Merge lp:~cjwatson/launchpad/db-snap-build-channels into lp:launchpad/db-devel

[Colin Watson]

Add Snap.auto_build_channels and SnapBuild.channels.

See https://code.launchpad.net/~cjwatson/launchpad/snap-build-channels/+merge/337360.

[William Grant (wgrant)]

I'm not a fan of the unadorned "channels" name, as a build also has channels that it uploads to. But I can't think of an alternative that isn't horribly long.

review: Approve (db)

[Colin Watson (cjwatson)]

I could go with source_channels, but I think the current name fits with archive, distro_arch_series, and pocket. The "target" attributes are all Snap.store_*, so at least those ones are namespaced.

=== added file 'database/schema/patch-2209-83-1.sql'
--- database/schema/patch-2209-83-1.sql	1970-01-01 00:00:00 +0000
+++ database/schema/patch-2209-83-1.sql	2018-02-08 13:39:59 +0000
@@ -0,0 +1,12 @@
+-- Copyright 2018 Canonical Ltd.  This software is licensed under the
+-- GNU Affero General Public License version 3 (see the file LICENSE).
+
+SET client_min_messages=ERROR;
+
+ALTER TABLE Snap ADD COLUMN auto_build_channels text;
+ALTER TABLE SnapBuild ADD COLUMN channels text;
+
+COMMENT ON COLUMN Snap.auto_build_channels IS 'A dictionary mapping snap names to channels to use when building this snap package.';
+COMMENT ON COLUMN SnapBuild.channels IS 'A dictionary mapping snap names to channels to use for this build.';
+
+INSERT INTO LaunchpadDatabaseRevision VALUES (2209, 83, 1);