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authorIvan Shapovalov <intelfx100@gmail.com>2014-08-27 00:17:45 +0400
committerLennart Poettering <lennart@poettering.net>2014-08-26 22:19:56 +0200
commitd2c68822c47e37b582820f45b496b2e7d1f9e642 (patch)
tree72471270bb16e7369a37f182866fd1e6aa66e07f /src
parent42483a747489ff46aed3588b78bf4b9480dbeaf7 (diff)
hibernate-resume-generator: add a generator for instantiating the resume unit.
hibernate-resume-generator understands resume= kernel command line parameter and instantiates the systemd-resume@.service accordingly if it is passed. This enables resume from hibernation using device specified on the kernel command line, and it may be specified either as "/dev/disk/by-foo/bar" or "FOO=bar", not only "/dev/sdXY" which is understood by the in-kernel implementation. So now resume= is brought on par with root= in terms of possible ways to specify a device.
Diffstat (limited to 'src')
l---------src/resume-generator/Makefile1
-rw-r--r--src/resume-generator/resume-generator.c95
2 files changed, 96 insertions, 0 deletions
diff --git a/src/resume-generator/Makefile b/src/resume-generator/Makefile
new file mode 120000
index 0000000000..d0b0e8e008
--- /dev/null
+++ b/src/resume-generator/Makefile
@@ -0,0 +1 @@
+../Makefile \ No newline at end of file
diff --git a/src/resume-generator/resume-generator.c b/src/resume-generator/resume-generator.c
new file mode 100644
index 0000000000..f40721662e
--- /dev/null
+++ b/src/resume-generator/resume-generator.c
@@ -0,0 +1,95 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Ivan Shapovalov
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <errno.h>
+
+#include "log.h"
+#include "util.h"
+#include "special.h"
+#include "mkdir.h"
+#include "unit-name.h"
+
+static const char *arg_dest = "/tmp";
+static char *arg_resume_dev = NULL;
+
+static int parse_proc_cmdline_item(const char *key, const char *value) {
+ if (streq(key, "resume") && value) {
+ free(arg_resume_dev);
+ arg_resume_dev = fstab_node_to_udev_node(value);
+ if (!arg_resume_dev)
+ return log_oom();
+ }
+
+ return 0;
+}
+
+static int process_resume(void) {
+ _cleanup_free_ char *name = NULL, *lnk = NULL;
+
+ name = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_dev, ".service");
+ if (!name)
+ return log_oom();
+
+ lnk = strjoin(arg_dest, "/" SPECIAL_SYSINIT_TARGET ".wants/", name, NULL);
+ if (!lnk)
+ return log_oom();
+
+ mkdir_parents_label(lnk, 0755);
+ if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-hibernate-resume@.service", lnk) < 0) {
+ log_error("Failed to create symlink %s: %m", lnk);
+ return -errno;
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r = 0;
+
+ if (argc > 1 && argc != 4) {
+ log_error("This program takes three or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1)
+ arg_dest = argv[1];
+
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ /* Don't even consider resuming outside of initramfs. */
+ if (!in_initrd())
+ return EXIT_SUCCESS;
+
+ if (parse_proc_cmdline(parse_proc_cmdline_item) < 0)
+ return EXIT_FAILURE;
+
+ if (arg_resume_dev != NULL)
+ r = process_resume();
+
+ free(arg_resume_dev);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}