From 72db591576e9087a8d087749d5fae1a78a1e3339 Mon Sep 17 00:00:00 2001
From: Pascal Vizeli <pvizeli@syshack.ch>
Date: Mon, 1 Feb 2021 09:46:48 +0100
Subject: [PATCH] Validate build env before using it (#2492)

---
 supervisor/addons/build.py | 8 ++++++++
 supervisor/docker/addon.py | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/supervisor/addons/build.py b/supervisor/addons/build.py
index d0c2ff86b..648bedaec 100644
--- a/supervisor/addons/build.py
+++ b/supervisor/addons/build.py
@@ -48,6 +48,14 @@ class AddonBuild(JsonConfig, CoreSysAttributes):
         """Return additional Docker build arguments."""
         return self._data[ATTR_ARGS]
 
+    @property
+    def is_valid(self) -> bool:
+        """Return true if the build env is valid."""
+        return all(
+            self.addon.path_location.is_dir(),
+            Path(self.addon.path_location, "Dockerfile").is_file(),
+        )
+
     def get_docker_args(self, version: AwesomeVersion):
         """Create a dict with Docker build arguments."""
         args = {
diff --git a/supervisor/docker/addon.py b/supervisor/docker/addon.py
index ee9e63e47..713254f5f 100644
--- a/supervisor/docker/addon.py
+++ b/supervisor/docker/addon.py
@@ -423,6 +423,9 @@ class DockerAddon(DockerInterface):
         Need run inside executor.
         """
         build_env = AddonBuild(self.coresys, self.addon)
+        if not build_env.is_valid:
+            _LOGGER.error("Invalid build envoirement, can't build this add-on!")
+            raise DockerError()
 
         _LOGGER.info("Starting build for %s:%s", self.image, version)
         try: