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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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