kernel-yocto: allow kernel-meta repositories to be patched

For testing purposes, it is often easier to patch a fragment
in a kernel-meta repository versus needing to make a copy or
modify the source repository.

We can allow this sort of patching when a patchdir of kernel-meta
is passed (to indicate the nested kernel-meta repository).

Also note that we must patch the meta data before they are
processed/gathered, since migrated copies to the kernel source
directory will be used later.

(From OE-Core rev: 324f9c8181150c23e3ce1ace4c45794cc8894167)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/kernel-yocto.bbclass

@@ -5,12 +5,21 @@ PATCH_GIT_USER_NAME ?= "OpenEmbedded"
 
 # returns local (absolute) path names for all valid patches in the
 # src_uri
-def find_patches(d):
+def find_patches(d,subdir):
     patches = src_patches(d)
     patch_list=[]
     for p in patches:
-        _, _, local, _, _, _ = bb.fetch.decodeurl(p)
+        _, _, local, _, _, parm = bb.fetch.decodeurl(p)
-        patch_list.append(local)
+        # if patchdir has been passed, we won't be able to apply it so skip
+        # the patch for now, and special processing happens later
+        patchdir = ''
+        if "patchdir" in parm:
+            patchdir = parm["patchdir"]
+        if patchdir:
+            if subdir == patchdir:
+                patch_list.append(local)
+        else:
+            patch_list.append(local)
 
     return patch_list
 
@@ -119,8 +128,20 @@ do_kernel_metadata() {
 		fi
 	fi
 
+	# was anyone trying to patch the kernel meta data ?, we need to do
+	# this here, since the scc commands migrate the .cfg fragments to the
+	# kernel source tree, where they'll be used later.
+	check_git_config
+	patches="${@" ".join(find_patches(d,'kernel-meta'))}"
+	for p in $patches; do
+	    (
+		cd ${WORKDIR}/kernel-meta
+		git am -s $p
+	    )
+	done
+
 	sccs_from_src_uri="${@" ".join(find_sccs(d))}"
-	patches="${@" ".join(find_patches(d))}"
+	patches="${@" ".join(find_patches(d,''))}"
 	feat_dirs="${@" ".join(find_kernel_feature_dirs(d))}"
 
 	# a quick check to make sure we don't have duplicate defconfigs