Add option to forward log messages to syslog

lib/smsd.rb

@@ -1,3 +1,5 @@
+require 'syslog/logger'
+
 require 'smsd/version'
 require 'smsd/cli'
 require 'smsd/cli/options'

lib/smsd/cli.rb

@@ -13,6 +13,9 @@ module SMSd
 
       init_logger
       @modem = Biju::Hayes.new(options[:modem], pin: options[:pin])
+    rescue Errno::ENOENT => e
+      logger.warn e.message
+      exit
     end
 
     def run
@@ -34,12 +37,16 @@ module SMSd
     private
 
     def init_logger
-      @logger = Logger.new(
-        Util::MultiIO.new(STDOUT,
-                          File.open(@options[:logfile] || 'smsd.log', 'a')))
+      if @options[:syslog]
+        @logger = Syslog::Logger.new($PROGRAM_NAME)
+      else
+        @logger = Logger.new(
+          Util::MultiIO.new(STDOUT,
+                            File.open(@options[:logfile] || 'smsd.log', 'a')))
 
-      logger.formatter = proc do |severity, datetime, progrname, msg|
-        "#{$PROGRAM_NAME}: #{datetime} [#{severity}] #{msg}\n"
+        logger.formatter = proc do |severity, datetime, progrname, msg|
+          "#{$PROGRAM_NAME}: #{datetime} [#{severity}] #{msg}\n"
+        end
       end
     end
 

lib/smsd/cli/options.rb

@@ -21,6 +21,10 @@ module SMSd
             options[:logfile] = logfile
           end
 
+          opts.on('-s', '--[no-]syslog', 'Use syslog as logger') do |syslog|
+            options[:syslog] = syslog
+          end
+
           opts.on('-p', '--pin PIN', 'Specify the SIM PIN') do |pin|
             options[:pin] = pin
           end