Use create_host_file in run -v tests to ensure file availability

Signed-off-by: Joffrey F <joffrey@docker.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/helpers.py b/tests/helpers.py
index 4b422a6a..59efd255 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -1,6 +1,8 @@
 from __future__ import absolute_import
 from __future__ import unicode_literals
 
+import os
+
 from compose.config.config import ConfigDetails
 from compose.config.config import ConfigFile
 from compose.config.config import load
@@ -15,3 +17,30 @@ def build_config_details(contents, working_dir='working_dir', filename='filename
         working_dir,
         [ConfigFile(filename, contents)],
     )
+
+
+def create_host_file(client, filename):
+    dirname = os.path.dirname(filename)
+
+    with open(filename, 'r') as fh:
+        content = fh.read()
+
+    container = client.create_container(
+        'busybox:latest',
+        ['sh', '-c', 'echo -n "{}" > {}'.format(content, filename)],
+        volumes={dirname: {}},
+        host_config=client.create_host_config(
+            binds={dirname: {'bind': dirname, 'ro': False}},
+            network_mode='none',
+        ),
+    )
+    try:
+        client.start(container)
+        exitcode = client.wait(container)
+
+        if exitcode != 0:
+            output = client.logs(container)
+            raise Exception(
+                "Container exited with code {}:\n{}".format(exitcode, output))
+    finally:
+        client.remove_container(container, force=True)