/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 "unit-name.h" #include "user-util.h" static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) { UnitFileInstallInfo *i = userdata; assert(i); return unit_name_to_prefix_and_instance(i->name, ret); } static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) { 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) { UnitFileInstallInfo *i = userdata; char *instance; int r; assert(i); r = unit_name_to_instance(i->name, &instance); if (r < 0) return r; if (!instance) { instance = strdup(""); 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. */ 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; } 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_string, i->name }, { '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); }