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