src/path-lookup.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 <assert.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <errno.h>
  27
  28 #include "util.h"
  29 #include "strv.h"
  30
  31 #include "path-lookup.h"
  32
  33 int user_config_home(char **config_home) {
  34         const char *e;
  35
  36         if ((e = getenv("XDG_CONFIG_HOME"))) {
  37                 if (asprintf(config_home, "%s/systemd/user", e) < 0)
  38                         return -ENOMEM;
  39
  40                 return 1;
  41         } else {
  42                 const char *home;
  43
  44                 if ((home = getenv("HOME"))) {
  45                         if (asprintf(config_home, "%s/.config/systemd/user", home) < 0)
  46                                 return -ENOMEM;
  47
  48                         return 1;
  49                 }
  50         }
  51
  52         return 0;
  53 }
  54
  55 static char** user_dirs(void) {
  56         const char * const config_unit_paths[] = {
  57                 "/run/systemd/user",
  58                 USER_CONFIG_UNIT_PATH,
  59                 "/etc/systemd/user"
  60         };
  61
  62         const char * const data_unit_paths[] = {
  63                 "/usr/local/lib/systemd/user",
  64                 "/usr/local/share/systemd/user",
  65                 USER_DATA_UNIT_PATH,
  66                 "/usr/lib/systemd/user",
  67                 "/usr/share/systemd/user"
  68         };
  69
  70         const char *home, *e;
  71         char *config_home = NULL, *data_home = NULL;
  72         char **config_dirs = NULL, **data_dirs = NULL;
  73         char **r = NULL, **t;
  74
  75         /* Implement the mechanisms defined in
  76          *
  77          * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
  78          *
  79          * We look in both the config and the data dirs because we
  80          * want to encourage that distributors ship their unit files
  81          * as data, and allow overriding as configuration.
  82          */
  83
  84         if (user_config_home(&config_home) < 0)
  85                 goto fail;
  86
  87         home = getenv("HOME");
  88
  89         if ((e = getenv("XDG_CONFIG_DIRS")))
  90                 if (!(config_dirs = strv_split(e, ":")))
  91                         goto fail;
  92
  93         /* We don't treat /etc/xdg/systemd here as the spec
  94          * suggests because we assume that that is a link to
  95          * /etc/systemd/ anyway. */
  96
  97         if ((e = getenv("XDG_DATA_HOME"))) {
  98                 if (asprintf(&data_home, "%s/systemd/user", e) < 0)
  99                         goto fail;
 100
 101         } else if (home) {
 102                 if (asprintf(&data_home, "%s/.local/share/systemd/user", home) < 0)
 103                         goto fail;
 104
 105                 /* There is really no need for two unit dirs in $HOME,
 106                  * except to be fully compliant with the XDG spec. We
 107                  * now try to link the two dirs, so that we can
 108                  * minimize disk seeks a little. Further down we'll
 109                  * then filter out this link, if it is actually is
 110                  * one. */
 111
 112                 mkdir_parents(data_home, 0777);
 113                 (void) symlink("../../../.config/systemd/user", data_home);
 114         }
 115
 116         if ((e = getenv("XDG_DATA_DIRS")))
 117                 data_dirs = strv_split(e, ":");
 118         else
 119                 data_dirs = strv_new("/usr/local/share",
 120                                      "/usr/share",
 121                                      NULL);
 122
 123         if (!data_dirs)
 124                 goto fail;
 125
 126         /* Now merge everything we found. */
 127         if (config_home) {
 128                 if (!(t = strv_append(r, config_home)))
 129                         goto fail;
 130                 strv_free(r);
 131                 r = t;
 132         }
 133
 134         if (!strv_isempty(config_dirs)) {
 135                 if (!(t = strv_merge_concat(r, config_dirs, "/systemd/user")))
 136                         goto finish;
 137                 strv_free(r);
 138                 r = t;
 139         }
 140
 141         if (!(t = strv_merge(r, (char**) config_unit_paths)))
 142                 goto fail;
 143         strv_free(r);
 144         r = t;
 145
 146         if (data_home) {
 147                 if (!(t = strv_append(r, data_home)))
 148                         goto fail;
 149                 strv_free(r);
 150                 r = t;
 151         }
 152
 153         if (!strv_isempty(data_dirs)) {
 154                 if (!(t = strv_merge_concat(r, data_dirs, "/systemd/user")))
 155                         goto fail;
 156                 strv_free(r);
 157                 r = t;
 158         }
 159
 160         if (!(t = strv_merge(r, (char**) data_unit_paths)))
 161                 goto fail;
 162         strv_free(r);
 163         r = t;
 164
 165         if (!strv_path_make_absolute_cwd(r))
 166             goto fail;
 167
 168 finish:
 169         free(config_home);
 170         strv_free(config_dirs);
 171         free(data_home);
 172         strv_free(data_dirs);
 173
 174         return r;
 175
 176 fail:
 177         strv_free(r);
 178         r = NULL;
 179         goto finish;
 180 }
 181
 182 int lookup_paths_init(LookupPaths *p, ManagerRunningAs running_as, bool personal) {
 183         const char *e;
 184         char *t;
 185
 186         assert(p);
 187
 188         /* First priority is whatever has been passed to us via env
 189          * vars */
 190         if ((e = getenv("SYSTEMD_UNIT_PATH")))
 191                 if (!(p->unit_path = split_path_and_make_absolute(e)))
 192                         return -ENOMEM;
 193
 194         if (strv_isempty(p->unit_path)) {
 195
 196                 /* Nothing is set, so let's figure something out. */
 197                 strv_free(p->unit_path);
 198
 199                 if (running_as == MANAGER_USER) {
 200
 201                         if (personal)
 202                                 p->unit_path = user_dirs();
 203                         else
 204                                 p->unit_path = strv_new(
 205                                                 /* If you modify this you also want to modify
 206                                                  * systemduserunitpath= in systemd.pc.in, and
 207                                                  * the arrays in user_dirs() above! */
 208                                                 "/run/systemd/user",
 209                                                 USER_CONFIG_UNIT_PATH,
 210                                                 "/etc/systemd/system",
 211                                                 "/usr/local/lib/systemd/user",
 212                                                 "/usr/local/share/systemd/user",
 213                                                 USER_DATA_UNIT_PATH,
 214                                                 "/usr/lib/systemd/user",
 215                                                 "/usr/share/systemd/user",
 216                                                 NULL);
 217
 218                         if (!p->unit_path)
 219                                 return -ENOMEM;
 220
 221                 } else
 222                         if (!(p->unit_path = strv_new(
 223                                               /* If you modify this you also want to modify
 224                                                * systemdsystemunitpath= in systemd.pc.in! */
 225                                               "/run/systemd/system",
 226                                               SYSTEM_CONFIG_UNIT_PATH,
 227                                               "/etc/systemd/system",
 228                                               "/usr/local/lib/systemd/system",
 229                                               "/usr/lib/systemd/system",
 230                                               SYSTEM_DATA_UNIT_PATH,
 231                                               "/lib/systemd/system",
 232                                               NULL)))
 233                                 return -ENOMEM;
 234         }
 235
 236         if (p->unit_path)
 237                 if (!strv_path_canonicalize(p->unit_path))
 238                         return -ENOMEM;
 239
 240         strv_uniq(p->unit_path);
 241         strv_path_remove_empty(p->unit_path);
 242
 243         if (!strv_isempty(p->unit_path)) {
 244
 245                 if (!(t = strv_join(p->unit_path, "\n\t")))
 246                         return -ENOMEM;
 247                 log_debug("Looking for unit files in:\n\t%s", t);
 248                 free(t);
 249         } else {
 250                 log_debug("Ignoring unit files.");
 251                 strv_free(p->unit_path);
 252                 p->unit_path = NULL;
 253         }
 254
 255         if (running_as == MANAGER_SYSTEM) {
 256 #ifdef HAVE_SYSV_COMPAT
 257                 /* /etc/init.d/ compatibility does not matter to users */
 258
 259                 if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
 260                         if (!(p->sysvinit_path = split_path_and_make_absolute(e)))
 261                                 return -ENOMEM;
 262
 263                 if (strv_isempty(p->sysvinit_path)) {
 264                         strv_free(p->sysvinit_path);
 265
 266                         if (!(p->sysvinit_path = strv_new(
 267                                               SYSTEM_SYSVINIT_PATH,     /* /etc/init.d/ */
 268                                               NULL)))
 269                                 return -ENOMEM;
 270                 }
 271
 272                 if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
 273                         if (!(p->sysvrcnd_path = split_path_and_make_absolute(e)))
 274                                 return -ENOMEM;
 275
 276                 if (strv_isempty(p->sysvrcnd_path)) {
 277                         strv_free(p->sysvrcnd_path);
 278
 279                         if (!(p->sysvrcnd_path = strv_new(
 280                                               SYSTEM_SYSVRCND_PATH,     /* /etc/rcN.d/ */
 281                                               NULL)))
 282                                 return -ENOMEM;
 283                 }
 284
 285                 if (p->sysvinit_path)
 286                         if (!strv_path_canonicalize(p->sysvinit_path))
 287                                 return -ENOMEM;
 288
 289                 if (p->sysvrcnd_path)
 290                         if (!strv_path_canonicalize(p->sysvrcnd_path))
 291                                 return -ENOMEM;
 292
 293                 strv_uniq(p->sysvinit_path);
 294                 strv_uniq(p->sysvrcnd_path);
 295
 296                 strv_path_remove_empty(p->sysvinit_path);
 297                 strv_path_remove_empty(p->sysvrcnd_path);
 298
 299                 if (!strv_isempty(p->sysvinit_path)) {
 300
 301                         if (!(t = strv_join(p->sysvinit_path, "\n\t")))
 302                                 return -ENOMEM;
 303
 304                         log_debug("Looking for SysV init scripts in:\n\t%s", t);
 305                         free(t);
 306                 } else {
 307                         log_debug("Ignoring SysV init scripts.");
 308                         strv_free(p->sysvinit_path);
 309                         p->sysvinit_path = NULL;
 310                 }
 311
 312                 if (!strv_isempty(p->sysvrcnd_path)) {
 313
 314                         if (!(t = strv_join(p->sysvrcnd_path, "\n\t")))
 315                                 return -ENOMEM;
 316
 317                         log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
 318                         free(t);
 319                 } else {
 320                         log_debug("Ignoring SysV rcN.d links.");
 321                         strv_free(p->sysvrcnd_path);
 322                         p->sysvrcnd_path = NULL;
 323                 }
 324 #else
 325                 log_debug("Disabled SysV init scripts and rcN.d links support");
 326 #endif
 327         }
 328
 329         return 0;
 330 }
 331
 332 void lookup_paths_free(LookupPaths *p) {
 333         assert(p);
 334
 335         strv_free(p->unit_path);
 336         p->unit_path = NULL;
 337
 338 #ifdef HAVE_SYSV_COMPAT
 339         strv_free(p->sysvinit_path);
 340         strv_free(p->sysvrcnd_path);
 341         p->sysvinit_path = p->sysvrcnd_path = NULL;
 342 #endif
 343 }