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Systemd/src/core/unit-printf.c

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/***
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 "alloc-util.h"
#include "cgroup-util.h"
#include "format-util.h"
#include "macro.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, void *data, void *userdata, char **ret) {
Unit *u = userdata;
assert(u);
return unit_name_to_prefix_and_instance(u->id, ret);
}
static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
Unit *u = userdata;
assert(u);
return unit_name_to_prefix(u->id, ret);
}
static int specifier_prefix_unescaped(char specifier, void *data, void *userdata, char **ret) {
_cleanup_free_ char *p = NULL;
Unit *u = userdata;
int r;
assert(u);
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, void *data, void *userdata, char **ret) {
Unit *u = userdata;
assert(u);
return unit_name_unescape(strempty(u->instance), ret);
}
static int specifier_filename(char specifier, void *data, void *userdata, char **ret) {
Unit *u = userdata;
assert(u);
if (u->instance)
return unit_name_path_unescape(u->instance, ret);
else
return unit_name_to_path(u->id, ret);
}
static void bad_specifier(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, void *data, void *userdata, char **ret) {
Unit *u = userdata;
char *n;
assert(u);
bad_specifier(u, specifier);
if (u->cgroup_path)
n = strdup(u->cgroup_path);
else
n = unit_default_cgroup_path(u);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
static int specifier_cgroup_root(char specifier, void *data, void *userdata, char **ret) {
Unit *u = userdata;
char *n;
assert(u);
bad_specifier(u, specifier);
n = strdup(u->manager->cgroup_root);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
static int specifier_cgroup_slice(char specifier, void *data, void *userdata, char **ret) {
Unit *u = userdata;
char *n;
assert(u);
bad_specifier(u, specifier);
if (UNIT_ISSET(u->slice)) {
Unit *slice;
slice = UNIT_DEREF(u->slice);
if (slice->cgroup_path)
n = strdup(slice->cgroup_path);
else
n = unit_default_cgroup_path(slice);
} else
n = strdup(u->manager->cgroup_root);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
static int specifier_runtime(char specifier, void *data, void *userdata, char **ret) {
Unit *u = userdata;
const char *e;
char *n = NULL;
assert(u);
e = manager_get_runtime_prefix(u->manager);
if (!e)
return -EOPNOTSUPP;
n = strdup(e);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
static int specifier_user_name(char specifier, void *data, void *userdata, char **ret) {
char *t;
/* If we are UID 0 (root), this will not result in NSS,
* otherwise it might. This is good, as we want to be able to
* run this in PID 1, where our user ID is 0, but where NSS
* lookups are not allowed. */
t = getusername_malloc();
if (!t)
return -ENOMEM;
*ret = t;
return 0;
}
static int specifier_user_id(char specifier, void *data, void *userdata, char **ret) {
if (asprintf(ret, UID_FMT, getuid()) < 0)
return -ENOMEM;
return 0;
}
static int specifier_user_home(char specifier, void *data, void *userdata, char **ret) {
/* On PID 1 (which runs as root) this will not result in NSS,
* which is good. See above */
return get_home_dir(ret);
}
static int specifier_user_shell(char specifier, void *data, void *userdata, char **ret) {
/* On PID 1 (which runs as root) this will not result in NSS,
* which is good. See above */
return get_shell(ret);
}
int unit_name_printf(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@bar.waldo)
* %N: the id of the unit without the suffix (foo@bar)
* %p: the prefix (foo)
* %i: the instance (bar)
*
* %U: the UID of the running user
* %u: the username of the running user
*
* %m: the machine ID of the running system
* %H: the host name of the running system
* %b: the boot ID of the running system
*/
const Specifier table[] = {
{ 'n', specifier_string, u->id },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
{ 'i', specifier_string, u->instance },
{ 'U', specifier_user_id, NULL },
{ 'u', specifier_user_name, NULL },
{ 'm', specifier_machine_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'b', specifier_boot_id, NULL },
{}
};
assert(u);
assert(format);
assert(ret);
return specifier_printf(format, table, u, ret);
}
int unit_full_printf(Unit *u, const char *format, 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)
* %t: the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
*
* %h: the homedir of the running user
* %s: the shell of the running user
*
* %v: `uname -r` of the running system
*
* 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.
*/
const Specifier table[] = {
{ 'n', specifier_string, u->id },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
{ 'P', specifier_prefix_unescaped, NULL },
{ 'i', specifier_string, u->instance },
{ 'I', specifier_instance_unescaped, NULL },
{ 'f', specifier_filename, NULL },
{ 'c', specifier_cgroup, NULL },
{ 'r', specifier_cgroup_slice, NULL },
{ 'R', specifier_cgroup_root, NULL },
{ 't', specifier_runtime, NULL },
{ 'U', specifier_user_id, NULL },
{ 'u', specifier_user_name, NULL },
{ 'h', specifier_user_home, NULL },
{ 's', specifier_user_shell, NULL },
{ 'm', specifier_machine_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'b', specifier_boot_id, NULL },
{ 'v', specifier_kernel_release, NULL },
{}
};
assert(u);
assert(format);
assert(ret);
return specifier_printf(format, table, u, ret);
}
int unit_full_printf_strv(Unit *u, char **l, char ***ret) {
size_t n;
char **r, **i, **j;
int q;
/* Applies unit_full_printf to every entry in l */
assert(u);
n = strv_length(l);
r = new(char*, n+1);
if (!r)
return -ENOMEM;
for (i = l, j = r; *i; i++, j++) {
q = unit_full_printf(u, *i, j);
if (q < 0)
goto fail;
}
*j = NULL;
*ret = r;
return 0;
fail:
for (j--; j >= r; j--)
free(*j);
free(r);
return q;
}
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