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                         log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
  69                         return -errno;
  70                 }
  71
  72         } else {
  73                 _cleanup_free_ char *fsck = NULL;
  74
  75                 fsck = unit_name_from_path_instance("systemd-fsck", what, ".service");
  76                 if (!fsck)
  77                         return log_oom();
  78
  79                 fprintf(f,
  80                         "RequiresOverridable=%s\n"
  81                         "After=%s\n",
  82                         fsck,
  83                         fsck);
  84         }
  85
  86         return 0;
  87 }
  88
  89 int generator_write_timeouts(const char *dir, const char *what, const char *where,
  90                              const char *opts, char **filtered) {
  91
  92         /* Allow configuration how long we wait for a device that
  93          * backs a mount point to show up. This is useful to support
  94          * endless device timeouts for devices that show up only after
  95          * user input, like crypto devices. */
  96
  97         _cleanup_free_ char *node = NULL, *unit = NULL, *t = NULL;
  98         char *start, *timeout;
  99         usec_t u;
 100         int r;
 101         size_t len;
 102
 103         if ((start = mount_test_option(opts, "comment=systemd.device-timeout")))
 104                 timeout = start + 31;
 105         else if ((start = mount_test_option(opts, "x-systemd.device-timeout")))
 106                 timeout = start + 25;
 107         else {
 108                 if (filtered) {
 109                         *filtered = strdup(opts ?: "");
 110                         if (!*filtered)
 111                                 return log_oom();
 112                 }
 113
 114                 return 0;
 115         }
 116
 117         len = strcspn(timeout, ",;" WHITESPACE);
 118         t = strndup(timeout, len);
 119         if (!t)
 120                 return -ENOMEM;
 121
 122         if (filtered) {
 123                 char *prefix, *postfix;
 124
 125                 prefix = strndupa(opts, start - opts - (start != opts));
 126                 postfix = timeout + len + (start == opts && timeout[len] != '\0');
 127                 *filtered = strjoin(prefix, *postfix ? postfix : NULL, NULL);
 128                 if (!*filtered)
 129                         return log_oom();
 130         }
 131
 132         r = parse_sec(t, &u);
 133         if (r < 0) {
 134                 log_warning("Failed to parse timeout for %s, ignoring: %s",
 135                             where, timeout);
 136                 return 0;
 137         }
 138
 139         node = fstab_node_to_udev_node(what);
 140         if (!node)
 141                 return log_oom();
 142
 143         unit = unit_name_from_path(node, ".device");
 144         if (!unit)
 145                 return -ENOMEM;
 146
 147         return write_drop_in_format(dir, unit, 50, "device-timeout",
 148                                     "# Automatically generated by %s\n\n"
 149                                     "[Unit]\nJobTimeoutSec=" USEC_FMT,
 150                                     program_invocation_short_name,
 151                                     u / USEC_PER_SEC);
 152 }