path_unix.go

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build unix
     6  
     7  package toolchain
     8  
     9  import (
    10  	"internal/syscall/unix"
    11  	"io/fs"
    12  	"os"
    13  	"path/filepath"
    14  	"syscall"
    15  
    16  	"cmd/go/internal/gover"
    17  )
    18  
    19  // pathDirs returns the directories in the system search path.
    20  func pathDirs() []string {
    21  	return filepath.SplitList(os.Getenv("PATH"))
    22  }
    23  
    24  // pathVersion returns the Go version implemented by the file
    25  // described by de and info in directory dir.
    26  // The analysis only uses the name itself; it does not run the program.
    27  func pathVersion(dir string, de fs.DirEntry, info fs.FileInfo) (string, bool) {
    28  	v := gover.FromToolchain(de.Name())
    29  	if v == "" {
    30  		return "", false
    31  	}
    32  
    33  	// Mimicking exec.findExecutable here.
    34  	// ENOSYS means Eaccess is not available or not implemented.
    35  	// EPERM can be returned by Linux containers employing seccomp.
    36  	// In both cases, fall back to checking the permission bits.
    37  	err := unix.Eaccess(filepath.Join(dir, de.Name()), unix.X_OK)
    38  	if (err == syscall.ENOSYS || err == syscall.EPERM) && info.Mode()&0111 != 0 {
    39  		err = nil
    40  	}
    41  	if err != nil {
    42  		return "", false
    43  	}
    44  
    45  	return v, true
    46  }
    47
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