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// Copyright 2018 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 main
import (
"os"
"path/filepath"
"runtime"
)
// Copies of functions from src/cmd/go/internal/cfg/cfg.go for
// finding the GOROOT.
// Keep them in sync until support is moved to a common place, if ever.
func findGOROOT() string {
if env := os.Getenv("GOROOT"); env != "" {
return filepath.Clean(env)
}
def := filepath.Clean(runtime.GOROOT())
if runtime.Compiler == "gccgo" {
// gccgo has no real GOROOT, and it certainly doesn't
// depend on the executable's location.
return def
}
exe, err := os.Executable()
if err == nil {
exe, err = filepath.Abs(exe)
if err == nil {
if dir := filepath.Join(exe, "../.."); isGOROOT(dir) {
// If def (runtime.GOROOT()) and dir are the same
// directory, prefer the spelling used in def.
if isSameDir(def, dir) {
return def
}
return dir
}
exe, err = filepath.EvalSymlinks(exe)
if err == nil {
if dir := filepath.Join(exe, "../.."); isGOROOT(dir) {
if isSameDir(def, dir) {
return def
}
return dir
}
}
}
}
return def
}
// isGOROOT reports whether path looks like a GOROOT.
//
// It does this by looking for the path/pkg/tool directory,
// which is necessary for useful operation of the cmd/go tool,
// and is not typically present in a GOPATH.
func isGOROOT(path string) bool {
stat, err := os.Stat(filepath.Join(path, "pkg", "tool"))
if err != nil {
return false
}
return stat.IsDir()
}
// isSameDir reports whether dir1 and dir2 are the same directory.
func isSameDir(dir1, dir2 string) bool {
if dir1 == dir2 {
return true
}
info1, err1 := os.Stat(dir1)
info2, err2 := os.Stat(dir2)
return err1 == nil && err2 == nil && os.SameFile(info1, info2)
}
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