431 lines
14 KiB
C
431 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "util.h"
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#include "mkdir.h"
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#include "strv.h"
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#include "path-util.h"
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#include "path-lookup.h"
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static const char* const systemd_running_as_table[_SYSTEMD_RUNNING_AS_MAX] = {
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[SYSTEMD_SYSTEM] = "system",
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[SYSTEMD_USER] = "user"
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};
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DEFINE_STRING_TABLE_LOOKUP(systemd_running_as, SystemdRunningAs);
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int user_config_home(char **config_home) {
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const char *e;
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e = getenv("XDG_CONFIG_HOME");
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if (e) {
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if (asprintf(config_home, "%s/systemd/user", e) < 0)
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return -ENOMEM;
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return 1;
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} else {
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const char *home;
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home = getenv("HOME");
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if (home) {
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if (asprintf(config_home, "%s/.config/systemd/user", home) < 0)
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return -ENOMEM;
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return 1;
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}
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}
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return 0;
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}
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static char** user_dirs(
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const char *generator,
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const char *generator_early,
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const char *generator_late) {
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const char * const config_unit_paths[] = {
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USER_CONFIG_UNIT_PATH,
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"/etc/systemd/user",
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"/run/systemd/user",
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NULL
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};
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const char * const data_unit_paths[] = {
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"/usr/local/lib/systemd/user",
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"/usr/local/share/systemd/user",
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USER_DATA_UNIT_PATH,
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"/usr/lib/systemd/user",
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"/usr/share/systemd/user",
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NULL
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};
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const char *home, *e;
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char *config_home = NULL, *data_home = NULL;
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char **config_dirs = NULL, **data_dirs = NULL;
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char **r = NULL, **t;
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/* Implement the mechanisms defined in
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*
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* http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
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*
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* We look in both the config and the data dirs because we
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* want to encourage that distributors ship their unit files
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* as data, and allow overriding as configuration.
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*/
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if (user_config_home(&config_home) < 0)
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goto fail;
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home = getenv("HOME");
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e = getenv("XDG_CONFIG_DIRS");
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if (e) {
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config_dirs = strv_split(e, ":");
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if (!config_dirs)
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goto fail;
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}
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/* We don't treat /etc/xdg/systemd here as the spec
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* suggests because we assume that that is a link to
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* /etc/systemd/ anyway. */
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e = getenv("XDG_DATA_HOME");
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if (e) {
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if (asprintf(&data_home, "%s/systemd/user", e) < 0)
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goto fail;
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} else if (home) {
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if (asprintf(&data_home, "%s/.local/share/systemd/user", home) < 0)
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goto fail;
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/* There is really no need for two unit dirs in $HOME,
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* except to be fully compliant with the XDG spec. We
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* now try to link the two dirs, so that we can
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* minimize disk seeks a little. Further down we'll
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* then filter out this link, if it is actually is
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* one. */
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mkdir_parents_label(data_home, 0777);
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(void) symlink("../../../.config/systemd/user", data_home);
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}
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e = getenv("XDG_DATA_DIRS");
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if (e)
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data_dirs = strv_split(e, ":");
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else
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data_dirs = strv_new("/usr/local/share",
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"/usr/share",
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NULL);
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if (!data_dirs)
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goto fail;
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/* Now merge everything we found. */
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if (generator_early) {
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t = strv_append(r, generator_early);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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}
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if (config_home) {
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t = strv_append(r, config_home);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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}
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if (!strv_isempty(config_dirs)) {
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t = strv_merge_concat(r, config_dirs, "/systemd/user");
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if (!t)
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goto finish;
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strv_free(r);
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r = t;
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}
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t = strv_merge(r, (char**) config_unit_paths);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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if (generator) {
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t = strv_append(r, generator);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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}
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if (data_home) {
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t = strv_append(r, data_home);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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}
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if (!strv_isempty(data_dirs)) {
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t = strv_merge_concat(r, data_dirs, "/systemd/user");
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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}
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t = strv_merge(r, (char**) data_unit_paths);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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if (generator_late) {
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t = strv_append(r, generator_late);
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if (!t)
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goto fail;
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strv_free(r);
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r = t;
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}
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if (!path_strv_make_absolute_cwd(r))
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goto fail;
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finish:
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free(config_home);
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strv_free(config_dirs);
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free(data_home);
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strv_free(data_dirs);
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return r;
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fail:
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strv_free(r);
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r = NULL;
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goto finish;
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}
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int lookup_paths_init(
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LookupPaths *p,
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SystemdRunningAs running_as,
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bool personal,
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const char *generator,
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const char *generator_early,
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const char *generator_late) {
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const char *e;
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char *t;
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assert(p);
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/* First priority is whatever has been passed to us via env
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* vars */
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e = getenv("SYSTEMD_UNIT_PATH");
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if (e) {
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p->unit_path = path_split_and_make_absolute(e);
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if (!p->unit_path)
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return -ENOMEM;
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} else
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p->unit_path = NULL;
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if (strv_isempty(p->unit_path)) {
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/* Nothing is set, so let's figure something out. */
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strv_free(p->unit_path);
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/* For the user units we include share/ in the search
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* path in order to comply with the XDG basedir
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* spec. For the system stuff we avoid such
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* nonsense. OTOH we include /lib in the search path
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* for the system stuff but avoid it for user
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* stuff. */
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if (running_as == SYSTEMD_USER) {
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if (personal)
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p->unit_path = user_dirs(generator, generator_early, generator_late);
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else
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p->unit_path = strv_new(
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/* If you modify this you also want to modify
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* systemduserunitpath= in systemd.pc.in, and
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* the arrays in user_dirs() above! */
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STRV_IFNOTNULL(generator_early),
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USER_CONFIG_UNIT_PATH,
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"/etc/systemd/user",
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"/run/systemd/user",
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STRV_IFNOTNULL(generator),
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"/usr/local/lib/systemd/user",
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"/usr/local/share/systemd/user",
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USER_DATA_UNIT_PATH,
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"/usr/lib/systemd/user",
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"/usr/share/systemd/user",
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STRV_IFNOTNULL(generator_late),
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NULL);
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if (!p->unit_path)
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return -ENOMEM;
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} else {
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p->unit_path = strv_new(
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/* If you modify this you also want to modify
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* systemdsystemunitpath= in systemd.pc.in! */
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STRV_IFNOTNULL(generator_early),
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SYSTEM_CONFIG_UNIT_PATH,
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"/etc/systemd/system",
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"/run/systemd/system",
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STRV_IFNOTNULL(generator),
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"/usr/local/lib/systemd/system",
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SYSTEM_DATA_UNIT_PATH,
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"/usr/lib/systemd/system",
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#ifdef HAVE_SPLIT_USR
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"/lib/systemd/system",
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#endif
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STRV_IFNOTNULL(generator_late),
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NULL);
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if (!p->unit_path)
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return -ENOMEM;
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}
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}
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if (!path_strv_canonicalize(p->unit_path))
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return -ENOMEM;
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strv_uniq(p->unit_path);
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path_strv_remove_empty(p->unit_path);
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if (!strv_isempty(p->unit_path)) {
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t = strv_join(p->unit_path, "\n\t");
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if (!t)
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return -ENOMEM;
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log_debug("Looking for unit files in:\n\t%s", t);
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free(t);
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} else {
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log_debug("Ignoring unit files.");
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strv_free(p->unit_path);
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p->unit_path = NULL;
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}
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if (running_as == SYSTEMD_SYSTEM) {
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#ifdef HAVE_SYSV_COMPAT
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/* /etc/init.d/ compatibility does not matter to users */
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e = getenv("SYSTEMD_SYSVINIT_PATH");
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if (e) {
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p->sysvinit_path = path_split_and_make_absolute(e);
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if (!p->sysvinit_path)
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return -ENOMEM;
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} else
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p->sysvinit_path = NULL;
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if (strv_isempty(p->sysvinit_path)) {
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strv_free(p->sysvinit_path);
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p->sysvinit_path = strv_new(
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SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
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NULL);
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if (!p->sysvinit_path)
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return -ENOMEM;
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}
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e = getenv("SYSTEMD_SYSVRCND_PATH");
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if (e) {
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p->sysvrcnd_path = path_split_and_make_absolute(e);
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if (!p->sysvrcnd_path)
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return -ENOMEM;
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} else
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p->sysvrcnd_path = NULL;
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if (strv_isempty(p->sysvrcnd_path)) {
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strv_free(p->sysvrcnd_path);
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p->sysvrcnd_path = strv_new(
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SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
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NULL);
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if (!p->sysvrcnd_path)
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return -ENOMEM;
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}
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if (!path_strv_canonicalize(p->sysvinit_path))
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return -ENOMEM;
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if (!path_strv_canonicalize(p->sysvrcnd_path))
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return -ENOMEM;
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strv_uniq(p->sysvinit_path);
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strv_uniq(p->sysvrcnd_path);
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path_strv_remove_empty(p->sysvinit_path);
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path_strv_remove_empty(p->sysvrcnd_path);
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if (!strv_isempty(p->sysvinit_path)) {
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t = strv_join(p->sysvinit_path, "\n\t");
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if (!t)
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return -ENOMEM;
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log_debug("Looking for SysV init scripts in:\n\t%s", t);
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free(t);
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} else {
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log_debug("Ignoring SysV init scripts.");
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strv_free(p->sysvinit_path);
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p->sysvinit_path = NULL;
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}
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if (!strv_isempty(p->sysvrcnd_path)) {
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t = strv_join(p->sysvrcnd_path, "\n\t");
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if (!t)
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return -ENOMEM;
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log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
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free(t);
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} else {
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log_debug("Ignoring SysV rcN.d links.");
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strv_free(p->sysvrcnd_path);
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p->sysvrcnd_path = NULL;
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}
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#else
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log_debug("Disabled SysV init scripts and rcN.d links support");
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#endif
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}
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return 0;
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}
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void lookup_paths_free(LookupPaths *p) {
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assert(p);
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strv_free(p->unit_path);
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p->unit_path = NULL;
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#ifdef HAVE_SYSV_COMPAT
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strv_free(p->sysvinit_path);
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strv_free(p->sysvrcnd_path);
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p->sysvinit_path = p->sysvrcnd_path = NULL;
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#endif
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}
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