Line data    Source code

       1             : /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
       2             : 
       3             : /***
       4             :   This file is part of systemd.
       5             : 
       6             :   Copyright 2013 Zbigniew Jędrzejewski-Szmek
       7             : 
       8             :   systemd is free software; you can redistribute it and/or modify it
       9             :   under the terms of the GNU Lesser General Public License as published by
      10             :   the Free Software Foundation; either version 2.1 of the License, or
      11             :   (at your option) any later version.
      12             : 
      13             :   systemd is distributed in the hope that it will be useful, but
      14             :   WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
      16             :   Lesser General Public License for more details.
      17             : 
      18             :   You should have received a copy of the GNU Lesser General Public License
      19             :   along with systemd; If not, see <http://www.gnu.org/licenses/>.
      20             : ***/
      21             : 
      22             : #include <stdlib.h>
      23             : 
      24             : #include "specifier.h"
      25             : #include "unit-name.h"
      26             : #include "util.h"
      27             : #include "install-printf.h"
      28             : #include "formats-util.h"
      29             : 
      30           2 : static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) {
      31           2 :         UnitFileInstallInfo *i = userdata;
      32             : 
      33           2 :         assert(i);
      34             : 
      35           2 :         return unit_name_to_prefix_and_instance(i->name, ret);
      36             : }
      37             : 
      38           2 : static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
      39           2 :         UnitFileInstallInfo *i = userdata;
      40             : 
      41           2 :         assert(i);
      42             : 
      43           2 :         return unit_name_to_prefix(i->name, ret);
      44             : }
      45             : 
      46           1 : static int specifier_instance(char specifier, void *data, void *userdata, char **ret) {
      47           1 :         UnitFileInstallInfo *i = userdata;
      48             :         char *instance;
      49             :         int r;
      50             : 
      51           1 :         assert(i);
      52             : 
      53           1 :         r = unit_name_to_instance(i->name, &instance);
      54           1 :         if (r < 0)
      55           0 :                 return r;
      56             : 
      57           1 :         if (!instance) {
      58           1 :                 instance = strdup("");
      59           1 :                 if (!instance)
      60           0 :                         return -ENOMEM;
      61             :         }
      62             : 
      63           1 :         *ret = instance;
      64           1 :         return 0;
      65             : }
      66             : 
      67           8 : static int specifier_user_name(char specifier, void *data, void *userdata, char **ret) {
      68           8 :         UnitFileInstallInfo *i = userdata;
      69             :         const char *username;
      70          16 :         _cleanup_free_ char *tmp = NULL;
      71           8 :         char *printed = NULL;
      72             : 
      73           8 :         assert(i);
      74             : 
      75           8 :         if (i->user)
      76           4 :                 username = i->user;
      77             :         else
      78             :                 /* get USER env from env or our own uid */
      79           4 :                 username = tmp = getusername_malloc();
      80             : 
      81           8 :         switch (specifier) {
      82             :         case 'u':
      83           4 :                 printed = strdup(username);
      84           4 :                 break;
      85             :         case 'U': {
      86             :                 /* fish username from passwd */
      87             :                 uid_t uid;
      88             :                 int r;
      89             : 
      90           4 :                 r = get_user_creds(&username, &uid, NULL, NULL, NULL);
      91           4 :                 if (r < 0)
      92           4 :                         return r;
      93             : 
      94           2 :                 if (asprintf(&printed, UID_FMT, uid) < 0)
      95           0 :                         return -ENOMEM;
      96           2 :                 break;
      97             :         }}
      98             : 
      99             : 
     100           6 :         *ret = printed;
     101           6 :         return 0;
     102             : }
     103             : 
     104             : 
     105          24 : int install_full_printf(UnitFileInstallInfo *i, const char *format, char **ret) {
     106             : 
     107             :         /* This is similar to unit_full_printf() but does not support
     108             :          * anything path-related.
     109             :          *
     110             :          * %n: the full id of the unit                 (foo@bar.waldo)
     111             :          * %N: the id of the unit without the suffix   (foo@bar)
     112             :          * %p: the prefix                              (foo)
     113             :          * %i: the instance                            (bar)
     114             : 
     115             :          * %U the UID of the configured user or running user
     116             :          * %u the username of the configured user or running user
     117             :          * %m the machine ID of the running system
     118             :          * %H the host name of the running system
     119             :          * %b the boot ID of the running system
     120             :          * %v `uname -r` of the running system
     121             :          */
     122             : 
     123          48 :         const Specifier table[] = {
     124          24 :                 { 'n', specifier_string,              i->name },
     125             :                 { 'N', specifier_prefix_and_instance, NULL },
     126             :                 { 'p', specifier_prefix,              NULL },
     127             :                 { 'i', specifier_instance,            NULL },
     128             : 
     129             :                 { 'U', specifier_user_name,           NULL },
     130             :                 { 'u', specifier_user_name,           NULL },
     131             : 
     132             :                 { 'm', specifier_machine_id,          NULL },
     133             :                 { 'H', specifier_host_name,           NULL },
     134             :                 { 'b', specifier_boot_id,             NULL },
     135             :                 { 'v', specifier_kernel_release,      NULL },
     136             :                 {}
     137             :         };
     138             : 
     139          24 :         assert(i);
     140          24 :         assert(format);
     141          24 :         assert(ret);
     142             : 
     143          24 :         return specifier_printf(format, table, i, ret);
     144             : }