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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "cgroup-util.h"
#include "format-util.h"
#include "macro.h"
#include "sd-path.h"
#include "specifier.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#include "unit-printf.h"
#include "unit.h"
#include "user-util.h"
static int specifier_prefix_and_instance(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
return unit_name_to_prefix_and_instance(u->id, ret);
}
static int specifier_prefix(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
return unit_name_to_prefix(u->id, ret);
}
static int specifier_prefix_unescaped(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
_cleanup_free_ char *p = NULL;
const Unit *u = ASSERT_PTR(userdata);
int r;
r = unit_name_to_prefix(u->id, &p);
if (r < 0)
return r;
return unit_name_unescape(p, ret);
}
static int specifier_instance_unescaped(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
return unit_name_unescape(strempty(u->instance), ret);
}
static int specifier_last_component(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
_cleanup_free_ char *prefix = NULL;
char *dash;
int r;
r = unit_name_to_prefix(u->id, &prefix);
if (r < 0)
return r;
dash = strrchr(prefix, '-');
if (dash)
return specifier_string(specifier, dash + 1, root, userdata, ret);
*ret = TAKE_PTR(prefix);
return 0;
}
static int specifier_last_component_unescaped(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
_cleanup_free_ char *p = NULL;
int r;
r = specifier_last_component(specifier, data, root, userdata, &p);
if (r < 0)
return r;
return unit_name_unescape(p, ret);
}
static int specifier_filename(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
if (u->instance)
return unit_name_path_unescape(u->instance, ret);
else
return unit_name_to_path(u->id, ret);
}
static void bad_specifier(const Unit *u, char specifier) {
log_unit_warning(u, "Specifier '%%%c' used in unit configuration, which is deprecated. Please update your unit file, as it does not work as intended.", specifier);
}
static int specifier_cgroup(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
CGroupRuntime *crt = unit_get_cgroup_runtime(u);
bad_specifier(u, specifier);
if (crt && crt->cgroup_path)
return strdup_to(ret, crt->cgroup_path);
return unit_default_cgroup_path(u, ret);
}
static int specifier_cgroup_root(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
bad_specifier(u, specifier);
return strdup_to(ret, u->manager->cgroup_root);
}
static int specifier_cgroup_slice(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata), *slice;
bad_specifier(u, specifier);
slice = UNIT_GET_SLICE(u);
if (slice) {
CGroupRuntime *crt = unit_get_cgroup_runtime(slice);
if (crt && crt->cgroup_path)
return strdup_to(ret, crt->cgroup_path);
return unit_default_cgroup_path(slice, ret);
}
return strdup_to(ret, u->manager->cgroup_root);
}
static int specifier_special_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
return strdup_to(ret, u->manager->prefix[PTR_TO_UINT(data)]);
}
static int specifier_credentials_dir(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
char *d;
assert(ret);
d = strjoin(u->manager->prefix[EXEC_DIRECTORY_RUNTIME], "/credentials/", u->id);
if (!d)
return -ENOMEM;
*ret = d;
return 0;
}
static int specifier_shared_data_dir(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
const Unit *u = ASSERT_PTR(userdata);
assert(ret);
return sd_path_lookup(MANAGER_IS_SYSTEM(u->manager) ? SD_PATH_SYSTEM_SHARED : SD_PATH_USER_SHARED, NULL, ret);
}
int unit_name_printf(const Unit *u, const char* format, char **ret) {
/*
* This will use the passed string as format string and replace the following specifiers (which should all be
* safe for inclusion in unit names):
*
* %n: the full id of the unit (foo-aaa@bar.waldo)
* %N: the id of the unit without the suffix (foo-aaa@bar)
* %p: the prefix (foo-aaa)
* %i: the instance (bar)
* %j: the last component of the prefix (aaa)
*/
const Specifier table[] = {
{ 'i', specifier_string, u->instance },
{ 'j', specifier_last_component, NULL },
{ 'n', specifier_string, u->id },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
COMMON_SYSTEM_SPECIFIERS,
COMMON_CREDS_SPECIFIERS(u->manager->runtime_scope),
{}
};
assert(u);
assert(format);
assert(ret);
return specifier_printf(format, UNIT_NAME_MAX, table, NULL, u, ret);
}
int unit_full_printf_full(const Unit *u, const char *format, size_t max_length, char **ret) {
/* This is similar to unit_name_printf() but also supports unescaping. Also, adds a couple of
* additional codes (which are likely not suitable for unescaped inclusion in unit names):
*
* %f: the unescaped instance if set, otherwise the id unescaped as path
*
* %c: cgroup path of unit (deprecated)
* %r: where units in this slice are placed in the cgroup tree (deprecated)
* %R: the root of this systemd's instance tree (deprecated)
*
* %C: the cache directory root (e.g. /var/cache or $XDG_CACHE_HOME)
* %d: the credentials directory ($CREDENTIALS_DIRECTORY)
* %D: the shared data root (e.g. /usr/share or $XDG_DATA_HOME)
* %E: the configuration directory root (e.g. /etc or $XDG_CONFIG_HOME)
* %L: the log directory root (e.g. /var/log or $XDG_STATE_HOME/log)
* %S: the state directory root (e.g. /var/lib or $XDG_STATE_HOME)
* %t: the runtime directory root (e.g. /run or $XDG_RUNTIME_DIR)
*
* %h: the homedir of the running user
* %s: the shell of the running user
*
* NOTICE: When you add new entries here, please be careful: specifiers which depend on settings of
* the unit file itself are broken by design, as they would resolve differently depending on whether
* they are used before or after the relevant configuration setting. Hence: don't add them.
*/
assert(u);
assert(format);
assert(ret);
const Specifier table[] = {
{ 'i', specifier_string, u->instance },
{ 'I', specifier_instance_unescaped, NULL },
{ 'j', specifier_last_component, NULL },
{ 'J', specifier_last_component_unescaped, NULL },
{ 'n', specifier_string, u->id },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
{ 'P', specifier_prefix_unescaped, NULL },
{ 'f', specifier_filename, NULL },
{ 'y', specifier_real_path, u->fragment_path },
{ 'Y', specifier_real_directory, u->fragment_path },
{ 'c', specifier_cgroup, NULL }, /* deprecated, see 1b89b0c499cd4bf0ff389caab4ecaae6e75f9d4e */
{ 'r', specifier_cgroup_slice, NULL }, /* deprecated, see 1b89b0c499cd4bf0ff389caab4ecaae6e75f9d4e */
{ 'R', specifier_cgroup_root, NULL }, /* deprecated, see 1b89b0c499cd4bf0ff389caab4ecaae6e75f9d4e */
{ 'C', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_CACHE) },
{ 'd', specifier_credentials_dir, NULL },
{ 'D', specifier_shared_data_dir, NULL },
{ 'E', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_CONFIGURATION) },
{ 'L', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_LOGS) },
{ 'S', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_STATE) },
{ 't', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_RUNTIME) },
{ 'h', specifier_user_home, NULL },
{ 's', specifier_user_shell, NULL },
COMMON_SYSTEM_SPECIFIERS,
COMMON_CREDS_SPECIFIERS(u->manager->runtime_scope),
COMMON_TMP_SPECIFIERS,
{}
};
return specifier_printf(format, max_length, table, NULL, u, ret);
}
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