golang.org/x/build@v0.0.0-20240506185731-218518f32b70/internal/basedir/basedir.go (about)

     1  // Copyright 2017 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  // Package basedir finds templates and static files associated with a binary.
     6  package basedir
     7  
     8  import (
     9  	"bytes"
    10  	"os"
    11  	"os/exec"
    12  	"path/filepath"
    13  	"runtime"
    14  	"strings"
    15  )
    16  
    17  // Find locates a directory for the given package.
    18  // pkg should be the directory that contains the templates and/or static directories.
    19  // If pkg cannot be found, an empty string will be returned.
    20  func Find(pkg string) string {
    21  	cmd := exec.Command("go", "list", "-e", "-f", "{{.Dir}}", pkg)
    22  	if out, err := cmd.Output(); err == nil && len(out) > 0 {
    23  		return string(bytes.TrimRight(out, "\r\n"))
    24  	}
    25  	gopath := os.Getenv("GOPATH")
    26  	if gopath == "" {
    27  		gopath = defaultGOPATH()
    28  	}
    29  	if gopath != "" {
    30  		for _, dir := range strings.Split(gopath, ":") {
    31  			p := filepath.Join(dir, pkg)
    32  			if _, err := os.Stat(p); err == nil {
    33  				return p
    34  			}
    35  		}
    36  	}
    37  	return ""
    38  }
    39  
    40  // Copied from go/build/build.go
    41  func defaultGOPATH() string {
    42  	env := "HOME"
    43  	if runtime.GOOS == "windows" {
    44  		env = "USERPROFILE"
    45  	} else if runtime.GOOS == "plan9" {
    46  		env = "home"
    47  	}
    48  	if home := os.Getenv(env); home != "" {
    49  		def := filepath.Join(home, "go")
    50  		if filepath.Clean(def) == filepath.Clean(runtime.GOROOT()) {
    51  			// Don't set the default GOPATH to GOROOT,
    52  			// as that will trigger warnings from the go tool.
    53  			return ""
    54  		}
    55  		return def
    56  	}
    57  	return ""
    58  }