 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
0301abf4 | 20 | |
cf0fbc49 | 21 | #include "conf-parser.h" |
317cd27a | 22 | #include "fs-util.h" |
5cb5a6ff | 23 | #include "load-dropin.h" |
cf0fbc49 | 24 | #include "load-fragment.h" |
b952f2e1 | 25 | #include "log.h" |
95778782 | 26 | #include "stat-util.h" |
317cd27a | 27 | #include "string-util.h" |
036643a2 | 28 | #include "strv.h" |
9e2f7c11 | 29 | #include "unit-name.h" |
cf0fbc49 | 30 | #include "unit.h" |
8afbb8e1 | 31 | |
45f4238a | 32 | static int unit_name_compatible(const char *a, const char *b) { |
317cd27a ZJS |
33 | _cleanup_free_ char *prefix = NULL; |
34 | int r; | |
35 | ||
36 | /* the straightforward case: the symlink name matches the target */ | |
37 | if (streq(a, b)) | |
45f4238a | 38 | return 1; |
317cd27a ZJS |
39 | |
40 | r = unit_name_template(a, &prefix); | |
e450032f ZJS |
41 | if (r == -EINVAL) |
42 | /* not a template */ | |
45f4238a | 43 | return 0; |
e450032f ZJS |
44 | if (r < 0) |
45 | /* oom, or some other failure. Just skip the warning. */ | |
45f4238a | 46 | return r; |
317cd27a ZJS |
47 | |
48 | /* an instance name points to a target that is just the template name */ | |
49 | if (streq(prefix, b)) | |
45f4238a | 50 | return 1; |
317cd27a | 51 | |
45f4238a | 52 | return 0; |
317cd27a ZJS |
53 | } |
54 | ||
95778782 ZJS |
55 | static int process_deps(Unit *u, UnitDependency dependency, const char *dir_suffix) { |
56 | _cleanup_strv_free_ char **paths = NULL; | |
57 | char **p; | |
9e2f7c11 LP |
58 | int r; |
59 | ||
95778782 ZJS |
60 | r = unit_file_find_dropin_paths(NULL, |
61 | u->manager->lookup_paths.search_path, | |
62 | u->manager->unit_path_cache, | |
63 | dir_suffix, | |
64 | NULL, | |
65 | u->names, | |
66 | &paths); | |
1a7f1b38 | 67 | if (r < 0) |
95778782 ZJS |
68 | return r; |
69 | ||
70 | STRV_FOREACH(p, paths) { | |
71 | const char *entry; | |
317cd27a | 72 | _cleanup_free_ char *target = NULL; |
95778782 ZJS |
73 | |
74 | entry = basename(*p); | |
75 | ||
5be5d39b ZJS |
76 | if (null_or_empty_path(*p) > 0) { |
77 | /* an error usually means an invalid symlink, which is not a mask */ | |
78 | log_unit_debug(u, "%s dependency on %s is masked by %s, ignoring.", | |
79 | unit_dependency_to_string(dependency), entry, *p); | |
80 | continue; | |
81 | } | |
82 | ||
95778782 ZJS |
83 | r = is_symlink(*p); |
84 | if (r < 0) { | |
85 | log_unit_warning_errno(u, r, "%s dropin %s unreadable, ignoring: %m", | |
86 | unit_dependency_to_string(dependency), *p); | |
87 | continue; | |
88 | } | |
89 | if (r == 0) { | |
90 | log_unit_warning(u, "%s dependency dropin %s is not a symlink, ignoring.", | |
91 | unit_dependency_to_string(dependency), *p); | |
92 | continue; | |
93 | } | |
94 | ||
317cd27a ZJS |
95 | if (!unit_name_is_valid(entry, UNIT_NAME_ANY)) { |
96 | log_unit_warning(u, "%s dependency dropin %s is not a valid unit name, ignoring.", | |
97 | unit_dependency_to_string(dependency), *p); | |
98 | continue; | |
99 | } | |
100 | ||
101 | r = readlink_malloc(*p, &target); | |
102 | if (r < 0) { | |
103 | log_unit_warning_errno(u, r, "readlink(\"%s\") failed, ignoring: %m", *p); | |
104 | continue; | |
105 | } | |
106 | ||
107 | /* We don't treat this as an error, especially because we didn't check this for a | |
108 | * long time. Nevertheless, we warn, because such mismatch can be mighty confusing. */ | |
45f4238a LP |
109 | r = unit_name_compatible(entry, basename(target)); |
110 | if (r < 0) { | |
111 | log_unit_warning_errno(u, r, "Can't check if names %s and %s are compatible, ignoring: %m", entry, basename(target)); | |
112 | continue; | |
113 | } | |
114 | if (r == 0) | |
317cd27a ZJS |
115 | log_unit_warning(u, "%s dependency dropin %s target %s has different name", |
116 | unit_dependency_to_string(dependency), *p, target); | |
95778782 | 117 | |
eef85c4a | 118 | r = unit_add_dependency_by_name(u, dependency, entry, *p, true, UNIT_DEPENDENCY_FILE); |
95778782 ZJS |
119 | if (r < 0) |
120 | log_unit_error_errno(u, r, "cannot add %s dependency on %s, ignoring: %m", | |
121 | unit_dependency_to_string(dependency), entry); | |
122 | } | |
9e2f7c11 | 123 | |
8afbb8e1 | 124 | return 0; |
9e2f7c11 | 125 | } |
5cb5a6ff | 126 | |
ae7a7182 | 127 | int unit_load_dropin(Unit *u) { |
d7e0da1d | 128 | _cleanup_strv_free_ char **l = NULL; |
95778782 | 129 | char **f; |
1a7f1b38 | 130 | int r; |
99f08d14 LP |
131 | |
132 | assert(u); | |
133 | ||
95778782 ZJS |
134 | /* Load dependencies from .wants and .requires directories */ |
135 | r = process_deps(u, UNIT_WANTS, ".wants"); | |
136 | if (r < 0) | |
137 | return r; | |
99f08d14 | 138 | |
95778782 ZJS |
139 | r = process_deps(u, UNIT_REQUIRES, ".requires"); |
140 | if (r < 0) | |
141 | return r; | |
0301abf4 | 142 | |
95778782 | 143 | /* Load .conf dropins */ |
d7e0da1d | 144 | r = unit_find_dropin_paths(u, &l); |
1a7f1b38 | 145 | if (r <= 0) |
ae7a7182 | 146 | return 0; |
5926ccca | 147 | |
d7e0da1d LP |
148 | if (!u->dropin_paths) { |
149 | u->dropin_paths = l; | |
150 | l = NULL; | |
151 | } else { | |
152 | r = strv_extend_strv(&u->dropin_paths, l, true); | |
153 | if (r < 0) | |
154 | return log_oom(); | |
155 | } | |
156 | ||
bcde742e LP |
157 | STRV_FOREACH(f, u->dropin_paths) |
158 | (void) config_parse(u->id, *f, NULL, | |
159 | UNIT_VTABLE(u)->sections, | |
160 | config_item_perf_lookup, load_fragment_gperf_lookup, | |
161 | 0, u); | |
5926ccca | 162 | |
ae7a7182 OS |
163 | u->dropin_mtime = now(CLOCK_REALTIME); |
164 | ||
5cb5a6ff LP |
165 | return 0; |
166 | } |