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                         return log_warning_errno(r, "Checking was requested for %s, but fsck.%s cannot be used: %m", what, fstype);
  59         }
  60
  61         if (streq(where, "/")) {
  62                 char *lnk;
  63
  64                 lnk = strappenda(dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
  65
  66                 mkdir_parents(lnk, 0755);
  67                 if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
  68                         return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
  69
  70         } else {
  71                 _cleanup_free_ char *fsck = NULL;
  72
  73                 fsck = unit_name_from_path_instance("systemd-fsck", what, ".service");
  74                 if (!fsck)
  75                         return log_oom();
  76
  77                 fprintf(f,
  78                         "RequiresOverridable=%s\n"
  79                         "After=%s\n",
  80                         fsck,
  81                         fsck);
  82         }
  83
  84         return 0;
  85 }
  86
  87 int generator_write_timeouts(const char *dir, const char *what, const char *where,
  88                              const char *opts, char **filtered) {
  89
  90         /* Allow configuration how long we wait for a device that
  91          * backs a mount point to show up. This is useful to support
  92          * endless device timeouts for devices that show up only after
  93          * user input, like crypto devices. */
  94
  95         _cleanup_free_ char *node = NULL, *unit = NULL, *t = NULL;
  96         char *start, *timeout;
  97         usec_t u;
  98         int r;
  99         size_t len;
 100
 101         if ((start = mount_test_option(opts, "comment=systemd.device-timeout")))
 102                 timeout = start + 31;
 103         else if ((start = mount_test_option(opts, "x-systemd.device-timeout")))
 104                 timeout = start + 25;
 105         else {
 106                 if (filtered) {
 107                         *filtered = strdup(opts ?: "");
 108                         if (!*filtered)
 109                                 return log_oom();
 110                 }
 111
 112                 return 0;
 113         }
 114
 115         len = strcspn(timeout, ",;" WHITESPACE);
 116         t = strndup(timeout, len);
 117         if (!t)
 118                 return -ENOMEM;
 119
 120         if (filtered) {
 121                 char *prefix, *postfix;
 122
 123                 prefix = strndupa(opts, start - opts - (start != opts));
 124                 postfix = timeout + len + (start == opts && timeout[len] != '\0');
 125                 *filtered = strjoin(prefix, *postfix ? postfix : NULL, NULL);
 126                 if (!*filtered)
 127                         return log_oom();
 128         }
 129
 130         r = parse_sec(t, &u);
 131         if (r < 0) {
 132                 log_warning("Failed to parse timeout for %s, ignoring: %s",
 133                             where, timeout);
 134                 return 0;
 135         }
 136
 137         node = fstab_node_to_udev_node(what);
 138         if (!node)
 139                 return log_oom();
 140
 141         unit = unit_name_from_path(node, ".device");
 142         if (!unit)
 143                 return -ENOMEM;
 144
 145         return write_drop_in_format(dir, unit, 50, "device-timeout",
 146                                     "# Automatically generated by %s\n\n"
 147                                     "[Unit]\nJobTimeoutSec=" USEC_FMT,
 148                                     program_invocation_short_name,
 149                                     u / USEC_PER_SEC);
 150 }