src/shared/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 2014 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
  24 #include "util.h"
  25 #include "special.h"
  26 #include "mkdir.h"
  27 #include "unit-name.h"
  28 #include "generator.h"
  29 #include "path-util.h"
  30 #include "fstab-util.h"
  31 #include "fileio.h"
  32 #include "dropin.h"
  33
  34 static int write_fsck_sysroot_service(const char *dir, const char *what) {
  35         const char *unit;
  36         _cleanup_free_ char *device = NULL;
  37         _cleanup_free_ char *escaped;
  38         _cleanup_fclose_ FILE *f = NULL;
  39         int r;
  40
  41         escaped = cescape(what);
  42         if (!escaped)
  43                 return log_oom();
  44
  45         unit = strjoina(dir, "/systemd-fsck-root.service");
  46         log_debug("Creating %s", unit);
  47
  48         r = unit_name_from_path(what, ".device", &device);
  49         if (r < 0)
  50                 return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
  51
  52         f = fopen(unit, "wxe");
  53         if (!f)
  54                 return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
  55
  56         fprintf(f,
  57                 "# Automatically generated by %1$s\n\n"
  58                 "[Unit]\n"
  59                 "Documentation=man:systemd-fsck-root.service(8)\n"
  60                 "Description=File System Check on %2$s\n"
  61                 "DefaultDependencies=no\n"
  62                 "BindsTo=%3$s\n"
  63                 "After=%3$s\n"
  64                 "Before=shutdown.target\n"
  65                 "\n"
  66                 "[Service]\n"
  67                 "Type=oneshot\n"
  68                 "RemainAfterExit=yes\n"
  69                 "ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
  70                 "TimeoutSec=0\n",
  71                 program_invocation_short_name,
  72                 what,
  73                 device,
  74                 escaped);
  75
  76         r = fflush_and_check(f);
  77         if (r < 0)
  78                 return log_error_errno(r, "Failed to write unit file %s: %m", unit);
  79
  80         return 0;
  81 }
  82
  83 int generator_write_fsck_deps(
  84                 FILE *f,
  85                 const char *dir,
  86                 const char *what,
  87                 const char *where,
  88                 const char *fstype) {
  89
  90         int r;
  91
  92         assert(f);
  93         assert(dir);
  94         assert(what);
  95         assert(where);
  96
  97         if (!is_device_path(what)) {
  98                 log_warning("Checking was requested for \"%s\", but it is not a device.", what);
  99                 return 0;
 100         }
 101
 102         if (!isempty(fstype) && !streq(fstype, "auto")) {
 103                 r = fsck_exists(fstype);
 104                 if (r == -ENOENT) {
 105                         /* treat missing check as essentially OK */
 106                         log_debug_errno(r, "Checking was requested for %s, but fsck.%s does not exist: %m", what, fstype);
 107                         return 0;
 108                 } else if (r < 0)
 109                         return log_warning_errno(r, "Checking was requested for %s, but fsck.%s cannot be used: %m", what, fstype);
 110         }
 111
 112         if (path_equal(where, "/")) {
 113                 char *lnk;
 114
 115                 lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
 116
 117                 mkdir_parents(lnk, 0755);
 118                 if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
 119                         return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
 120
 121         } else {
 122                 _cleanup_free_ char *_fsck = NULL;
 123                 const char *fsck;
 124
 125                 if (in_initrd() && path_equal(where, "/sysroot")) {
 126                         r = write_fsck_sysroot_service(dir, what);
 127                         if (r < 0)
 128                                 return r;
 129
 130                         fsck = "systemd-fsck-root.service";
 131                 } else {
 132                         r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
 133                         if (r < 0)
 134                                 return log_error_errno(r, "Failed to create fsck service name: %m");
 135
 136                         fsck = _fsck;
 137                 }
 138
 139                 fprintf(f,
 140                         "RequiresOverridable=%1$s\n"
 141                         "After=%1$s\n",
 142                         fsck);
 143         }
 144
 145         return 0;
 146 }
 147
 148 int generator_write_timeouts(
 149                 const char *dir,
 150                 const char *what,
 151                 const char *where,
 152                 const char *opts,
 153                 char **filtered) {
 154
 155         /* Allow configuration how long we wait for a device that
 156          * backs a mount point to show up. This is useful to support
 157          * endless device timeouts for devices that show up only after
 158          * user input, like crypto devices. */
 159
 160         _cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
 161         usec_t u;
 162         int r;
 163
 164         r = fstab_filter_options(opts, "comment=systemd.device-timeout\0" "x-systemd.device-timeout\0",
 165                                  NULL, &timeout, filtered);
 166         if (r <= 0)
 167                 return r;
 168
 169         r = parse_sec(timeout, &u);
 170         if (r < 0) {
 171                 log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
 172                 return 0;
 173         }
 174
 175         node = fstab_node_to_udev_node(what);
 176         if (!node)
 177                 return log_oom();
 178
 179         r = unit_name_from_path(node, ".device", &unit);
 180         if (r < 0)
 181                 return log_error_errno(r, "Failed to make unit name from path: %m");
 182
 183         return write_drop_in_format(dir, unit, 50, "device-timeout",
 184                                     "# Automatically generated by %s\n\n"
 185                                     "[Unit]\nJobTimeoutSec=" USEC_FMT,
 186                                     program_invocation_short_name,
 187                                     u / USEC_PER_SEC);
 188 }