summaryrefslogtreecommitdiff
path: root/src/load-dropin.c
blob: d869ee0c7650cd347d840be325433574e82aa873 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <dirent.h>
#include <errno.h>

#include "unit.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#include "unit-name.h"

static int iterate_dir(Unit *u, const char *path, UnitDependency dependency) {
        DIR *d;
        struct dirent *de;
        int r;

        assert(u);
        assert(path);

        d = opendir(path);
        if (!d) {

                if (errno == ENOENT)
                        return 0;

                return -errno;
        }

        while ((de = readdir(d))) {
                char *f;

                if (ignore_file(de->d_name))
                        continue;

                f = join(path, "/", de->d_name, NULL);
                if (!f) {
                        r = -ENOMEM;
                        goto finish;
                }

                r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
                free(f);

                if (r < 0)
                        log_error("Cannot add dependency %s to %s, ignoring: %s", de->d_name, u->id, strerror(-r));
        }

        r = 0;

finish:
        closedir(d);
        return r;
}

static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency) {
        int r;
        char *path;

        assert(u);
        assert(unit_path);
        assert(name);
        assert(suffix);

        path = join(unit_path, "/", name, suffix, NULL);
        if (!path)
                return -ENOMEM;

        if (u->manager->unit_path_cache &&
            !set_get(u->manager->unit_path_cache, path))
                r = 0;
        else
                r = iterate_dir(u, path, dependency);
        free(path);

        if (r < 0)
                return r;

        if (u->instance) {
                char *template;
                /* Also try the template dir */

                template = unit_name_template(name);
                if (!template)
                        return -ENOMEM;

                path = join(unit_path, "/", template, suffix, NULL);
                free(template);

                if (!path)
                        return -ENOMEM;

                if (u->manager->unit_path_cache &&
                    !set_get(u->manager->unit_path_cache, path))
                        r = 0;
                else
                        r = iterate_dir(u, path, dependency);
                free(path);

                if (r < 0)
                        return r;
        }

        return 0;
}

int unit_load_dropin(Unit *u) {
        Iterator i;
        char *t;

        assert(u);

        /* Load dependencies from supplementary drop-in directories */

        SET_FOREACH(t, u->names, i) {
                char **p;

                STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
                        int r;

                        r = process_dir(u, *p, t, ".wants", UNIT_WANTS);
                        if (r < 0)
                                return r;

                        r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES);
                        if (r < 0)
                                return r;
                }
        }

        return 0;
}