Source file src/pkg/cmd/go/internal/base/tool.go

     1	// Copyright 2017 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package base
     6	
     7	import (
     8		"fmt"
     9		"go/build"
    10		"os"
    11		"path/filepath"
    12		"runtime"
    13	
    14		"cmd/go/internal/cfg"
    15	)
    16	
    17	// Configuration for finding tool binaries.
    18	var (
    19		ToolGOOS      = runtime.GOOS
    20		ToolGOARCH    = runtime.GOARCH
    21		ToolIsWindows = ToolGOOS == "windows"
    22		ToolDir       = build.ToolDir
    23	)
    24	
    25	const ToolWindowsExtension = ".exe"
    26	
    27	// Tool returns the path to the named tool (for example, "vet").
    28	// If the tool cannot be found, Tool exits the process.
    29	func Tool(toolName string) string {
    30		toolPath := filepath.Join(ToolDir, toolName)
    31		if ToolIsWindows {
    32			toolPath += ToolWindowsExtension
    33		}
    34		if len(cfg.BuildToolexec) > 0 {
    35			return toolPath
    36		}
    37		// Give a nice message if there is no tool with that name.
    38		if _, err := os.Stat(toolPath); err != nil {
    39			fmt.Fprintf(os.Stderr, "go tool: no such tool %q\n", toolName)
    40			SetExitStatus(2)
    41			Exit()
    42		}
    43		return toolPath
    44	}
    45	

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