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systemd/src/path-lookup.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include "util.h"
#include "strv.h"
#include "path-lookup.h"
int user_config_home(char **config_home) {
const char *e;
if ((e = getenv("XDG_CONFIG_HOME"))) {
if (asprintf(config_home, "%s/systemd/user", e) < 0)
return -ENOMEM;
return 1;
} else {
const char *home;
if ((home = getenv("HOME"))) {
if (asprintf(config_home, "%s/.config/systemd/user", home) < 0)
return -ENOMEM;
return 1;
}
}
return 0;
}
static char** user_dirs(void) {
const char * const config_unit_paths[] = {
"/run/systemd/user",
USER_CONFIG_UNIT_PATH,
"/etc/systemd/user",
NULL
};
const char * const data_unit_paths[] = {
"/usr/local/lib/systemd/user",
"/usr/local/share/systemd/user",
USER_DATA_UNIT_PATH,
"/usr/lib/systemd/user",
"/usr/share/systemd/user",
NULL
};
const char *home, *e;
char *config_home = NULL, *data_home = NULL;
char **config_dirs = NULL, **data_dirs = NULL;
char **r = NULL, **t;
/* Implement the mechanisms defined in
*
* http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
*
* We look in both the config and the data dirs because we
* want to encourage that distributors ship their unit files
* as data, and allow overriding as configuration.
*/
if (user_config_home(&config_home) < 0)
goto fail;
home = getenv("HOME");
if ((e = getenv("XDG_CONFIG_DIRS")))
if (!(config_dirs = strv_split(e, ":")))
goto fail;
/* We don't treat /etc/xdg/systemd here as the spec
* suggests because we assume that that is a link to
* /etc/systemd/ anyway. */
if ((e = getenv("XDG_DATA_HOME"))) {
if (asprintf(&data_home, "%s/systemd/user", e) < 0)
goto fail;
} else if (home) {
if (asprintf(&data_home, "%s/.local/share/systemd/user", home) < 0)
goto fail;
/* There is really no need for two unit dirs in $HOME,
* except to be fully compliant with the XDG spec. We
* now try to link the two dirs, so that we can
* minimize disk seeks a little. Further down we'll
* then filter out this link, if it is actually is
* one. */
mkdir_parents(data_home, 0777);
(void) symlink("../../../.config/systemd/user", data_home);
}
if ((e = getenv("XDG_DATA_DIRS")))
data_dirs = strv_split(e, ":");
else
data_dirs = strv_new("/usr/local/share",
"/usr/share",
NULL);
if (!data_dirs)
goto fail;
/* Now merge everything we found. */
if (config_home) {
if (!(t = strv_append(r, config_home)))
goto fail;
strv_free(r);
r = t;
}
if (!strv_isempty(config_dirs)) {
if (!(t = strv_merge_concat(r, config_dirs, "/systemd/user")))
goto finish;
strv_free(r);
r = t;
}
if (!(t = strv_merge(r, (char**) config_unit_paths)))
goto fail;
strv_free(r);
r = t;
if (data_home) {
if (!(t = strv_append(r, data_home)))
goto fail;
strv_free(r);
r = t;
}
if (!strv_isempty(data_dirs)) {
if (!(t = strv_merge_concat(r, data_dirs, "/systemd/user")))
goto fail;
strv_free(r);
r = t;
}
if (!(t = strv_merge(r, (char**) data_unit_paths)))
goto fail;
strv_free(r);
r = t;
if (!strv_path_make_absolute_cwd(r))
goto fail;
finish:
free(config_home);
strv_free(config_dirs);
free(data_home);
strv_free(data_dirs);
return r;
fail:
strv_free(r);
r = NULL;
goto finish;
}
int lookup_paths_init(LookupPaths *p, ManagerRunningAs running_as, bool personal) {
const char *e;
char *t;
assert(p);
/* First priority is whatever has been passed to us via env
* vars */
if ((e = getenv("SYSTEMD_UNIT_PATH")))
if (!(p->unit_path = split_path_and_make_absolute(e)))
return -ENOMEM;
if (strv_isempty(p->unit_path)) {
/* Nothing is set, so let's figure something out. */
strv_free(p->unit_path);
if (running_as == MANAGER_USER) {
if (personal)
p->unit_path = user_dirs();
else
p->unit_path = strv_new(
/* If you modify this you also want to modify
* systemduserunitpath= in systemd.pc.in, and
* the arrays in user_dirs() above! */
"/run/systemd/user",
USER_CONFIG_UNIT_PATH,
"/etc/systemd/user",
"/usr/local/lib/systemd/user",
"/usr/local/share/systemd/user",
USER_DATA_UNIT_PATH,
"/usr/lib/systemd/user",
"/usr/share/systemd/user",
NULL);
if (!p->unit_path)
return -ENOMEM;
} else
if (!(p->unit_path = strv_new(
/* If you modify this you also want to modify
* systemdsystemunitpath= in systemd.pc.in! */
"/run/systemd/system",
SYSTEM_CONFIG_UNIT_PATH,
"/etc/systemd/system",
"/usr/local/lib/systemd/system",
"/usr/lib/systemd/system",
SYSTEM_DATA_UNIT_PATH,
"/lib/systemd/system",
NULL)))
return -ENOMEM;
}
if (p->unit_path)
if (!strv_path_canonicalize(p->unit_path))
return -ENOMEM;
strv_uniq(p->unit_path);
strv_path_remove_empty(p->unit_path);
if (!strv_isempty(p->unit_path)) {
if (!(t = strv_join(p->unit_path, "\n\t")))
return -ENOMEM;
log_debug("Looking for unit files in:\n\t%s", t);
free(t);
} else {
log_debug("Ignoring unit files.");
strv_free(p->unit_path);
p->unit_path = NULL;
}
if (running_as == MANAGER_SYSTEM) {
#ifdef HAVE_SYSV_COMPAT
/* /etc/init.d/ compatibility does not matter to users */
if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
if (!(p->sysvinit_path = split_path_and_make_absolute(e)))
return -ENOMEM;
if (strv_isempty(p->sysvinit_path)) {
strv_free(p->sysvinit_path);
if (!(p->sysvinit_path = strv_new(
SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
NULL)))
return -ENOMEM;
}
if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
if (!(p->sysvrcnd_path = split_path_and_make_absolute(e)))
return -ENOMEM;
if (strv_isempty(p->sysvrcnd_path)) {
strv_free(p->sysvrcnd_path);
if (!(p->sysvrcnd_path = strv_new(
SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
NULL)))
return -ENOMEM;
}
if (p->sysvinit_path)
if (!strv_path_canonicalize(p->sysvinit_path))
return -ENOMEM;
if (p->sysvrcnd_path)
if (!strv_path_canonicalize(p->sysvrcnd_path))
return -ENOMEM;
strv_uniq(p->sysvinit_path);
strv_uniq(p->sysvrcnd_path);
strv_path_remove_empty(p->sysvinit_path);
strv_path_remove_empty(p->sysvrcnd_path);
if (!strv_isempty(p->sysvinit_path)) {
if (!(t = strv_join(p->sysvinit_path, "\n\t")))
return -ENOMEM;
log_debug("Looking for SysV init scripts in:\n\t%s", t);
free(t);
} else {
log_debug("Ignoring SysV init scripts.");
strv_free(p->sysvinit_path);
p->sysvinit_path = NULL;
}
if (!strv_isempty(p->sysvrcnd_path)) {
if (!(t = strv_join(p->sysvrcnd_path, "\n\t")))
return -ENOMEM;
log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
free(t);
} else {
log_debug("Ignoring SysV rcN.d links.");
strv_free(p->sysvrcnd_path);
p->sysvrcnd_path = NULL;
}
#else
log_debug("Disabled SysV init scripts and rcN.d links support");
#endif
}
return 0;
}
void lookup_paths_free(LookupPaths *p) {
assert(p);
strv_free(p->unit_path);
p->unit_path = NULL;
#ifdef HAVE_SYSV_COMPAT
strv_free(p->sysvinit_path);
strv_free(p->sysvrcnd_path);
p->sysvinit_path = p->sysvrcnd_path = NULL;
#endif
}
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