[Angstrom-devel] [PATCH v2 meta-ti] sdcard_image: Helper class to create SD Card images

[Joel A Fernandes]

Tested with 3 different beagleboard image release builds so far

For ideas, referenced Narcissus image builder written by Koen Kooi <k-kooi at ti.com>

Signed-off-by: Joel A Fernandes <joelagnel at ti.com>
---
 classes/sdcard_image.bbclass |   78 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 78 insertions(+), 0 deletions(-)
 create mode 100644 classes/sdcard_image.bbclass

diff --git a/classes/sdcard_image.bbclass b/classes/sdcard_image.bbclass
new file mode 100644
index 0000000..b3885df
--- /dev/null
+++ b/classes/sdcard_image.bbclass
@@ -0,0 +1,78 @@
+inherit image
+
+IMAGE_CMD_sdimg () {
+	SDIMG=${WORKDIR}/sd.img
+
+	# cleanup loops
+	for loop in $(losetup -j ${SDIMG}); do
+		loop_dev=$(echo $loop|cut -d ":" -f 1)
+		umount $loop_dev || true
+		losetup -d $loop_dev || true
+	done
+
+	dd if=/dev/zero of=${SDIMG} bs=4k seek=$(echo '256 * 1024' | bc) count=1
+	losetup -f ${SDIMG}
+	LOOPDEV=$(losetup -j ${SDIMG} -o 0 | cut -d ":" -f 1)
+
+	# Create partition table
+	dd if=/dev/zero of=${LOOPDEV} bs=1024 count=1024
+	SIZE=`fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}'`
+	CYLINDERS=`echo $SIZE/255/63/512 | bc`
+	{
+	echo ,9,0x0C,*
+	echo ,,,-
+	} | sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
+
+	# Prepare loop devices for boot and filesystem partitions
+	BOOT_OFFSET=32256
+	FS_OFFSET_SECT=$(/sbin/fdisk -l -u $LOOPDEV 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /"|cut -d " " -f 2)
+	FS_OFFSET=$(echo "$FS_OFFSET_SECT * 512" | bc)
+	FS_SIZE_BLOCKS=$(/sbin/fdisk -l -u $LOOPDEV 2>&1 | grep Linux | perl -p -i -e "s/\s+/ /g" \ 
+	|cut -d " " -f 4 | cut -d "+" -f 1)
+ 
+	LOOPDEV_BLOCKS=$(/sbin/fdisk -l -u $LOOPDEV 2>&1 | grep FAT | perl -p -i -e "s/\s+/ /g"|cut -d " " -f 5)
+	LOOPDEV_BYTES=$(echo "$LOOPDEV_BLOCKS * 1024" | bc)
+
+	losetup -f ${SDIMG} -o ${BOOT_OFFSET} --sizelimit=$LOOPDEV_BYTES
+
+	LOOPDEV_BOOT=$(losetup -j ${SDIMG} -o ${BOOT_OFFSET} | cut -d ":" -f 1)
+        mkfs.msdos ${LOOPDEV_BOOT} -n boot
+
+	losetup -f ${SDIMG} -o ${FS_OFFSET}	
+	LOOPDEV_FS=$(losetup -j ${SDIMG} -o ${FS_OFFSET} | cut -d ":" -f 1)
+
+	# Prepare filesystem partition
+	# Copy ubi used by flashing scripts
+	if [ -e  ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ] ; then
+		echo "Copying UBIFS image to file system"
+		cp ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ubi ${IMAGE_ROOTFS}/boot/fs.ubi
+	fi
+	ROOTFS_SIZE="$(du -ks ${IMAGE_ROOTFS} | awk '{print 65536 + $1}')"
+	genext2fs -b ${FS_SIZE_BLOCKS} -d ${IMAGE_ROOTFS} ${LOOPDEV_FS}
+	tune2fs -j ${LOOPDEV_FS}
+
+	# Prepare boot partion. First mount the boot partition, and copy the boot loader and supporting files
+	# from the root filesystem
+
+	# sanity check fstab entry for boot partition mounting
+	if [ "x$(cat /etc/fstab | grep $LOOPDEV_BOOT | grep ${WORKDIR}/tmp-mnt-boot | grep user || true)" = "x" ]; then
+		echo "/etc/fstab entries need to be created with the user flag for $LOOPDEV_BOOT like:"
+		echo "$LOOPDEV_BOOT ${WORKDIR}/tmp-mnt-boot msdos user 0 0"
+		false
+	fi
+
+	mkdir -p ${WORKDIR}/tmp-mnt-boot
+	mount $LOOPDEV_BOOT
+
+	echo "Copying bootloaders into the boot partition"
+	cp -v ${IMAGE_ROOTFS}/boot/MLO ${WORKDIR}/tmp-mnt-boot 
+	cp -v ${IMAGE_ROOTFS}/boot/{u-boot.bin,user.txt,uEnv.txt} ${WORKDIR}/tmp-mnt-boot || true
+
+	# cleanup
+	umount ${LOOPDEV_BOOT}
+	/sbin/losetup -d ${LOOPDEV}
+	/sbin/losetup -d ${LOOPDEV_BOOT}
+	/sbin/losetup -d ${LOOPDEV_FS}
+
+	gzip -c ${WORKDIR}/sd.img > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}-${PR}.img.gz
+}
-- 
1.7.0.4