feat: add exepected file option

CHANGELOG.md

@@ -0,0 +1,10 @@
+# CHANGELOG
+## 1.1.0 (2017-12-15)
+
+ * add expected file option
+ * add changelog
+ * fix copyright in LICENSE file
+
+## 1.0.0 (2017-11-09)
+
+ * first version

README.md

@@ -1,9 +1,9 @@
 # is_master
-[![Version](https://img.shields.io/badge/latest_version-1.0.0-green.svg)](https://github.com/nishiki/is_master/releases)
+[![Version](https://img.shields.io/badge/latest_version-1.1.0-green.svg)](https://github.com/nishiki/is_master/releases)
 [![Build Status](https://travis-ci.org/nishiki/is_master.svg?branch=master)](https://travis-ci.org/nishiki/is_master)
 [![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](https://github.com/nishiki/is_master/blob/master/LICENSE)
 
-is_master execute a command when it determine that server is master
+is_master execute a command when on the machine there is the expected vip or file.
 
 ## Install
 
@@ -19,6 +19,10 @@ It's simple:
 ```
 is_master 10.0.254.2 ls -l
 ```
+or
+```
+is_master /path/to/file ls -l
+```
 
 ## Development
 ### Test on local machine with docker

VERSION

@@ -1 +1 @@
-1.0.0
+1.1.0

bin/is_master

@@ -20,16 +20,17 @@ require 'socket'
 
 if ARGV.length < 2
   puts 'is_master execute a command when it determine that server is master'
-  puts "Usage: #{$PROGRAM_NAME} VIP COMMAND"
-  puts '  VIP - IP address expected to be master'
+  puts "Usage: #{$PROGRAM_NAME} [VIP|FILE] COMMAND"
+  puts '  VIP     - IP address expected to be master'
+  puts '  FILE    - File expected to be master'
   puts '  COMMAND - Command to execute if host is master'
   exit 2
 end
 
-vip = ARGV[0]
-command = ARGV[1..-1].join(' ')
+expected = ARGV[0]
+command  = ARGV[1..-1].join(' ')
 
-if Socket.ip_address_list.map(&:ip_address).include?(vip)
+if Socket.ip_address_list.map(&:ip_address).include?(expected) || File.exist?(expected)
   Kernel.exec(command)
 else
   puts 'OK - I am slave, i going to sleep'

test/test_cli.rb

@@ -1,6 +1,14 @@
 require 'test/unit'
 
 class TestCli < Test::Unit::TestCase
+  def test_missing_arg
+    output = %x(is_master 127.0.0.1)
+    assert_match('Usage: ', output)
+
+    output = %x(is_master)
+    assert_match('Usage: ', output)
+  end
+
   def test_slave_mode
     output = %x(is_master 10.255.255.0 echo 'GOOD!')
     assert_match('I am slave', output)
@@ -11,11 +19,15 @@ class TestCli < Test::Unit::TestCase
     assert_match('GOOD!', output)
   end
 
-  def test_missing_arg
-    output = %x(is_master 127.0.0.1)
-    assert_match('Usage: ', output)
+  def test_file_slave_mode
+    output = %x(is_master /tmp/test.txt echo 'GOOD!')
+    assert_match('I am slave', output)
+  end
 
-    output = %x(is_master)
-    assert_match('Usage: ', output)
+  def test_file_master_mode
+    File.write('/tmp/test.txt', '')
+    output = %x(is_master /tmp/test.txt echo 'GOOD!')
+    assert_match('GOOD!', output)
+    File.unlink('/tmp/test.txt')
   end
 end