syncthing/lib/build/build.go

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// Copyright (C) 2019 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package build
import (
"fmt"
"log"
"regexp"
"runtime"
"strconv"
"strings"
"time"
)
var (
// Injected by build script
Version = "unknown-dev"
Host = "unknown"
User = "unknown"
Stamp = "0"
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// Static
Codename = "Fermium Flea"
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// Set by init()
Date time.Time
IsRelease bool
IsCandidate bool
IsBeta bool
LongVersion string
// Set by Go build tags
Tags []string
allowedVersionExp = regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z0-9]+)*(\.\d+)*(\+\d+-g[0-9a-f]+)?(-[^\s]+)?$`)
)
func init() {
if Version != "unknown-dev" {
// If not a generic dev build, version string should come from git describe
if !allowedVersionExp.MatchString(Version) {
log.Fatalf("Invalid version string %q;\n\tdoes not match regexp %v", Version, allowedVersionExp)
}
}
setBuildData()
}
func setBuildData() {
// Check for a clean release build. A release is something like
// "v0.1.2", with an optional suffix of letters and dot separated
// numbers like "-beta3.47". If there's more stuff, like a plus sign and
// a commit hash and so on, then it's not a release. If it has a dash in
// it, it's some sort of beta, release candidate or special build. If it
// has "-rc." in it, like "v0.14.35-rc.42", then it's a candidate build.
//
// So, every build that is not a stable release build has IsBeta = true.
// This is used to enable some extra debugging (the deadlock detector).
//
// Release candidate builds are also "betas" from this point of view and
// will have that debugging enabled. In addition, some features are
// forced for release candidates - auto upgrade, and usage reporting.
exp := regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z]+[\d\.]+)?$`)
IsRelease = exp.MatchString(Version)
IsCandidate = strings.Contains(Version, "-rc.")
IsBeta = strings.Contains(Version, "-")
stamp, _ := strconv.Atoi(Stamp)
Date = time.Unix(int64(stamp), 0)
LongVersion = LongVersionFor("syncthing")
}
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// LongVersionFor returns the long version string for the given program name.
func LongVersionFor(program string) string {
// This string and date format is essentially part of our external API. Never change it.
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date := Date.UTC().Format("2006-01-02 15:04:05 MST")
v := fmt.Sprintf(`%s %s "%s" (%s %s-%s) %s@%s %s`, program, Version, Codename, runtime.Version(), runtime.GOOS, runtime.GOARCH, User, Host, date)
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if len(Tags) > 0 {
v = fmt.Sprintf("%s [%s]", v, strings.Join(Tags, ", "))
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}
return v
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}