bitbake: bitbake-selftest: introduce BB_TMPDIR_NOCLEAN

Set this env variable to 'yes' to preserve temporary directories used by
the fetcher tests. Useful for debugging tests.

(Bitbake rev: 04132b261df9def3a0cff14c93c29b26ff906e8b)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-selftest

@@ -41,6 +41,7 @@ ENV_HELP = """\
 Environment variables:
   BB_SKIP_NETTESTS      set to 'yes' in order to skip tests using network
                         connection
+  BB_TMPDIR_NOCLEAN     set to 'yes' to preserve test tmp directories
 """
 
 class main(unittest.main):

bitbake/lib/bb/tests/fetch.py

@@ -360,7 +360,10 @@ class FetcherTest(unittest.TestCase):
 
     def tearDown(self):
         os.chdir(self.origdir)
-        bb.utils.prunedir(self.tempdir)
+        if os.environ.get("BB_TMPDIR_NOCLEAN") == "yes":
+            print("Not cleaning up %s. Please remove manually." % self.tempdir)
+        else:
+            bb.utils.prunedir(self.tempdir)
 
 class MirrorUriTest(FetcherTest):