linux: use the package infrastructure to download patches
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
mentioned in the Config.in option BR2_LINUX_KERNEL_PATCH. This
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.
[Thomas: adjust comment in the code according to Yann comments.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>