Add globalrefdb show-ref command

Change-Id: I0451f9da00e5149ca3b976923cd72f0bc0beca57

multi-primary/globalrefdb.groovy

diff --git a/multi-primary/globalrefdb.groovy b/multi-primary/globalrefdb.groovy
index 7ad1ecf..65f6803 100644
--- a/multi-primary/globalrefdb.groovy
+++ b/multi-primary/globalrefdb.groovy
@@ -174,5 +174,31 @@
   }
 }
 
-commands = [ ProjectRefsCheck, ProjectRefsUpdate ]
+@Export("show-ref")
+@CommandMetaData(description = "Get global-refdb refs values for a project")
+@RequiresCapability(GlobalCapability.ADMINISTRATE_SERVER)
+class ProjectRefsGet extends BaseSshCommand {
+
+  @Argument(index = 0, usage = "Project name", metaVar = "PROJECT", required = true)
+  String project
+
+  @Option(name = "--ref", usage = "Global-refdb ref(s) requested", required = true)
+  ArrayList<String> refs
+
+  @Inject
+  DynamicItem<GlobalRefDatabase> globalRefDb
+
+  public void run() {
+    def projectName = Project.nameKey(project)
+
+    refs.each { ref ->
+      def sha = globalRefDb.get().get(projectName, ref, String.class)
+      if (sha.isPresent()) {
+        println "${sha.get()} ${ref}"
+      }
+    }
+  }
+}
+
+commands = [ ProjectRefsCheck, ProjectRefsUpdate, ProjectRefsGet ]
 

multi-primary/globalrefdb.md

diff --git a/multi-primary/globalrefdb.md b/multi-primary/globalrefdb.md
index 45a5d0f..1ae826c 100644
--- a/multi-primary/globalrefdb.md
+++ b/multi-primary/globalrefdb.md
@@ -13,6 +13,7 @@
 --------
 >     ssh -p <port> <host> globalrefdb check PROJECT [--ref <ref name>] [--verbose]
 >     ssh -p <port> <host> globalrefdb update-ref PROJECT REF-NAME NEW-VALUE
+>     ssh -p <port> <host> globalrefdb show-ref PROJECT [--ref <ref name>]*
 
 DESCRIPTION
 -----------
@@ -27,6 +28,9 @@
 the latest.
 This can happen if the global-refdb finds itself behind other nodes.
 
+## Show-ref
+Shows the global-refdb ref value, when present.
+
 ACCESS
 ------
 Any user who has been granted the 'Administrate Server' capability.