hibernate-resume: add resumeflags= kernel option

Adds the resumeflags= kernel command line option to allow setting a
custom device timeout for the resume device (defaults to the same as the
root device).

man/kernel-command-line.xml

@@ -402,10 +402,11 @@
 
       <varlistentry>
         <term><varname>resume=</varname></term>
+        <term><varname>resumeflags=</varname></term>
 
         <listitem>
           <para>Enables resume from hibernation using the specified
-          device. All
+          device and mount options. All
           <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>-like
           paths are supported. For details, see
           <citerefentry><refentrytitle>systemd-hibernate-resume-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>

man/systemd-hibernate-resume-generator.xml

@@ -55,6 +55,13 @@
         supported.</para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><varname>resumeflags=</varname></term>
+
+        <listitem><para>Takes the resume device mount options to
+        use. Defaults <varname>rootflags=</varname> if not specified.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><varname>noresume</varname></term>
 

src/hibernate-resume/hibernate-resume-generator.c

@@ -17,10 +17,12 @@
 
 static const char *arg_dest = "/tmp";
 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) {
@@ -37,6 +39,14 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
 
                 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, NULL))
+                        return log_oom();
+
         } else if (streq(key, "rootflags")) {
 
                 if (proc_cmdline_value_missing(key, value))
@@ -59,6 +69,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
 
 static int process_resume(void) {
         _cleanup_free_ char *name = NULL, *lnk = NULL;
+        const char *opts;
         int r;
 
         if (!arg_resume_device)
@@ -76,7 +87,12 @@ static int process_resume(void) {
         if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-hibernate-resume@.service", lnk) < 0)
                 return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
 
-        r = generator_write_timeouts(arg_dest, arg_resume_device, arg_resume_device, arg_root_options, NULL);
+        if (arg_resume_options)
+                opts = arg_resume_options;
+        else
+                opts = arg_root_options;
+
+        r = generator_write_timeouts(arg_dest, arg_resume_device, arg_resume_device, opts, NULL);
         if (r < 0)
                 return r;
 

test/fuzz/fuzz-unit-file/directives.service

@@ -290,6 +290,7 @@ rd.udev.event_timeout=
 rd.udev.exec_delay=
 rd.udev.log_priority=
 resume=
+resumeflags=
 root=
 rootflags=
 rootfstype=