Add -version flag

cmd/certspotter/main.go

@@ -206,7 +206,7 @@ func processEntry(scanner *certspotter.Scanner, entry *ct.LogEntry) {
 }
 
 func main() {
-	flag.Parse()
+	cmd.ParseFlags()
 
 	if *watchlistFilename == "-" {
 		var err error

cmd/common.go

@@ -33,6 +33,7 @@ var script = flag.String("script", "", "Script to execute when a matching certif
 var logsURL = flag.String("logs", defaultLogList, "File path or URL of JSON list of logs to monitor")
 var noSave = flag.Bool("no_save", false, "Do not save a copy of matching certificates")
 var verbose = flag.Bool("verbose", false, "Be verbose")
+var showVersion = flag.Bool("version", false, "Print version and exit")
 var startAtEnd = flag.Bool("start_at_end", false, "Start monitoring logs from the end rather than the beginning")
 var allTime = flag.Bool("all_time", false, "Scan certs from all time, not just since last scan")
 var state *State
@@ -298,6 +299,14 @@ func processLog(logInfo *loglist.Log, processCallback certspotter.ProcessCallbac
 	return 0
 }
 
+func ParseFlags() {
+	flag.Parse()
+	if *showVersion {
+		fmt.Fprintf(os.Stdout, "Cert Spotter %s\n", certspotter.Version)
+		os.Exit(0)
+	}
+}
+
 func Main(statePath string, processCallback certspotter.ProcessCallback) int {
 	var err error
 

cmd/ctparsewatch/main.go

@@ -47,6 +47,6 @@ func processEntry(scanner *certspotter.Scanner, entry *ct.LogEntry) {
 }
 
 func main() {
-	flag.Parse()
+	cmd.ParseFlags()
 	os.Exit(cmd.Main(*stateDir, processEntry))
 }

version.go

@@ -0,0 +1,12 @@
+// Copyright (C) 2021 Opsmate, Inc.
+//
+// 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 http://mozilla.org/MPL/2.0/.
+//
+// This software is distributed WITHOUT A WARRANTY OF ANY KIND.
+// See the Mozilla Public License for details.
+
+package certspotter
+
+const Version = "0.11"