[DistroKit] [PATCH v2 13/14] image-rauc: use ext4 rootfs instead of tar.gz

[Roland Hieber <rhi@pengutronix.de>]

On one hand, the squashfs inside the RAUC bundle already uses
compression, so with a tar.gz inside a squashfs the content is
compressed twice. Also using ext4 makes it possible to use adaptive
updates in the future.

(Yes, the image generated by the image-root-ext recipe is really called
"root.ext2", even if it's an ext4 image.)

Link: https://rauc.readthedocs.io/en/latest/advanced.html#adaptive-updates
Signed-off-by: Roland Hieber <rhi@pengutronix.de>
---
 config/images/rauc.config | 4 ++--
 platforms/image-rauc.in   | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 platforms/image-rauc.in

diff --git a/config/images/rauc.config b/config/images/rauc.config
index e4169cc8cd95..83e074274961 100644
--- a/config/images/rauc.config
+++ b/config/images/rauc.config
@@ -1,6 +1,6 @@
 image @IMAGE@ {
 	rauc {
-		file root.tar.gz { image = "root.tgz" }
+		file root.ext4 { image = "root.ext2" }
 		manifest = "
 			[update]
 			compatible=@RAUC_BUNDLE_COMPATIBLE@
@@ -12,7 +12,7 @@ image @IMAGE@ {
 			format=@RAUC_BUNDLE_FORMAT@
 
 			[image.rootfs]
-			filename=root.tar.gz
+			filename=root.ext4
 			"
 		cert = "@RAUC_CERT@"
 		key = "@RAUC_KEY@"
diff --git a/platforms/image-rauc.in b/platforms/image-rauc.in
new file mode 100644
index 000000000000..df328522a747
--- /dev/null
+++ b/platforms/image-rauc.in
@@ -0,0 +1,6 @@
+## SECTION=image
+
+menuconfig IMAGE_RAUC
+	tristate
+	select IMAGE_ROOT_EXT
+	select IMAGE_ROOT_EXT_EXT4
-- 
2.39.2