src/efi-boot-generator/efi-boot-generator.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 Lennart Poettering
   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 <unistd.h>
  23 #include <stdlib.h>
  24
  25 #include "efivars.h"
  26 #include "path-util.h"
  27 #include "util.h"
  28 #include "mkdir.h"
  29
  30 static const char *arg_dest = "/tmp";
  31
  32 int main(int argc, char *argv[]) {
  33         int r = EXIT_SUCCESS;
  34         sd_id128_t id;
  35         _cleanup_free_ char *name = NULL;
  36         _cleanup_fclose_ FILE *f = NULL;
  37
  38         if (argc > 1 && argc != 4) {
  39                 log_error("This program takes three or no arguments.");
  40                 return EXIT_FAILURE;
  41         }
  42
  43         if (argc > 1)
  44                 arg_dest = argv[3];
  45
  46         log_set_target(LOG_TARGET_SAFE);
  47         log_parse_environment();
  48         log_open();
  49
  50         umask(0022);
  51
  52         if (!is_efi_boot())
  53                 return EXIT_SUCCESS;
  54
  55         if (dir_is_empty("/boot") <= 0)
  56                 return EXIT_SUCCESS;
  57
  58         r = efi_get_loader_device_part_uuid(&id);
  59         if (r == -ENOENT)
  60                 return EXIT_SUCCESS;
  61         if (r < 0) {
  62                 log_error("Failed to read ESP partition UUID: %s", strerror(-r));
  63                 return EXIT_FAILURE;
  64         }
  65
  66         name = strjoin(arg_dest, "/boot.mount", NULL);
  67         if (!name) {
  68                 log_oom();
  69                 return EXIT_FAILURE;
  70         }
  71
  72         f = fopen(name, "wxe");
  73         if (!f) {
  74                 log_error("Failed to create mount unit file %s: %m", name);
  75                 return EXIT_FAILURE;
  76         }
  77
  78         fprintf(f,
  79                 "# Automatially generated by systemd-efi-boot-generator\n\n"
  80                 "[Unit]\n"
  81                 "Description=EFI System Partition\n\n"
  82                 "[Mount]\n"
  83                 "Where=/boot\n"
  84                 "What=/dev/disk/by-partuuid/%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n"
  85                 "Options=umask=0077\n",
  86                 SD_ID128_FORMAT_VAL(id));
  87
  88         free(name);
  89         name = strjoin(arg_dest, "/boot.automount", NULL);
  90         if (!name) {
  91                 log_oom();
  92                 return EXIT_FAILURE;
  93         }
  94
  95         fclose(f);
  96         f = fopen(name, "wxe");
  97         if (!f) {
  98                 log_error("Failed to create automount unit file %s: %m", name);
  99                 return EXIT_FAILURE;
 100         }
 101
 102         fputs("# Automatially generated by systemd-efi-boot-generator\n\n"
 103               "[Unit]\n"
 104               "Description=EFI System Partition Automount\n\n"
 105               "[Automount]\n"
 106               "Where=/boot\n", f);
 107
 108         free(name);
 109         name = strjoin(arg_dest, "/local-fs.target.wants/boot.automount", NULL);
 110         if (!name) {
 111                 log_oom();
 112                 return EXIT_FAILURE;
 113         }
 114
 115         mkdir_parents(name, 0755);
 116
 117         if (symlink("../boot.automount", name) < 0) {
 118                 log_error("Failed to create symlink: %m");
 119                 return EXIT_FAILURE;
 120         }
 121
 122         return 0;
 123 }