gentree: refuse patches creating files

This doesn't make sense since we'd have no way of knowing
when such a patch should be applied. Right now the patch
would be ignored, but make it extra obvious and error out
on such patches.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/gentree.py b/gentree.py
index 9d0f3ae5..86b3f3c1 100755
--- a/gentree.py
+++ b/gentree.py
@@ -364,6 +364,9 @@ def process(kerneldir, outdir, copy_list_file, git_revision=None,
         # complain if it's not a patch
         if not p:
             raise Exception('No patch content found in %s' % print_name)
+        # leading / seems to be stripped?
+        if 'dev/null' in p.items[0].source:
+            raise Exception('Patches creating files are not supported (in %s)' % print_name)
         # check if the first file the patch touches exists, if so
         # assume the patch needs to be applied -- otherwise continue
         patched_file = '/'.join(p.items[0].source.split('/')[1:])