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                 f = join(path, "/", de->d_name, NULL);
  54                 if (!f) {
  55                         r = -ENOMEM;
  56                         goto finish;
  57                 }
  58
  59                 r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
  60                 free(f);
  61
  62                 if (r < 0)
  63                         goto finish;
  64         }
  65
  66         r = 0;
  67
  68 finish:
  69         closedir(d);
  70         return r;
  71 }
  72
  73 static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency) {
  74         int r;
  75         char *path;
  76
  77         assert(u);
  78         assert(unit_path);
  79         assert(name);
  80         assert(suffix);
  81
  82         path = join(unit_path, "/", name, suffix, NULL);
  83         if (!path)
  84                 return -ENOMEM;
  85
  86         if (u->meta.manager->unit_path_cache &&
  87             !set_get(u->meta.manager->unit_path_cache, path))
  88                 r = 0;
  89         else
  90                 r = iterate_dir(u, path, dependency);
  91         free(path);
  92
  93         if (r < 0)
  94                 return r;
  95
  96         if (u->meta.instance) {
  97                 char *template;
  98                 /* Also try the template dir */
  99
 100                 if (!(template = unit_name_template(name)))
 101                         return -ENOMEM;
 102
 103                 path = join(unit_path, "/", template, suffix, NULL);
 104                 free(template);
 105
 106                 if (!path)
 107                         return -ENOMEM;
 108
 109                 if (u->meta.manager->unit_path_cache &&
 110                     !set_get(u->meta.manager->unit_path_cache, path))
 111                         r = 0;
 112                 else
 113                         r = iterate_dir(u, path, dependency);
 114                 free(path);
 115
 116                 if (r < 0)
 117                         return r;
 118         }
 119
 120         return 0;
 121 }
 122
 123 int unit_load_dropin(Unit *u) {
 124         Iterator i;
 125         char *t;
 126
 127         assert(u);
 128
 129         /* Load dependencies from supplementary drop-in directories */
 130
 131         SET_FOREACH(t, u->meta.names, i) {
 132                 char **p;
 133
 134                 STRV_FOREACH(p, u->meta.manager->lookup_paths.unit_path) {
 135                         int r;
 136
 137                         if ((r = process_dir(u, *p, t, ".wants", UNIT_WANTS)) < 0)
 138                                 return r;
 139
 140                         if ((r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES)) < 0)
 141                                 return r;
 142                 }
 143         }
 144
 145         return 0;
 146 }