From 8e6bf2a0799476b5e29e98b4abe073f91127a4e4 Mon Sep 17 00:00:00 2001
From: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Date: Sun, 13 Mar 2011 23:56:44 +0000
Subject: First version.

---
 persistent_crontab_minutes.rb | 56 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 persistent_crontab_minutes.rb

(limited to 'persistent_crontab_minutes.rb')

diff --git a/persistent_crontab_minutes.rb b/persistent_crontab_minutes.rb
new file mode 100644
index 0000000..44c6328
--- /dev/null
+++ b/persistent_crontab_minutes.rb
@@ -0,0 +1,56 @@
+#
+# persistent_crontab_minutes.rb
+#
+
+require 'md5'
+
+module Puppet::Parser::Functions
+  newfunction(:persistent_crontab_minutes, :type => :rvalue) do |arguments|
+
+    raise(Puppet::ParseError, "Wrong number of arguments " +
+      "given (#{arguments.size} for 2)") if arguments.size < 2
+
+    value = 0
+
+    job  = arguments[0]
+    host = arguments[1]
+
+    environment = Puppet[:environment]
+
+    # We select first directory that exists.  This might not be the best idea ...
+    modules = Puppet[:modulepath].split(':').select { |i| File.exists?(i) }.first
+
+    raise(Puppet::ParseError, "Unable to determine the storage " +
+      "directory for Puppet modules") unless modules
+
+    # Prepare the file where we store current value ...
+    file = "/puppet/state/crontab/#{host}-#{job}.minutes"
+    file = File.join(modules, file)
+
+    if FileTest.exists?(file)
+      File.open(file, 'r') { |f| value = f.read.to_i }
+
+      raise(Puppet::ParseError, "The value for minutes in the file `%s' " +
+        "is out of the range from 0 to 59 inclusive") unless value < 60
+    else
+      #
+      # Pick a random number based on the job and host name.  This will yield
+      # the same value for exactly the same combination of the job and host name.
+      #
+      value = MD5.new(job_name + host).to_s.hex % 60
+
+      # Minutes are from 0 to 59 inclusive ...
+      value = value < 60 ? value : 59
+
+      File.open(file, 'w') { |f| f.write(value) }
+    end
+
+    # Tell Puppet to keep an eye on this file ...
+    parser = Puppet::Parser::Parser.new(environment)
+    parser.watch_file(file) if File.exists?(file)
+
+    return value
+  end # def newfunction
+end # module Puppet::Parser::Functions
+
+# vim: set ts=2 sw=2 et :
-- 
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