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git.ipfire.org Git - thirdparty/systemd.git/blob - src/cryptsetup/cryptsetup-generator.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
28 #include "unit-name.h"
31 const char *arg_dest
= "/tmp";
33 static bool has_option(const char *haystack
, const char *needle
) {
34 const char *f
= haystack
;
44 while ((f
= strstr(f
, needle
))) {
46 if (f
> haystack
&& f
[-1] != ',') {
51 if (f
[l
] != 0 && f
[l
] != ',') {
62 static int create_disk(
66 const char *options
) {
68 char *p
= NULL
, *n
= NULL
, *d
= NULL
, *u
= NULL
, *from
= NULL
, *to
= NULL
, *e
= NULL
;
76 noauto
= has_option(options
, "noauto");
77 nofail
= has_option(options
, "nofail");
79 n
= unit_name_build_escape("cryptsetup", name
, ".service");
82 log_error("Failed to allocate unit name.");
86 p
= join(arg_dest
, "/", n
, NULL
);
89 log_error("Failed to allocate unit file name.");
93 u
= fstab_node_to_udev_node(device
);
96 log_error("Failed to allocate device node.");
100 d
= unit_name_from_path(u
, ".device");
103 log_error("Failed to allocate device name.");
110 log_error("Failed to create unit file: %m");
115 "# Automatically generated by systemd-cryptsetup-generator\n\n"
117 "Description=Cryptography Setup for %%I\n"
118 "Conflicts=umount.target\n"
119 "DefaultDependencies=no\n"
120 "BindTo=%s dev-mapper-%%i.device\n"
121 "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n"
122 "Before=umount.target\n",
127 "Before=cryptsetup.target\n");
129 if (password
&& (streq(password
, "/dev/urandom") ||
130 streq(password
, "/dev/random") ||
131 streq(password
, "/dev/hw_random")))
133 "After=systemd-random-seed-load.service\n");
136 "Before=local-fs.target\n");
141 "RemainAfterExit=yes\n"
142 "TimeoutSec=0\n" /* the binary handles timeouts anyway */
143 "ExecStart=" SYSTEMD_CRYPTSETUP_PATH
" attach '%s' '%s' '%s' '%s'\n"
144 "ExecStop=" SYSTEMD_CRYPTSETUP_PATH
" detach '%s'\n",
145 name
, u
, strempty(password
), strempty(options
),
148 if (has_option(options
, "tmp"))
150 "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
153 if (has_option(options
, "swap"))
155 "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
162 log_error("Failed to write file: %m");
166 if (asprintf(&from
, "../%s", n
) < 0) {
173 to
= join(arg_dest
, "/", d
, ".wants/", n
, NULL
);
179 mkdir_parents(to
, 0755);
180 if (symlink(from
, to
) < 0) {
181 log_error("Failed to create symlink '%s' to '%s': %m", from
, to
);
189 to
= join(arg_dest
, "/cryptsetup.target.requires/", n
, NULL
);
191 to
= join(arg_dest
, "/cryptsetup.target.wants/", n
, NULL
);
197 mkdir_parents(to
, 0755);
198 if (symlink(from
, to
) < 0) {
199 log_error("Failed to create symlink '%s' to '%s': %m", from
, to
);
208 e
= unit_name_escape(name
);
209 to
= join(arg_dest
, "/dev-mapper-", e
, ".device.requires/", n
, NULL
);
215 mkdir_parents(to
, 0755);
216 if (symlink(from
, to
) < 0) {
217 log_error("Failed to create symlink '%s' to '%s': %m", from
, to
);
239 int main(int argc
, char *argv
[]) {
241 int r
= EXIT_SUCCESS
;
245 log_error("This program takes one or no arguments.");
252 log_set_target(LOG_TARGET_SAFE
);
253 log_parse_environment();
258 f
= fopen("/etc/crypttab", "re");
265 log_error("Failed to open /etc/crypttab: %m");
272 char line
[LINE_MAX
], *l
;
273 char *name
= NULL
, *device
= NULL
, *password
= NULL
, *options
= NULL
;
276 if (!fgets(line
, sizeof(line
), f
))
282 if (*l
== '#' || *l
== 0)
285 k
= sscanf(l
, "%ms %ms %ms %ms", &name
, &device
, &password
, &options
);
286 if (k
< 2 || k
> 4) {
287 log_error("Failed to parse /etc/crypttab:%u, ignoring.", n
);
292 if (create_disk(name
, device
, password
, options
) < 0)