path-lookup.c revision cf7d80a5fe549d4db11800015e02220dccec3096
/*-*- 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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "util.h"
#include "mkdir.h"
#include "strv.h"
#include "path-util.h"
#include "path-lookup.h"
int user_config_home(char **config_home) {
const char *e;
char *r;
e = getenv("XDG_CONFIG_HOME");
if (e) {
r = strappend(e, "/systemd/user");
if (!r)
return -ENOMEM;
*config_home = r;
return 1;
} else {
const char *home;
home = getenv("HOME");
if (home) {
r = strappend(home, "/.config/systemd/user");
if (!r)
return -ENOMEM;
*config_home = r;
return 1;
}
}
return 0;
}
static char** user_dirs(
const char *generator,
const char *generator_early,
const char *generator_late) {
const char * const config_unit_paths[] = {
USER_CONFIG_UNIT_PATH,
"/etc/systemd/user",
"/run/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;
_cleanup_free_ char *config_home = NULL, *data_home = NULL;
_cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
char **r = NULL;
/* 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");
e = getenv("XDG_CONFIG_DIRS");
if (e) {
config_dirs = strv_split(e, ":");
if (!config_dirs)
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. */
e = getenv("XDG_DATA_HOME");
if (e) {
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;
}
e = getenv("XDG_DATA_DIRS");
if (e)
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 (generator_early)
if (strv_extend(&r, generator_early) < 0)
goto fail;
if (config_home)
if (strv_extend(&r, config_home) < 0)
goto fail;
if (!strv_isempty(config_dirs))
if (strv_extend_strv_concat(&r, config_dirs, "/systemd/user") < 0)
goto fail;
if (strv_extend_strv(&r, (char**) config_unit_paths) < 0)
goto fail;
if (generator)
if (strv_extend(&r, generator) < 0)
goto fail;
if (data_home)
if (strv_extend(&r, data_home) < 0)
goto fail;
if (!strv_isempty(data_dirs))
if (strv_extend_strv_concat(&r, data_dirs, "/systemd/user") < 0)
goto fail;
if (strv_extend_strv(&r, (char**) data_unit_paths) < 0)
goto fail;
if (generator_late)
if (strv_extend(&r, generator_late) < 0)
goto fail;
if (!path_strv_make_absolute_cwd(r))
goto fail;
return r;
fail:
strv_free(r);
return NULL;
}
int lookup_paths_init(
LookupPaths *p,
SystemdRunningAs running_as,
bool personal,
const char *root_dir,
const char *generator,
const char *generator_early,
const char *generator_late) {
const char *e;
bool append = false; /* Add items from SYSTEMD_UNIT_PATH before normal directories */
assert(p);
/* First priority is whatever has been passed to us via env
* vars */
e = getenv("SYSTEMD_UNIT_PATH");
if (e) {
if (endswith(e, ":")) {
e = strndupa(e, strlen(e) - 1);
append = true;
}
/* FIXME: empty components in other places should be
* rejected. */
p->unit_path = path_split_and_make_absolute(e);
if (!p->unit_path)
return -ENOMEM;
} else
p->unit_path = NULL;
if (!p->unit_path || append) {
/* Let's figure something out. */
char **unit_path;
int r;
/* For the user units we include share/ in the search
* path in order to comply with the XDG basedir spec.
* For the system stuff we avoid such nonsense. OTOH
* we include /lib in the search path for the system
* stuff but avoid it for user stuff. */
if (running_as == SYSTEMD_USER) {
if (personal)
unit_path = user_dirs(generator, generator_early, generator_late);
else
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! */
STRV_IFNOTNULL(generator_early),
USER_CONFIG_UNIT_PATH,
"/etc/systemd/user",
"/run/systemd/user",
STRV_IFNOTNULL(generator),
"/usr/local/lib/systemd/user",
"/usr/local/share/systemd/user",
USER_DATA_UNIT_PATH,
"/usr/lib/systemd/user",
"/usr/share/systemd/user",
STRV_IFNOTNULL(generator_late),
NULL);
} else
unit_path = strv_new(
/* If you modify this you also want to modify
* systemdsystemunitpath= in systemd.pc.in! */
STRV_IFNOTNULL(generator_early),
SYSTEM_CONFIG_UNIT_PATH,
"/etc/systemd/system",
"/run/systemd/system",
STRV_IFNOTNULL(generator),
"/usr/local/lib/systemd/system",
SYSTEM_DATA_UNIT_PATH,
"/usr/lib/systemd/system",
#ifdef HAVE_SPLIT_USR
"/lib/systemd/system",
#endif
STRV_IFNOTNULL(generator_late),
NULL);
if (!unit_path)
return -ENOMEM;
r = strv_extend_strv(&p->unit_path, unit_path);
if (r < 0)
return r;
}
if (!path_strv_resolve_uniq(p->unit_path, root_dir))
return -ENOMEM;
if (!strv_isempty(p->unit_path)) {
_cleanup_free_ char *t = strv_join(p->unit_path, "\n\t");
if (!t)
return -ENOMEM;
log_debug("Looking for unit files in (higher priority first):\n\t%s", t);
} else {
log_debug("Ignoring unit files.");
strv_free(p->unit_path);
p->unit_path = NULL;
}
if (running_as == SYSTEMD_SYSTEM) {
#ifdef HAVE_SYSV_COMPAT
/* /etc/init.d/ compatibility does not matter to users */
e = getenv("SYSTEMD_SYSVINIT_PATH");
if (e) {
p->sysvinit_path = path_split_and_make_absolute(e);
if (!p->sysvinit_path)
return -ENOMEM;
} else
p->sysvinit_path = NULL;
if (strv_isempty(p->sysvinit_path)) {
strv_free(p->sysvinit_path);
p->sysvinit_path = strv_new(
SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
NULL);
if (!p->sysvinit_path)
return -ENOMEM;
}
e = getenv("SYSTEMD_SYSVRCND_PATH");
if (e) {
p->sysvrcnd_path = path_split_and_make_absolute(e);
if (!p->sysvrcnd_path)
return -ENOMEM;
} else
p->sysvrcnd_path = NULL;
if (strv_isempty(p->sysvrcnd_path)) {
strv_free(p->sysvrcnd_path);
p->sysvrcnd_path = strv_new(
SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
NULL);
if (!p->sysvrcnd_path)
return -ENOMEM;
}
if (!path_strv_resolve_uniq(p->sysvinit_path, root_dir))
return -ENOMEM;
if (!path_strv_resolve_uniq(p->sysvrcnd_path, root_dir))
return -ENOMEM;
if (!strv_isempty(p->sysvinit_path)) {
_cleanup_free_ char *t = strv_join(p->sysvinit_path, "\n\t");
if (!t)
return -ENOMEM;
log_debug("Looking for SysV init scripts in:\n\t%s", t);
} else {
log_debug("Ignoring SysV init scripts.");
strv_free(p->sysvinit_path);
p->sysvinit_path = NULL;
}
if (!strv_isempty(p->sysvrcnd_path)) {
_cleanup_free_ char *t =
strv_join(p->sysvrcnd_path, "\n\t");
if (!t)
return -ENOMEM;
log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
} else {
log_debug("Ignoring SysV rcN.d links.");
strv_free(p->sysvrcnd_path);
p->sysvrcnd_path = NULL;
}
#else
log_debug("SysV init scripts and rcN.d links support disabled");
#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
}