Make most test cases work on MacOS

When developing on MacOS currently running test cases is only possible
via remote execution on a linux box. With latest master version of
gear it is possible to run zuul test cases also natively on MacOS with
minimal modification. Since bwrap is not available on mac add a small
fake bwrap script that can be linked into the PATH to make test cases
work that use ansible.

Change-Id: I02d7cc30b872c7406cf6641762e1f7b89e99479d

1 files changed, 80 insertions, 0 deletions

diff --git a/tools/fake_bwrap.py b/tools/fake_bwrap.py
new file mode 100755
index 000000000..ed8de7605
--- /dev/null
+++ b/tools/fake_bwrap.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+
+# Copyright 2020 BMW Group
+#
+# 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.
+
+import argparse
+import os
+import subprocess
+
+
+def main():
+    pos_args = {
+        '--dir': 1,
+        '--tmpfs': 1,
+        '--ro-bind': 2,
+        '--bind': 2,
+        '--chdir': 1,
+        '--uid': 1,
+        '--gid': 1,
+        '--file': 2,
+        '--proc': 1,
+        '--dev': 1,
+    }
+    bool_args = [
+        '--unshare-all',
+        '--unshare-user',
+        '--unshare-user-try',
+        '--unshare-ipc',
+        '--unshare-pid',
+        '--unshare-net',
+        '--unshare-uts',
+        '--unshare-cgroup',
+        '--unshare-cgroup-try',
+        '--share-net',
+        '--die-with-parent',
+    ]
+    parser = argparse.ArgumentParser()
+    for arg, nargs in pos_args.items():
+        parser.add_argument(arg, nargs=nargs, action='append')
+    for arg in bool_args:
+        parser.add_argument(arg, action='store_true')
+    parser.add_argument('args', metavar='args', nargs=argparse.REMAINDER,
+                        help='Command')
+
+    args = parser.parse_args()
+
+    for fd, path in args.file:
+        fd = int(fd)
+        if path.startswith('/etc'):
+            # Ignore write requests to /etc
+            continue
+        print('Writing file from %s to %s' % (fd, path))
+        count = 0
+        with open(path, 'wb') as output:
+            data = os.read(fd, 32000)
+            while data:
+                count += len(data)
+                output.write(data)
+                data = os.read(fd, 32000)
+        print('Wrote file (%s bytes)' % count)
+
+    if args.chdir:
+        os.chdir(args.chdir[0][0])
+    result = subprocess.run(args.args, shell=False, check=False)
+    exit(result.returncode)
+
+
+if __name__ == '__main__':
+    main()