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         d = opendir(path);
  40         if (!d) {
  41
  42                 if (errno == ENOENT)
  43                         return 0;
  44
  45                 return -errno;
  46         }
  47
  48         while ((de = readdir(d))) {
  49                 char *f;
  50
  51                 if (ignore_file(de->d_name))
  52                         continue;
  53
  54                 f = join(path, "/", de->d_name, NULL);
  55                 if (!f) {
  56                         r = -ENOMEM;
  57                         goto finish;
  58                 }
  59
  60                 r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
  61                 free(f);
  62
  63                 if (r < 0)
  64                         log_error("Cannot add dependency %s to %s, ignoring: %s", de->d_name, u->id, strerror(-r));
  65         }
  66
  67         r = 0;
  68
  69 finish:
  70         closedir(d);
  71         return r;
  72 }
  73
  74 static int process_dir(Unit *u, const char *unit_path, const char *name, const char *suffix, UnitDependency dependency) {
  75         int r;
  76         char *path;
  77
  78         assert(u);
  79         assert(unit_path);
  80         assert(name);
  81         assert(suffix);
  82
  83         path = join(unit_path, "/", name, suffix, NULL);
  84         if (!path)
  85                 return -ENOMEM;
  86
  87         if (u->manager->unit_path_cache &&
  88             !set_get(u->manager->unit_path_cache, path))
  89                 r = 0;
  90         else
  91                 r = iterate_dir(u, path, dependency);
  92         free(path);
  93
  94         if (r < 0)
  95                 return r;
  96
  97         if (u->instance) {
  98                 char *template;
  99                 /* Also try the template dir */
 100
 101                 template = unit_name_template(name);
 102                 if (!template)
 103                         return -ENOMEM;
 104
 105                 path = join(unit_path, "/", template, suffix, NULL);
 106                 free(template);
 107
 108                 if (!path)
 109                         return -ENOMEM;
 110
 111                 if (u->manager->unit_path_cache &&
 112                     !set_get(u->manager->unit_path_cache, path))
 113                         r = 0;
 114                 else
 115                         r = iterate_dir(u, path, dependency);
 116                 free(path);
 117
 118                 if (r < 0)
 119                         return r;
 120         }
 121
 122         return 0;
 123 }
 124
 125 int unit_load_dropin(Unit *u) {
 126         Iterator i;
 127         char *t;
 128
 129         assert(u);
 130
 131         /* Load dependencies from supplementary drop-in directories */
 132
 133         SET_FOREACH(t, u->names, i) {
 134                 char **p;
 135
 136                 STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
 137                         int r;
 138
 139                         r = process_dir(u, *p, t, ".wants", UNIT_WANTS);
 140                         if (r < 0)
 141                                 return r;
 142
 143                         r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES);
 144                         if (r < 0)
 145                                 return r;
 146                 }
 147         }
 148
 149         return 0;
 150 }