mirror of
https://github.com/systemd/systemd.git
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289 lines
9.9 KiB
C
289 lines
9.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "alloc-util.h"
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#include "cgroup-util.h"
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#include "format-util.h"
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#include "macro.h"
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#include "specifier.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "unit-printf.h"
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#include "unit.h"
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#include "user-util.h"
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static int specifier_prefix_and_instance(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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assert(u);
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return unit_name_to_prefix_and_instance(u->id, ret);
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}
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static int specifier_prefix(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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assert(u);
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return unit_name_to_prefix(u->id, ret);
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}
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static int specifier_prefix_unescaped(char specifier, const void *data, const void *userdata, char **ret) {
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_cleanup_free_ char *p = NULL;
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const Unit *u = userdata;
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int r;
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assert(u);
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r = unit_name_to_prefix(u->id, &p);
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if (r < 0)
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return r;
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return unit_name_unescape(p, ret);
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}
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static int specifier_instance_unescaped(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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assert(u);
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return unit_name_unescape(strempty(u->instance), ret);
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}
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static int specifier_last_component(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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_cleanup_free_ char *prefix = NULL;
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char *dash;
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int r;
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assert(u);
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r = unit_name_to_prefix(u->id, &prefix);
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if (r < 0)
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return r;
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dash = strrchr(prefix, '-');
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if (dash)
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return specifier_string(specifier, dash + 1, userdata, ret);
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*ret = TAKE_PTR(prefix);
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return 0;
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}
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static int specifier_last_component_unescaped(char specifier, const void *data, const void *userdata, char **ret) {
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_cleanup_free_ char *p = NULL;
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int r;
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r = specifier_last_component(specifier, data, userdata, &p);
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if (r < 0)
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return r;
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return unit_name_unescape(p, ret);
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}
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static int specifier_filename(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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assert(u);
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if (u->instance)
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return unit_name_path_unescape(u->instance, ret);
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else
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return unit_name_to_path(u->id, ret);
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}
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static void bad_specifier(const Unit *u, char specifier) {
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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);
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}
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static int specifier_cgroup(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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char *n;
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assert(u);
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bad_specifier(u, specifier);
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if (u->cgroup_path)
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n = strdup(u->cgroup_path);
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else
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n = unit_default_cgroup_path(u);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_cgroup_root(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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char *n;
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assert(u);
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bad_specifier(u, specifier);
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n = strdup(u->manager->cgroup_root);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_cgroup_slice(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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char *n;
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assert(u);
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bad_specifier(u, specifier);
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if (UNIT_ISSET(u->slice)) {
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const Unit *slice;
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slice = UNIT_DEREF(u->slice);
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if (slice->cgroup_path)
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n = strdup(slice->cgroup_path);
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else
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n = unit_default_cgroup_path(slice);
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} else
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n = strdup(u->manager->cgroup_root);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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static int specifier_special_directory(char specifier, const void *data, const void *userdata, char **ret) {
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const Unit *u = userdata;
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char *n = NULL;
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assert(u);
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n = strdup(u->manager->prefix[PTR_TO_UINT(data)]);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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int unit_name_printf(const Unit *u, const char* format, char **ret) {
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/*
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* This will use the passed string as format string and replace the following specifiers (which should all be
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* safe for inclusion in unit names):
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*
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* %n: the full id of the unit (foo@bar.waldo)
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* %N: the id of the unit without the suffix (foo@bar)
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* %p: the prefix (foo)
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* %i: the instance (bar)
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*
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* %U: the UID of the running user
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* %u: the username of the running user
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*
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* %m: the machine ID of the running system
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* %H: the host name of the running system
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* %b: the boot ID of the running system
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*/
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const Specifier table[] = {
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{ 'n', specifier_string, u->id },
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{ 'N', specifier_prefix_and_instance, NULL },
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{ 'p', specifier_prefix, NULL },
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{ 'i', specifier_string, u->instance },
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{ 'j', specifier_last_component, NULL },
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{ 'g', specifier_group_name, NULL },
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{ 'G', specifier_group_id, NULL },
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{ 'U', specifier_user_id, NULL },
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{ 'u', specifier_user_name, NULL },
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{ 'm', specifier_machine_id, NULL },
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{ 'H', specifier_host_name, NULL },
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{ 'b', specifier_boot_id, NULL },
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{}
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};
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assert(u);
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assert(format);
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assert(ret);
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return specifier_printf(format, table, u, ret);
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}
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int unit_full_printf(const Unit *u, const char *format, char **ret) {
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/* This is similar to unit_name_printf() but also supports unescaping. Also, adds a couple of additional codes
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* (which are likely not suitable for unescaped inclusion in unit names):
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*
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* %f: the unescaped instance if set, otherwise the id unescaped as path
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*
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* %c: cgroup path of unit (deprecated)
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* %r: where units in this slice are placed in the cgroup tree (deprecated)
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* %R: the root of this systemd's instance tree (deprecated)
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*
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* %t: the runtime directory root (e.g. /run or $XDG_RUNTIME_DIR)
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* %S: the state directory root (e.g. /var/lib or $XDG_CONFIG_HOME)
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* %C: the cache directory root (e.g. /var/cache or $XDG_CACHE_HOME)
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* %L: the log directory root (e.g. /var/log or $XDG_CONFIG_HOME/log)
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* %E: the configuration directory root (e.g. /etc or $XDG_CONFIG_HOME)
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* %T: the temporary directory (e.g. /tmp, or $TMPDIR, $TEMP, $TMP)
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* %V: the temporary directory for large, persistent stuff (e.g. /var/tmp, or $TMPDIR, $TEMP, $TMP)
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*
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* %h: the homedir of the running user
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* %s: the shell of the running user
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*
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* %v: `uname -r` of the running system
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*
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* NOTICE: When you add new entries here, please be careful: specifiers which depend on settings of the unit
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* file itself are broken by design, as they would resolve differently depending on whether they are used
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* before or after the relevant configuration setting. Hence: don't add them.
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*/
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assert(u);
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assert(format);
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assert(ret);
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const Specifier table[] = {
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{ 'n', specifier_string, u->id },
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{ 'N', specifier_prefix_and_instance, NULL },
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{ 'p', specifier_prefix, NULL },
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{ 'P', specifier_prefix_unescaped, NULL },
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{ 'i', specifier_string, u->instance },
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{ 'I', specifier_instance_unescaped, NULL },
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{ 'j', specifier_last_component, NULL },
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{ 'J', specifier_last_component_unescaped, NULL },
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{ 'f', specifier_filename, NULL },
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{ 'c', specifier_cgroup, NULL },
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{ 'r', specifier_cgroup_slice, NULL },
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{ 'R', specifier_cgroup_root, NULL },
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{ 't', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_RUNTIME) },
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{ 'S', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_STATE) },
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{ 'C', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_CACHE) },
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{ 'L', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_LOGS) },
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{ 'E', specifier_special_directory, UINT_TO_PTR(EXEC_DIRECTORY_CONFIGURATION) },
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{ 'T', specifier_tmp_dir, NULL },
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{ 'V', specifier_var_tmp_dir, NULL },
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{ 'g', specifier_group_name, NULL },
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{ 'G', specifier_group_id, NULL },
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{ 'U', specifier_user_id, NULL },
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{ 'u', specifier_user_name, NULL },
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{ 'h', specifier_user_home, NULL },
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{ 's', specifier_user_shell, NULL },
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{ 'm', specifier_machine_id, NULL },
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{ 'H', specifier_host_name, NULL },
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{ 'b', specifier_boot_id, NULL },
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{ 'v', specifier_kernel_release, NULL },
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{}
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};
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return specifier_printf(format, table, u, ret);
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}
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