mirror of
https://github.com/tailscale/tailscale.git
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91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package main
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import (
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"errors"
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"fmt"
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"io"
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"io/fs"
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"os"
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"path/filepath"
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)
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// makeGoroot constructs a GOROOT-like file structure in outPath,
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// which consists of toolchainRoot except for the `go` binary, which
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// points to gocross.
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//
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// It's useful for integrating with tooling that expects to be handed
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// a GOROOT, like the Goland IDE or depaware.
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func makeGoroot(toolchainRoot, outPath string) error {
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self, err := os.Executable()
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if err != nil {
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return fmt.Errorf("getting gocross's path: %v", err)
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}
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os.RemoveAll(outPath)
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if err := os.MkdirAll(filepath.Join(outPath, "bin"), 0750); err != nil {
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return fmt.Errorf("making %q: %v", outPath, err)
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}
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if err := os.Symlink(self, filepath.Join(outPath, "bin/go")); err != nil {
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return fmt.Errorf("linking gocross into outpath: %v", err)
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}
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if err := linkFarm(toolchainRoot, outPath); err != nil {
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return fmt.Errorf("creating GOROOT link farm: %v", err)
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}
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if err := linkFarm(filepath.Join(toolchainRoot, "bin"), filepath.Join(outPath, "bin")); err != nil {
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return fmt.Errorf("creating GOROOT/bin link farm: %v", err)
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}
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return nil
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}
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func copyFile(src, dst string) error {
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s, err := os.Open(src)
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if err != nil {
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return fmt.Errorf("opening %q: %v", src, err)
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}
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defer s.Close()
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d, err := os.OpenFile(dst, os.O_RDWR|os.O_CREATE, 0755)
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if err != nil {
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return fmt.Errorf("opening %q: %v", dst, err)
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}
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if _, err := io.Copy(d, s); err != nil {
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d.Close()
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return fmt.Errorf("copying %q to %q: %v", src, dst, err)
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}
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if err := d.Close(); err != nil {
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return fmt.Errorf("closing %q: %v", dst, err)
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}
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return nil
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}
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// linkFarm symlinks every entry in srcDir into outDir, unless that
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// directory entry already exists.
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func linkFarm(srcDir, outDir string) error {
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ents, err := os.ReadDir(srcDir)
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if err != nil {
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return fmt.Errorf("reading %q: %v", srcDir, err)
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}
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for _, ent := range ents {
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dst := filepath.Join(outDir, ent.Name())
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_, err := os.Lstat(dst)
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if errors.Is(err, fs.ErrNotExist) {
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if err := os.Symlink(filepath.Join(srcDir, ent.Name()), dst); err != nil {
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return fmt.Errorf("symlinking %q to %q: %v", ent.Name(), outDir, err)
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}
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} else if err != nil {
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return fmt.Errorf("stat-ing %q: %v", dst, err)
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}
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}
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return nil
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}
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