A simple concatenated image class.

1 files changed, 38 insertions, 0 deletions

diff --git a/classes/concatenated-image.bbclass b/classes/concatenated-image.bbclass
new file mode 100644
index 0000000000..5cf8d33c05
--- /dev/null
+++ b/classes/concatenated-image.bbclass
@@ -0,0 +1,38 @@
+
+#
+# define the FLASH_KERNEL_SIZE and FLASH_ROOT_SIZE in your machine.conf,
+# and this class builds a simple, padded concatenated image of 
+# <kernel><padding><rootfs> and performs error checking that either
+# kernel or rootfs isn't too large to fit.
+#
+concat_pack_image() {
+	# find latest kernel - is there a more general way to do this?
+        KERNEL=`ls -tr ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}* | tail -n 1`
+	if [ -z "$KERNEL" ]; then
+		oefatal "No kernel found in ${DEPLOY_DIR_IMAGE}.  Was expecting a ${KERNEL_IMAGETYPE}\* file."
+		exit 1
+	fi
+	ROOTFS=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.jffs2
+	OUTPUT=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.flash.img
+	PADFILE=${DEPLOY_DIR_IMAGE}/padfile.zzz
+	KERNEL_SIZE_MAX_DEC=`echo ${FLASH_KERNEL_SIZE} | awk --non-decimal-data '{printf "%d\n", $1}' `
+	ROOT_SIZE_MAX_DEC=`echo ${FLASH_ROOT_SIZE} | awk --non-decimal-data '{printf "%d\n", $1}' `
+	KERNEL_SIZE=`ls -l $KERNEL | awk '{print $5}'`
+	if [ $KERNEL_SIZE -gt $KERNEL_SIZE_MAX_DEC ]; then
+		oefatal "Kernel too large at $KERNEL_SIZE bytes.  Max is $KERNEL_SIZE_MAX_DEC."
+		exit 1
+	fi
+	ROOT_SIZE=`ls -l $ROOTFS | awk '{print $5}'`
+	if [ $ROOT_SIZE -gt $ROOT_SIZE_MAX_DEC ]; then
+		oefatal "Rootfs is too large at $ROOT_SIZE bytes.  Max is $ROOT_SIZE_MAX_DEC."
+		exit 1
+	fi
+	PAD_SIZE=`echo "$KERNEL_SIZE_MAX_DEC - $KERNEL_SIZE" | bc `
+	dd if=/dev/zero of=$PADFILE bs=$PAD_SIZE count=1 2>>/dev/null
+	cat $KERNEL $PADFILE $ROOTFS > $OUTPUT
+	rm -f $PADFILE
+	ls -l $OUTPUT
+}
+
+IMAGE_POSTPROCESS_COMMAND += "concat_pack_image; "
+