From 35fdd97f9aafa04cac1f8ef9b9f8637c944c3032 Mon Sep 17 00:00:00 2001
From: David Wilson <dw@botanicus.net>
Date: Thu, 5 Apr 2018 20:24:11 +0100
Subject: [PATCH] issue #164: utility to print Docker hostname for use from
 shell scripts.

---
 tests/show_docker_hostname.py | 12 ++++++++++++
 tests/testlib.py              | 14 +++++++++-----
 2 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100644 tests/show_docker_hostname.py

diff --git a/tests/show_docker_hostname.py b/tests/show_docker_hostname.py
new file mode 100644
index 00000000..1dc1cb98
--- /dev/null
+++ b/tests/show_docker_hostname.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+
+"""
+For use by the Travis scripts, just print out the hostname of the Docker
+daemon from the environment.
+"""
+
+import docker
+import testlib
+
+docker = docker.from_env(version='auto')
+print testlib.get_docker_host(docker)
diff --git a/tests/testlib.py b/tests/testlib.py
index cac5b1e9..199e8a46 100644
--- a/tests/testlib.py
+++ b/tests/testlib.py
@@ -161,6 +161,14 @@ class TestCase(unittest2.TestCase):
         assert 0, '%r did not raise %r' % (func, exc)
 
 
+def get_docker_host(docker):
+    if docker.api.base_url == 'http+docker://localunixsocket':
+        return 'localhost'
+
+    parsed = urlparse.urlparse(docker.api.base_url)
+    return parsed.netloc.partition(':')[0]
+
+
 class DockerizedSshDaemon(object):
     def __init__(self):
         self.docker = docker.from_env(version='auto')
@@ -177,11 +185,7 @@ class DockerizedSshDaemon(object):
         self.host = self.get_host()
 
     def get_host(self):
-        if self.docker.api.base_url == 'http+docker://localunixsocket':
-            return 'localhost'
-
-        parsed = urlparse.urlparse(self.docker.api.base_url)
-        return parsed.netloc.partition(':')[0]
+        return get_docker_host(self.docker)
 
     def wait_for_sshd(self):
         wait_for_port(self.get_host(), int(self.port), pattern='OpenSSH')