rake task for downloading osm data

Rakefile

@@ -2,7 +2,7 @@ sandbox = "sandbox"   #where to locate builds, server configs and test data
 osm_data = "amager"   #name of OSM data file
 
 desc "Recompile,  reprocess OSM data and run server"
-task :default => [:compile, :process, :run]
+task :default => [:compile, "data:process", :run]
 
 desc "Compile"
 task :compile do
@@ -14,6 +14,7 @@ file "#{sandbox}/amager.osm.pbf" => "amager.osm.pbf" do |t|
   raise unless system "cp #{t.prerequisites.join} #{t.name}"
 end
 
+namespace :data do
   desc "Reprocess OSM test data"
   task :process => ["#{sandbox}/amager.osm.pbf", :setup] do
     prev = Dir.pwd
@@ -23,6 +24,18 @@ task :process => ["#{sandbox}/amager.osm.pbf", :setup] do
     cd prev
   end
 
+  desc "Download fresh OSM for the test data"
+  task :download => :setup do
+    start = Time.now
+    country = 'denmark'
+    bbox = 'top=55.6655 left=12.5589 bottom=55.6462 right=12.5963'
+    area = 'amager'
+
+    raise "Error while downloading data." unless system "curl http://download.geofabrik.de/osm/europe/#{country}.osm.pbf -o #{sandbox}/#{country}.osm.pbf"
+    raise "Error while cropping data." unless system "osmosis --read-pbf file=#{sandbox}/#{country}.osm.pbf --bounding-box #{bbox} --write-pbf file=#{sandbox}/#{area}.osm.pbf omitmetadata=true"
+  end
+end
+
 desc "Setup server files"
 task :setup => ["#{sandbox}/speedprofile.ini", "#{sandbox}/extractor.ini", "#{sandbox}/server.ini"]