Please support custom stores

[Michael Vogt]

I had to validate a snap from a custom store today. When doing this, I got:

$ snapcraft validate custom custom-kernel=3
Getting details for custom-kernel
Snap 'custom-kernel' was not found in the 'stable' channel.

because snapcraft is only looking into the default store.

As a quick hack I added:
diff --git a/snapcraft/storeapi/__init__.py b/snapcraft/storeapi/__init__.py
index c57626e..5a329ba 100644
--- a/snapcraft/storeapi/__init__.py
+++ b/snapcraft/storeapi/__init__.py
@@ -361,6 +361,9 @@ class SnapIndexClient(Client):
         }
         if arch:
             headers['X-Ubuntu-Architecture'] = arch
+ if os.getenv("SNAPCRAFT_UBUNTU_STORE") != "":
+ headers['X-Ubuntu-Store'] = os.getenv("SNAPCRAFT_UBUNTU_STORE")
+

         params = {
             'channel': channel,

and with that I was able to validate my snap:
$ SNAPCRAFT_UBUNTU_STORE=custom-store-name snapcraft validate custom custom-kernel=3

[Celso Providelo (cprov)]

Proposed fix in https://github.com/snapcore/snapcraft/pull/981