devtool: commit for extra tasks that modify source when extracting

When extracting source for a recipe, if there are additional custom
tasks run that make changes to the source, create a commit in the
generated git branch so they are contained. This is particularly
useful for tasks that come before do_patch since otherwise the changes
might get incorporated in the first applied patch, but otherwise it
helps avoid the tree being dirty at any point.

Fixes [YOCTO #7626].

(From OE-Core rev: 997a77d9b20af1778b804778e5d8c8a7424f7582)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/patch.py

@@ -264,6 +264,7 @@ class PatchTree(PatchSet):
 
 class GitApplyTree(PatchTree):
     patch_line_prefix = '%% original patch'
+    ignore_commit_prefix = '%% ignore'
 
     def __init__(self, dir, d):
         PatchTree.__init__(self, dir, d)
@@ -384,6 +385,8 @@ class GitApplyTree(PatchTree):
                             if line.startswith(GitApplyTree.patch_line_prefix):
                                 outfile = line.split()[-1].strip()
                                 continue
+                            if line.startswith(GitApplyTree.ignore_commit_prefix):
+                                continue
                             patchlines.append(line)
                     if not outfile:
                         outfile = os.path.basename(srcfile)