External components: optional configurable path for git source (#6677)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/external_components/__init__.py

@@ -49,7 +49,16 @@ def _process_git_config(config: dict, refresh) -> str:
         password=config.get(CONF_PASSWORD),
     )
 
-    if (repo_dir / "esphome" / "components").is_dir():
+    if path := config.get(CONF_PATH):
+        if (repo_dir / path).is_dir():
+            components_dir = repo_dir / path
+        else:
+            raise cv.Invalid(
+                "Could not find components folder for source. Please check the source contains a '"
+                + path
+                + "' folder"
+            )
+    elif (repo_dir / "esphome" / "components").is_dir():
         components_dir = repo_dir / "esphome" / "components"
     elif (repo_dir / "components").is_dir():
         components_dir = repo_dir / "components"

esphome/config_validation.py

@@ -2124,6 +2124,7 @@ GIT_SCHEMA = Schema(
         Optional(CONF_REF): git_ref,
         Optional(CONF_USERNAME): string,
         Optional(CONF_PASSWORD): string,
+        Optional(CONF_PATH): string,
     }
 )
 LOCAL_SCHEMA = Schema(