[gnome-continuous-yocto/gnomeostree-3.28-rocko: 3386/8267] lib/oe/patch: fix handling of patches with no header

[Emmanuele Bassi <ebassi src gnome org>]

commit d316363b7ba57cbf5300c6cd3b4cc68fb3258d6f
Author: Paul Eggleton <paul eggleton linux intel com>
Date:   Thu Nov 10 14:45:16 2016 +1300

    lib/oe/patch: fix handling of patches with no header
    
    If a patch applied by a recipe has no header and we turn the recipe's
    source into a git tree (when PATCHTOOL = "git" or when using devtool
    extract / modify / upgrade), the commit message ends up consisting only
    of the original filename marker ("%% original patch: filename.patch").
    When we come to do turn the commits back into a set of patches in
    extractPatches(), this first line ends up in the "Subject: " part of
    the file, but we were ignoring it because the line didn't start with the
    marker text. The end result was we weren't able to get the original
    patch name. Strip off any "Subject [PATCH x/y]" part before looking for
    the marker text to fix.
    
    This caused "devtool modify openssl" followed by "devtool update-recipe
    openssl" (without any changes in-between) to remove version-script.patch
    because that patch has no header and we weren't able to determine the
    original filename.
    
    (From OE-Core rev: d9971f5dc8eb7de551fd6f5e058fd24770ef5d78)
    
    Signed-off-by: Paul Eggleton <paul eggleton linux intel com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/lib/oe/patch.py |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/meta/lib/oe/patch.py b/meta/lib/oe/patch.py
index 0332f10..dbefd28 100644
--- a/meta/lib/oe/patch.py
+++ b/meta/lib/oe/patch.py
@@ -428,6 +428,7 @@ class GitApplyTree(PatchTree):
     def extractPatches(tree, startcommit, outdir, paths=None):
         import tempfile
         import shutil
+        import re
         tempdir = tempfile.mkdtemp(prefix='oepatch')
         try:
             shellcmd = ["git", "format-patch", startcommit, "-o", tempdir]
@@ -443,10 +444,13 @@ class GitApplyTree(PatchTree):
                         try:
                             with open(srcfile, 'r', encoding=encoding) as f:
                                 for line in f:
-                                    if line.startswith(GitApplyTree.patch_line_prefix):
+                                    checkline = line
+                                    if checkline.startswith('Subject: '):
+                                        checkline = re.sub(r'\[.+?\]\s*', '', checkline[9:])
+                                    if checkline.startswith(GitApplyTree.patch_line_prefix):
                                         outfile = line.split()[-1].strip()
                                         continue
-                                    if line.startswith(GitApplyTree.ignore_commit_prefix):
+                                    if checkline.startswith(GitApplyTree.ignore_commit_prefix):
                                         continue
                                     patchlines.append(line)
                         except UnicodeDecodeError: