1 files changed, 130 insertions, 0 deletions
diff --git a/src/hibernate-resume/hibernate-resume-generator.c b/src/hibernate-resume/hibernate-resume-generator.c
new file mode 100644
index 0000000..0168428
--- /dev/null
+++ b/src/hibernate-resume/hibernate-resume-generator.c
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "dropin.h"
+#include "generator.h"
+#include "hibernate-resume-config.h"
+#include "initrd-util.h"
+#include "log.h"
+#include "main-func.h"
+#include "parse-util.h"
+#include "proc-cmdline.h"
+#include "special.h"
+#include "static-destruct.h"
+#include "string-util.h"
+#include "unit-name.h"
+
+static const char *arg_dest = NULL;
+static char *arg_resume_options = NULL;
+static char *arg_root_options = NULL;
+static bool arg_noresume = false;
+
+STATIC_DESTRUCTOR_REGISTER(arg_resume_options, freep);
+STATIC_DESTRUCTOR_REGISTER(arg_root_options, freep);
+
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+        assert(key);
+
+        if (streq(key, "resumeflags")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                if (!strextend_with_separator(&arg_resume_options, ",", value))
+                        return log_oom();
+
+        } else if (streq(key, "rootflags")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                if (!strextend_with_separator(&arg_root_options, ",", value))
+                        return log_oom();
+
+        } else if (streq(key, "noresume")) {
+
+                if (value) {
+                        log_warning("'noresume' kernel command line option specified with an argument, ignoring.");
+                        return 0;
+                }
+
+                arg_noresume = true;
+        }
+
+        return 0;
+}
+
+static int process_resume(const HibernateInfo *info) {
+        _cleanup_free_ char *device_unit = NULL;
+        int r;
+
+        assert(info);
+
+        r = unit_name_from_path(info->device, ".device", &device_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to generate device unit name from path '%s': %m", info->device);
+
+        /* If hibernate info is acquired from EFI variable, don't wait forever by default. Otherwise, if
+         * swap device is not present and HibernateLocation was not correctly cleared, we end up blocking
+         * the boot process infinitely. */
+        r = write_drop_in_format(arg_dest, device_unit, 40, "device-timeout",
+                                 "# Automatically generated by systemd-hibernate-resume-generator\n\n"
+                                 "[Unit]\n"
+                                 "JobTimeoutSec=%s\n",
+                                 info->cmdline ? "infinity" : "2min");
+        if (r < 0)
+                log_warning_errno(r, "Failed to write device timeout drop-in, ignoring: %m");
+
+        r = generator_write_timeouts(arg_dest,
+                                     info->device,
+                                     info->device,
+                                     arg_resume_options ?: arg_root_options,
+                                     NULL);
+        if (r < 0)
+                log_warning_errno(r, "Failed to write device timeout drop-in, ignoring: %m");
+
+        r = write_drop_in_format(arg_dest, SPECIAL_HIBERNATE_RESUME_SERVICE, 90, "device-dependency",
+                                 "# Automatically generated by systemd-hibernate-resume-generator\n\n"
+                                 "[Unit]\n"
+                                 "BindsTo=%1$s\n"
+                                 "After=%1$s\n",
+                                 device_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write device dependency drop-in: %m");
+
+        return generator_add_symlink(arg_dest, SPECIAL_SYSINIT_TARGET, "wants", SPECIAL_HIBERNATE_RESUME_SERVICE);
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+        _cleanup_(hibernate_info_done) HibernateInfo info = {};
+        int r;
+
+        arg_dest = ASSERT_PTR(dest);
+
+        /* Don't even consider resuming outside of initrd. */
+        if (!in_initrd()) {
+                log_debug("Not running in initrd, exiting.");
+                return 0;
+        }
+
+        r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
+        if (r < 0)
+                log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+        if (arg_noresume) {
+                log_info("Found 'noresume' on the kernel command line, exiting.");
+                return 0;
+        }
+
+        r = acquire_hibernate_info(&info);
+        if (r == -ENODEV) {
+                log_debug_errno(r, "No resume device found, exiting.");
+                return 0;
+        }
+        if (r < 0)
+                return r;
+
+        return process_resume(&info);
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);