all: Use new reflect based CLI (#5487)

lib/build/build.go

@@ -0,0 +1,81 @@
+// 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" // Set by build script
+	User    = "unknown" // Set by build script
+	Stamp   = "0"       // Set by build script
+
+	// Static
+	Codename = "Erbium Earthworm"
+
+	// 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)
+
+	date := Date.UTC().Format("2006-01-02 15:04:05 MST")
+	LongVersion = fmt.Sprintf(`syncthing %s "%s" (%s %s-%s) %s@%s %s`, Version, Codename, runtime.Version(), runtime.GOOS, runtime.GOARCH, User, Host, date)
+
+	if len(Tags) > 0 {
+		LongVersion = fmt.Sprintf("%s [%s]", LongVersion, strings.Join(Tags, ", "))
+	}
+}