sdcard_image-rpi: Use xzcat if SDIMG_ROOTFS_TYPE is a .xz file

When burning the rootfs partition we use dd if rootfs file is not
compressed and xzcat piped with dd if rootfs file is a .xz file.

[GITHUB #39]

Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>

1 files changed, 8 insertions, 2 deletions

diff --git a/classes/sdcard_image-rpi.bbclass b/classes/sdcard_image-rpi.bbclass
index f4d777e..e3c12d7 100644
--- a/classes/sdcard_image-rpi.bbclass
+++ b/classes/sdcard_image-rpi.bbclass
@@ -20,7 +20,7 @@ BOOTDD_VOLUME_ID ?= "${MACHINE}"
 # Addional space for boot partition
 BOOT_SPACE ?= "20MiB"
 
-# Use an ext3 by default as rootfs
+# Use an uncompressed ext3 by default as rootfs
 SDIMG_ROOTFS_TYPE ?= "ext3"
 SDIMG_ROOTFS = "${IMAGE_NAME}.rootfs.${SDIMG_ROOTFS_TYPE}"
 
@@ -93,5 +93,11 @@ IMAGE_CMD_rpi-sdimg () {
 
         # Burn Partitions
         dd if=${WORKDIR}/boot.img of=${SDIMG} conv=notrunc seek=1 bs=1M && sync && sync
-        dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=${BOOT_SPACE} && sync && sync
+        # If SDIMG_ROOTFS_TYPE is a .xz file use xzcat
+        if [[ "$SDIMG_ROOTFS_TYPE" == *.xz ]]
+        then
+                xzcat ${SDIMG_ROOTFS} | dd of=${SDIMG} conv=notrunc seek=1 bs=${BOOT_SPACE} && sync && sync
+        else
+                dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=${BOOT_SPACE} && sync && sync
+        fi
 }