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// Copyright (c) 2020 Tailscale Inc & 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 (go1.16 && !ios) || (!go1.16 && !darwin) || (!go1.16 && !arm64)
// +build go1.16,!ios !go1.16,!darwin !go1.16,!arm64
package version
import (
"os"
"path"
"path/filepath"
"strings"
"rsc.io/goversion/version"
)
// CmdName returns either the base name of the current binary
// using os.Executable. If os.Executable fails (it shouldn't), then
// "cmd" is returned.
func CmdName() string {
e, err := os.Executable()
if err != nil {
return "cmd"
}
// fallbackName, the lowercase basename of the executable, is what we return if
// we can't find the Go module metadata embedded in the file.
fallbackName := filepath.Base(strings.TrimSuffix(strings.ToLower(e), ".exe"))
var ret string
v, err := version.ReadExe(e)
if err != nil {
return fallbackName
}
// v is like:
// "path\ttailscale.com/cmd/tailscale\nmod\ttailscale.com\t(devel)\t\ndep\tgithub.com/apenwarr/fixconsole\tv0.0.0-20191012055117-5a9f6489cc29\th1:muXWUcay7DDy1/hEQWrYlBy+g0EuwT70sBHg65SeUc4=\ndep\tgithub....
for _, line := range strings.Split(v.ModuleInfo, "\n") {
if strings.HasPrefix(line, "path\t") {
goPkg := strings.TrimPrefix(line, "path\t") // like "tailscale.com/cmd/tailscale"
ret = path.Base(goPkg) // goPkg is always forward slashes; use path, not filepath
break
}
}
if ret == "" {
return fallbackName
}
return ret
}
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