check dir exist before create/clone

cmd/world/root/root_test.go

@@ -116,11 +116,17 @@ func TestCreateStartStopRestartPurge(t *testing.T) {
 	// set tea ouput to variable
 	teaOut := &bytes.Buffer{}
 	createCmd := getCreateCmd(teaOut)
-	createCmd.SetArgs([]string{gameDir})
 
+	// checkout the repo
+	sgtDir := gameDir + "/sgt"
+	createCmd.SetArgs([]string{sgtDir})
 	err = createCmd.Execute()
 	assert.NilError(t, err)
 
+	// Change dir
+	err = os.Chdir(sgtDir)
+	assert.NilError(t, err)
+
 	// Start cardinal
 	rootCmd.SetArgs([]string{"cardinal", "start", "--detach", "--editor=false"})
 	err = rootCmd.Execute()
@@ -173,6 +179,9 @@ func TestDev(t *testing.T) {
 	createCmd := getCreateCmd(teaOut)
 	createCmd.SetArgs([]string{gameDir})
 
+	// checkout the repo
+	sgtDir := gameDir + "/sgt"
+	createCmd.SetArgs([]string{sgtDir})
 	err = createCmd.Execute()
 	assert.NilError(t, err)
 

common/teacmd/git.go

@@ -47,6 +47,12 @@ func git(args ...string) (string, error) {
 }
 
 func GitCloneCmd(url string, targetDir string, initMsg string) error {
+	// check targetDir exists
+	if _, err := os.Stat(targetDir); err == nil {
+		return eris.Errorf("Game shard named '%s' already exists in this directory, "+
+			"please change the directory or use another name", targetDir)
+	}
+
 	_, err := git("clone", url, targetDir)
 	if err != nil {
 		return err