[PULL v2 45/50] tests/docker: fall back more gracefully when pull fails

["Alex Bennée" <alex.bennee@linaro.org>]

I only spotted this in the small window between my testing with my
registry while waiting for the gitlab PR to go in. As we pre-pull the
registry image we know if that fails there isn't any point attempting
to use the cache. Fall back to the way we used to do it at that point.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200709141327.14631-12-alex.bennee@linaro.org>

diff --git a/tests/docker/docker.py b/tests/docker/docker.py
index 9684f07bde..2d67bbd15a 100755
--- a/tests/docker/docker.py
+++ b/tests/docker/docker.py
@@ -306,13 +306,14 @@ class Docker(object):
         checksum = _text_checksum(_dockerfile_preprocess(dockerfile))
 
         if registry is not None:
-            dockerfile = dockerfile.replace("FROM qemu/",
-                                            "FROM %s/qemu/" %
-                                            (registry))
             # see if we can fetch a cache copy, may fail...
             pull_args = ["pull", "%s/%s" % (registry, tag)]
-            self._do(pull_args, quiet=quiet)
-
+            if self._do(pull_args, quiet=quiet) == 0:
+                dockerfile = dockerfile.replace("FROM qemu/",
+                                                "FROM %s/qemu/" %
+                                                (registry))
+            else:
+                registry = None
 
         tmp_df = tempfile.NamedTemporaryFile(mode="w+t",
                                              encoding='utf-8',
-- 
2.20.1