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