Fix permission on exited container

If a container is exited we quickly start it to fix
the permissions.

Fix https://github.com/GNS3/gns3-gui/issues/2181

gns3server/compute/docker/docker_vm.py

@@ -416,16 +416,30 @@ class DockerVM(BaseNode):
         Because docker run as root we need to fix permission and ownership to allow user to interact
         with it from their filesystem and do operation like file delete
         """
+
+        state = yield from self._get_container_state()
+        if state == "stopped" or state == "exited":
+            # We need to restart it to fix permissions
+            yield from self.manager.query("POST", "containers/{}/start".format(self._cid))
+
         for volume in self._volumes:
             log.debug("Docker container '{name}' [{image}] fix ownership on {path}".format(
                 name=self._name, image=self._image, path=volume))
-            process = yield from asyncio.subprocess.create_subprocess_exec("docker",
-                                                                           "exec",
-                                                                           self._cid,
-                                                                           "/gns3/bin/busybox",
-                                                                           "sh",
-                                                                           "-c",
-                                                                           "(/gns3/bin/busybox find \"{path}\" -depth -print0 | /gns3/bin/busybox xargs -0 /gns3/bin/busybox stat -c '%a:%u:%g:%n' > \"{path}/.gns3_perms\") && /gns3/bin/busybox chmod -R u+rX \"{path}\" && /gns3/bin/busybox chown {uid}:{gid} -R \"{path}\"".format(uid=os.getuid(), gid=os.getgid(), path=volume))
+            process = yield from asyncio.subprocess.create_subprocess_exec(
+                "docker",
+                "exec",
+                self._cid,
+                "/gns3/bin/busybox",
+                "sh",
+                "-c",
+                "("
+                "/gns3/bin/busybox find \"{path}\" -depth -print0"
+                " | /gns3/bin/busybox xargs -0 /gns3/bin/busybox stat -c '%a:%u:%g:%n' > \"{path}/.gns3_perms\""
+                ")"
+                " && /gns3/bin/busybox chmod -R u+rX \"{path}\""
+                " && /gns3/bin/busybox chown {uid}:{gid} -R \"{path}\""
+                .format(uid=os.getuid(), gid=os.getgid(), path=volume),
+            )
             yield from process.wait()
 
     @asyncio.coroutine
@@ -564,13 +578,15 @@ class DockerVM(BaseNode):
             try:
                 state = yield from self._get_container_state()
             except DockerHttp404Error:
-                state = "stopped"
+                self.status = "stopped"
+                return
 
             if state == "paused":
                 yield from self.unpause()
 
-            if state != "stopped":
-                yield from self._fix_permissions()
+            yield from self._fix_permissions()
+            state = yield from self._get_container_state()
+            if state != "stopped" or state != "exited":
                 # t=5 number of seconds to wait before killing the container
                 try:
                     yield from self.manager.query("POST", "containers/{}/stop".format(self._cid), params={"t": 5})

tests/compute/docker/test_docker_vm.py

@@ -934,6 +934,7 @@ def test_create_network_interfaces(vm):
 @pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
 def test_fix_permission(vm, loop):
     vm._volumes = ["/etc"]
+    vm._get_container_state = AsyncioMagicMock(return_value="running")
     process = MagicMock()
     with asyncio_patch("asyncio.subprocess.create_subprocess_exec", return_value=process) as mock_exec:
         loop.run_until_complete(vm._fix_permissions())
@@ -941,6 +942,19 @@ def test_fix_permission(vm, loop):
     assert process.wait.called
 
 
+@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
+def test_fix_permission_not_running(vm, loop):
+    vm._volumes = ["/etc"]
+    vm._get_container_state = AsyncioMagicMock(return_value="stopped")
+    process = MagicMock()
+    with asyncio_patch("gns3server.compute.docker.Docker.query") as mock_start:
+        with asyncio_patch("asyncio.subprocess.create_subprocess_exec", return_value=process) as mock_exec:
+            loop.run_until_complete(vm._fix_permissions())
+    mock_exec.assert_called_with('docker', 'exec', 'e90e34656842', '/gns3/bin/busybox', 'sh', '-c', '(/gns3/bin/busybox find "/etc" -depth -print0 | /gns3/bin/busybox xargs -0 /gns3/bin/busybox stat -c \'%a:%u:%g:%n\' > "/etc/.gns3_perms") && /gns3/bin/busybox chmod -R u+rX "/etc" && /gns3/bin/busybox chown {}:{} -R "/etc"'.format(os.getuid(), os.getgid()))
+    assert mock_start.called
+    assert process.wait.called
+
+
 def test_read_console_output_with_binary_mode(vm, loop):
     class InputStreamMock(object):
         def __init__(self):