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 "dropin.h"
  25 #include "escape.h"
  26 #include "fileio.h"
  27 #include "fstab-util.h"
  28 #include "mkdir.h"
  29 #include "path-util.h"
  30 #include "special.h"
  31 #include "string-util.h"
  32 #include "unit-name.h"
  33 #include "util.h"
  34 #include "generator.h"
  35
  36 static int write_fsck_sysroot_service(const char *dir, const char *what) {
  37         _cleanup_free_ char *device = NULL, *escaped = NULL;
  38         _cleanup_fclose_ FILE *f = NULL;
  39         const char *unit;
  40         int r;
  41
  42         escaped = cescape(what);
  43         if (!escaped)
  44                 return log_oom();
  45
  46         unit = strjoina(dir, "/systemd-fsck-root.service");
  47         log_debug("Creating %s", unit);
  48
  49         r = unit_name_from_path(what, ".device", &device);
  50         if (r < 0)
  51                 return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
  52
  53         f = fopen(unit, "wxe");
  54         if (!f)
  55                 return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
  56
  57         fprintf(f,
  58                 "# Automatically generated by %1$s\n\n"
  59                 "[Unit]\n"
  60                 "Documentation=man:systemd-fsck-root.service(8)\n"
  61                 "Description=File System Check on %2$s\n"
  62                 "DefaultDependencies=no\n"
  63                 "BindsTo=%3$s\n"
  64                 "After=%3$s\n"
  65                 "Before=shutdown.target\n"
  66                 "\n"
  67                 "[Service]\n"
  68                 "Type=oneshot\n"
  69                 "RemainAfterExit=yes\n"
  70                 "ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
  71                 "TimeoutSec=0\n",
  72                 program_invocation_short_name,
  73                 what,
  74                 device,
  75                 escaped);
  76
  77         r = fflush_and_check(f);
  78         if (r < 0)
  79                 return log_error_errno(r, "Failed to write unit file %s: %m", unit);
  80
  81         return 0;
  82 }
  83
  84 int generator_write_fsck_deps(
  85                 FILE *f,
  86                 const char *dir,
  87                 const char *what,
  88                 const char *where,
  89                 const char *fstype) {
  90
  91         int r;
  92
  93         assert(f);
  94         assert(dir);
  95         assert(what);
  96         assert(where);
  97
  98         if (!is_device_path(what)) {
  99                 log_warning("Checking was requested for \"%s\", but it is not a device.", what);
 100                 return 0;
 101         }
 102
 103         if (!isempty(fstype) && !streq(fstype, "auto")) {
 104                 r = fsck_exists(fstype);
 105                 if (r < 0)
 106                         log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
 107                 else if (r == 0) {
 108                         /* treat missing check as essentially OK */
 109                         log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
 110                         return 0;
 111                 }
 112         }
 113
 114         if (path_equal(where, "/")) {
 115                 const char *lnk;
 116
 117                 lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
 118
 119                 mkdir_parents(lnk, 0755);
 120                 if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
 121                         return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
 122
 123         } else {
 124                 _cleanup_free_ char *_fsck = NULL;
 125                 const char *fsck;
 126
 127                 if (in_initrd() && path_equal(where, "/sysroot")) {
 128                         r = write_fsck_sysroot_service(dir, what);
 129                         if (r < 0)
 130                                 return r;
 131
 132                         fsck = "systemd-fsck-root.service";
 133                 } else {
 134                         r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
 135                         if (r < 0)
 136                                 return log_error_errno(r, "Failed to create fsck service name: %m");
 137
 138                         fsck = _fsck;
 139                 }
 140
 141                 fprintf(f,
 142                         "RequiresOverridable=%1$s\n"
 143                         "After=%1$s\n",
 144                         fsck);
 145         }
 146
 147         return 0;
 148 }
 149
 150 int generator_write_timeouts(
 151                 const char *dir,
 152                 const char *what,
 153                 const char *where,
 154                 const char *opts,
 155                 char **filtered) {
 156
 157         /* Allow configuration how long we wait for a device that
 158          * backs a mount point to show up. This is useful to support
 159          * endless device timeouts for devices that show up only after
 160          * user input, like crypto devices. */
 161
 162         _cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
 163         usec_t u;
 164         int r;
 165
 166         r = fstab_filter_options(opts, "comment=systemd.device-timeout\0" "x-systemd.device-timeout\0",
 167                                  NULL, &timeout, filtered);
 168         if (r <= 0)
 169                 return r;
 170
 171         r = parse_sec(timeout, &u);
 172         if (r < 0) {
 173                 log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
 174                 return 0;
 175         }
 176
 177         node = fstab_node_to_udev_node(what);
 178         if (!node)
 179                 return log_oom();
 180
 181         r = unit_name_from_path(node, ".device", &unit);
 182         if (r < 0)
 183                 return log_error_errno(r, "Failed to make unit name from path: %m");
 184
 185         return write_drop_in_format(dir, unit, 50, "device-timeout",
 186                                     "# Automatically generated by %s\n\n"
 187                                     "[Unit]\nJobTimeoutSec=" USEC_FMT,
 188                                     program_invocation_short_name,
 189                                     u / USEC_PER_SEC);
 190 }