[Ovirt-devel] [PATCH server] Rake task to generate a dot drawing of the possible VM states

[David Lutterkort]

I was curious what all the VM state transitions taken together look like
- below is a rake task that generates a dot drawing of the FSM of VM
states.

Attached is a picture of all that for everybody's amusement.

David

>From 08d72ae336afedcfa0dac9a57e5a79a2b6effac8 Mon Sep 17 00:00:00 2001
From: David Lutterkort <lutter at redhat.com>
Date: Tue, 6 Jan 2009 16:54:31 -0800
Subject: [PATCH server] Rake task to generate a dot drawing of the possible VM states

---
 src/lib/tasks/vm-states-dot.rake |   40 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 40 insertions(+), 0 deletions(-)
 create mode 100644 src/lib/tasks/vm-states-dot.rake

diff --git a/src/lib/tasks/vm-states-dot.rake b/src/lib/tasks/vm-states-dot.rake
new file mode 100644
index 0000000..74f1f8e
--- /dev/null
+++ b/src/lib/tasks/vm-states-dot.rake
@@ -0,0 +1,40 @@
+# -*- ruby -*-
+require 'permission'
+require 'task'
+require 'vm'
+require 'vm_task'
+
+desc "Generate a dot file for VM state transitions (pass output file in\nvariable 'output')"
+task "vm:states:dot" do
+    out = $stdout
+    out = File::open(ENV['output'], 'w') if ENV['output']
+
+    # Classify states
+    states = {}
+    [:start, :running, :success, :failure].each do |tag|
+        VmTask::ACTIONS.values.each { |a|
+            states[a[tag]] ||= []
+            states[a[tag]] << tag
+        }
+    end
+
+    out.puts "digraph \"VM Task Transitions\" {"
+    states.each do |state, tags|
+        out.print "  #{state} ["
+        if tags == [:running]
+            out.print("shape=box color=\"#666666\" fontcolor=\"#666666\"")
+        end
+        out.puts "];"
+    end
+    VmTask::ACTIONS.values.each do |a|
+        out.puts "#{a[:start]} -> #{a[:running]} [ label = \"#{a[:label]}\" ];"
+        out.puts "#{a[:running]} -> #{a[:success]} [ color = green ];"
+        out.puts "#{a[:running]} -> #{a[:failure]} [ color= red ];"
+    end
+    out.puts '":running" [shape=box color="#666666" fontcolor="#666666"];'
+    out.puts '":start" -> ":running" [ label = "Action" ];'
+    out.puts '":running" -> ":success" [ color = green ];'
+    out.puts '":running" -> ":failure" [ color= red ];'
+    out.puts "}"
+    out.close
+end
-- 
1.6.0.6


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