Shaman: allow Manager to determine the final checkout path

The checkout request now responds with the final checkout path. This makes
it possible for the Manager to ensure the checkout is unique.

addon/flamenco/bat/shaman.py

@@ -19,14 +19,14 @@ if TYPE_CHECKING:
     from ..manager import ApiClient as _ApiClient
 
     from ..manager.models import (
+        ShamanCheckoutResult as _ShamanCheckoutResult,
         ShamanRequirementsRequest as _ShamanRequirementsRequest,
-        ShamanRequirementsResponse as _ShamanRequirementsResponse,
         ShamanFileSpec as _ShamanFileSpec,
     )
 else:
     _ApiClient = object
+    _ShamanCheckoutResult = object
     _ShamanRequirementsRequest = object
-    _ShamanRequirementsResponse = object
     _ShamanFileSpec = object
 
 log = logging.getLogger(__name__)
@@ -58,10 +58,14 @@ class Packer(bat_pack.Packer):  # type: ignore
         super().__init__(blendfile, project_root, target, **kwargs)
         self.checkout_path = checkout_path
         self.api_client = api_client
+        self.shaman_transferrer: Optional[Transferrer] = None
 
     # Mypy doesn't understand that bat_transfer.FileTransferer exists.
     def _create_file_transferer(self) -> bat_transfer.FileTransferer:  # type: ignore
-        return Transferrer(self.api_client, self.project, self.checkout_path)
+        self.shaman_transferrer = Transferrer(
+            self.api_client, self.project, self.checkout_path
+        )
+        return self.shaman_transferrer
 
     def _make_target_path(self, target: str) -> PurePath:
         return PurePosixPath("/")
@@ -70,10 +74,11 @@ class Packer(bat_pack.Packer):  # type: ignore
     def output_path(self) -> PurePath:
         """The path of the packed blend file in the target directory."""
         assert self._output_path is not None
+        assert self.shaman_transferrer is not None
 
-        checkout_location = PurePosixPath(self.checkout_path)
+        checkout_root = PurePosixPath(self.shaman_transferrer.checkout_path)
         rel_output = self._output_path.relative_to(self._target_path)
-        out_path: PurePath = checkout_location / rel_output
+        out_path: PurePath = checkout_root / rel_output
         return out_path
 
     def execute(self):
@@ -149,7 +154,10 @@ class Transferrer(bat_transfer.FileTransferer):  # type: ignore
             return
 
         self.log.info("All files uploaded succesfully")
-        self._request_checkout(shaman_file_specs)
+        checkout_result = self._request_checkout(shaman_file_specs)
+
+        # Update our checkout path to match the one received from the Manager.
+        self.checkout_path = checkout_result.checkout_path
 
     def _upload_missing_files(
         self, shaman_file_specs: _ShamanRequirementsRequest
@@ -407,14 +415,16 @@ class Transferrer(bat_transfer.FileTransferer):  # type: ignore
             raise self.AbortUpload("interrupting ongoing upload")
         super().report_transferred(bytes_transferred)
 
-    def _request_checkout(self, shaman_file_specs: _ShamanRequirementsRequest) -> None:
+    def _request_checkout(
+        self, shaman_file_specs: _ShamanRequirementsRequest
+    ) -> Optional[_ShamanCheckoutResult]:
         """Ask the Shaman to create a checkout of this BAT pack."""
 
         if not self.checkout_path:
             self.log.warning("NOT requesting checkout at Shaman")
-            return
+            return None
 
-        from ..manager.models import ShamanCheckout
+        from ..manager.models import ShamanCheckout, ShamanCheckoutResult
         from ..manager.exceptions import ApiException
 
         self.log.info(
@@ -427,7 +437,9 @@ class Transferrer(bat_transfer.FileTransferer):  # type: ignore
         )
 
         try:
-            self.shaman_api.shaman_checkout(checkoutRequest)
+            result: ShamanCheckoutResult = self.shaman_api.shaman_checkout(
+                checkoutRequest
+            )
         except ApiException as ex:
             match ex.status:
                 case 424:  # Files were missing
@@ -444,9 +456,10 @@ class Transferrer(bat_transfer.FileTransferer):  # type: ignore
                     )
             self.log.error(msg)
             self.error_set(msg)
-            return
+            return None
 
-        self.log.info("Shaman created checkout at %s", self.checkout_path)
+        self.log.info("Shaman created checkout at %s", result.checkout_path)
+        return result
 
 
 def make_file_spec_hashable(spec: _ShamanFileSpec) -> HashableShamanFileSpec:

addon/flamenco/manager/__init__.py

@@ -10,7 +10,7 @@
 """
 
 
-__version__ = "8a97cf50-dirty"
+__version__ = "f66594b0-dirty"
 
 # import ApiClient
 from flamenco.manager.api_client import ApiClient

addon/flamenco/manager/api/shaman_api.py

@@ -23,6 +23,7 @@ from flamenco.manager.model_utils import (  # noqa: F401
 )
 from flamenco.manager.model.error import Error
 from flamenco.manager.model.shaman_checkout import ShamanCheckout
+from flamenco.manager.model.shaman_checkout_result import ShamanCheckoutResult
 from flamenco.manager.model.shaman_requirements_request import ShamanRequirementsRequest
 from flamenco.manager.model.shaman_requirements_response import ShamanRequirementsResponse
 from flamenco.manager.model.shaman_single_file_status import ShamanSingleFileStatus
@@ -41,7 +42,7 @@ class ShamanApi(object):
         self.api_client = api_client
         self.shaman_checkout_endpoint = _Endpoint(
             settings={
-                'response_type': None,
+                'response_type': (ShamanCheckoutResult,),
                 'auth': [],
                 'endpoint_path': '/shaman/checkout/create',
                 'operation_id': 'shaman_checkout',
@@ -312,7 +313,7 @@ class ShamanApi(object):
             async_req (bool): execute request asynchronously
 
         Returns:
-            None
+            ShamanCheckoutResult
                 If the method is called asynchronously, returns the request
                 thread.
         """

addon/flamenco/manager/api_client.py

@@ -76,7 +76,7 @@ class ApiClient(object):
             self.default_headers[header_name] = header_value
         self.cookie = cookie
         # Set default User-Agent.
-        self.user_agent = 'Flamenco/8a97cf50-dirty (Blender add-on)'
+        self.user_agent = 'Flamenco/f66594b0-dirty (Blender add-on)'
 
     def __enter__(self):
         return self

addon/flamenco/manager/configuration.py

@@ -404,7 +404,7 @@ conf = flamenco.manager.Configuration(
                "OS: {env}\n"\
                "Python Version: {pyversion}\n"\
                "Version of the API: 1.0.0\n"\
-               "SDK Package Version: 8a97cf50-dirty".\
+               "SDK Package Version: f66594b0-dirty".\
                format(env=sys.platform, pyversion=sys.version)
 
     def get_host_settings(self):

addon/flamenco/manager/docs/ShamanApi.md

@@ -11,7 +11,7 @@ Method | HTTP request | Description
 
 
 # **shaman_checkout**
-> shaman_checkout(shaman_checkout)
+> ShamanCheckoutResult shaman_checkout(shaman_checkout)
 
 Create a directory, and symlink the required files into it. The files must all have been uploaded to Shaman before calling this endpoint.
 
@@ -24,6 +24,7 @@ import flamenco.manager
 from flamenco.manager.api import shaman_api
 from flamenco.manager.model.error import Error
 from flamenco.manager.model.shaman_checkout import ShamanCheckout
+from flamenco.manager.model.shaman_checkout_result import ShamanCheckoutResult
 from pprint import pprint
 # Defining the host is optional and defaults to http://localhost
 # See configuration.py for a list of all supported configuration parameters.
@@ -50,7 +51,8 @@ with flamenco.manager.ApiClient() as api_client:
     # example passing only required values which don't have defaults set
     try:
         # Create a directory, and symlink the required files into it. The files must all have been uploaded to Shaman before calling this endpoint.
-        api_instance.shaman_checkout(shaman_checkout)
+        api_response = api_instance.shaman_checkout(shaman_checkout)
+        pprint(api_response)
     except flamenco.manager.ApiException as e:
         print("Exception when calling ShamanApi->shaman_checkout: %s\n" % e)
 ```
@@ -64,7 +66,7 @@ Name | Type | Description  | Notes
 
 ### Return type
 
-void (empty response body)
+[**ShamanCheckoutResult**](ShamanCheckoutResult.md)
 
 ### Authorization
 
@@ -80,7 +82,7 @@ No authorization required
 
 | Status code | Description | Response headers |
 |-------------|-------------|------------------|
-**204** | Checkout was created succesfully. |  -  |
+**200** | Checkout was created succesfully. |  -  |
 **424** | There were files missing. Use `shamanCheckoutRequirements` to figure out which ones. |  -  |
 **409** | Checkout already exists. |  -  |
 **0** | unexpected error |  -  |

addon/flamenco/manager/docs/ShamanCheckout.md

@@ -6,7 +6,7 @@ Set of files with their SHA256 checksum, size in bytes, and desired location in
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **files** | [**[ShamanFileSpec]**](ShamanFileSpec.md) |  | 
-**checkout_path** | **str** | Path where the Manager should create this checkout, It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the \"checkout ID\", but in this version it can be a path like `project-slug/scene-name/unique-ID`.  | 
+**checkout_path** | **str** | Path where the Manager should create this checkout. It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the \"checkout ID\", but in this version it can be a path like `project-slug/scene-name/unique-ID`.  | 
 **any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)

addon/flamenco/manager/docs/ShamanCheckoutResult.md

@@ -0,0 +1,13 @@
+# ShamanCheckoutResult
+
+The result of a Shaman checkout.
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**checkout_path** | **str** | Path where the Manager created this checkout. This can be different than what was requested, as the Manager will ensure a unique directory. The path is relative to the Shaman checkout path as configured on the Manager.  | 
+**any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

addon/flamenco/manager/model/shaman_checkout.py

@@ -113,7 +113,7 @@ class ShamanCheckout(ModelNormal):
 
         Args:
             files ([ShamanFileSpec]):
-            checkout_path (str): Path where the Manager should create this checkout, It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the \"checkout ID\", but in this version it can be a path like `project-slug/scene-name/unique-ID`. 
+            checkout_path (str): Path where the Manager should create this checkout. It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the \"checkout ID\", but in this version it can be a path like `project-slug/scene-name/unique-ID`. 
 
         Keyword Args:
             _check_type (bool): if True, values for parameters in openapi_types
@@ -200,7 +200,7 @@ class ShamanCheckout(ModelNormal):
 
         Args:
             files ([ShamanFileSpec]):
-            checkout_path (str): Path where the Manager should create this checkout, It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the \"checkout ID\", but in this version it can be a path like `project-slug/scene-name/unique-ID`. 
+            checkout_path (str): Path where the Manager should create this checkout. It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the \"checkout ID\", but in this version it can be a path like `project-slug/scene-name/unique-ID`. 
 
         Keyword Args:
             _check_type (bool): if True, values for parameters in openapi_types

addon/flamenco/manager/model/shaman_checkout_result.py

@@ -0,0 +1,261 @@
+"""
+    Flamenco manager
+
+    Render Farm manager API  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import re  # noqa: F401
+import sys  # noqa: F401
+
+from flamenco.manager.model_utils import (  # noqa: F401
+    ApiTypeError,
+    ModelComposed,
+    ModelNormal,
+    ModelSimple,
+    cached_property,
+    change_keys_js_to_python,
+    convert_js_args_to_python_args,
+    date,
+    datetime,
+    file_type,
+    none_type,
+    validate_get_composed_info,
+    OpenApiModel
+)
+from flamenco.manager.exceptions import ApiAttributeError
+
+
+
+class ShamanCheckoutResult(ModelNormal):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+
+    Attributes:
+      allowed_values (dict): The key is the tuple path to the attribute
+          and the for var_name this is (var_name,). The value is a dict
+          with a capitalized key describing the allowed value and an allowed
+          value. These dicts store the allowed enum values.
+      attribute_map (dict): The key is attribute name
+          and the value is json key in definition.
+      discriminator_value_class_map (dict): A dict to go from the discriminator
+          variable value to the discriminator class name.
+      validations (dict): The key is the tuple path to the attribute
+          and the for var_name this is (var_name,). The value is a dict
+          that stores validations for max_length, min_length, max_items,
+          min_items, exclusive_maximum, inclusive_maximum, exclusive_minimum,
+          inclusive_minimum, and regex.
+      additional_properties_type (tuple): A tuple of classes accepted
+          as additional properties values.
+    """
+
+    allowed_values = {
+    }
+
+    validations = {
+    }
+
+    @cached_property
+    def additional_properties_type():
+        """
+        This must be a method because a model may have properties that are
+        of type self, this must run after the class is loaded
+        """
+        return (bool, date, datetime, dict, float, int, list, str, none_type,)  # noqa: E501
+
+    _nullable = False
+
+    @cached_property
+    def openapi_types():
+        """
+        This must be a method because a model may have properties that are
+        of type self, this must run after the class is loaded
+
+        Returns
+            openapi_types (dict): The key is attribute name
+                and the value is attribute type.
+        """
+        return {
+            'checkout_path': (str,),  # noqa: E501
+        }
+
+    @cached_property
+    def discriminator():
+        return None
+
+
+    attribute_map = {
+        'checkout_path': 'checkoutPath',  # noqa: E501
+    }
+
+    read_only_vars = {
+    }
+
+    _composed_schemas = {}
+
+    @classmethod
+    @convert_js_args_to_python_args
+    def _from_openapi_data(cls, checkout_path, *args, **kwargs):  # noqa: E501
+        """ShamanCheckoutResult - a model defined in OpenAPI
+
+        Args:
+            checkout_path (str): Path where the Manager created this checkout. This can be different than what was requested, as the Manager will ensure a unique directory. The path is relative to the Shaman checkout path as configured on the Manager. 
+
+        Keyword Args:
+            _check_type (bool): if True, values for parameters in openapi_types
+                                will be type checked and a TypeError will be
+                                raised if the wrong type is input.
+                                Defaults to True
+            _path_to_item (tuple/list): This is a list of keys or values to
+                                drill down to the model in received_data
+                                when deserializing a response
+            _spec_property_naming (bool): True if the variable names in the input data
+                                are serialized names, as specified in the OpenAPI document.
+                                False if the variable names in the input data
+                                are pythonic names, e.g. snake case (default)
+            _configuration (Configuration): the instance to use when
+                                deserializing a file_type parameter.
+                                If passed, type conversion is attempted
+                                If omitted no type conversion is done.
+            _visited_composed_classes (tuple): This stores a tuple of
+                                classes that we have traveled through so that
+                                if we see that class again we will not use its
+                                discriminator again.
+                                When traveling through a discriminator, the
+                                composed schema that is
+                                is traveled through is added to this set.
+                                For example if Animal has a discriminator
+                                petType and we pass in "Dog", and the class Dog
+                                allOf includes Animal, we move through Animal
+                                once using the discriminator, and pick Dog.
+                                Then in Dog, we will make an instance of the
+                                Animal class but this time we won't travel
+                                through its discriminator because we passed in
+                                _visited_composed_classes = (Animal,)
+        """
+
+        _check_type = kwargs.pop('_check_type', True)
+        _spec_property_naming = kwargs.pop('_spec_property_naming', False)
+        _path_to_item = kwargs.pop('_path_to_item', ())
+        _configuration = kwargs.pop('_configuration', None)
+        _visited_composed_classes = kwargs.pop('_visited_composed_classes', ())
+
+        self = super(OpenApiModel, cls).__new__(cls)
+
+        if args:
+            raise ApiTypeError(
+                "Invalid positional arguments=%s passed to %s. Remove those invalid positional arguments." % (
+                    args,
+                    self.__class__.__name__,
+                ),
+                path_to_item=_path_to_item,
+                valid_classes=(self.__class__,),
+            )
+
+        self._data_store = {}
+        self._check_type = _check_type
+        self._spec_property_naming = _spec_property_naming
+        self._path_to_item = _path_to_item
+        self._configuration = _configuration
+        self._visited_composed_classes = _visited_composed_classes + (self.__class__,)
+
+        self.checkout_path = checkout_path
+        for var_name, var_value in kwargs.items():
+            if var_name not in self.attribute_map and \
+                        self._configuration is not None and \
+                        self._configuration.discard_unknown_keys and \
+                        self.additional_properties_type is None:
+                # discard variable.
+                continue
+            setattr(self, var_name, var_value)
+        return self
+
+    required_properties = set([
+        '_data_store',
+        '_check_type',
+        '_spec_property_naming',
+        '_path_to_item',
+        '_configuration',
+        '_visited_composed_classes',
+    ])
+
+    @convert_js_args_to_python_args
+    def __init__(self, checkout_path, *args, **kwargs):  # noqa: E501
+        """ShamanCheckoutResult - a model defined in OpenAPI
+
+        Args:
+            checkout_path (str): Path where the Manager created this checkout. This can be different than what was requested, as the Manager will ensure a unique directory. The path is relative to the Shaman checkout path as configured on the Manager. 
+
+        Keyword Args:
+            _check_type (bool): if True, values for parameters in openapi_types
+                                will be type checked and a TypeError will be
+                                raised if the wrong type is input.
+                                Defaults to True
+            _path_to_item (tuple/list): This is a list of keys or values to
+                                drill down to the model in received_data
+                                when deserializing a response
+            _spec_property_naming (bool): True if the variable names in the input data
+                                are serialized names, as specified in the OpenAPI document.
+                                False if the variable names in the input data
+                                are pythonic names, e.g. snake case (default)
+            _configuration (Configuration): the instance to use when
+                                deserializing a file_type parameter.
+                                If passed, type conversion is attempted
+                                If omitted no type conversion is done.
+            _visited_composed_classes (tuple): This stores a tuple of
+                                classes that we have traveled through so that
+                                if we see that class again we will not use its
+                                discriminator again.
+                                When traveling through a discriminator, the
+                                composed schema that is
+                                is traveled through is added to this set.
+                                For example if Animal has a discriminator
+                                petType and we pass in "Dog", and the class Dog
+                                allOf includes Animal, we move through Animal
+                                once using the discriminator, and pick Dog.
+                                Then in Dog, we will make an instance of the
+                                Animal class but this time we won't travel
+                                through its discriminator because we passed in
+                                _visited_composed_classes = (Animal,)
+        """
+
+        _check_type = kwargs.pop('_check_type', True)
+        _spec_property_naming = kwargs.pop('_spec_property_naming', False)
+        _path_to_item = kwargs.pop('_path_to_item', ())
+        _configuration = kwargs.pop('_configuration', None)
+        _visited_composed_classes = kwargs.pop('_visited_composed_classes', ())
+
+        if args:
+            raise ApiTypeError(
+                "Invalid positional arguments=%s passed to %s. Remove those invalid positional arguments." % (
+                    args,
+                    self.__class__.__name__,
+                ),
+                path_to_item=_path_to_item,
+                valid_classes=(self.__class__,),
+            )
+
+        self._data_store = {}
+        self._check_type = _check_type
+        self._spec_property_naming = _spec_property_naming
+        self._path_to_item = _path_to_item
+        self._configuration = _configuration
+        self._visited_composed_classes = _visited_composed_classes + (self.__class__,)
+
+        self.checkout_path = checkout_path
+        for var_name, var_value in kwargs.items():
+            if var_name not in self.attribute_map and \
+                        self._configuration is not None and \
+                        self._configuration.discard_unknown_keys and \
+                        self.additional_properties_type is None:
+                # discard variable.
+                continue
+            setattr(self, var_name, var_value)
+            if var_name in self.read_only_vars:
+                raise ApiAttributeError(f"`{var_name}` is a read-only attribute. Use `from_openapi_data` to instantiate "
+                                     f"class with read only attributes.")

addon/flamenco/manager/models/__init__.py

@@ -27,6 +27,7 @@ from flamenco.manager.model.manager_configuration import ManagerConfiguration
 from flamenco.manager.model.registered_worker import RegisteredWorker
 from flamenco.manager.model.security_error import SecurityError
 from flamenco.manager.model.shaman_checkout import ShamanCheckout
+from flamenco.manager.model.shaman_checkout_result import ShamanCheckoutResult
 from flamenco.manager.model.shaman_file_spec import ShamanFileSpec
 from flamenco.manager.model.shaman_file_spec_with_status import ShamanFileSpecWithStatus
 from flamenco.manager.model.shaman_file_status import ShamanFileStatus

addon/flamenco/manager_README.md

@@ -4,7 +4,7 @@ Render Farm manager API
 The `flamenco.manager` package is automatically generated by the [OpenAPI Generator](https://openapi-generator.tech) project:
 
 - API version: 1.0.0
-- Package version: 8a97cf50-dirty
+- Package version: f66594b0-dirty
 - Build package: org.openapitools.codegen.languages.PythonClientCodegen
 For more information, please visit [https://flamenco.io/](https://flamenco.io/)
 
@@ -102,6 +102,7 @@ Class | Method | HTTP request | Description
  - [RegisteredWorker](flamenco/manager/docs/RegisteredWorker.md)
  - [SecurityError](flamenco/manager/docs/SecurityError.md)
  - [ShamanCheckout](flamenco/manager/docs/ShamanCheckout.md)
+ - [ShamanCheckoutResult](flamenco/manager/docs/ShamanCheckoutResult.md)
  - [ShamanFileSpec](flamenco/manager/docs/ShamanFileSpec.md)
  - [ShamanFileSpecWithStatus](flamenco/manager/docs/ShamanFileSpecWithStatus.md)
  - [ShamanFileStatus](flamenco/manager/docs/ShamanFileStatus.md)

addon/flamenco/operators.py

@@ -291,9 +291,8 @@ class FLAMENCO_OT_submit_job(FlamencoOpMixin, bpy.types.Operator):
         assert self.job is not None
         self.log.info("Sending BAT pack to Shaman")
 
-        # TODO: get project name from preferences/GUI.
+        # TODO: get project name from preferences/GUI and insert that here too.
-        # TODO: update Shaman API to ensure this is a unique location.
+        checkout_root = PurePosixPath(f"{self.job.name}")
-        checkout_root = PurePosixPath(f"project/{self.job.name}")
 
         self.packthread = bat_interface.copy(
             base_blendfile=blendfile,

internal/manager/api_impl/api_impl.go

@@ -84,7 +84,8 @@ type Shaman interface {
 
 	// Checkout creates a directory, and symlinks the required files into it. The
 	// files must all have been uploaded to Shaman before calling this.
-	Checkout(ctx context.Context, checkout api.ShamanCheckout) error
+	// Returns the final checkout directory, as it may be modified to ensure uniqueness.
+	Checkout(ctx context.Context, checkout api.ShamanCheckout) (string, error)
 
 	// Requirements checks a Shaman Requirements file, and returns the subset
 	// containing the unknown files.

internal/manager/api_impl/mocks/api_impl_mock.gen.go

@@ -412,11 +412,12 @@ func (m *MockShaman) EXPECT() *MockShamanMockRecorder {
 }
 
 // Checkout mocks base method.
-func (m *MockShaman) Checkout(arg0 context.Context, arg1 api.ShamanCheckout) error {
+func (m *MockShaman) Checkout(arg0 context.Context, arg1 api.ShamanCheckout) (string, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Checkout", arg0, arg1)
-	ret0, _ := ret[0].(error)
+	ret0, _ := ret[0].(string)
-	return ret0
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
 // Checkout indicates an expected call of Checkout.

internal/manager/api_impl/shaman.go

@@ -31,14 +31,16 @@ func (f *Flamenco) ShamanCheckout(e echo.Context) error {
 		return sendAPIError(e, http.StatusBadRequest, "invalid format")
 	}
 
-	err = f.shaman.Checkout(e.Request().Context(), api.ShamanCheckout(reqBody))
+	checkoutPath, err := f.shaman.Checkout(e.Request().Context(), api.ShamanCheckout(reqBody))
 	if err != nil {
 		// TODO: return 409 when checkout already exists.
 		logger.Warn().Err(err).Msg("Shaman: creating checkout")
 		return sendAPIError(e, http.StatusInternalServerError, "unexpected error: %v", err)
 	}
 
-	return e.String(http.StatusNoContent, "")
+	return e.JSON(http.StatusOK, api.ShamanCheckoutResult{
+		CheckoutPath: checkoutPath,
+	})
 }
 
 // Checks a Shaman Requirements file, and reports which files are unknown.

pkg/api/flamenco-manager.yaml

@@ -313,8 +313,12 @@ paths:
             schema:
               $ref: "#/components/schemas/ShamanCheckout"
       responses:
-        "204":
+        "200":
           description: Checkout was created succesfully.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ShamanCheckoutResult'
         "424":
           description: There were files missing. Use `shamanCheckoutRequirements` to figure out which ones.
           content:
@@ -795,6 +799,19 @@ components:
             size: 127
             path: logging.go
 
+    ShamanCheckoutResult:
+      type: object
+      description: The result of a Shaman checkout.
+      properties:
+        "checkoutPath":
+          type: string
+          description: >
+            Path where the Manager created this checkout. This can be different
+            than what was requested, as the Manager will ensure a unique
+            directory. The path is relative to the Shaman checkout path as
+            configured on the Manager.
+      required: [checkoutPath]
+
     ShamanFileStatus:
       type: string
       enum: [unknown, uploading, stored]

pkg/api/openapi_client.gen.go

@@ -1397,6 +1397,7 @@ func (r TaskUpdateResponse) StatusCode() int {
 type ShamanCheckoutResponse struct {
 	Body         []byte
 	HTTPResponse *http.Response
+	JSON200      *ShamanCheckoutResult
 	JSON409      *Error
 	JSON424      *Error
 	JSONDefault  *Error
@@ -2054,6 +2055,13 @@ func ParseShamanCheckoutResponse(rsp *http.Response) (*ShamanCheckoutResponse, e
 	}
 
 	switch {
+	case strings.Contains(rsp.Header.Get("Content-Type"), "json") && rsp.StatusCode == 200:
+		var dest ShamanCheckoutResult
+		if err := json.Unmarshal(bodyBytes, &dest); err != nil {
+			return nil, err
+		}
+		response.JSON200 = &dest
+
 	case strings.Contains(rsp.Header.Get("Content-Type"), "json") && rsp.StatusCode == 409:
 		var dest Error
 		if err := json.Unmarshal(bodyBytes, &dest); err != nil {

pkg/api/openapi_spec.gen.go

@@ -18,94 +18,95 @@ import (
 // Base64 encoded, gzipped, json marshaled Swagger object
 var swaggerSpec = []string{
 
-	"H4sIAAAAAAAC/+Q87W4cN5KvQvQekF3cfOnDlq1f57XjREESC5G8OSA2JHZ3zQwtNtkh2RpPDAH7EPcm",
+	"H4sIAAAAAAAC/+Q87W4cN5KvQvQekA1uvvRhy9av09pxIiOJhUjeHBAbEru7eoZSN9kh2RpPDAH7EPcm",
-	"dwvcj9tf9wLeNzoUi/01zZHGieX17vmHMZpmVxXru4rFeZdkuii1AuVscvwusdkSCu4/PrFWLBTk59xe",
+	"dwvcj9tf9wLeNzqwiv01zZHGieR49/zDGHWTxWJ9V7HY76NEFaWSIK2JDt9HJllAwfHnkTFiLiE94+bK",
-	"4d852MyI0gmtkuPeUyYs48zhJ26ZcPi3gQzENeQsXTO3BPajNldgJskoKY0uwTgBHkumi4Kr3H8WDgr/",
+	"/Z2CSbQorVAyOuy9ZcIwzqz7xQ0T1v2tIQFxDSmLV8wugP2o9BXoSTSKSq1K0FYArpKoouAyxd/CQoE/",
-	"4V8MzJPj5HfTlrhpoGz6lF5IbkaJW5eQHCfcGL7Gv9/oFN8OX1tnhFqE7y9KI7QRbt1ZIJSDBZh6BX0b",
+	"/kVDFh1Gf5i2yE09ZtNnNCG6GUV2VUJ0GHGt+cr9faliN9s/NlYLOffPz0stlBZ21RkgpIU56HoEPQ1M",
-	"eV3xIv7gdpjWcVfduR3k3xmtxB1xe7WdkKoSOT6Ya1NwlxzTF6PNhTejxMDPlTCQJ8c/1YuQOWEvDW2d",
+	"l7wIv7gdprHcVndux9HvlEa6HXFztRmRqhKpe5EpXXAbHdKD0frAm1Gk4edKaEijw5/qQY44fi8Nbp0t",
-	"LWxwqcOSLlWjVl6vG7w6fQOZQwKfXHMheSrhG52egXNIzkBzzoRaSGCWnjM9Z5x9o1OG0GxEQZZaZPSx",
+	"rFGpQ5IuVqOWX2+bdVV8CYl1CB5dc5HzOIeXKj4Fax06A8k5FXKeAzP0nqmMcfZSxcxBMwEBWSiR0M8+",
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+	"nB8XINlcXIMcsVwUwqKcXfNcpO7/Cgyzyj0zwDyQCXsl8xWrjMORLYVdMCIaLu7WbkRwQPx1YUsh41Vu",
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-	"1RV3kCOPtMlpg7UcwO+kL7qGrkY2o6FqXMF6SMNJDsqJuQATgDQqP2JFZR3SUynxc0WKGIT2JhhCFA8a",
+	"mBtdcQupo5HSKW2w5gPgTvqsa/BqeDMaisYVrIY4HKcgrcgEaA+kEfkRKypjHT6VFD9XJIieaZdeEYLr",
-	"BjeLiC08UWsGb53hjJtFVaCHqfUtLdcTfNFOznQBp2Rb69//gWUohspCjiszA9wBbTXY37pDQ2virWf5",
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-	"+gdDOA+vXwsrNo3Mmeo2BqHh9k0r6MPLE3KQyKzarAz7vRRXwDj7owSFSszzfKzVHybsDByCu/QCuSQ3",
+	"2aj6R0M489OvhRHrSmZ1dRuBnOL2VcvLw+tjMpCOWLVaafbHXFwB4+xPOUgnxDxNx0p+OWGnYB24C2TI",
-	"Q/GYK/IFissGh1tyh6grmasvvEI2ngpU7h2IjTN6I8SgAYRFO4aFs1ZOG9GhSsf4hNSBDKKWOXtaGQPK",
+	"BZkZ8sdcki2QPG/WsAtu3dJVnsovUCAbSwUyRQNiwoReczFOAfygLd3CacunNe9QxWP3hsSBFKLmOXtW",
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-	"mqASE/a9Zgos+jrrTJW5yoBlv/fhy45YLjJExY0A+wfGDTBblaU2bnPrgfgRZjYH+7hpqblLRl4X7txk",
+	"btsJjReJCfteMQnG2TpjdZXYSoNhf0T3ZUYsFYlbimsB5kvGNTBTlaXSdn3rHvmRi2z2dt2mc8VtNEJZ",
-	"fHd1tG9xUpYoLPuOK74AQyFAOG/6vEAHHUkNJE9BfljKFpi5e7oZS2kG2cCGOQSVIPI6OO+yDeRWxLl/",
+	"uHOT4d3V3r5dk6JEYdh3XPI5aHIBwqLq88IZ6EBokPMY8o8L2Twxtw83QyHNIBpYUwcvEoReZ827dMNR",
-	"K6yrlcFr93a+DXlUp3G/bsfnPY+4ZbstitgG63x9sK3wgBnAKO1DFmeWksOQZXpP9BayysFddcT2JL1R",
+	"K2DcvxXG1sKA0r2ZbkMa1WHcr9vxWc8ibthuu0Rog3W8PtiWf8E0OC+NLoszQ8GhjzLREr2DpLJwVx6x",
-	"oM7jmry44DqvxHb0pTHaILDNSiaHXnZeW8ywNCjAWr6I0btBkIfZro9R81zyAlSm/wTGhmRxR85ct2/c",
+	"OUhvBKjzukYvzLjOlNCOvtJaaQdsPZNJoRed1xozTA0KMIbPQ/iuIYQw2/EhbF7kvACZqD+DNj5Y3JIy",
-	"TkW9MNhVjIpvqPTiUr6YJ8c/3a5hZ3V+iG/djAaM9LlITGPwgc/mRAHW8aJEf1SzO+cOxvgkljqJCLiX",
+	"1+2M27GoB3q9CmHxklIvnuevsujwp9sl7LSOD92sm9GAkBiLhCTGvcBoThRgLC9KZ49qcqfcwti9CYVO",
-	"L0+e1WHmG18d3VFY7VrToatoSrqqzD/ybjak4ymtedbia4h9ffOaBPQdOJ5zx72g8tynXVye9ng/2PFG",
+	"IgDu9evj57WbeYnZ0R2J1bY5nTMVTUpXlek972aNO4hpTbN2vQbZtzdviUHfgeUptxwZlaYYdvH8pEf7",
-	"nmlS4Qw3a1YEYCHs2gn7ThtvuKWEt92Yk3GFUavQmP97j1WhlbNLPkkn2SVT2hEf6jT5CnzqCW85wgoK",
+	"wY7X4kwdC6u5XrHCA/Nu10zYd0qj4pY5vOv6nIRL57UK5eJ/tFiV03J2wSfxJLlgUlmiQx0mXwGGnvCO",
-	"7RXtODkrjXDAnhuxWGIUwhxlAgUXEqlepwbUv6UhBGqzqFeQDSRnfgE7c//7P9cgO46tp8hnnRgR5xNl",
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-	"O7TveGKi527FzZasZSe3Q1tqPU+TJVw0DZx+FnBnj+M3NZwaXowapnYbTzUzRklGWb2nMtnkcoczW3YU",
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-	"k/MZZJURbr0lVO8cf28LvKS1T5eQXekq0gfCWkzPvVZb6jW5JQjDzr5+sv/gIcvwRVsVI2bFLz51T9cO",
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-	"45lrjyObY0t2DhyNrzIyvGmPp9N5nZ4JPR2eQv1AUy/PuSlYEVp6T05PklEiRQah6gl4vjr99vpgAH+1",
+	"C8aPVlnmLEHAtpKyYNn51GFN21siAue8CiXUrw1ox3tnbp0Jo8Hs+PmIldyYpdJp/Yq0g/odGbf1UN1R",
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-	"G5+3Sn24elBKsmrnIw3QBZ71FibE9WCcdZpgUecVaZjdqyPrIoqw9/smNNI+d/Bn/1xxL/jzIDdiwoSd",
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-	"++m0euaGY5KKDkNCTvk+HYQEX9IezPR0xQ/lCNVwpfYvYMZSZ1x618al/dj+7Bp6u6nsQFVduFy+Jbxm",
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-	"c22cDRZPkuKm2didmv4EE2FEk/kzhm4J3wfY1gRhlJqOFoiK1t/QrzE4IWVLQsc8PLzpu3qw/mb6zn8j",
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-	"foEbMg5kjt1mJzRnqw08DYq4kSnufG3C/1jSMK2sl96aVw5mWYY/EfULbN77aC4NRLDWHNgFa3uL5vW9",
+	"digkEsB8ry5t8fPSFWxtb+8FdWngL0z4Lw4obY3XeOIU183G7pT0Ixdnu2USPMLoVgj6ANuUw3dq08kF",
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-	"mllbocLdFdF12X7strkPxxXjwq/IIa3oAuwOe3sRCBs/D4Qlt6nlzrW2zhy4sXUGeNH3EE05nwqF9j0s",
+	"UdtJc2VkwHBK1nluFMEwqgAlgUFuEE7boRtCE6UFCbgAnuJRnSfhv49pmfEzLsfP3T7HrxFAFKBh5/5/",
-	"6If5POGwGxfmfmWl7dVrUGfvzx7dtTyoY08RO+fyh3tHUQgmvI5FQMFdtmQpuBUEZQ/s7Ey71CMwYQ6A",
+	"iIZKi7mQPMc1HfwJO858C3Cuui3DzdUaYZtWXiH91RjRNdnY1dtct+OScYEjUogruvK8xd5eecTGLzxi",
-	"CPCX1rQZ+J0mYa512Zc4DyLVGRlxuHN8h9XWFthaTlC80ugMrBdECvhigz9d9+yO0onLrSZ0zFBmlzT9",
+	"0W1iuXUqrxILdmysBl70LURTLYiFdPo9rBcM43law6zdx/uViTyK1yCN3509uWu4F8eeIHaO/fd3DoIQ",
-	"Rd6ly46wk88lAvnIEBps2+MO+177DgV3w4fePufaZCKVa5ZJbamX8fX5+SnLtFLgf/2CHFjdxgmOdy6U",
+	"tJ/ukoCC22TBYrBL8MLuydlppqk7bHybASGAd+KUHtidJmCuZRlTnEeBL7uQEvtb5ndoba2BreZ4wSu1",
-	"sEuwPXkBg7c8c8zyAkIa6bSf/8dXcl1hhkcv2MkrVUv1C39XnKwp6EIKMQmwVOfrraG025dBFG1pMWRL",
+	"SsAgI2JwE5v141VP7yicuNioQofM8eyCmsvIunTJ4XfyuXgg9Ay+frfZ77DvFRZAuB2+RP3MlE5EnK9Y",
-	"aPTgZwqoNAQ7TToHU4OfLeyPIQ3G6oSzIOeT1p/5YZuh6/1Gp/W5qW/g/FyBEWBHnVG70cbk0qQ332Uj",
+	"kitDpZJvzs5OWKKkBPzeCRmwukrkDW8mpDALMD1+AYN3PLHM8AJ8GGkVXi9wU1JVuQiPJpjJG1lz9Qu8",
-	"QJ+cnvSH/brHZrooKhVucKBLH86KNuBD/ykS64l/T05PRh6RV7lW+GFDvsWCf7/RaVPI2g78IK+b1zf/",
+	"oE3a5GUhhhAHWKzS1UZX2i37uCXa1GJIFl9Hcr/JoVKP7TTqnHsNPlTZ73IadO0JayDPJq09w16eoel9",
-	"FwAA//9HZfvdYFcAAA==",
+	"qeL6WBbrQz9XoAWYUaeTb7TWGDXptY+ZANCjk+N+L2H3VE4VRSX9BRFn0oetqA14X94K+Hqi39HJ8QgX",
+	"QpFrme83hCUW9/eliptE1nTge37dvL35vwAAAP//0IX4BlJZAAA=",
 }
 
 // GetSwagger returns the content of the embedded swagger specification file

pkg/api/openapi_types.gen.go

@@ -250,11 +250,17 @@ type SecurityError struct {
 
 // Set of files with their SHA256 checksum, size in bytes, and desired location in the checkout directory.
 type ShamanCheckout struct {
-	// Path where the Manager should create this checkout, It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the "checkout ID", but in this version it can be a path like `project-slug/scene-name/unique-ID`.
+	// Path where the Manager should create this checkout. It is relative to the Shaman checkout path as configured on the Manager. In older versions of the Shaman this was just the "checkout ID", but in this version it can be a path like `project-slug/scene-name/unique-ID`.
 	CheckoutPath string           `json:"checkoutPath"`
 	Files        []ShamanFileSpec `json:"files"`
 }
 
+// The result of a Shaman checkout.
+type ShamanCheckoutResult struct {
+	// Path where the Manager created this checkout. This can be different than what was requested, as the Manager will ensure a unique directory. The path is relative to the Shaman checkout path as configured on the Manager.
+	CheckoutPath string `json:"checkoutPath"`
+}
+
 // Specification of a file in the Shaman storage.
 type ShamanFileSpec struct {
 	// Location of the file in the checkout

pkg/shaman/checkout/checkout.go

@@ -20,7 +20,7 @@ var (
 	validCheckoutRegexp = regexp.MustCompile(`^[^/?*:;{}\\][^?*:;{}\\]*$`)
 )
 
-func (m *Manager) Checkout(ctx context.Context, checkout api.ShamanCheckout) error {
+func (m *Manager) Checkout(ctx context.Context, checkout api.ShamanCheckout) (string, error) {
 	logger := (*zerolog.Ctx(ctx)).With().
 		Str("checkoutPath", checkout.CheckoutPath).Logger()
 	logger.Debug().Msg("shaman: user requested checkout creation")
@@ -28,7 +28,7 @@ func (m *Manager) Checkout(ctx context.Context, checkout api.ShamanCheckout) err
 	// Actually create the checkout.
 	resolvedCheckoutInfo, err := m.PrepareCheckout(checkout.CheckoutPath)
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	// The checkout directory was created, so if anything fails now, it should be erased.
@@ -46,17 +46,17 @@ func (m *Manager) Checkout(ctx context.Context, checkout api.ShamanCheckout) err
 		blobPath, status := m.fileStore.ResolveFile(fileSpec.Sha, int64(fileSpec.Size), filestore.ResolveStoredOnly)
 		if status != filestore.StatusStored {
 			// Caller should upload this file before we can create the checkout.
-			return ErrMissingFiles
+			return "", ErrMissingFiles
 		}
 
 		if err := m.SymlinkToCheckout(blobPath, resolvedCheckoutInfo.absolutePath, fileSpec.Path); err != nil {
-			return fmt.Errorf("symlinking %q to checkout: %w", fileSpec.Path, err)
+			return "", fmt.Errorf("symlinking %q to checkout: %w", fileSpec.Path, err)
 		}
 	}
 
 	checkoutOK = true // Prevent the checkout directory from being erased again.
 	logger.Info().Msg("shaman: checkout created")
-	return nil
+	return resolvedCheckoutInfo.RelativePath, nil
 }
 
 func isValidCheckoutPath(checkoutPath string) bool {

pkg/shaman/checkout/checkout_test.go

@@ -28,13 +28,13 @@ func TestCheckout(t *testing.T) {
 		},
 	}
 
-	err := manager.Checkout(ctx, checkout)
+	actualCheckoutPath, err := manager.Checkout(ctx, checkout)
 	if err != nil {
 		t.Fatalf("fatal error: %v", err)
 	}
 
 	// Check the symlinks of the checkout
-	coPath := path.Join(manager.checkoutBasePath, checkout.CheckoutPath)
+	coPath := path.Join(manager.checkoutBasePath, actualCheckoutPath)
 	assert.FileExists(t, path.Join(coPath, "subdir", "replacer.py"))
 	assert.FileExists(t, path.Join(coPath, "feed.py"))
 	assert.FileExists(t, path.Join(coPath, "httpstuff.py"))

pkg/shaman/checkout/manager.go

@@ -25,6 +25,7 @@ package checkout
 import (
 	"errors"
 	"fmt"
+	"math/rand"
 	"os"
 	"path"
 	"path/filepath"
@@ -43,7 +44,9 @@ type Manager struct {
 	checkoutBasePath string
 	fileStore        *filestore.Store
 
-	wg sync.WaitGroup
+	wg *sync.WaitGroup
+
+	checkoutUniquenessMutex *sync.Mutex
 }
 
 // ResolvedCheckoutInfo contains the result of validating the Checkout ID and parsing it into a final path.
@@ -78,7 +81,7 @@ func NewManager(conf config.Config, fileStore *filestore.Store) *Manager {
 		logger.Error().Err(err).Msg("unable to create checkout directory")
 	}
 
-	return &Manager{conf.CheckoutPath, fileStore, sync.WaitGroup{}}
+	return &Manager{conf.CheckoutPath, fileStore, new(sync.WaitGroup), new(sync.Mutex)}
 }
 
 // Close waits for still-running touch() calls to finish, then returns.
@@ -101,7 +104,17 @@ func (m *Manager) pathForCheckout(requestedCheckoutPath string) (ResolvedCheckou
 // PrepareCheckout creates the root directory for a specific checkout.
 // Returns the path relative to the checkout root directory.
 func (m *Manager) PrepareCheckout(checkoutPath string) (ResolvedCheckoutInfo, error) {
-	checkoutPaths, err := m.pathForCheckout(checkoutPath)
+	// This function checks the filesystem and tries to ensure uniqueness, so it's
+	// important that it doesn't run simultaneously in parallel threads.
+	m.checkoutUniquenessMutex.Lock()
+	defer m.checkoutUniquenessMutex.Unlock()
+
+	var lastErr error
+	// Just try 10 different random tokens. If that still doesn't work, fail.
+	for try := 0; try < 10; try++ {
+		randomisedPath := fmt.Sprintf("%s-%s", checkoutPath, randomisedToken())
+
+		checkoutPaths, err := m.pathForCheckout(randomisedPath)
 		if err != nil {
 			return ResolvedCheckoutInfo{}, err
 		}
@@ -113,27 +126,34 @@ func (m *Manager) PrepareCheckout(checkoutPath string) (ResolvedCheckoutInfo, er
 
 		if stat, err := os.Stat(checkoutPaths.absolutePath); !os.IsNotExist(err) {
 			if err == nil {
+				// No error stat'ing this path, indicating it's an existing checkout.
+				// Just retry another random token.
+				lastErr = ErrCheckoutAlreadyExists
 				if stat.IsDir() {
 					logger.Debug().Msg("shaman: checkout path exists")
 				} else {
-				logger.Error().Msg("shaman: checkout path exists but is not a directory")
+					logger.Warn().Msg("shaman: checkout path exists but is not a directory")
 				}
-			// No error stat'ing this path, indicating it's an existing checkout.
+				continue
-			return ResolvedCheckoutInfo{}, ErrCheckoutAlreadyExists
 			}
-		// If it's any other error, it's really a problem on our side.
+			// If it's any other error, it's really a problem on our side. Don't retry.
 			logger.Error().Err(err).Msg("shaman: unable to stat checkout directory")
 			return ResolvedCheckoutInfo{}, err
 		}
 
 		if err := os.MkdirAll(checkoutPaths.absolutePath, 0777); err != nil {
-		logger.Error().Err(err).Msg("shaman: unable to create checkout directory")
+			lastErr = err
+			logger.Warn().Err(err).Msg("shaman: unable to create checkout directory")
+			continue
 		}
 
 		logger.Info().Str("relPath", checkoutPaths.RelativePath).Msg("shaman: created checkout directory")
 		return checkoutPaths, nil
 	}
 
+	return ResolvedCheckoutInfo{}, lastErr
+}
+
 // EraseCheckout removes the checkout directory structure identified by the ID.
 func (m *Manager) EraseCheckout(checkoutID string) error {
 	checkoutPaths, err := m.pathForCheckout(checkoutID)
@@ -231,3 +251,17 @@ func touchFile(blobPath string) error {
 	logger.Debug().Msg("done touching")
 	return nil
 }
+
+// randomisedToken generates a random 4-character string.
+// It is intended to add to a checkout path, to create some randomness and thus
+// a higher chance of the path not yet existing.
+func randomisedToken() string {
+	var runes = []rune("abcdefghijklmnopqrstuvwxyz0123456789")
+
+	n := 4
+	s := make([]rune, n)
+	for i := range s {
+		s[i] = runes[rand.Intn(len(runes))]
+	}
+	return string(s)
+}

pkg/shaman/server.go

@@ -112,7 +112,7 @@ func (s *Server) IsEnabled() bool {
 
 // Checkout creates a directory, and symlinks the required files into it. The
 // files must all have been uploaded to Shaman before calling this.
-func (s *Server) Checkout(ctx context.Context, checkout api.ShamanCheckout) error {
+func (s *Server) Checkout(ctx context.Context, checkout api.ShamanCheckout) (string, error) {
 	return s.checkoutMan.Checkout(ctx, checkout)
 }