Add type deprecation support.

cdist/config.py

@@ -758,8 +758,19 @@ class Config(object):
                     ("The requirements of the following objects could not be "
                      "resolved:\n%s") % ("\n".join(info_string)))
 
+    def _handle_deprecation(self, cdist_object):
+        cdist_type = cdist_object.cdist_type
+        deprecated = cdist_type.deprecated
+        if deprecated is not None:
+            if deprecated:
+                self.log.warning("Type %s is deprecated: %s", cdist_type.name,
+                                 deprecated)
+            else:
+                self.log.warning("Type %s is deprecated.", cdist_type.name)
+
     def object_prepare(self, cdist_object, transfer_type_explorers=True):
         """Prepare object: Run type explorer + manifest"""
+        self._handle_deprecation(cdist_object)
         self.log.verbose("Preparing object {}".format(cdist_object.name))
         self.log.verbose(
             "Running manifest and explorers for " + cdist_object.name)

cdist/core/cdist_type.py

@@ -133,6 +133,17 @@ class CdistType(object):
            cannot run in parallel."""
         return os.path.isfile(os.path.join(self.absolute_path, "nonparallel"))
 
+    @property
+    def deprecated(self):
+        """Get type deprecation message. If message is None then type
+        is not deprecated."""
+        deprecated_path = os.path.join(self.absolute_path, "deprecated")
+        try:
+            with open(deprecated_path, 'r') as f:
+                return f.read()
+        except FileNotFoundError:
+            return None
+
     @property
     def explorers(self):
         """Return a list of available explorers"""

cdist/test/cdist_type/__init__.py

@@ -123,6 +123,16 @@ class TypeTestCase(test.CdistTestCase):
         cdist_type = core.CdistType(base_path, '__not_nonparallel')
         self.assertFalse(cdist_type.is_nonparallel)
 
+    def test_deprecated(self):
+        base_path = fixtures
+        cdist_type = core.CdistType(base_path, '__deprecated')
+        self.assertIsNotNone(cdist_type.deprecated)
+
+    def test_not_deprecated(self):
+        base_path = fixtures
+        cdist_type = core.CdistType(base_path, '__not_deprecated')
+        self.assertIsNone(cdist_type.deprecated)
+
     def test_install_is_install(self):
         base_path = fixtures
         cdist_type = core.CdistType(base_path, '__install')

docs/changelog

@@ -6,6 +6,7 @@ next:
 	* Type __consul: Add version 1.5.0 (Nico Schottelius)
 	* Type __consul_agent: Add alpine support (Nico Schottelius)
 	* New helper script: cdist-new-type (Steven Armstrong, Darko Poljak)
+	* Core: Add support for deprecated type marker (Darko Poljak)
 
 5.0.2: 2019-05-17
 	* Type __package_apk: Fix @repo handling in explorer (Nico Schottelius)

docs/src/cdist-type.rst

@@ -71,6 +71,31 @@ when using -j option. Example of such a type is __package_dpkg type where dpkg i
 prevents to be run in more than one instance.
 
 
+Deprecated types
+-----------------
+If a type is flagged with 'deprecated' marker then it is considered deprecated.
+Upon it's usage cdist writes warning line. If 'deprecated' marker has content
+then this content is printed as a deprecation messages, e.g.:
+
+.. code-block:: sh
+
+    $ ls -l deprecated 
+    -rw-r--r--  1 darko  darko  71 May 20 18:30 deprecated
+    $ cat deprecated 
+    This type is deprecated. It will be removed in the next minor release.
+    $ echo '__foo foo' | ./bin/cdist config -i - 185.203.112.26
+    WARNING: 185.203.112.26: Type __foo is deprecated: This type is deprecated. It will be removed in the next minor release.
+
+If 'deprecated' marker has no content then general message is printed, e.g.:
+
+.. code-block:: sh
+
+    $ ls -l deprecated 
+    -rw-r--r--  1 darko  darko  0 May 20 18:36 deprecated
+    $ echo '__bar foo' | ./bin/cdist config -i - 185.203.112.26
+    WARNING: 185.203.112.26: Type __bar is deprecated.
+
+
 How to write a new type
 -----------------------
 A type consists of