1 files changed, 135 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..82c2a56
--- /dev/null
+++ b/src/hibernate-resume/hibernate-resume-generator.c
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "dropin.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "log.h"
+#include "main-func.h"
+#include "mkdir-label.h"
+#include "proc-cmdline.h"
+#include "special.h"
+#include "string-util.h"
+#include "unit-name.h"
+
+static const char *arg_dest = NULL;
+static char *arg_resume_device = NULL;
+static char *arg_resume_options = NULL;
+static char *arg_root_options = NULL;
+static bool arg_noresume = false;
+
+STATIC_DESTRUCTOR_REGISTER(arg_resume_device, freep);
+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) {
+
+        if (streq(key, "resume")) {
+                char *s;
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                s = fstab_node_to_udev_node(value);
+                if (!s)
+                        return log_oom();
+
+                free_and_replace(arg_resume_device, s);
+
+        } else 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 switch specified with an argument, ignoring.");
+                        return 0;
+                }
+
+                arg_noresume = true;
+        }
+
+        return 0;
+}
+
+static int process_resume(void) {
+        _cleanup_free_ char *service_unit = NULL, *device_unit = NULL, *lnk = NULL;
+        int r;
+
+        if (!arg_resume_device)
+                return 0;
+
+        r = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_device, ".service",
+                                         &service_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to generate unit name: %m");
+
+        lnk = strjoin(arg_dest, "/" SPECIAL_SYSINIT_TARGET ".wants/", service_unit);
+        if (!lnk)
+                return log_oom();
+
+        (void) mkdir_parents_label(lnk, 0755);
+        if (symlink(SYSTEM_DATA_UNIT_DIR "/systemd-hibernate-resume@.service", lnk) < 0)
+                return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+        r = unit_name_from_path(arg_resume_device, ".device", &device_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to generate unit name: %m");
+
+        r = write_drop_in(arg_dest, device_unit, 40, "device-timeout",
+                          "# Automatically generated by systemd-hibernate-resume-generator\n\n"
+                          "[Unit]\nJobTimeoutSec=0");
+        if (r < 0)
+                log_warning_errno(r, "Failed to write device timeout drop-in: %m");
+
+        r = generator_write_timeouts(arg_dest,
+                                     arg_resume_device,
+                                     arg_resume_device,
+                                     arg_resume_options ?: arg_root_options,
+                                     NULL);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+        int r = 0;
+
+        arg_dest = ASSERT_PTR(dest);
+
+        /* Don't even consider resuming outside of initrd. */
+        if (!in_initrd()) {
+                log_debug("Not running in an initrd, quitting.");
+                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_notice("Found \"noresume\" on the kernel command line, quitting.");
+                return 0;
+        }
+
+        return process_resume();
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);