Build system: rake target for building a source tarball

Rakefile

@@ -35,6 +35,7 @@ require_relative "rake.d/target"
 require_relative "rake.d/application"
 require_relative "rake.d/library"
 require_relative "rake.d/format_string_verifier"
+require_relative "rake.d/tarball"
 require_relative 'rake.d/gtest' if $have_gtest
 
 def setup_globals
@@ -480,6 +481,17 @@ namespace :dev do
       formatter.write doc, File.open(qrc, "w")
     end
   end
+
+  desc "Create source code tarball from current version in .."
+  task :tarball do
+    create_source_tarball
+  end
+
+  desc "Create source code tarball from current version in .. with git revision in name"
+  task "tarball-rev" do
+    revision = `git rev-parse --short HEAD`.chomp
+    create_source_tarball "-#{revision}"
+  end
 end
 
 # Installation tasks

rake.d/tarball.rb

@@ -0,0 +1,22 @@
+def create_source_tarball suffix = ""
+  require "tmpdir"
+
+  tarball = "#{Dir.pwd}/../mkvtoolnix-#{c(:VERSION)}#{suffix}.tar.xz"
+  fail "#{tarball} does already exist" if FileTest.exists?(tarball)
+
+  Dir.mktmpdir do |dir|
+    clone_dir = "#{dir}/mkvtoolnix-#{c(:VERSION)}"
+    commands  = [
+      "git clone \"#{Dir.pwd}\" \"#{clone_dir}\"",
+      "cd #{clone_dir}",
+      "./autogen.sh",
+      "git submodule init",
+      "git submodule update",
+      "rm -rf .git",
+      "mv debian-upstream debian",
+      "cd ..",
+      "tar cJf \"#{tarball}\" mkvtoolnix-#{c(:VERSION)}",
+    ]
+    system commands.join(" && ")
+  end
+end