[Buildroot] [PATCH 1/7] linux: use the package infrastructure to download patches

[Romain Naour <romain.naour@openwide.fr>]

Hi Thomas,

Le 28/02/2015 19:15, Thomas Petazzoni a ?crit :
> The linux package has a special handling of patches, with quite a bit
> of legacy in it. A problem caused by this special handling is that the
> linux package calls directly the DOWNLOAD_WGET macro, which means that
> the package infrastructure isn't aware of which patches get
> downloaded, and it prevents doing changes inside the package download
> infrastructure.
> 
> This commit changes the handling of patches in the linux package in
> the following way:
> 
>  * The LINUX_PATCHES variable is kept as is: it lists all the patches
>    mentionned in the Config.in option BR2_LINUX_KERNEL_PATCH. This

mentionned -> mentioned

>    option can contain http://, ftp://, https:// URLs, path to local
>    files or local directories.
> 
>    This variable is *not* used by the generic package infrastructure,
>    so it is purely internal to the Linux package.
> 
>  * The LINUX_PATCH variable is now filled in with the list of patches
>    that should be downloaded. It is derived from LINUX_PATCHES by
>    filtering the patches that have http://, ftp:// or https:// in
>    their path. Since <pkg>_PATCH is handled by the package
>    infrastructure, it means that those patches are now automatically
>    downloaded and applied by the package infrastructure.
> 
>  * The LINUX_APPLY_PATCHES hook is renamed to
>    LINUX_APPLY_LOCAL_PATCHES, because it is now only responsible of
>    applying local patches: remote patches are handled by
>    LINUX_PATCH. The implementation of the hook is changed to filter
>    out the patches that have already taken care of by LINUX_PATCH, so
>    that we only iterate through the list of local patches or local
>    patch directories.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---

Reviewed-by: Romain Naour <romain.naour@openwide.fr>

Partially tested with BR2_LINUX_KERNEL_PATCH which point to a directory that
contains all patches for the kernel to be build.

>  linux/linux.mk | 25 +++++++++----------------
>  1 file changed, 9 insertions(+), 16 deletions(-)
> 
> diff --git a/linux/linux.mk b/linux/linux.mk
> index fc90fc5..d591e1e 100644
> --- a/linux/linux.mk
> +++ b/linux/linux.mk
> @@ -40,6 +40,11 @@ endif
>  
>  LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
>  
> +# We really on the generic package infrastructure to download and

really -> rely (as noted by Baruch)

> +# apply remote patches (downloaded from ftp, http or https). For local
> +# patches, we have a custom post-patch hook below.
> +LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
> +
>  LINUX_INSTALL_IMAGES = YES
>  LINUX_DEPENDENCIES += host-kmod host-lzop
>  
> @@ -144,20 +149,9 @@ else
>  LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
>  endif # BR2_LINUX_KERNEL_VMLINUX
>  
> -define LINUX_DOWNLOAD_PATCHES
> -	$(if $(LINUX_PATCHES),
> -		@$(call MESSAGE,"Download additional patches"))
> -	$(foreach patch,$(filter ftp://% http://% https://%,$(LINUX_PATCHES)),\
> -		$(call DOWNLOAD_WGET,$(patch),$(notdir $(patch)))$(sep))
> -endef
> -
> -LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
> -
> -define LINUX_APPLY_PATCHES
> -	for p in $(LINUX_PATCHES) ; do \
> -		if echo $$p | grep -q -E "^ftp://|^http://|^https://" ; then \
> -			$(APPLY_PATCHES) $(@D) $(DL_DIR) `basename $$p` ; \
> -		elif test -d $$p ; then \
> +define LINUX_APPLY_LOCAL_PATCHES
> +	for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
> +		if test -d $$p ; then \
>  			$(APPLY_PATCHES) $(@D) $$p linux-\*.patch ; \
>  		else \
>  			$(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` ; \
> @@ -165,8 +159,7 @@ define LINUX_APPLY_PATCHES
>  	done
>  endef
>  
> -LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
> -
> +LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
>  
>  ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
>  KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
>