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/***
This file is part of systemd.
Copyright 2013 Zbigniew Jędrzejewski-Szmek
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 <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "formats-util.h"
#include "install-printf.h"
#include "install.h"
#include "macro.h"
#include "specifier.h"
#include "string-util.h"
#include "unit-name.h"
#include "user-util.h"
static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) {
const UnitFileInstallInfo *i = userdata;
_cleanup_free_ char *prefix = NULL;
int r;
assert(i);
r = unit_name_to_prefix_and_instance(i->name, &prefix);
if (r < 0)
return r;
if (endswith(prefix, "@") && i->default_instance) {
char *ans;
ans = strjoin(prefix, i->default_instance, NULL);
if (!ans)
return -ENOMEM;
*ret = ans;
} else {
*ret = prefix;
prefix = NULL;
}
return 0;
}
static int specifier_name(char specifier, void *data, void *userdata, char **ret) {
const UnitFileInstallInfo *i = userdata;
char *ans;
assert(i);
if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE) && i->default_instance)
return unit_name_replace_instance(i->name, i->default_instance, ret);
ans = strdup(i->name);
if (!ans)
return -ENOMEM;
*ret = ans;
return 0;
}
static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
const UnitFileInstallInfo *i = userdata;
assert(i);
return unit_name_to_prefix(i->name, ret);
}
static int specifier_instance(char specifier, void *data, void *userdata, char **ret) {
const UnitFileInstallInfo *i = userdata;
char *instance;
int r;
assert(i);
r = unit_name_to_instance(i->name, &instance);
if (r < 0)
return r;
if (isempty(instance)) {
instance = strdup(i->default_instance ?: "");
if (!instance)
return -ENOMEM;
}
*ret = instance;
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.
* We don't user getusername_malloc() here, because we don't want to look
* at $USER, to remain consistent with specifer_user_id() below.
*/
t = uid_to_name(getuid());
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;
}
int install_full_printf(UnitFileInstallInfo *i, const char *format, char **ret) {
/* This is similar to unit_full_printf() but does not support
* anything path-related.
*
* %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 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
* %v `uname -r` of the running system
*/
const Specifier table[] = {
{ 'n', specifier_name, NULL },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
{ 'i', specifier_instance, NULL },
{ '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 },
{ 'v', specifier_kernel_release, NULL },
{}
};
assert(i);
assert(format);
assert(ret);
return specifier_printf(format, table, i, ret);
}
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