[linux] Allow arbitrary settings to be applied to Linux devices

Allow arbitrary settings to be specified on the Linux command line.
For example:

    ./bin-x86_64-linux/slirp.linux \
          --net slirp,testserver=qa-test.ipxe.org

This can be useful when using the Linux userspace build to test
embedded scripts, since it allows arbitrary parameters to be passed
directly on the command line.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 37 insertions, 13 deletions

diff --git a/src/drivers/linux/linux.c b/src/drivers/linux/linux.c
index 83546b27e..898f50024 100644
--- a/src/drivers/linux/linux.c
+++ b/src/drivers/linux/linux.c
@@ -130,24 +130,48 @@ struct linux_setting *linux_find_setting(char *name, struct list_head *settings)
 	return result;
 }
 
-void linux_apply_settings(struct list_head *new_settings, struct settings *settings_block)
-{
-	struct linux_setting *setting;
+/**
+ * Apply Linux command-line settings
+ *
+ * @v list		List of command-line settings
+ * @v settings		Settings block
+ */
+void linux_apply_settings ( struct list_head *list,
+			    struct settings *settings ) {
+	struct linux_setting *lsetting;
+	struct settings *ignore;
+	struct setting setting;
 	int rc;
 
-	list_for_each_entry(setting, new_settings, list) {
+	list_for_each_entry ( lsetting, list, list ) {
+
 		/* Skip already applied settings */
-		if (setting->applied)
+		if ( lsetting->applied )
 			continue;
 
-		struct setting *s = find_setting(setting->name);
-		if (s) {
-			rc = storef_setting(settings_block, find_setting(setting->name), setting->value);
-			if (rc != 0)
-				DBG("linux storing setting '%s' = '%s' failed\n", setting->name, setting->value);
-			setting->applied = 1;
-		} else {
-			DBG("linux unknown setting '%s'\n", setting->name);
+		/* Parse setting name */
+		if ( ( rc = parse_setting_name ( lsetting->name,
+						 find_child_settings, &ignore,
+						 &setting ) ) != 0 ) {
+			DBGC ( settings, "Linux cannot parse %s: %s\n",
+			       lsetting->name, strerror ( rc ) );
+			continue;
+		}
+
+		/* Apply default type if not specified */
+		if ( ! setting.type )
+			setting.type = &setting_type_string;
+
+		/* Store setting */
+		if ( ( rc = storef_setting ( settings, &setting,
+					     lsetting->value ) ) != 0 ) {
+			DBGC ( settings, "Linux cannot set %s=\"%s\": %s\n",
+			       lsetting->name, lsetting->value,
+			       strerror ( rc ) );
+			continue;
 		}
+
+		/* Mark setting as applied */
+		lsetting->applied = 1;
 	}
 }