Add up flag --renew-anon-volumes (shorthand -V)

compose/cli/main.py

@@ -936,7 +936,7 @@ def up(self, options):
  --always-recreate-deps Recreate dependent containers.
  Incompatible with --no-recreate.
  --no-recreate If containers already exist, don't recreate
- them. Incompatible with --force-recreate.
+ them. Incompatible with --force-recreate and -V.
  --no-build Don't build an image, even if it's missing.
  --no-start Don't start the services after creating them.
  --build Build images before starting containers.
@@ -945,8 +945,10 @@ def up(self, options):
  -t, --timeout TIMEOUT Use this timeout in seconds for container
  shutdown when attached or when containers are
  already running. (default: 10)
- --remove-orphans Remove containers for services not
- defined in the Compose file
+ -V, --renew-anon-volumes Recreate anonymous volumes instead of retrieving
+ data from the previous containers.
+ --remove-orphans Remove containers for services not defined
+ in the Compose file.
  --exit-code-from SERVICE Return the exit code of the selected service
  container. Implies --abort-on-container-exit.
  --scale SERVICE=NUM Scale SERVICE to NUM instances. Overrides the
@@ -992,6 +994,7 @@ def up(rebuild):
  start=not no_start,
  always_recreate_deps=always_recreate_deps,
  reset_container_image=rebuild,
+ renew_anonymous_volumes=options.get('--renew-anon-volumes')
  )
 
  try:
@@ -1083,10 +1086,14 @@ def compute_exit_code(exit_value_from, attached_containers, cascade_starter, all
 def convergence_strategy_from_opts(options):
  no_recreate = options['--no-recreate']
  force_recreate = options['--force-recreate']
+ renew_anonymous_volumes = options.get('--renew-anon-volumes')
  if force_recreate and no_recreate:
  raise UserError("--force-recreate and --no-recreate cannot be combined.")
 
- if force_recreate:
+ if no_recreate and renew_anonymous_volumes:
+ raise UserError('--no-recreate and --renew-anon-volumes cannot be combined.')
+
+ if force_recreate or renew_anonymous_volumes:
  return ConvergenceStrategy.always
 
  if no_recreate:

compose/project.py

@@ -445,7 +445,8 @@ def up(self,
  rescale=True,
  start=True,
  always_recreate_deps=False,
- reset_container_image=False):
+ reset_container_image=False,
+ renew_anonymous_volumes=False):
 
  self.initialize()
  if not ignore_orphans:
@@ -474,7 +475,8 @@ def do(service):
  rescale=rescale,
  start=start,
  project_services=scaled_services,
- reset_container_image=reset_container_image
+ reset_container_image=reset_container_image,
+ renew_anonymous_volumes=renew_anonymous_volumes,
  )
 
  def get_deps(service):

compose/service.py

@@ -409,15 +409,16 @@ def create_and_start(service, n):
 
  return containers
 
- def _execute_convergence_recreate(self, containers, scale, timeout, detached, start):
+ def _execute_convergence_recreate(self, containers, scale, timeout, detached, start,
+ renew_anonymous_volumes):
  if scale is not None and len(containers) > scale:
  self._downscale(containers[scale:], timeout)
  containers = containers[:scale]
 
  def recreate(container):
  return self.recreate_container(
  container, timeout=timeout, attach_logs=not detached,
- start_new_container=start
+ start_new_container=start, renew_anonymous_volumes=renew_anonymous_volumes
  )
  containers, errors = parallel_execute(
  containers,
@@ -470,7 +471,7 @@ def stop_and_remove(container):
  def execute_convergence_plan(self, plan, timeout=None, detached=False,
  start=True, scale_override=None,
  rescale=True, project_services=None,
- reset_container_image=False):
+ reset_container_image=False, renew_anonymous_volumes=False):
  (action, containers) = plan
  scale = scale_override if scale_override is not None else self.scale_num
  containers = sorted(containers, key=attrgetter('number'))
@@ -495,7 +496,8 @@ def execute_convergence_plan(self, plan, timeout=None, detached=False,
  for c in containers:
  c.reset_image(img_id)
  return self._execute_convergence_recreate(
- containers, scale, timeout, detached, start
+ containers, scale, timeout, detached, start,
+ renew_anonymous_volumes,
  )
 
  if action == 'start':
@@ -515,7 +517,8 @@ def execute_convergence_plan(self, plan, timeout=None, detached=False,
 
  raise Exception("Invalid action: {}".format(action))
 
- def recreate_container(self, container, timeout=None, attach_logs=False, start_new_container=True):
+ def recreate_container(self, container, timeout=None, attach_logs=False, start_new_container=True,
+ renew_anonymous_volumes=False):
  """Recreate a container.
 
  The original container is renamed to a temporary name so that data
@@ -526,7 +529,7 @@ def recreate_container(self, container, timeout=None, attach_logs=False, start_n
  container.stop(timeout=self.stop_timeout(timeout))
  container.rename_to_tmp_name()
  new_container = self.create_container(
- previous_container=container,
+ previous_container=container if not renew_anonymous_volumes else None,
  number=container.labels.get(LABEL_CONTAINER_NUMBER),
  quiet=True,
  )

tests/integration/service_test.py

@@ -589,6 +589,25 @@ def test_execute_convergence_plan_with_image_declared_volume(self):
  assert [mount['Destination'] for mount in new_container.get('Mounts')] == ['/data']
  assert new_container.get_mount('/data')['Source'] == volume_path
 
+ def test_execute_convergence_plan_with_image_declared_volume_renew(self):
+ service = Service(
+ project='composetest',
+ name='db',
+ client=self.client,
+ build={'context': 'tests/fixtures/dockerfile-with-volume'},
+ )
+
+ old_container = create_and_start_container(service)
+ assert [mount['Destination'] for mount in old_container.get('Mounts')] == ['/data']
+ volume_path = old_container.get_mount('/data')['Source']
+
+ new_container, = service.execute_convergence_plan(
+ ConvergencePlan('recreate', [old_container]), renew_anonymous_volumes=True
+ )
+
+ assert [mount['Destination'] for mount in new_container.get('Mounts')] == ['/data']
+ assert new_container.get_mount('/data')['Source'] != volume_path
+
  def test_execute_convergence_plan_when_image_volume_masks_config(self):
  service = self.create_service(
  'db',
@@ -637,6 +656,64 @@ def test_execute_convergence_plan_when_host_volume_is_removed(self):
  )
  assert new_container.get_mount('/data')['Source'] != host_path
 
+ def test_execute_convergence_plan_anonymous_volume_renew(self):
+ service = self.create_service(
+ 'db',
+ image='busybox',
+ volumes=[VolumeSpec(None, '/data', 'rw')])
+
+ old_container = create_and_start_container(service)
+ assert (
+ [mount['Destination'] for mount in old_container.get('Mounts')] ==
+ ['/data']
+ )
+ volume_path = old_container.get_mount('/data')['Source']
+
+ new_container, = service.execute_convergence_plan(
+ ConvergencePlan('recreate', [old_container]),
+ renew_anonymous_volumes=True
+ )
+
+ assert (
+ [mount['Destination'] for mount in new_container.get('Mounts')] ==
+ ['/data']
+ )
+ assert new_container.get_mount('/data')['Source'] != volume_path
+
+ def test_execute_convergence_plan_anonymous_volume_recreate_then_renew(self):
+ service = self.create_service(
+ 'db',
+ image='busybox',
+ volumes=[VolumeSpec(None, '/data', 'rw')])
+
+ old_container = create_and_start_container(service)
+ assert (
+ [mount['Destination'] for mount in old_container.get('Mounts')] ==
+ ['/data']
+ )
+ volume_path = old_container.get_mount('/data')['Source']
+
+ mid_container, = service.execute_convergence_plan(
+ ConvergencePlan('recreate', [old_container]),
+ )
+
+ assert (
+ [mount['Destination'] for mount in mid_container.get('Mounts')] ==
+ ['/data']
+ )
+ assert mid_container.get_mount('/data')['Source'] == volume_path
+
+ new_container, = service.execute_convergence_plan(
+ ConvergencePlan('recreate', [mid_container]),
+ renew_anonymous_volumes=True
+ )
+
+ assert (
+ [mount['Destination'] for mount in new_container.get('Mounts')] ==
+ ['/data']
+ )
+ assert new_container.get_mount('/data')['Source'] != volume_path
+
  def test_execute_convergence_plan_without_start(self):
  service = self.create_service(
  'db',