chiark / gitweb /
journal: when show blob data show length
[elogind.git] / 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                 NULL
61         };
62
63         const char * const data_unit_paths[] = {
64                 "/usr/local/lib/systemd/user",
65                 "/usr/local/share/systemd/user",
66                 USER_DATA_UNIT_PATH,
67                 "/usr/lib/systemd/user",
68                 "/usr/share/systemd/user",
69                 NULL
70         };
71
72         const char *home, *e;
73         char *config_home = NULL, *data_home = NULL;
74         char **config_dirs = NULL, **data_dirs = NULL;
75         char **r = NULL, **t;
76
77         /* Implement the mechanisms defined in
78          *
79          * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
80          *
81          * We look in both the config and the data dirs because we
82          * want to encourage that distributors ship their unit files
83          * as data, and allow overriding as configuration.
84          */
85
86         if (user_config_home(&config_home) < 0)
87                 goto fail;
88
89         home = getenv("HOME");
90
91         if ((e = getenv("XDG_CONFIG_DIRS")))
92                 if (!(config_dirs = strv_split(e, ":")))
93                         goto fail;
94
95         /* We don't treat /etc/xdg/systemd here as the spec
96          * suggests because we assume that that is a link to
97          * /etc/systemd/ anyway. */
98
99         if ((e = getenv("XDG_DATA_HOME"))) {
100                 if (asprintf(&data_home, "%s/systemd/user", e) < 0)
101                         goto fail;
102
103         } else if (home) {
104                 if (asprintf(&data_home, "%s/.local/share/systemd/user", home) < 0)
105                         goto fail;
106
107                 /* There is really no need for two unit dirs in $HOME,
108                  * except to be fully compliant with the XDG spec. We
109                  * now try to link the two dirs, so that we can
110                  * minimize disk seeks a little. Further down we'll
111                  * then filter out this link, if it is actually is
112                  * one. */
113
114                 mkdir_parents(data_home, 0777);
115                 (void) symlink("../../../.config/systemd/user", data_home);
116         }
117
118         if ((e = getenv("XDG_DATA_DIRS")))
119                 data_dirs = strv_split(e, ":");
120         else
121                 data_dirs = strv_new("/usr/local/share",
122                                      "/usr/share",
123                                      NULL);
124
125         if (!data_dirs)
126                 goto fail;
127
128         /* Now merge everything we found. */
129         if (config_home) {
130                 if (!(t = strv_append(r, config_home)))
131                         goto fail;
132                 strv_free(r);
133                 r = t;
134         }
135
136         if (!strv_isempty(config_dirs)) {
137                 if (!(t = strv_merge_concat(r, config_dirs, "/systemd/user")))
138                         goto finish;
139                 strv_free(r);
140                 r = t;
141         }
142
143         if (!(t = strv_merge(r, (char**) config_unit_paths)))
144                 goto fail;
145         strv_free(r);
146         r = t;
147
148         if (data_home) {
149                 if (!(t = strv_append(r, data_home)))
150                         goto fail;
151                 strv_free(r);
152                 r = t;
153         }
154
155         if (!strv_isempty(data_dirs)) {
156                 if (!(t = strv_merge_concat(r, data_dirs, "/systemd/user")))
157                         goto fail;
158                 strv_free(r);
159                 r = t;
160         }
161
162         if (!(t = strv_merge(r, (char**) data_unit_paths)))
163                 goto fail;
164         strv_free(r);
165         r = t;
166
167         if (!strv_path_make_absolute_cwd(r))
168             goto fail;
169
170 finish:
171         free(config_home);
172         strv_free(config_dirs);
173         free(data_home);
174         strv_free(data_dirs);
175
176         return r;
177
178 fail:
179         strv_free(r);
180         r = NULL;
181         goto finish;
182 }
183
184 int lookup_paths_init(LookupPaths *p, ManagerRunningAs running_as, bool personal) {
185         const char *e;
186         char *t;
187
188         assert(p);
189
190         /* First priority is whatever has been passed to us via env
191          * vars */
192         if ((e = getenv("SYSTEMD_UNIT_PATH")))
193                 if (!(p->unit_path = split_path_and_make_absolute(e)))
194                         return -ENOMEM;
195
196         if (strv_isempty(p->unit_path)) {
197
198                 /* Nothing is set, so let's figure something out. */
199                 strv_free(p->unit_path);
200
201                 if (running_as == MANAGER_USER) {
202
203                         if (personal)
204                                 p->unit_path = user_dirs();
205                         else
206                                 p->unit_path = strv_new(
207                                                 /* If you modify this you also want to modify
208                                                  * systemduserunitpath= in systemd.pc.in, and
209                                                  * the arrays in user_dirs() above! */
210                                                 "/run/systemd/user",
211                                                 USER_CONFIG_UNIT_PATH,
212                                                 "/etc/systemd/user",
213                                                 "/usr/local/lib/systemd/user",
214                                                 "/usr/local/share/systemd/user",
215                                                 USER_DATA_UNIT_PATH,
216                                                 "/usr/lib/systemd/user",
217                                                 "/usr/share/systemd/user",
218                                                 NULL);
219
220                         if (!p->unit_path)
221                                 return -ENOMEM;
222
223                 } else
224                         if (!(p->unit_path = strv_new(
225                                               /* If you modify this you also want to modify
226                                                * systemdsystemunitpath= in systemd.pc.in! */
227                                               "/run/systemd/system",
228                                               SYSTEM_CONFIG_UNIT_PATH,
229                                               "/etc/systemd/system",
230                                               "/usr/local/lib/systemd/system",
231                                               "/usr/lib/systemd/system",
232                                               SYSTEM_DATA_UNIT_PATH,
233                                               "/lib/systemd/system",
234                                               NULL)))
235                                 return -ENOMEM;
236         }
237
238         if (p->unit_path)
239                 if (!strv_path_canonicalize(p->unit_path))
240                         return -ENOMEM;
241
242         strv_uniq(p->unit_path);
243         strv_path_remove_empty(p->unit_path);
244
245         if (!strv_isempty(p->unit_path)) {
246
247                 if (!(t = strv_join(p->unit_path, "\n\t")))
248                         return -ENOMEM;
249                 log_debug("Looking for unit files in:\n\t%s", t);
250                 free(t);
251         } else {
252                 log_debug("Ignoring unit files.");
253                 strv_free(p->unit_path);
254                 p->unit_path = NULL;
255         }
256
257         if (running_as == MANAGER_SYSTEM) {
258 #ifdef HAVE_SYSV_COMPAT
259                 /* /etc/init.d/ compatibility does not matter to users */
260
261                 if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
262                         if (!(p->sysvinit_path = split_path_and_make_absolute(e)))
263                                 return -ENOMEM;
264
265                 if (strv_isempty(p->sysvinit_path)) {
266                         strv_free(p->sysvinit_path);
267
268                         if (!(p->sysvinit_path = strv_new(
269                                               SYSTEM_SYSVINIT_PATH,     /* /etc/init.d/ */
270                                               NULL)))
271                                 return -ENOMEM;
272                 }
273
274                 if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
275                         if (!(p->sysvrcnd_path = split_path_and_make_absolute(e)))
276                                 return -ENOMEM;
277
278                 if (strv_isempty(p->sysvrcnd_path)) {
279                         strv_free(p->sysvrcnd_path);
280
281                         if (!(p->sysvrcnd_path = strv_new(
282                                               SYSTEM_SYSVRCND_PATH,     /* /etc/rcN.d/ */
283                                               NULL)))
284                                 return -ENOMEM;
285                 }
286
287                 if (p->sysvinit_path)
288                         if (!strv_path_canonicalize(p->sysvinit_path))
289                                 return -ENOMEM;
290
291                 if (p->sysvrcnd_path)
292                         if (!strv_path_canonicalize(p->sysvrcnd_path))
293                                 return -ENOMEM;
294
295                 strv_uniq(p->sysvinit_path);
296                 strv_uniq(p->sysvrcnd_path);
297
298                 strv_path_remove_empty(p->sysvinit_path);
299                 strv_path_remove_empty(p->sysvrcnd_path);
300
301                 if (!strv_isempty(p->sysvinit_path)) {
302
303                         if (!(t = strv_join(p->sysvinit_path, "\n\t")))
304                                 return -ENOMEM;
305
306                         log_debug("Looking for SysV init scripts in:\n\t%s", t);
307                         free(t);
308                 } else {
309                         log_debug("Ignoring SysV init scripts.");
310                         strv_free(p->sysvinit_path);
311                         p->sysvinit_path = NULL;
312                 }
313
314                 if (!strv_isempty(p->sysvrcnd_path)) {
315
316                         if (!(t = strv_join(p->sysvrcnd_path, "\n\t")))
317                                 return -ENOMEM;
318
319                         log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
320                         free(t);
321                 } else {
322                         log_debug("Ignoring SysV rcN.d links.");
323                         strv_free(p->sysvrcnd_path);
324                         p->sysvrcnd_path = NULL;
325                 }
326 #else
327                 log_debug("Disabled SysV init scripts and rcN.d links support");
328 #endif
329         }
330
331         return 0;
332 }
333
334 void lookup_paths_free(LookupPaths *p) {
335         assert(p);
336
337         strv_free(p->unit_path);
338         p->unit_path = NULL;
339
340 #ifdef HAVE_SYSV_COMPAT
341         strv_free(p->sysvinit_path);
342         strv_free(p->sysvrcnd_path);
343         p->sysvinit_path = p->sysvrcnd_path = NULL;
344 #endif
345 }