[OE-core] [PATCH V2 2/2] kernel.bbclass: handles symbolic KERNEL_OUTPUT in bundle_initramfs task

[Ming Liu]

On 11/13/2013 11:14 AM, Ming Liu wrote:
> In many cases, KERNEL_OUTPUT is a symbolic link to the real bootable image,
> but in bundle_initramfs task, it's not considered so that the KERNEL_OUTPUT
> is being renamed/restored as a regular file, this leads it finally point to
> a incorrect target, or even worse, break the bundle_initramfs task for
> KERNEL_OUTPUT is not going to be regenerated in case it is a symbolic link
> to vmlinux.
>
> Signed-off-by: Ming Liu <ming.liu at windriver.com>
> ---
>   meta/classes/kernel.bbclass | 21 ++++++++++++++++++---
>   1 file changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
> index 966066f..ce987a5 100644
> --- a/meta/classes/kernel.bbclass
> +++ b/meta/classes/kernel.bbclass
> @@ -123,13 +123,28 @@ do_bundle_initramfs () {
>   	if [ ! -z "${INITRAMFS_IMAGE}" -a x"${INITRAMFS_IMAGE_BUNDLE}" = x1 ]; then
>   		echo "Creating a kernel image with a bundled initramfs..."
>   		copy_initramfs
> -		if [ -e ${KERNEL_OUTPUT} ] ; then
> +		# Backuping kernel image relies on its type(regular file or symbolic link)
> +		linkpath=""
> +		realpath=""
> +		if [ -h ${KERNEL_OUTPUT} ] ; then
> +			linkpath=`readlink -n ${KERNEL_OUTPUT}`
> +			realpath=`readlink -fn ${KERNEL_OUTPUT}`
> +			mv -f $realpath $realpath.bak
> +		elif [ -f ${KERNEL_OUTPUT} ]; then
>   			mv -f ${KERNEL_OUTPUT} ${KERNEL_OUTPUT}.bak
>   		fi
>   		use_alternate_initrd=CONFIG_INITRAMFS_SOURCE=${B}/usr/${INITRAMFS_IMAGE}-${MACHINE}.cpio
>   		kernel_do_compile
> -		mv -f ${KERNEL_OUTPUT} ${KERNEL_OUTPUT}.initramfs
> -		mv -f ${KERNEL_OUTPUT}.bak ${KERNEL_OUTPUT}
> +		# Restoring kernel image
> +		if [ -n $realpath ]; then
I made a mistake here,  $realpath need to be quoted, otherwise, it will 
break the task while $realpath is empty. So I need send a V3.

//Ming Liu
> +			mv -f $realpath $realpath.initramfs
> +			mv -f $realpath.bak $realpath
> +			cd ${B}/$(dirname ${KERNEL_OUTPUT})
> +			ln -sf $linkpath.initramfs
> +		else
> +			mv -f ${KERNEL_OUTPUT} ${KERNEL_OUTPUT}.initramfs
> +			mv -f ${KERNEL_OUTPUT}.bak ${KERNEL_OUTPUT}
> +		fi
>   		# Update install area
>   		echo "There is kernel image bundled with initramfs: ${B}/${KERNEL_OUTPUT}.initramfs"
>   		install -m 0644 ${B}/${KERNEL_OUTPUT}.initramfs ${D}/boot/${KERNEL_IMAGETYPE}-initramfs-${MACHINE}.bin