src/environment-d-generator/environment-d-generator.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2017 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 "sd-path.h"
  22
  23 #include "conf-files.h"
  24 #include "def.h"
  25 #include "escape.h"
  26 #include "fileio.h"
  27 #include "log.h"
  28 #include "path-lookup.h"
  29
  30 static int environment_dirs(char ***ret) {
  31         _cleanup_strv_free_ char **dirs = NULL;
  32         _cleanup_free_ char *c = NULL;
  33         int r;
  34
  35         dirs = strv_split_nulstr(CONF_PATHS_NULSTR("environment.d"));
  36         if (!dirs)
  37                 return -ENOMEM;
  38
  39         /* ~/.config/systemd/environment.d */
  40         r = sd_path_home(SD_PATH_USER_CONFIGURATION, "environment.d", &c);
  41         if (r < 0)
  42                 return r;
  43
  44         r = strv_extend_front(&dirs, c);
  45         if (r < 0)
  46                 return r;
  47
  48         *ret = dirs;
  49         dirs = NULL;
  50         return 0;
  51 }
  52
  53 static int load_and_print(void) {
  54         _cleanup_strv_free_ char **dirs = NULL, **files = NULL, **env = NULL;
  55         char **i;
  56         int r;
  57
  58         r = environment_dirs(&dirs);
  59         if (r < 0)
  60                 return r;
  61
  62         r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char **) dirs);
  63         if (r < 0)
  64                 return r;
  65
  66         /* This will mutate the existing environment, based on the presumption
  67          * that in case of failure, a partial update is better than none. */
  68
  69         STRV_FOREACH(i, files) {
  70                 r = merge_env_file(&env, NULL, *i);
  71                 if (r == -ENOMEM)
  72                         return r;
  73         }
  74
  75         STRV_FOREACH(i, env) {
  76                 char *t;
  77                 _cleanup_free_ char *q = NULL;
  78
  79                 t = strchr(*i, '=');
  80                 assert(t);
  81
  82                 q = shell_maybe_quote(t + 1, ESCAPE_BACKSLASH);
  83                 if (!q)
  84                         return log_oom();
  85
  86                 printf("%.*s=%s\n", (int) (t - *i), *i, q);
  87         }
  88
  89         return 0;
  90 }
  91
  92 int main(int argc, char *argv[]) {
  93         int r;
  94
  95         log_parse_environment();
  96         log_open();
  97
  98         if (argc > 1) {
  99                 log_error("This program takes no arguments.");
 100                 return EXIT_FAILURE;
 101         }
 102
 103         r = load_and_print();
 104         if (r < 0)
 105                 log_error_errno(r, "Failed to load environment.d: %m");
 106
 107         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 108 }