[PATCH] build.py: Preserve sigdata files in the stamps directory

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Leaving the sigdata files around can aid debugging and doesn't harm
anything. This is the easiest way to allow this to happen.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/build.py b/bitbake/lib/bb/build.py
index 8ff7fb2..f9f0a65 100644
--- a/bitbake/lib/bb/build.py
+++ b/bitbake/lib/bb/build.py
@@ -29,6 +29,7 @@ import os
 import sys
 import logging
 import shlex
+import glob
 import bb
 import bb.msg
 import bb.process
@@ -504,8 +505,12 @@ def make_stamp(task, d, file_name = None):
     """
     cleanmask = stamp_cleanmask_internal(task, d, file_name)
     for mask in cleanmask:
-        bb.utils.remove(mask)
-
+        # Preserve sigdata files in the stamps directory
+        for name in glob.glob(mask):
+            if name.find("sigdata") != -1:
+                continue
+            os.unlink(name)
+    
     stamp = stamp_internal(task, d, file_name)
     # Remove the file and recreate to force timestamp
     # change on broken NFS filesystems