| // 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 |
| } |