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// 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"
"cmd/go/internal/par"
)
// 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, err := ToolPath(toolName)
if err != nil && len(cfg.BuildToolexec) == 0 {
// Give a nice message if there is no tool with that name.
fmt.Fprintf(os.Stderr, "go: no such tool %q\n", toolName)
SetExitStatus(2)
Exit()
}
return toolPath
}
// Tool returns the path at which we expect to find the named tool
// (for example, "vet"), and the error (if any) from statting that path.
func ToolPath(toolName string) (string, error) {
toolPath := filepath.Join(build.ToolDir, toolName) + cfg.ToolExeSuffix()
err := toolStatCache.Do(toolPath, func() error {
_, err := os.Stat(toolPath)
return err
})
return toolPath, err
}
var toolStatCache par.Cache[string, error]
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