src/shared/install-printf.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 #include "format-util.h"
   9 #include "install-printf.h"
  10 #include "install.h"
  11 #include "macro.h"
  12 #include "specifier.h"
  13 #include "string-util.h"
  14 #include "unit-name.h"
  15 #include "user-util.h"
  16
  17 static int specifier_prefix_and_instance(char specifier, const void *data, const void *userdata, char **ret) {
  18         const UnitFileInstallInfo *i = userdata;
  19         _cleanup_free_ char *prefix = NULL;
  20         int r;
  21
  22         assert(i);
  23
  24         r = unit_name_to_prefix_and_instance(i->name, &prefix);
  25         if (r < 0)
  26                 return r;
  27
  28         if (endswith(prefix, "@") && i->default_instance) {
  29                 char *ans;
  30
  31                 ans = strjoin(prefix, i->default_instance);
  32                 if (!ans)
  33                         return -ENOMEM;
  34                 *ret = ans;
  35         } else
  36                 *ret = TAKE_PTR(prefix);
  37
  38         return 0;
  39 }
  40
  41 static int specifier_name(char specifier, const void *data, const void *userdata, char **ret) {
  42         const UnitFileInstallInfo *i = userdata;
  43         char *ans;
  44
  45         assert(i);
  46
  47         if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE) && i->default_instance)
  48                 return unit_name_replace_instance(i->name, i->default_instance, ret);
  49
  50         ans = strdup(i->name);
  51         if (!ans)
  52                 return -ENOMEM;
  53         *ret = ans;
  54         return 0;
  55 }
  56
  57 static int specifier_prefix(char specifier, const void *data, const void *userdata, char **ret) {
  58         const UnitFileInstallInfo *i = userdata;
  59
  60         assert(i);
  61
  62         return unit_name_to_prefix(i->name, ret);
  63 }
  64
  65 static int specifier_instance(char specifier, const void *data, const void *userdata, char **ret) {
  66         const UnitFileInstallInfo *i = userdata;
  67         char *instance;
  68         int r;
  69
  70         assert(i);
  71
  72         r = unit_name_to_instance(i->name, &instance);
  73         if (r < 0)
  74                 return r;
  75
  76         if (isempty(instance)) {
  77                 r = free_and_strdup(&instance, strempty(i->default_instance));
  78                 if (r < 0)
  79                         return r;
  80         }
  81
  82         *ret = instance;
  83         return 0;
  84 }
  85
  86 static int specifier_last_component(char specifier, const void *data, const void *userdata, char **ret) {
  87         _cleanup_free_ char *prefix = NULL;
  88         char *dash;
  89         int r;
  90
  91         r = specifier_prefix(specifier, data, userdata, &prefix);
  92         if (r < 0)
  93                 return r;
  94
  95         dash = strrchr(prefix, '-');
  96         if (dash) {
  97                 dash = strdup(dash + 1);
  98                 if (!dash)
  99                         return -ENOMEM;
 100                 *ret = dash;
 101         } else
 102                 *ret = TAKE_PTR(prefix);
 103
 104         return 0;
 105 }
 106
 107 int install_full_printf(const UnitFileInstallInfo *i, const char *format, char **ret) {
 108         /* This is similar to unit_full_printf() but does not support
 109          * anything path-related.
 110          *
 111          * %n: the full id of the unit                 (foo@bar.waldo)
 112          * %N: the id of the unit without the suffix   (foo@bar)
 113          * %p: the prefix                              (foo)
 114          * %i: the instance                            (bar)
 115
 116          * %U the UID of the running user
 117          * %u the username of running user
 118          * %m the machine ID of the running system
 119          * %H the host name of the running system
 120          * %b the boot ID of the running system
 121          * %v `uname -r` of the running system
 122          */
 123
 124         const Specifier table[] = {
 125                 { 'n', specifier_name,                NULL },
 126                 { 'N', specifier_prefix_and_instance, NULL },
 127                 { 'p', specifier_prefix,              NULL },
 128                 { 'i', specifier_instance,            NULL },
 129                 { 'j', specifier_last_component,      NULL },
 130
 131                 { 'g', specifier_group_name,          NULL },
 132                 { 'G', specifier_group_id,            NULL },
 133                 { 'U', specifier_user_id,             NULL },
 134                 { 'u', specifier_user_name,           NULL },
 135
 136                 { 'm', specifier_machine_id,          NULL },
 137                 { 'H', specifier_host_name,           NULL },
 138                 { 'b', specifier_boot_id,             NULL },
 139                 { 'v', specifier_kernel_release,      NULL },
 140                 {}
 141         };
 142
 143         assert(i);
 144         assert(format);
 145         assert(ret);
 146
 147         return specifier_printf(format, table, i, ret);
 148 }