зеркало из https://github.com/golang/tools.git
72 строки
1.8 KiB
Go
72 строки
1.8 KiB
Go
// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package goroot is a copy of package internal/goroot
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// in the main GO repot. It provides a utility to produce
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// an importcfg and import path to package file map mapping
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// standard library packages to the locations of their export
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// data files.
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package goroot
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import (
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"bytes"
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"fmt"
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"os/exec"
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"strings"
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"sync"
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)
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// Importcfg returns an importcfg file to be passed to the
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// Go compiler that contains the cached paths for the .a files for the
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// standard library.
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func Importcfg() (string, error) {
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var icfg bytes.Buffer
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m, err := PkgfileMap()
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if err != nil {
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return "", err
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}
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fmt.Fprintf(&icfg, "# import config")
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for importPath, export := range m {
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fmt.Fprintf(&icfg, "\npackagefile %s=%s", importPath, export)
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}
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s := icfg.String()
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return s, nil
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}
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var (
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stdlibPkgfileMap map[string]string
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stdlibPkgfileErr error
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once sync.Once
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)
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// PkgfileMap returns a map of package paths to the location on disk
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// of the .a file for the package.
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// The caller must not modify the map.
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func PkgfileMap() (map[string]string, error) {
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once.Do(func() {
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m := make(map[string]string)
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output, err := exec.Command("go", "list", "-export", "-e", "-f", "{{.ImportPath}} {{.Export}}", "std", "cmd").Output()
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if err != nil {
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stdlibPkgfileErr = err
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}
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for _, line := range strings.Split(string(output), "\n") {
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if line == "" {
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continue
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}
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sp := strings.SplitN(line, " ", 2)
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if len(sp) != 2 {
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err = fmt.Errorf("determining pkgfile map: invalid line in go list output: %q", line)
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return
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}
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importPath, export := sp[0], sp[1]
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if export != "" {
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m[importPath] = export
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}
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}
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stdlibPkgfileMap = m
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})
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return stdlibPkgfileMap, stdlibPkgfileErr
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}
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