1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include "conf-parser.h"
4 #include "fs-util.h"
5 #include "load-dropin.h"
6 #include "load-fragment.h"
7 #include "log.h"
8 #include "stat-util.h"
9 #include "string-util.h"
10 #include "strv.h"
11 #include "unit-name.h"
12 #include "unit.h"
13
process_deps(Unit * u,UnitDependency dependency,const char * dir_suffix)14 static int process_deps(Unit *u, UnitDependency dependency, const char *dir_suffix) {
15 _cleanup_strv_free_ char **paths = NULL;
16 int r;
17
18 r = unit_file_find_dropin_paths(NULL,
19 u->manager->lookup_paths.search_path,
20 u->manager->unit_path_cache,
21 dir_suffix, NULL,
22 u->id, u->aliases,
23 &paths);
24 if (r < 0)
25 return r;
26
27 STRV_FOREACH(p, paths) {
28 _cleanup_free_ char *target = NULL;
29 const char *entry;
30
31 entry = basename(*p);
32
33 if (null_or_empty_path(*p) > 0) {
34 /* an error usually means an invalid symlink, which is not a mask */
35 log_unit_debug(u, "%s dependency on %s is masked by %s, ignoring.",
36 unit_dependency_to_string(dependency), entry, *p);
37 continue;
38 }
39
40 r = is_symlink(*p);
41 if (r < 0) {
42 log_unit_warning_errno(u, r, "%s dropin %s unreadable, ignoring: %m",
43 unit_dependency_to_string(dependency), *p);
44 continue;
45 }
46 if (r == 0) {
47 log_unit_warning(u, "%s dependency dropin %s is not a symlink, ignoring.",
48 unit_dependency_to_string(dependency), *p);
49 continue;
50 }
51
52 if (!unit_name_is_valid(entry, UNIT_NAME_ANY)) {
53 log_unit_warning(u, "%s dependency dropin %s is not a valid unit name, ignoring.",
54 unit_dependency_to_string(dependency), *p);
55 continue;
56 }
57
58 r = readlink_malloc(*p, &target);
59 if (r < 0) {
60 log_unit_warning_errno(u, r, "readlink(\"%s\") failed, ignoring: %m", *p);
61 continue;
62 }
63
64 /* We don't treat this as an error, especially because we didn't check this for a
65 * long time. Nevertheless, we warn, because such mismatch can be mighty confusing. */
66 r = unit_symlink_name_compatible(entry, basename(target), u->instance);
67 if (r < 0) {
68 log_unit_warning_errno(u, r, "Can't check if names %s and %s are compatible, ignoring: %m",
69 entry, basename(target));
70 continue;
71 }
72 if (r == 0)
73 log_unit_warning(u, "%s dependency dropin %s target %s has different name",
74 unit_dependency_to_string(dependency), *p, target);
75
76 r = unit_add_dependency_by_name(u, dependency, entry, true, UNIT_DEPENDENCY_FILE);
77 if (r < 0)
78 log_unit_warning_errno(u, r, "Cannot add %s dependency on %s, ignoring: %m",
79 unit_dependency_to_string(dependency), entry);
80 }
81
82 return 0;
83 }
84
unit_load_dropin(Unit * u)85 int unit_load_dropin(Unit *u) {
86 _cleanup_strv_free_ char **l = NULL;
87 int r;
88
89 assert(u);
90
91 /* Load dependencies from .wants and .requires directories */
92 r = process_deps(u, UNIT_WANTS, ".wants");
93 if (r < 0)
94 return r;
95
96 r = process_deps(u, UNIT_REQUIRES, ".requires");
97 if (r < 0)
98 return r;
99
100 /* Load .conf dropins */
101 r = unit_find_dropin_paths(u, &l);
102 if (r <= 0)
103 return 0;
104
105 if (!u->dropin_paths)
106 u->dropin_paths = TAKE_PTR(l);
107 else {
108 r = strv_extend_strv(&u->dropin_paths, l, true);
109 if (r < 0)
110 return log_oom();
111 }
112
113 u->dropin_mtime = 0;
114 STRV_FOREACH(f, u->dropin_paths) {
115 struct stat st;
116
117 r = config_parse(u->id, *f, NULL,
118 UNIT_VTABLE(u)->sections,
119 config_item_perf_lookup, load_fragment_gperf_lookup,
120 0, u, &st);
121 if (r > 0)
122 u->dropin_mtime = MAX(u->dropin_mtime, timespec_load(&st.st_mtim));
123 }
124
125 return 0;
126 }
127