src/shared/install-printf.c

   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 <assert.h>
  23 #include <stdlib.h>
  24
  25 #include "specifier.h"
  26 #include "unit-name.h"
  27 #include "util.h"
  28 #include "install-printf.h"
  29
  30 static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) {
  31         InstallInfo *i = userdata;
  32         char *n;
  33
  34         assert(i);
  35
  36         n = unit_name_to_prefix_and_instance(i->name);
  37         if (!n)
  38                 return -ENOMEM;
  39
  40         *ret = n;
  41         return 0;
  42 }
  43
  44 static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
  45         InstallInfo *i = userdata;
  46         char *n;
  47
  48         assert(i);
  49
  50         n = unit_name_to_prefix(i->name);
  51         if (!n)
  52                 return -ENOMEM;
  53
  54         *ret = n;
  55         return 0;
  56 }
  57
  58 static int specifier_instance(char specifier, void *data, void *userdata, char **ret) {
  59         InstallInfo *i = userdata;
  60         char *instance;
  61         int r;
  62
  63         assert(i);
  64
  65         r = unit_name_to_instance(i->name, &instance);
  66         if (r < 0)
  67                 return r;
  68
  69         if (!instance) {
  70                 instance = strdup("");
  71                 if (!instance)
  72                         return -ENOMEM;
  73         }
  74
  75         *ret = instance;
  76         return 0;
  77 }
  78
  79 static int specifier_user_name(char specifier, void *data, void *userdata, char **ret) {
  80         InstallInfo *i = userdata;
  81         const char *username;
  82         _cleanup_free_ char *tmp = NULL;
  83         char *printed = NULL;
  84
  85         assert(i);
  86
  87         if (i->user)
  88                 username = i->user;
  89         else
  90                 /* get USER env from env or our own uid */
  91                 username = tmp = getusername_malloc();
  92
  93         switch (specifier) {
  94         case 'u':
  95                 printed = strdup(username);
  96                 break;
  97         case 'U': {
  98                 /* fish username from passwd */
  99                 uid_t uid;
 100                 int r;
 101
 102                 r = get_user_creds(&username, &uid, NULL, NULL, NULL);
 103                 if (r < 0)
 104                         return r;
 105
 106                 if (asprintf(&printed, UID_FMT, uid) < 0)
 107                         return -ENOMEM;
 108                 break;
 109         }}
 110
 111
 112         *ret = printed;
 113         return 0;
 114 }
 115
 116
 117 int install_full_printf(InstallInfo *i, const char *format, char **ret) {
 118
 119         /* This is similar to unit_full_printf() but does not support
 120          * anything path-related.
 121          *
 122          * %n: the full id of the unit                 (foo@bar.waldo)
 123          * %N: the id of the unit without the suffix   (foo@bar)
 124          * %p: the prefix                              (foo)
 125          * %i: the instance                            (bar)
 126
 127          * %U the UID of the configured user or running user
 128          * %u the username of the configured user or running user
 129          * %m the machine ID of the running system
 130          * %H the host name of the running system
 131          * %b the boot ID of the running system
 132          * %v `uname -r` of the running system
 133          */
 134
 135         const Specifier table[] = {
 136                 { 'n', specifier_string,              i->name },
 137                 { 'N', specifier_prefix_and_instance, NULL },
 138                 { 'p', specifier_prefix,              NULL },
 139                 { 'i', specifier_instance,            NULL },
 140
 141                 { 'U', specifier_user_name,           NULL },
 142                 { 'u', specifier_user_name,           NULL },
 143
 144                 { 'm', specifier_machine_id,          NULL },
 145                 { 'H', specifier_host_name,           NULL },
 146                 { 'b', specifier_boot_id,             NULL },
 147                 { 'v', specifier_kernel_release,      NULL },
 148                 {}
 149         };
 150
 151         assert(i);
 152         assert(format);
 153         assert(ret);
 154
 155         return specifier_printf(format, table, i, ret);
 156 }