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
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12
  13 #include "format-util.h"
  14 #include "install-printf.h"
  15 #include "install.h"
  16 #include "macro.h"
  17 #include "specifier.h"
  18 #include "string-util.h"
  19 #include "unit-name.h"
  20 #include "user-util.h"
  21
  22 static int specifier_prefix_and_instance(char specifier, void *data, void *userdata, char **ret) {
  23         const UnitFileInstallInfo *i = userdata;
  24         _cleanup_free_ char *prefix = NULL;
  25         int r;
  26
  27         assert(i);
  28
  29         r = unit_name_to_prefix_and_instance(i->name, &prefix);
  30         if (r < 0)
  31                 return r;
  32
  33         if (endswith(prefix, "@") && i->default_instance) {
  34                 char *ans;
  35
  36                 ans = strjoin(prefix, i->default_instance);
  37                 if (!ans)
  38                         return -ENOMEM;
  39                 *ret = ans;
  40         } else
  41                 *ret = TAKE_PTR(prefix);
  42
  43         return 0;
  44 }
  45
  46 static int specifier_name(char specifier, void *data, void *userdata, char **ret) {
  47         const UnitFileInstallInfo *i = userdata;
  48         char *ans;
  49
  50         assert(i);
  51
  52         if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE) && i->default_instance)
  53                 return unit_name_replace_instance(i->name, i->default_instance, ret);
  54
  55         ans = strdup(i->name);
  56         if (!ans)
  57                 return -ENOMEM;
  58         *ret = ans;
  59         return 0;
  60 }
  61
  62 static int specifier_prefix(char specifier, void *data, void *userdata, char **ret) {
  63         const UnitFileInstallInfo *i = userdata;
  64
  65         assert(i);
  66
  67         return unit_name_to_prefix(i->name, ret);
  68 }
  69
  70 static int specifier_instance(char specifier, void *data, void *userdata, char **ret) {
  71         const UnitFileInstallInfo *i = userdata;
  72         char *instance;
  73         int r;
  74
  75         assert(i);
  76
  77         r = unit_name_to_instance(i->name, &instance);
  78         if (r < 0)
  79                 return r;
  80
  81         if (isempty(instance)) {
  82                 r = free_and_strdup(&instance, strempty(i->default_instance));
  83                 if (r < 0)
  84                         return r;
  85         }
  86
  87         *ret = instance;
  88         return 0;
  89 }
  90
  91 int install_full_printf(UnitFileInstallInfo *i, const char *format, char **ret) {
  92
  93         /* This is similar to unit_full_printf() but does not support
  94          * anything path-related.
  95          *
  96          * %n: the full id of the unit                 (foo@bar.waldo)
  97          * %N: the id of the unit without the suffix   (foo@bar)
  98          * %p: the prefix                              (foo)
  99          * %i: the instance                            (bar)
 100
 101          * %U the UID of the running user
 102          * %u the username of running user
 103          * %m the machine ID of the running system
 104          * %H the host name of the running system
 105          * %b the boot ID of the running system
 106          * %v `uname -r` of the running system
 107          */
 108
 109         const Specifier table[] = {
 110                 { 'n', specifier_name,                NULL },
 111                 { 'N', specifier_prefix_and_instance, NULL },
 112                 { 'p', specifier_prefix,              NULL },
 113                 { 'i', specifier_instance,            NULL },
 114
 115                 { 'U', specifier_user_id,             NULL },
 116                 { 'u', specifier_user_name,           NULL },
 117
 118                 { 'm', specifier_machine_id,          NULL },
 119                 { 'H', specifier_host_name,           NULL },
 120                 { 'b', specifier_boot_id,             NULL },
 121                 { 'v', specifier_kernel_release,      NULL },
 122                 {}
 123         };
 124
 125         assert(i);
 126         assert(format);
 127         assert(ret);
 128
 129         return specifier_printf(format, table, i, ret);
 130 }