Add command "key rm"

cmd/khepri/cmd_key.go

@@ -54,9 +54,23 @@ func add_key(be backend.Server, key *khepri.Key) error {
 	return nil
 }
 
+func delete_key(be backend.Server, key *khepri.Key, id backend.ID) error {
+	if id.Equal(key.ID()) {
+		return errors.New("refusing to remove key currently used to access repository")
+	}
+
+	err := be.Remove(backend.Key, id)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("removed key %v\n", id)
+	return nil
+}
+
 func commandKey(be backend.Server, key *khepri.Key, args []string) error {
-	if len(args) < 1 {
-		return errors.New("usage: key [list|add]")
+	if len(args) < 1 || (args[0] == "rm" && len(args) != 2) {
+		return errors.New("usage: key [list|add|rm] [ID]")
 	}
 
 	switch args[0] {
@@ -64,6 +78,13 @@ func commandKey(be backend.Server, key *khepri.Key, args []string) error {
 		return list_keys(be, key)
 	case "add":
 		return add_key(be, key)
+	case "rm":
+		id, err := backend.Find(be, backend.Key, args[1])
+		if err != nil {
+			return err
+		}
+
+		return delete_key(be, key, id)
 	}
 
 	return nil