docker_build: workaround the lack of LZMA in python 2.7

Some debs file actually does use the LZMA compression and reading
that format requires python 3. Backports of LZMA to python 2 are
using native deps which might be hard for the user to setup and
our support of python 3 is not really functional (it needs 2to3
to use gflags for instance). Until we fix Bazel's python 3 support,
we shell out to xzcat for supporting LZMA compressed file.

Also added test for the archive library. These tests shows some
wrong handling in the AR format padding, fixed.

--
MOS_MIGRATED_REVID=100474498

1 files changed, 22 insertions, 0 deletions

diff --git a/tools/build_defs/docker/testenv.py b/tools/build_defs/docker/testenv.py
new file mode 100644
index 0000000000..4e0039e2b6
--- /dev/null
+++ b/tools/build_defs/docker/testenv.py
@@ -0,0 +1,22 @@
+# Copyright 2015 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Path to the test data."""
+
+import os
+import os.path
+
+TESTDATA_PATH = os.path.join(
+    os.getcwd(),
+    "tools/build_defs/docker/testdata",
+    )