schema: allow CLOUD_INIT_SCHEMA_DIR env override for Paths.schema_dir

To allow for building docs locally in the project-dir, get_schema
needs to source ./config/cloud-init-schema*json which is data files
outside of the typical python module paths.

get_schema will prefer CLOUD_INIT_SCHEMA_DIR environment
variable over Paths.schema_dir if provided.

Allow tox.ini to passenv CLOUD_INIT_SCHEMA_DIR into the tox env.

To generate docs from project directory:
 CLOUD_INIT_SCHEMA_DIR=config tox -e doc

To validate schema docs from project directory:
 CLOUD_INIT_SCHEMA_DIR=config PYTHONPATH=. python3 \
     -m cloudinit.cmd.main devel schema --docs all

4 files changed, 16 insertions, 9 deletions

diff --git a/cloudinit/config/cc_apt_pipelining.py b/cloudinit/config/cc_apt_pipelining.py
index 556eb4c4..34b6ac0e 100644
--- a/cloudinit/config/cc_apt_pipelining.py
+++ b/cloudinit/config/cc_apt_pipelining.py
@@ -56,7 +56,6 @@ __doc__ = get_meta_doc(meta)
 
 
 def handle(_name, cfg, _cloud, log, _args):
-    apt_pipe_value = util.get_cfg_option_str(cfg, "apt_pipelining", "os")
     apt_pipe_value = cfg.get("apt_pipelining", "os")
     apt_pipe_value_s = str(apt_pipe_value).lower().strip()
 
diff --git a/cloudinit/config/schema.py b/cloudinit/config/schema.py
index 7e445043..185df518 100644
--- a/cloudinit/config/schema.py
+++ b/cloudinit/config/schema.py
@@ -420,10 +420,17 @@ def _get_property_type(property_dict: dict) -> str:
     jsonschema.
     """
     property_type = property_dict.get("type")
-    if property_type is None and property_dict.get("enum"):
-        property_type = [
-            str(_YAML_MAP.get(k, k)) for k in property_dict["enum"]
-        ]
+    if property_type is None:
+        if property_dict.get("enum"):
+            property_type = [
+                str(_YAML_MAP.get(k, k)) for k in property_dict["enum"]
+            ]
+        elif property_dict.get("oneOf"):
+            property_type = [
+                subschema["type"]
+                for subschema in property_dict.get("oneOf")
+                if subschema.get("type")
+            ]
     if isinstance(property_type, list):
         property_type = "/".join(property_type)
     items = property_dict.get("items", {})
@@ -629,9 +636,8 @@ def load_doc(requested_modules: list) -> str:
 def get_schema() -> dict:
     """Return jsonschema coalesced from all cc_* cloud-config modules."""
     paths = read_cfg_paths()
-    schema_files = glob.glob(
-        os.path.join(paths.schema_dir, "cloud-init-schema-*")
-    )
+    schema_dir = os.environ.get("CLOUD_INIT_SCHEMA_DIR", paths.schema_dir)
+    schema_files = glob.glob(os.path.join(schema_dir, "cloud-init-schema-*"))
     full_schema = None
     if len(schema_files) > 1:
         LOG.warning(
diff --git a/doc/rtd/conf.py b/doc/rtd/conf.py
index d2cb6ae1..bbaa44e3 100644
--- a/doc/rtd/conf.py
+++ b/doc/rtd/conf.py
@@ -18,7 +18,7 @@ sys.path.insert(0, os.path.abspath("."))
 
 # General information about the project.
 project = "cloud-init"
-copyright = "2020, Canonical Ltd."
+copyright = "2022, Canonical Ltd."
 
 # -- General configuration ----------------------------------------------------
 
diff --git a/tox.ini b/tox.ini
index 57d18cdb..9a93eb33 100644
--- a/tox.ini
+++ b/tox.ini
@@ -104,6 +104,8 @@ deps =
 commands =
     {envpython} -m sphinx {posargs:doc/rtd doc/rtd_html}
     doc8 doc/rtd
+passenv=
+    CLOUD_INIT_SCHEMA_DIR
 
 [testenv:tip-flake8]
 commands = {envpython} -m flake8 {posargs:cloudinit/ tests/ tools/ setup.py}