forked from TrueCloudLab/distribution
53 lines
1 KiB
Go
53 lines
1 KiB
Go
// Copyright 2020 Google LLC. 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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package gensupport
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import (
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"runtime"
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"strings"
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"unicode"
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)
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// GoVersion returns the Go runtime version. The returned string
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// has no whitespace.
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func GoVersion() string {
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return goVersion
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}
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var goVersion = goVer(runtime.Version())
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const develPrefix = "devel +"
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func goVer(s string) string {
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if strings.HasPrefix(s, develPrefix) {
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s = s[len(develPrefix):]
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if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 {
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s = s[:p]
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}
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return s
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}
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if strings.HasPrefix(s, "go1") {
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s = s[2:]
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var prerelease string
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if p := strings.IndexFunc(s, notSemverRune); p >= 0 {
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s, prerelease = s[:p], s[p:]
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}
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if strings.HasSuffix(s, ".") {
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s += "0"
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} else if strings.Count(s, ".") < 2 {
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s += ".0"
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}
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if prerelease != "" {
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s += "-" + prerelease
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}
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return s
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}
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return ""
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}
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func notSemverRune(r rune) bool {
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return !strings.ContainsRune("0123456789.", r)
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}
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