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// Copyright 2023 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.
//go:build unix
package toolchain
import (
"internal/syscall/unix"
"io/fs"
"os"
"path/filepath"
"syscall"
"cmd/go/internal/gover"
)
// pathDirs returns the directories in the system search path.
func pathDirs() []string {
return filepath.SplitList(os.Getenv("PATH"))
}
// pathVersion returns the Go version implemented by the file
// described by de and info in directory dir.
// The analysis only uses the name itself; it does not run the program.
func pathVersion(dir string, de fs.DirEntry, info fs.FileInfo) (string, bool) {
v := gover.FromToolchain(de.Name())
if v == "" {
return "", false
}
// Mimicking exec.findExecutable here.
// ENOSYS means Eaccess is not available or not implemented.
// EPERM can be returned by Linux containers employing seccomp.
// In both cases, fall back to checking the permission bits.
err := unix.Eaccess(filepath.Join(dir, de.Name()), unix.X_OK)
if (err == syscall.ENOSYS || err == syscall.EPERM) && info.Mode()&0111 != 0 {
err = nil
}
if err != nil {
return "", false
}
return v, true
}
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