src/shared/install-printf.c

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