bitbake: build.py: Preserve sigdata files in the stamps directory

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

(Bitbake rev: 1f500149ecd533a6edbeea902c3f1e009c755154)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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 "sigdata" in name:
+                continue
+            os.unlink(name)
+    
     stamp = stamp_internal(task, d, file_name)
     # Remove the file and recreate to force timestamp
     # change on broken NFS filesystems