blob: 6bf0ff0316a98d4f7b92c4418ecdd195b263b8c0 [file] [log] [blame] [raw]
/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "alloc-util.h"
#include "fs-util.h"
#include "install.h"
#include "log.h"
#include "macro.h"
#include "mkdir.h"
#include "path-lookup.h"
#include "path-util.h"
#include "rm-rf.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "tmpfile-util.h"
#include "user-util.h"
#include "util.h"
int xdg_user_runtime_dir(char **ret, const char *suffix) {
const char *e;
char *j;
assert(ret);
assert(suffix);
e = getenv("XDG_RUNTIME_DIR");
if (!e)
return -ENXIO;
j = strjoin(e, suffix);
if (!j)
return -ENOMEM;
*ret = j;
return 0;
}
int xdg_user_config_dir(char **ret, const char *suffix) {
const char *e;
char *j;
int r;
assert(ret);
e = getenv("XDG_CONFIG_HOME");
if (e)
j = strjoin(e, suffix);
else {
_cleanup_free_ char *home = NULL;
r = get_home_dir(&home);
if (r < 0)
return r;
j = strjoin(home, "/.config", suffix);
}
if (!j)
return -ENOMEM;
*ret = j;
return 0;
}
int xdg_user_data_dir(char **ret, const char *suffix) {
const char *e;
char *j;
int r;
assert(ret);
assert(suffix);
/* We don't treat /etc/xdg/systemd here as the spec
* suggests because we assume that is a link to
* /etc/systemd/ anyway. */
e = getenv("XDG_DATA_HOME");
if (e)
j = strjoin(e, suffix);
else {
_cleanup_free_ char *home = NULL;
r = get_home_dir(&home);
if (r < 0)
return r;
j = strjoin(home, "/.local/share", suffix);
}
if (!j)
return -ENOMEM;
*ret = j;
return 1;
}
static const char* const user_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
};
static const char* const user_config_unit_paths[] = {
USER_CONFIG_UNIT_PATH,
"/etc/systemd/user",
NULL
};
int xdg_user_dirs(char ***ret_config_dirs, char ***ret_data_dirs) {
/* 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.
*/
const char *e;
_cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
e = getenv("XDG_CONFIG_DIRS");
if (e) {
config_dirs = strv_split(e, ":");
if (!config_dirs)
return -ENOMEM;
}
e = getenv("XDG_DATA_DIRS");
if (e)
data_dirs = strv_split(e, ":");
else
data_dirs = strv_new("/usr/local/share",
"/usr/share");
if (!data_dirs)
return -ENOMEM;
*ret_config_dirs = TAKE_PTR(config_dirs);
*ret_data_dirs = TAKE_PTR(data_dirs);
return 0;
}
static char** user_dirs(
const char *persistent_config,
const char *runtime_config,
const char *global_persistent_config,
const char *global_runtime_config,
const char *generator,
const char *generator_early,
const char *generator_late,
const char *transient,
const char *persistent_control,
const char *runtime_control) {
_cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
_cleanup_free_ char *data_home = NULL;
_cleanup_strv_free_ char **res = NULL;
int r;
r = xdg_user_dirs(&config_dirs, &data_dirs);
if (r < 0)
return NULL;
r = xdg_user_data_dir(&data_home, "/systemd/user");
if (r < 0 && r != -ENXIO)
return NULL;
/* Now merge everything we found. */
if (strv_extend(&res, persistent_control) < 0)
return NULL;
if (strv_extend(&res, runtime_control) < 0)
return NULL;
if (strv_extend(&res, transient) < 0)
return NULL;
if (strv_extend(&res, generator_early) < 0)
return NULL;
if (strv_extend_strv_concat(&res, config_dirs, "/systemd/user") < 0)
return NULL;
if (strv_extend(&res, persistent_config) < 0)
return NULL;
/* global config has lower priority than the user config of the same type */
if (strv_extend(&res, global_persistent_config) < 0)
return NULL;
if (strv_extend_strv(&res, (char**) user_config_unit_paths, false) < 0)
return NULL;
if (strv_extend(&res, runtime_config) < 0)
return NULL;
if (strv_extend(&res, global_runtime_config) < 0)
return NULL;
if (strv_extend(&res, generator) < 0)
return NULL;
if (strv_extend(&res, data_home) < 0)
return NULL;
if (strv_extend_strv_concat(&res, data_dirs, "/systemd/user") < 0)
return NULL;
if (strv_extend_strv(&res, (char**) user_data_unit_paths, false) < 0)
return NULL;
if (strv_extend(&res, generator_late) < 0)
return NULL;
if (path_strv_make_absolute_cwd(res) < 0)
return NULL;
return TAKE_PTR(res);
}
bool path_is_user_data_dir(const char *path) {
assert(path);
return strv_contains((char**) user_data_unit_paths, path);
}
bool path_is_user_config_dir(const char *path) {
assert(path);
return strv_contains((char**) user_config_unit_paths, path);
}
static int acquire_generator_dirs(
UnitFileScope scope,
const char *tempdir,
char **generator,
char **generator_early,
char **generator_late) {
_cleanup_free_ char *x = NULL, *y = NULL, *z = NULL;
const char *prefix;
assert(generator);
assert(generator_early);
assert(generator_late);
assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER, UNIT_FILE_GLOBAL));
if (scope == UNIT_FILE_GLOBAL)
return -EOPNOTSUPP;
if (tempdir)
prefix = tempdir;
else if (scope == UNIT_FILE_SYSTEM)
prefix = "/run/systemd";
else {
/* UNIT_FILE_USER */
const char *e;
e = getenv("XDG_RUNTIME_DIR");
if (!e)
return -ENXIO;
prefix = strjoina(e, "/systemd");
}
x = path_join(prefix, "generator");
if (!x)
return -ENOMEM;
y = path_join(prefix, "generator.early");
if (!y)
return -ENOMEM;
z = path_join(prefix, "generator.late");
if (!z)
return -ENOMEM;
*generator = TAKE_PTR(x);
*generator_early = TAKE_PTR(y);
*generator_late = TAKE_PTR(z);
return 0;
}
static int acquire_transient_dir(
UnitFileScope scope,
const char *tempdir,
char **ret) {
char *transient;
assert(ret);
assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER, UNIT_FILE_GLOBAL));
if (scope == UNIT_FILE_GLOBAL)
return -EOPNOTSUPP;
if (tempdir)
transient = path_join(tempdir, "transient");
else if (scope == UNIT_FILE_SYSTEM)
transient = strdup("/run/systemd/transient");
else
return xdg_user_runtime_dir(ret, "/systemd/transient");
if (!transient)
return -ENOMEM;
*ret = transient;
return 0;
}
static int acquire_config_dirs(UnitFileScope scope, char **persistent, char **runtime) {
_cleanup_free_ char *a = NULL, *b = NULL;
int r;
assert(persistent);
assert(runtime);
switch (scope) {
case UNIT_FILE_SYSTEM:
a = strdup(SYSTEM_CONFIG_UNIT_PATH);
b = strdup("/run/systemd/system");
break;
case UNIT_FILE_GLOBAL:
a = strdup(USER_CONFIG_UNIT_PATH);
b = strdup("/run/systemd/user");
break;
case UNIT_FILE_USER:
r = xdg_user_config_dir(&a, "/systemd/user");
if (r < 0 && r != -ENXIO)
return r;
r = xdg_user_runtime_dir(runtime, "/systemd/user");
if (r < 0) {
if (r != -ENXIO)
return r;
/* If XDG_RUNTIME_DIR is not set, don't consider that fatal, simply initialize the runtime
* directory to NULL */
*runtime = NULL;
}
*persistent = TAKE_PTR(a);
return 0;
default:
assert_not_reached("Hmm, unexpected scope value.");
}
if (!a || !b)
return -ENOMEM;
*persistent = TAKE_PTR(a);
*runtime = TAKE_PTR(b);
return 0;
}
static int acquire_control_dirs(UnitFileScope scope, char **persistent, char **runtime) {
_cleanup_free_ char *a = NULL;
int r;
assert(persistent);
assert(runtime);
switch (scope) {
case UNIT_FILE_SYSTEM: {
_cleanup_free_ char *b = NULL;
a = strdup("/etc/systemd/system.control");
if (!a)
return -ENOMEM;
b = strdup("/run/systemd/system.control");
if (!b)
return -ENOMEM;
*runtime = TAKE_PTR(b);
break;
}
case UNIT_FILE_USER:
r = xdg_user_config_dir(&a, "/systemd/user.control");
if (r < 0 && r != -ENXIO)
return r;
r = xdg_user_runtime_dir(runtime, "/systemd/user.control");
if (r < 0) {
if (r != -ENXIO)
return r;
/* If XDG_RUNTIME_DIR is not set, don't consider this fatal, simply initialize the directory to
* NULL */
*runtime = NULL;
}
break;
case UNIT_FILE_GLOBAL:
return -EOPNOTSUPP;
default:
assert_not_reached("Hmm, unexpected scope value.");
}
*persistent = TAKE_PTR(a);
return 0;
}
static int acquire_attached_dirs(
UnitFileScope scope,
char **ret_persistent,
char **ret_runtime) {
_cleanup_free_ char *a = NULL, *b = NULL;
assert(ret_persistent);
assert(ret_runtime);
/* Portable services are not available to regular users for now. */
if (scope != UNIT_FILE_SYSTEM)
return -EOPNOTSUPP;
a = strdup("/etc/systemd/system.attached");
if (!a)
return -ENOMEM;
b = strdup("/run/systemd/system.attached");
if (!b)
return -ENOMEM;
*ret_persistent = TAKE_PTR(a);
*ret_runtime = TAKE_PTR(b);
return 0;
}
static int patch_root_prefix(char **p, const char *root_dir) {
char *c;
assert(p);
if (!*p)
return 0;
c = path_join(root_dir, *p);
if (!c)
return -ENOMEM;
free_and_replace(*p, c);
return 0;
}
static int patch_root_prefix_strv(char **l, const char *root_dir) {
char **i;
int r;
if (!root_dir)
return 0;
STRV_FOREACH(i, l) {
r = patch_root_prefix(i, root_dir);
if (r < 0)
return r;
}
return 0;
}
int lookup_paths_init(
LookupPaths *p,
UnitFileScope scope,
LookupPathsFlags flags,
const char *root_dir) {
_cleanup_(rmdir_and_freep) char *tempdir = NULL;
_cleanup_free_ char
*root = NULL,
*persistent_config = NULL, *runtime_config = NULL,
*global_persistent_config = NULL, *global_runtime_config = NULL,
*generator = NULL, *generator_early = NULL, *generator_late = NULL,
*transient = NULL,
*persistent_control = NULL, *runtime_control = NULL,
*persistent_attached = NULL, *runtime_attached = NULL;
bool append = false; /* Add items from SYSTEMD_UNIT_PATH before normal directories */
_cleanup_strv_free_ char **paths = NULL;
const char *e;
int r;
assert(p);
assert(scope >= 0);
assert(scope < _UNIT_FILE_SCOPE_MAX);
#if HAVE_SPLIT_USR
flags |= LOOKUP_PATHS_SPLIT_USR;
#endif
if (!empty_or_root(root_dir)) {
if (scope == UNIT_FILE_USER)
return -EINVAL;
r = is_dir(root_dir, true);
if (r < 0)
return r;
if (r == 0)
return -ENOTDIR;
root = strdup(root_dir);
if (!root)
return -ENOMEM;
}
if (flags & LOOKUP_PATHS_TEMPORARY_GENERATED) {
r = mkdtemp_malloc("/tmp/systemd-temporary-XXXXXX", &tempdir);
if (r < 0)
return log_debug_errno(r, "Failed to create temporary directory: %m");
}
/* Note: when XDG_RUNTIME_DIR is not set this will not return -ENXIO, but simply set runtime_config to NULL */
r = acquire_config_dirs(scope, &persistent_config, &runtime_config);
if (r < 0)
return r;
if (scope == UNIT_FILE_USER) {
r = acquire_config_dirs(UNIT_FILE_GLOBAL, &global_persistent_config, &global_runtime_config);
if (r < 0)
return r;
}
if ((flags & LOOKUP_PATHS_EXCLUDE_GENERATED) == 0) {
/* Note: if XDG_RUNTIME_DIR is not set, this will fail completely with ENXIO */
r = acquire_generator_dirs(scope, tempdir,
&generator, &generator_early, &generator_late);
if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENXIO))
return r;
}
/* Note: if XDG_RUNTIME_DIR is not set, this will fail completely with ENXIO */
r = acquire_transient_dir(scope, tempdir, &transient);
if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENXIO))
return r;
/* Note: when XDG_RUNTIME_DIR is not set this will not return -ENXIO, but simply set runtime_control to NULL */
r = acquire_control_dirs(scope, &persistent_control, &runtime_control);
if (r < 0 && r != -EOPNOTSUPP)
return r;
r = acquire_attached_dirs(scope, &persistent_attached, &runtime_attached);
if (r < 0 && r != -EOPNOTSUPP)
return r;
/* First priority is whatever has been passed to us via env vars */
e = getenv("SYSTEMD_UNIT_PATH");
if (e) {
const char *k;
k = endswith(e, ":");
if (k) {
e = strndupa(e, k - e);
append = true;
}
/* FIXME: empty components in other places should be rejected. */
r = path_split_and_make_absolute(e, &paths);
if (r < 0)
return r;
}
if (!paths || append) {
/* Let's figure something out. */
_cleanup_strv_free_ char **add = NULL;
/* 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. */
switch (scope) {
case UNIT_FILE_SYSTEM:
add = strv_new(
/* If you modify this you also want to modify
* systemdsystemunitpath= in systemd.pc.in! */
STRV_IFNOTNULL(persistent_control),
STRV_IFNOTNULL(runtime_control),
STRV_IFNOTNULL(transient),
STRV_IFNOTNULL(generator_early),
persistent_config,
SYSTEM_CONFIG_UNIT_PATH,
"/etc/systemd/system",
STRV_IFNOTNULL(persistent_attached),
runtime_config,
"/run/systemd/system",
STRV_IFNOTNULL(runtime_attached),
STRV_IFNOTNULL(generator),
"/usr/local/lib/systemd/system",
SYSTEM_DATA_UNIT_PATH,
"/usr/lib/systemd/system",
STRV_IFNOTNULL(flags & LOOKUP_PATHS_SPLIT_USR ? "/lib/systemd/system" : NULL),
STRV_IFNOTNULL(generator_late));
break;
case UNIT_FILE_GLOBAL:
add = 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(persistent_control),
STRV_IFNOTNULL(runtime_control),
STRV_IFNOTNULL(transient),
STRV_IFNOTNULL(generator_early),
persistent_config,
USER_CONFIG_UNIT_PATH,
"/etc/systemd/user",
runtime_config,
"/run/systemd/user",
STRV_IFNOTNULL(generator),
"/usr/local/share/systemd/user",
"/usr/share/systemd/user",
"/usr/local/lib/systemd/user",
USER_DATA_UNIT_PATH,
"/usr/lib/systemd/user",
STRV_IFNOTNULL(generator_late));
break;
case UNIT_FILE_USER:
add = user_dirs(persistent_config, runtime_config,
global_persistent_config, global_runtime_config,
generator, generator_early, generator_late,
transient,
persistent_control, runtime_control);
break;
default:
assert_not_reached("Hmm, unexpected scope?");
}
if (!add)
return -ENOMEM;
if (paths) {
r = strv_extend_strv(&paths, add, true);
if (r < 0)
return r;
} else
/* Small optimization: if paths is NULL (and it usually is), we can simply assign 'add' to it,
* and don't have to copy anything */
paths = TAKE_PTR(add);
}
r = patch_root_prefix(&persistent_config, root);
if (r < 0)
return r;
r = patch_root_prefix(&runtime_config, root);
if (r < 0)
return r;
r = patch_root_prefix(&generator, root);
if (r < 0)
return r;
r = patch_root_prefix(&generator_early, root);
if (r < 0)
return r;
r = patch_root_prefix(&generator_late, root);
if (r < 0)
return r;
r = patch_root_prefix(&transient, root);
if (r < 0)
return r;
r = patch_root_prefix(&persistent_control, root);
if (r < 0)
return r;
r = patch_root_prefix(&runtime_control, root);
if (r < 0)
return r;
r = patch_root_prefix(&persistent_attached, root);
if (r < 0)
return r;
r = patch_root_prefix(&runtime_attached, root);
if (r < 0)
return r;
r = patch_root_prefix_strv(paths, root);
if (r < 0)
return -ENOMEM;
*p = (LookupPaths) {
.search_path = strv_uniq(TAKE_PTR(paths)),
.persistent_config = TAKE_PTR(persistent_config),
.runtime_config = TAKE_PTR(runtime_config),
.generator = TAKE_PTR(generator),
.generator_early = TAKE_PTR(generator_early),
.generator_late = TAKE_PTR(generator_late),
.transient = TAKE_PTR(transient),
.persistent_control = TAKE_PTR(persistent_control),
.runtime_control = TAKE_PTR(runtime_control),
.persistent_attached = TAKE_PTR(persistent_attached),
.runtime_attached = TAKE_PTR(runtime_attached),
.root_dir = TAKE_PTR(root),
.temporary_dir = TAKE_PTR(tempdir),
};
return 0;
}
void lookup_paths_free(LookupPaths *p) {
if (!p)
return;
p->search_path = strv_free(p->search_path);
p->persistent_config = mfree(p->persistent_config);
p->runtime_config = mfree(p->runtime_config);
p->persistent_attached = mfree(p->persistent_attached);
p->runtime_attached = mfree(p->runtime_attached);
p->generator = mfree(p->generator);
p->generator_early = mfree(p->generator_early);
p->generator_late = mfree(p->generator_late);
p->transient = mfree(p->transient);
p->persistent_control = mfree(p->persistent_control);
p->runtime_control = mfree(p->runtime_control);
p->root_dir = mfree(p->root_dir);
p->temporary_dir = mfree(p->temporary_dir);
}
void lookup_paths_log(LookupPaths *p) {
assert(p);
if (strv_isempty(p->search_path)) {
log_debug("Ignoring unit files.");
p->search_path = strv_free(p->search_path);
} else {
_cleanup_free_ char *t;
t = strv_join(p->search_path, "\n\t");
log_debug("Looking for unit files in (higher priority first):\n\t%s", strna(t));
}
}
int lookup_paths_mkdir_generator(LookupPaths *p) {
int r, q;
assert(p);
if (!p->generator || !p->generator_early || !p->generator_late)
return -EINVAL;
r = mkdir_p_label(p->generator, 0755);
q = mkdir_p_label(p->generator_early, 0755);
if (q < 0 && r >= 0)
r = q;
q = mkdir_p_label(p->generator_late, 0755);
if (q < 0 && r >= 0)
r = q;
return r;
}
void lookup_paths_trim_generator(LookupPaths *p) {
assert(p);
/* Trim empty dirs */
if (p->generator)
(void) rmdir(p->generator);
if (p->generator_early)
(void) rmdir(p->generator_early);
if (p->generator_late)
(void) rmdir(p->generator_late);
}
void lookup_paths_flush_generator(LookupPaths *p) {
assert(p);
/* Flush the generated unit files in full */
if (p->generator)
(void) rm_rf(p->generator, REMOVE_ROOT|REMOVE_PHYSICAL);
if (p->generator_early)
(void) rm_rf(p->generator_early, REMOVE_ROOT|REMOVE_PHYSICAL);
if (p->generator_late)
(void) rm_rf(p->generator_late, REMOVE_ROOT|REMOVE_PHYSICAL);
if (p->temporary_dir)
(void) rm_rf(p->temporary_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
}
char **generator_binary_paths(UnitFileScope scope) {
switch (scope) {
case UNIT_FILE_SYSTEM:
return strv_new("/run/systemd/system-generators",
"/etc/systemd/system-generators",
"/usr/local/lib/systemd/system-generators",
SYSTEM_GENERATOR_PATH);
case UNIT_FILE_GLOBAL:
case UNIT_FILE_USER:
return strv_new("/run/systemd/user-generators",
"/etc/systemd/user-generators",
"/usr/local/lib/systemd/user-generators",
USER_GENERATOR_PATH);
default:
assert_not_reached("Hmm, unexpected scope.");
}
}