1 files changed, 30 insertions, 0 deletions
diff --git a/src/cmd/go/internal/base/tool.go b/src/cmd/go/internal/base/tool.go
new file mode 100644
index 0000000..202e314
--- /dev/null
+++ b/src/cmd/go/internal/base/tool.go
@@ -0,0 +1,30 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package base
+
+import (
+	"fmt"
+	"go/build"
+	"os"
+	"path/filepath"
+
+	"cmd/go/internal/cfg"
+)
+
+// Tool returns the path to the named tool (for example, "vet").
+// If the tool cannot be found, Tool exits the process.
+func Tool(toolName string) string {
+	toolPath := filepath.Join(build.ToolDir, toolName) + cfg.ToolExeSuffix()
+	if len(cfg.BuildToolexec) > 0 {
+		return toolPath
+	}
+	// Give a nice message if there is no tool with that name.
+	if _, err := os.Stat(toolPath); err != nil {
+		fmt.Fprintf(os.Stderr, "go: no such tool %q\n", toolName)
+		SetExitStatus(2)
+		Exit()
+	}
+	return toolPath
+}