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 <string.h>
  23 #include <unistd.h>
  24
  25 #include "util.h"
  26 #include "special.h"
  27 #include "mkdir.h"
  28 #include "unit-name.h"
  29 #include "generator.h"
  30 #include "path-util.h"
  31 #include "dropin.h"
  32
  33 int generator_write_fsck_deps(
  34                 FILE *f,
  35                 const char *dest,
  36                 const char *what,
  37                 const char *where,
  38                 const char *fstype) {
  39
  40         assert(f);
  41         assert(dest);
  42         assert(what);
  43         assert(where);
  44
  45         if (!is_device_path(what)) {
  46                 log_warning("Checking was requested for \"%s\", but it is not a device.", what);
  47                 return 0;
  48         }
  49
  50         if (!isempty(fstype) && !streq(fstype, "auto")) {
  51                 int r;
  52                 r = fsck_exists(fstype);
  53                 if (r == -ENOENT) {
  54                         /* treat missing check as essentially OK */
  55                         log_debug_errno(-r, "Checking was requested for %s, but fsck.%s does not exist: %m", what, fstype);
  56                         return 0;
  57                 } else if (r < 0) {
  58                         log_warning_errno(-r, "Checking was requested for %s, but fsck.%s cannot be used: %m", what, fstype);
  59                         return r;
  60                 }
  61         }
  62
  63         if (streq(where, "/")) {
  64                 char *lnk;
  65
  66                 lnk = strappenda(dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
  67
  68                 mkdir_parents(lnk, 0755);
  69                 if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0) {
  70                         log_error("Failed to create symlink %s: %m", lnk);
  71                         return -errno;
  72                 }
  73
  74         } else {
  75                 _cleanup_free_ char *fsck = NULL;
  76
  77                 fsck = unit_name_from_path_instance("systemd-fsck", what, ".service");
  78                 if (!fsck)
  79                         return log_oom();
  80
  81                 fprintf(f,
  82                         "RequiresOverridable=%s\n"
  83                         "After=%s\n",
  84                         fsck,
  85                         fsck);
  86         }
  87
  88         return 0;
  89 }
  90
  91 int generator_write_timeouts(const char *dir, const char *what, const char *where,
  92                              const char *opts, char **filtered) {
  93
  94         /* Allow configuration how long we wait for a device that
  95          * backs a mount point to show up. This is useful to support
  96          * endless device timeouts for devices that show up only after
  97          * user input, like crypto devices. */
  98
  99         _cleanup_free_ char *node = NULL, *unit = NULL, *t = NULL;
 100         char *start, *timeout;
 101         usec_t u;
 102         int r;
 103         size_t len;
 104
 105         if ((start = mount_test_option(opts, "comment=systemd.device-timeout")))
 106                 timeout = start + 31;
 107         else if ((start = mount_test_option(opts, "x-systemd.device-timeout")))
 108                 timeout = start + 25;
 109         else {
 110                 if (filtered) {
 111                         *filtered = strdup(opts ?: "");
 112                         if (!*filtered)
 113                                 return log_oom();
 114                 }
 115
 116                 return 0;
 117         }
 118
 119         len = strcspn(timeout, ",;" WHITESPACE);
 120         t = strndup(timeout, len);
 121         if (!t)
 122                 return -ENOMEM;
 123
 124         if (filtered) {
 125                 char *prefix, *postfix;
 126
 127                 prefix = strndupa(opts, start - opts - (start != opts));
 128                 postfix = timeout + len + (start == opts && timeout[len] != '\0');
 129                 *filtered = strjoin(prefix, *postfix ? postfix : NULL, NULL);
 130                 if (!*filtered)
 131                         return log_oom();
 132         }
 133
 134         r = parse_sec(t, &u);
 135         if (r < 0) {
 136                 log_warning("Failed to parse timeout for %s, ignoring: %s",
 137                             where, timeout);
 138                 return 0;
 139         }
 140
 141         node = fstab_node_to_udev_node(what);
 142         if (!node)
 143                 return log_oom();
 144
 145         unit = unit_name_from_path(node, ".device");
 146         if (!unit)
 147                 return -ENOMEM;
 148
 149         return write_drop_in_format(dir, unit, 50, "device-timeout",
 150                                     "# Automatically generated by %s\n\n"
 151                                     "[Unit]\nJobTimeoutSec=" USEC_FMT,
 152                                     program_invocation_short_name,
 153                                     u / USEC_PER_SEC);
 154 }