update: fix regression caused by previous temp dir fix

In c26604146a I made a fix to change where
the bitbake code writes out bitbake.lock and other files it creates
during parsing, but didn't adequately test it and it turns out our
call to delete the temp directory races against bitbake deleting
bitbake.lock and bitbake.sock. For now the simplest way to deal with
this is to ignore the errors since we don't care about these files,
we just want the temp dir gone.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

layerindex/update_layer.py

@@ -16,6 +16,7 @@ from datetime import datetime
 import re
 import tempfile
 import shutil
+import errno
 from distutils.version import LooseVersion
 import itertools
 import utils
@@ -39,6 +40,14 @@ class DryRunRollbackException(Exception):
     pass
 
 
+def rm_tempdir_onerror(fn, fullname, exc_info):
+    # Avoid errors when we're racing against bitbake deleting bitbake.lock/bitbake.sock
+    # (and anything else it happens to create in our temporary build directory in future)
+    if isinstance(exc_info[1], OSError) and exc_info[1].errno == errno.ENOENT:
+        pass
+    else:
+        raise
+
 def check_machine_conf(path, subdir_start):
     subpath = path[len(subdir_start):]
     res = conf_re.match(subpath)
@@ -828,7 +837,7 @@ def main():
             logger.debug('Preserving temp directory %s' % tempdir)
         else:
             logger.debug('Deleting temp directory')
-            shutil.rmtree(tempdir)
+            shutil.rmtree(tempdir, onerror=rm_tempdir_onerror)
     sys.exit(0)