Allow setting of the DB sync command path

The magnum-db-manage command is not necessarily located under /usr/bin
if Magnum is installed in e.g. a virtualenv. In cases like this, it is
useful to let the module user specify a different path, such as the bin
directory of a virtualenv.

Change-Id: I0687683558a4a9ed445642b36b2ce7b7075e49f7

manifests/db/sync.pp

@@ -12,16 +12,21 @@
 #   to the magnum-dbsync command.
 #   Defaults to undef
 #
+# [*exec_path*]
+#   (optional) The path  to use for finding the magnum-db-manage binary.
+#   Defaults to /usr/bin
+#
 class magnum::db::sync(
   $user         = 'magnum',
   $extra_params = '--config-file /etc/magnum/magnum.conf',
+  $exec_path    = '/usr/bin',
 ) {
 
   include ::magnum::deps
 
   exec { 'magnum-db-sync':
     command     => "magnum-db-manage ${extra_params} upgrade head",
-    path        => '/usr/bin',
+    path        => $exec_path,
     user        => $user,
     refreshonly => true,
     try_sleep   => 5,

spec/classes/magnum_db_sync_spec.rb

@@ -44,6 +44,30 @@ describe 'magnum::db::sync' do
     }
     end
 
+    describe "overriding exec_path" do
+    let :params do
+      {
+        :exec_path => '/opt/venvs/magnum/bin',
+      }
+    end
+
+    it {
+        is_expected.to contain_exec('magnum-db-sync').with(
+          :command     => 'magnum-db-manage --config-file /etc/magnum/magnum.conf upgrade head',
+          :path        => '/opt/venvs/magnum/bin',
+          :user        => 'magnum',
+          :refreshonly => 'true',
+          :try_sleep   => 5,
+          :tries       => 10,
+          :logoutput   => 'on_failure',
+          :subscribe   => ['Anchor[magnum::install::end]',
+                           'Anchor[magnum::config::end]',
+                           'Anchor[magnum::dbsync::begin]'],
+          :notify      => 'Anchor[magnum::dbsync::end]',
+        )
+    }
+    end
+
   end
 
   on_supported_os({