component/all: Machine downloads of unit resources

Menno Smits · Menno Smits · commit 7c0b64235557 · 2016-12-12T11:27:12.000+13:00
For model migrations, machine agents (specifically the migrationmaster
worker) needs to be able to download unit resources.
diff --git a/component/all/resource.go b/component/all/resource.go
@@ -210,7 +210,9 @@ func (r resources) registerHookContextFacade() {
 func (r resources) registerUnitDownloadEndpoint() {
 	common.RegisterAPIModelEndpoint(privateapi.HTTPEndpointPattern, apihttp.HandlerSpec{
 		Constraints: apihttp.HandlerConstraints{
-			AuthKinds:           []string{names.UnitTagKind},
+			// Machines are allowed too so that unit resources can be
+			// retrieved for model migrations.
+			AuthKinds:           []string{names.UnitTagKind, names.MachineTagKind},
 			StrictValidation:    true,
 			ControllerModelOnly: false,
 		},
