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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include "unit-name.h"
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const char *arg_dest = "/tmp";
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static bool has_option(const char *haystack, const char *needle) {
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const char *f = haystack;
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while ((f = strstr(f, needle))) {
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if (f > haystack && f[-1] != ',') {
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if (f[l] != 0 && f[l] != ',') {
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static int create_disk(
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const char *options) {
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char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL;
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noauto = has_option(options, "noauto");
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nofail = has_option(options, "nofail");
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if (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) {
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log_error("Failed to allocate unit name.");
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if (asprintf(&p, "%s/%s", arg_dest, n) < 0) {
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log_error("Failed to allocate unit file name.");
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if (!(u = fstab_node_to_udev_node(device))) {
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log_error("Failed to allocate device node.");
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if (!(d = unit_name_from_path(u, ".device"))) {
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log_error("Failed to allocate device name.");
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if (!(f = fopen(p, "wxe"))) {
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log_error("Failed to create unit file: %m");
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"Description=Cryptography Setup for %%I\n"
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"Conflicts=umount.target\n"
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"DefaultDependencies=no\n"
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"BindTo=%s dev-mapper-%%i.device\n"
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"After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n"
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"Before=umount.target\n"
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"Before=local-fs.target\n",
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"Before=cryptsetup.target\n");
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if (password && (streq(password, "/dev/urandom") ||
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streq(password, "/dev/random") ||
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streq(password, "/dev/hw_random")))
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"After=systemd-random-seed-load.service\n");
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"RemainAfterExit=yes\n"
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"TimeoutSec=0\n" /* the binary handles timeouts anyway */
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"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
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"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
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name, u, strempty(password), strempty(options),
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if (has_option(options, "tmp"))
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"ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
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if (has_option(options, "swap"))
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"ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
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log_error("Failed to write file: %m");
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if (asprintf(&from, "../%s", n) < 0) {
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if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) {
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mkdir_parents(to, 0755);
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if (symlink(from, to) < 0) {
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log_error("Failed to create symlink '%s' to '%s': %m", from, to);
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asprintf(&to, "%s/cryptsetup.target.requires/%s", arg_dest, n);
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asprintf(&to, "%s/cryptsetup.target.wants/%s", arg_dest, n);
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mkdir_parents(to, 0755);
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if (symlink(from, to) < 0) {
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log_error("Failed to create symlink '%s' to '%s': %m", from, to);
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e = unit_name_escape(name);
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if (asprintf(&to, "%s/dev-mapper-%s.device.requires/%s", arg_dest, e, n) < 0) {
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mkdir_parents(to, 0755);
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if (symlink(from, to) < 0) {
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log_error("Failed to create symlink '%s' to '%s': %m", from, to);
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int main(int argc, char *argv[]) {
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int r = EXIT_SUCCESS;
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log_error("This program takes one or no arguments.");
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log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
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log_parse_environment();
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if (!(f = fopen("/etc/crypttab", "re"))) {
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log_error("Failed to open /etc/crypttab: %m");
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char line[LINE_MAX], *l;
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char *name = NULL, *device = NULL, *password = NULL, *options = NULL;
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if (!(fgets(line, sizeof(line), f)))
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if (*l == '#' || *l == 0)
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if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) {
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log_error("Failed to parse /etc/crypttab:%u, ignoring.", n);
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if (create_disk(name, device, password, options) < 0)