src/load-dropin.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dirent.h>
  23 #include <errno.h>
  24
  25 #include "unit.h"
  26 #include "load-dropin.h"
  27 #include "log.h"
  28 #include "strv.h"
  29 #include "unit-name.h"
  30
  31 static int iterate_dir(Unit *u, const char *path, UnitDependency dependency) {
  32         DIR *d;
  33         struct dirent *de;
  34         int r;
  35
  36         assert(u);
  37         assert(path);
  38
  39         if (!(d = opendir(path))) {
  40
  41                 if (errno == ENOENT)
  42                         return 0;
  43
  44                 return -errno;
  45         }
  46
  47         while ((de = readdir(d))) {
  48                 char *f;
  49
  50                 if (ignore_file(de->d_name))
  51                         continue;
  52
  53                 if (asprintf(&f, "%s/%s", path, de->d_name) < 0) {
  54                         r = -ENOMEM;
  55                         goto finish;
  56                 }
  57
  58                 r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
  59                 free(f);
  60
  61                 if (r < 0)
  62                         goto finish;
  63         }
  64
  65         r = 0;
  66
  67 finish:
  68         closedir(d);
  69         return r;
  70 }
  71
  72 static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency) {
  73         int r;
  74         char *path;
  75
  76         assert(u);
  77         assert(unit_path);
  78         assert(name);
  79         assert(suffix);
  80
  81         path = join(unit_path, "/", name, suffix, NULL);
  82         if (!path)
  83                 return -ENOMEM;
  84
  85         if (u->meta.manager->unit_path_cache &&
  86             !set_get(u->meta.manager->unit_path_cache, path))
  87                 r = 0;
  88         else
  89                 r = iterate_dir(u, path, dependency);
  90         free(path);
  91
  92         if (r < 0)
  93                 return r;
  94
  95         if (u->meta.instance) {
  96                 char *template;
  97                 /* Also try the template dir */
  98
  99                 if (!(template = unit_name_template(name)))
 100                         return -ENOMEM;
 101
 102                 r = asprintf(&path, "%s/%s%s", unit_path, template, suffix);
 103                 free(template);
 104
 105                 if (r < 0)
 106                         return -ENOMEM;
 107
 108                 if (u->meta.manager->unit_path_cache &&
 109                     !set_get(u->meta.manager->unit_path_cache, path))
 110                         r = 0;
 111                 else
 112                         r = iterate_dir(u, path, dependency);
 113                 free(path);
 114
 115                 if (r < 0)
 116                         return r;
 117         }
 118
 119         return 0;
 120 }
 121
 122 int unit_load_dropin(Unit *u) {
 123         Iterator i;
 124         char *t;
 125
 126         assert(u);
 127
 128         /* Load dependencies from supplementary drop-in directories */
 129
 130         SET_FOREACH(t, u->meta.names, i) {
 131                 char **p;
 132
 133                 STRV_FOREACH(p, u->meta.manager->lookup_paths.unit_path) {
 134                         int r;
 135
 136                         if ((r = process_dir(u, *p, t, ".wants", UNIT_WANTS)) < 0)
 137                                 return r;
 138
 139                         if ((r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES)) < 0)
 140                                 return r;
 141                 }
 142         }
 143
 144         return 0;
 145 }