tfexec: move optional positional argument to init cmd; as flags prece…

…de positional arguments.

Since the optional positional directory argument must follow all flags, as flags precede positional arguments, we append it to the args list only after all flags have been added.

tfexec/init.go

@@ -157,6 +157,11 @@ func (tf *Terraform) initCmd(ctx context.Context, opts ...InitOption) (*exec.Cmd
 		return nil, err
 	}
 
+	// Optional positional argument; must be last as flags precede positional arguments.
+	if c.dir != "" {
+		args = append(args, c.dir)
+	}
+
 	return tf.buildInitCmd(ctx, c, args)
 }
 
@@ -175,6 +180,11 @@ func (tf *Terraform) initJSONCmd(ctx context.Context, opts ...InitOption) (*exec
 
 	args = append(args, "-json")
 
+	// Optional positional argument; must be last as flags precede positional arguments.
+	if c.dir != "" {
+		args = append(args, c.dir)
+	}
+
 	return tf.buildInitCmd(ctx, c, args)
 }
 
@@ -228,11 +238,6 @@ func (tf *Terraform) buildInitArgs(ctx context.Context, c initConfig) ([]string,
 		}
 	}
 
-	// optional positional argument
-	if c.dir != "" {
-		args = append(args, c.dir)
-	}
-
 	return args, nil
 }