Re: [ptxdist] [PATCH] images: cpio: add xz packing

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

I don't want to extend the old image rules. Take a look at
rules/image-root-cpio-gz.make  / platforms/image-root-cpio-gz.in

Duplicate this for xz. Or you could merge image-root-cpio and
image-root-cpio-gz and add a choice for the compression mode (none/gz/xz).
Unless someone can think of a use-case where both images are needed?

Michael

On Sat, Nov 07, 2015 at 03:34:45PM +0100, Wolfram Sang wrote:
> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
> ---
>  platforms/image_cpio.in    | 10 +++++++++-
>  rules/post/image_cpio.make | 10 ++++++++++
>  2 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/platforms/image_cpio.in b/platforms/image_cpio.in
> index afe8a43..b654bba 100644
> --- a/platforms/image_cpio.in
> +++ b/platforms/image_cpio.in
> @@ -13,4 +13,12 @@ config IMAGE_CPIO_GZ
>  	select IMAGE_CPIO
>  	help
>  	  Build the traditionally initrd RAM disk to be used
> -	  as initramfs by the kernel.
> +	  as initramfs by the kernel, packed with gzip.
> +
> +config IMAGE_CPIO_XZ
> +	bool
> +	prompt "Generate images/root.cpio.xz"
> +	select IMAGE_CPIO
> +	help
> +	  Build the traditionally initrd RAM disk to be used
> +	  as initramfs by the kernel, packed with xz.
> diff --git a/rules/post/image_cpio.make b/rules/post/image_cpio.make
> index 573faee..3f20c4e 100644
> --- a/rules/post/image_cpio.make
> +++ b/rules/post/image_cpio.make
> @@ -31,4 +31,14 @@ $(IMAGEDIR)/root.cpio.gz: $(IMAGEDIR)/root.cpio
>  	@echo "done."
>  endif
>  
> +SEL_ROOTFS-$(PTXCONF_IMAGE_CPIO_XZ) += $(IMAGEDIR)/root.cpio.xz
> +
> +# '--best' is not suitable here. Check xz manpage for details.
> +ifdef PTXCONF_IMAGE_CPIO_XZ
> +$(IMAGEDIR)/root.cpio.xz: $(IMAGEDIR)/root.cpio
> +	@echo -n "Creating '$(notdir $(@))' from '$(notdir $(^))'..."
> +	@cat "$(^)" | xz > "$(@)"
> +	@echo "done."
> +endif
> +
>  # vim: syntax=make
> -- 
> 2.1.4
> 
> 
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