From 0197e6c3e33ae5870436107cdb63fe56f9f45484 Mon Sep 17 00:00:00 2001
From: "James F. Carter" <james.carter@bytemark.co.uk>
Date: Thu, 21 Apr 2016 13:14:42 +0100
Subject: added a simple tftp utility

---
 lib/custodian/util/tftp.rb    |  52 +++++++++++++++++++
 t/test-custodian-util-tftp.rb | 116 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 168 insertions(+)
 create mode 100644 lib/custodian/util/tftp.rb
 create mode 100755 t/test-custodian-util-tftp.rb

diff --git a/lib/custodian/util/tftp.rb b/lib/custodian/util/tftp.rb
new file mode 100644
index 0000000..3028874
--- /dev/null
+++ b/lib/custodian/util/tftp.rb
@@ -0,0 +1,52 @@
+require 'tmpdir'
+require 'fileutils'
+
+module Custodian
+
+  module Util
+
+    class Tftp
+
+      attr_reader :hostname, :port, :filename
+
+      #
+      # Store hostname and port
+      #
+      def initialize(hostname, port=69)
+      
+        raise ArgumentError, 'Hostname must not be nil' if  hostname.nil?
+        raise ArgumentError, 'Hostname must be a String' unless  hostname.kind_of?(String)
+        raise ArgumentError, 'Port must be a number' unless port.to_i > 0
+
+        @hostname = hostname
+        @port = port.to_i
+      end
+
+      #
+      # Returns true only if the file can be downloaded and is not zero-length.
+      #
+      def test(file)
+        target = Dir::Tmpname.make_tmpname('/tmp/', nil)
+
+        return false unless fetch(file, target)
+        return false unless File.size?(target)
+        return true
+      ensure
+        FileUtils.rm_f(target)
+      end
+
+      def fetch(file, target=nil)
+        # HPA's tftp client appears to have a 25s timeout that it is
+        # not possible to change on the command line.
+        return tftp("-m binary #{@hostname} #{@port} -c get #{file} #{target}")
+      end
+
+      def tftp(args)
+        return system("tftp #{args}") == true
+      end
+
+    end
+
+  end
+
+end
diff --git a/t/test-custodian-util-tftp.rb b/t/test-custodian-util-tftp.rb
new file mode 100755
index 0000000..0774124
--- /dev/null
+++ b/t/test-custodian-util-tftp.rb
@@ -0,0 +1,116 @@
+#!/usr/bin/ruby -I./lib/ -I../lib/
+
+require 'custodian/util/tftp'
+require 'test/unit'
+
+#
+# Unit test for our tftp utility class.
+#
+class TestTftpUtil < Test::Unit::TestCase
+
+
+  #
+  # Create the test suite environment: NOP.
+  #
+  def setup
+  end
+
+  #
+  # Destroy the test suite environment: NOP.
+  #
+  def teardown
+  end
+
+
+  #
+  # Test we can construct new objects.
+  #
+  def test_init
+
+    #
+    # Normal construction works.
+    #
+    assert_nothing_raised do
+        Custodian::Util::Tftp.new('foo')
+    end
+    assert_nothing_raised do
+        Custodian::Util::Tftp.new('foo', 123)
+    end
+    assert_nothing_raised do
+        Custodian::Util::Tftp.new('foo', '123')
+    end
+
+
+    #
+    # A hostname must be supplied
+    #
+    assert_raise ArgumentError do
+        Custodian::Util::Tftp.new(nil)
+    end
+
+    #
+    # A hostname is a string, not an array, hash, or similar.
+    #
+    assert_raise ArgumentError do
+      Custodian::Util::Tftp.new({})
+    end
+    assert_raise ArgumentError do
+      Custodian::Util::Tftp.new([])
+    end
+
+    #
+    # A port, if supplied, must be a number
+    #
+    assert_raise ArgumentError do
+      Custodian::Util::Tftp.new('foo', 'bar')
+    end
+
+    #
+    # The default port is 69
+    #
+    assert_equal(Custodian::Util::Tftp.new('foo').port, 69)
+
+
+  end
+
+  #
+  # Test a tftp successful fetch
+  #
+  def test_tftp_suceeds
+    helper = Custodian::Util::Tftp.new('foo')
+    def helper.tftp(args)
+      filename = args.split(' ').last
+      File.open(filename, 'w') { |w| w.puts 'stuff' }
+      return true
+    end
+
+    assert(helper.test('file'))
+  end
+
+  #
+  # Test a tftp failed fetch
+  #
+  def test_tftp_failed_fetch
+    helper = Custodian::Util::Tftp.new('foo')
+    def helper.tftp(args)
+      return false
+    end
+
+    assert(!helper.test('file'))
+  end
+
+  #
+  # Test a tftp fetch of empty file
+  #
+  def test_tftp_empty_file
+    helper = Custodian::Util::Tftp.new('foo')
+    def helper.tftp(args)
+      filename = args.split(' ').last
+      File.open(filename, 'w') { |w| }
+      return true
+    end
+
+    assert(!helper.test('file'))
+  end
+
+end
-- 
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