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 <errno.h>
  23 #include <unistd.h>
  24
  25 #include "alloc-util.h"
  26 #include "dropin.h"
  27 #include "escape.h"
  28 #include "fd-util.h"
  29 #include "fileio.h"
  30 #include "fstab-util.h"
  31 #include "generator.h"
  32 #include "log.h"
  33 #include "macro.h"
  34 #include "mkdir.h"
  35 #include "path-util.h"
  36 #include "special.h"
  37 #include "string-util.h"
  38 #include "time-util.h"
  39 #include "unit-name.h"
  40 #include "util.h"
  41
  42 static int write_fsck_sysroot_service(const char *dir, const char *what) {
  43         _cleanup_free_ char *device = NULL, *escaped = NULL;
  44         _cleanup_fclose_ FILE *f = NULL;
  45         const char *unit;
  46         int r;
  47
  48         escaped = cescape(what);
  49         if (!escaped)
  50                 return log_oom();
  51
  52         unit = strjoina(dir, "/systemd-fsck-root.service");
  53         log_debug("Creating %s", unit);
  54
  55         r = unit_name_from_path(what, ".device", &device);
  56         if (r < 0)
  57                 return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
  58
  59         f = fopen(unit, "wxe");
  60         if (!f)
  61                 return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
  62
  63         fprintf(f,
  64                 "# Automatically generated by %1$s\n\n"
  65                 "[Unit]\n"
  66                 "Documentation=man:systemd-fsck-root.service(8)\n"
  67                 "Description=File System Check on %2$s\n"
  68                 "DefaultDependencies=no\n"
  69                 "BindsTo=%3$s\n"
  70                 "After=%3$s local-fs-pre.target\n"
  71                 "Before=shutdown.target\n"
  72                 "\n"
  73                 "[Service]\n"
  74                 "Type=oneshot\n"
  75                 "RemainAfterExit=yes\n"
  76                 "ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
  77                 "TimeoutSec=0\n",
  78                 program_invocation_short_name,
  79                 what,
  80                 device,
  81                 escaped);
  82
  83         r = fflush_and_check(f);
  84         if (r < 0)
  85                 return log_error_errno(r, "Failed to write unit file %s: %m", unit);
  86
  87         return 0;
  88 }
  89
  90 int generator_write_fsck_deps(
  91                 FILE *f,
  92                 const char *dir,
  93                 const char *what,
  94                 const char *where,
  95                 const char *fstype) {
  96
  97         int r;
  98
  99         assert(f);
 100         assert(dir);
 101         assert(what);
 102         assert(where);
 103
 104         if (!is_device_path(what)) {
 105                 log_warning("Checking was requested for \"%s\", but it is not a device.", what);
 106                 return 0;
 107         }
 108
 109         if (!isempty(fstype) && !streq(fstype, "auto")) {
 110                 r = fsck_exists(fstype);
 111                 if (r < 0)
 112                         log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
 113                 else if (r == 0) {
 114                         /* treat missing check as essentially OK */
 115                         log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
 116                         return 0;
 117                 }
 118         }
 119
 120         if (path_equal(where, "/")) {
 121                 const char *lnk;
 122
 123                 lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
 124
 125                 mkdir_parents(lnk, 0755);
 126                 if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
 127                         return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
 128
 129         } else {
 130                 _cleanup_free_ char *_fsck = NULL;
 131                 const char *fsck;
 132
 133                 if (in_initrd() && path_equal(where, "/sysroot")) {
 134                         r = write_fsck_sysroot_service(dir, what);
 135                         if (r < 0)
 136                                 return r;
 137
 138                         fsck = "systemd-fsck-root.service";
 139                 } else {
 140                         r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
 141                         if (r < 0)
 142                                 return log_error_errno(r, "Failed to create fsck service name: %m");
 143
 144                         fsck = _fsck;
 145                 }
 146
 147                 fprintf(f,
 148                         "Requires=%1$s\n"
 149                         "After=%1$s\n",
 150                         fsck);
 151         }
 152
 153         return 0;
 154 }
 155
 156 int generator_write_timeouts(
 157                 const char *dir,
 158                 const char *what,
 159                 const char *where,
 160                 const char *opts,
 161                 char **filtered) {
 162
 163         /* Allow configuration how long we wait for a device that
 164          * backs a mount point to show up. This is useful to support
 165          * endless device timeouts for devices that show up only after
 166          * user input, like crypto devices. */
 167
 168         _cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
 169         usec_t u;
 170         int r;
 171
 172         r = fstab_filter_options(opts, "comment=systemd.device-timeout\0" "x-systemd.device-timeout\0",
 173                                  NULL, &timeout, filtered);
 174         if (r <= 0)
 175                 return r;
 176
 177         r = parse_sec(timeout, &u);
 178         if (r < 0) {
 179                 log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
 180                 return 0;
 181         }
 182
 183         node = fstab_node_to_udev_node(what);
 184         if (!node)
 185                 return log_oom();
 186
 187         r = unit_name_from_path(node, ".device", &unit);
 188         if (r < 0)
 189                 return log_error_errno(r, "Failed to make unit name from path: %m");
 190
 191         return write_drop_in_format(dir, unit, 50, "device-timeout",
 192                                     "# Automatically generated by %s\n\n"
 193                                     "[Unit]\nJobTimeoutSec=%s",
 194                                     program_invocation_short_name, timeout);
 195 }