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@@ -0,0 +1,41 @@
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+// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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+// Use of this source code is governed by a BSD-style
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+// license that can be found in the LICENSE file.
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+
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+package version
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+
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+import (
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+ "os"
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+ "path"
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+ "strings"
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+
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+ "rsc.io/goversion/version"
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+)
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+
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+// CmdName returns either the base name of the current binary
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+// using os.Executable. If os.Executable fails (it sholdn't), then
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+// "cmd" is returned.
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+func CmdName() string {
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+ e, err := os.Executable()
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+ if err != nil {
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+ return "cmd"
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+ }
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+ var ret string
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+ v, err := version.ReadExe(e)
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+ if err != nil {
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+ ret = strings.TrimSuffix(strings.ToLower(e), ".exe")
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+ } else {
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+ // v is like:
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+ // "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....
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+ for _, line := range strings.Split(v.ModuleInfo, "\n") {
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+ if strings.HasPrefix(line, "path\t") {
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+ ret = path.Base(strings.TrimPrefix(line, "path\t"))
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+ break
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+ }
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+ }
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+ }
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+ if ret == "" {
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+ return "cmd"
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+ }
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+ return ret
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+}
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Brad Fitzpatrick