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-rw-r--r--src/systemd-hibernate-resume/hibernate-resume-generator.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/src/systemd-hibernate-resume/hibernate-resume-generator.c b/src/systemd-hibernate-resume/hibernate-resume-generator.c
new file mode 100644
index 0000000000..d7ee80d58f
--- /dev/null
+++ b/src/systemd-hibernate-resume/hibernate-resume-generator.c
@@ -0,0 +1,99 @@
+/***
+ 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 <errno.h>
+#include <stdio.h>
+
+#include "alloc-util.h"
+#include "fstab-util.h"
+#include "log.h"
+#include "mkdir.h"
+#include "proc-cmdline.h"
+#include "special.h"
+#include "string-util.h"
+#include "unit-name.h"
+#include "util.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;
+ int r;
+
+ if (!arg_resume_dev)
+ return 0;
+
+ r = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_dev, ".service", &name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ 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)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+ 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;
+
+ r = parse_proc_cmdline(parse_proc_cmdline_item);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+ r = process_resume();
+ free(arg_resume_dev);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}