Refactor libpod python varlink bindings

- More pythonic
- Leverage context managers to help with socket leaks
- Add system unittest's
- Add image unittest's
- Add container unittest's
- Add models for system, containers and images, and their collections
- Add helper functions for datetime parsing/formatting
- GetInfo() implemented
- Add support for setuptools
- Update documentation
- Support for Python 3.4-3.6

Signed-off-by: Jhon Honce <jhonce@redhat.com>

Closes: #748
Approved by: baude

contrib/python/test/podman_testcase.py

@@ -0,0 +1,106 @@
+import contextlib
+import functools
+import itertools
+import os
+import subprocess
+import time
+import unittest
+
+from varlink import VarlinkError
+
+MethodNotImplemented = 'org.varlink.service.MethodNotImplemented'
+
+
+class PodmanTestCase(unittest.TestCase):
+    """Hide the sausage making of initializing storage."""
+
+    @classmethod
+    def setUpClass(cls):
+        if hasattr(PodmanTestCase, 'alpine_process'):
+            PodmanTestCase.tearDownClass()
+
+        def run_cmd(*args):
+            cmd = list(itertools.chain(*args))
+            try:
+                pid = subprocess.Popen(
+                    cmd,
+                    close_fds=True,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.PIPE)
+                out, err = pid.communicate()
+            except OSError as e:
+                print('{}: {}({})'.format(cmd, e.strerror, e.returncode))
+            except ValueError as e:
+                print('{}: {}'.format(cmd, e.message))
+                raise
+            else:
+                return out.strip()
+
+        tmpdir = os.environ.get('TMPDIR', '/tmp')
+        podman_args = [
+            '--storage-driver=vfs',
+            '--root={}/crio'.format(tmpdir),
+            '--runroot={}/crio-run'.format(tmpdir),
+            '--cni-config-dir={}/cni/net.d'.format(tmpdir),
+        ]
+
+        run_podman = functools.partial(run_cmd, ['podman'], podman_args)
+
+        id = run_podman(['pull', 'alpine'])
+        setattr(PodmanTestCase, 'alpine_id', id)
+
+        run_podman(['pull', 'busybox'])
+        run_podman(['images'])
+
+        run_cmd(['rm', '-f', '{}/alpine_gold.tar'.format(tmpdir)])
+        run_podman([
+            'save', '--output', '{}/alpine_gold.tar'.format(tmpdir), 'alpine'
+        ])
+
+        PodmanTestCase.alpine_log = open(
+            os.path.join('/tmp/', 'alpine.log'), 'w')
+
+        cmd = ['podman']
+        cmd.extend(podman_args)
+        cmd.extend(['run', '-d', 'alpine', 'sleep', '500'])
+        PodmanTestCase.alpine_process = subprocess.Popen(
+            cmd,
+            stdout=PodmanTestCase.alpine_log,
+            stderr=subprocess.STDOUT,
+        )
+
+        PodmanTestCase.busybox_log = open(
+            os.path.join('/tmp/', 'busybox.log'), 'w')
+
+        cmd = ['podman']
+        cmd.extend(podman_args)
+        cmd.extend(['create', 'busybox'])
+        PodmanTestCase.busybox_process = subprocess.Popen(
+            cmd,
+            stdout=PodmanTestCase.busybox_log,
+            stderr=subprocess.STDOUT,
+        )
+        # give podman time to start ctnr
+        time.sleep(2)
+
+        # Close our handle of file
+        PodmanTestCase.alpine_log.close()
+        PodmanTestCase.busybox_log.close()
+
+    @classmethod
+    def tearDownClass(cls):
+        try:
+            PodmanTestCase.alpine_process.kill()
+            assert 0 == PodmanTestCase.alpine_process.wait(500)
+            delattr(PodmanTestCase, 'alpine_process')
+
+            PodmanTestCase.busybox_process.kill()
+            assert 0 == PodmanTestCase.busybox_process.wait(500)
+        except Exception as e:
+            print('Exception: {}'.format(e))
+            raise
+
+    @contextlib.contextmanager
+    def assertRaisesNotImplemented(self):
+        with self.assertRaisesRegex(VarlinkError, MethodNotImplemented):
+            yield