gistfile1.txt

#!/usr/bin/ruby
=begin
If you have subversion repository with many externals, it may take a bit too long to update it, as updates happen one after another.

This bit of script updates each external in parallel, making it oh so much faster.

(note: if you add an external or change an external property in another way, you'll need to run the standard svn up once)

Last seen on http://codesnippets.joyent.com/posts/show/548
=end

puts(
  ( `svn pl -R`.scan(/\S.*'(.*)':\n((?:  .*\n)+)/)\
    .inject({}) { |h, (d, p)| h[d] = p.strip.split(/\s+/); h }\
    .select { |d, ps| ps.include? 'svn:externals' }\
    .map { |xd, ps| [xd, `svn pg svn:externals #{xd}|grep -v ^#`] }\
    .map { |xd, exts| exts.strip.split(/\s*\n/).map { |l| xd + '/' + l.split(/\s+/).first } }\
    .inject { |a, b| a + b }\
    .map { |d| "cd #{d} && svn up 2>&1" } \
    << 'svn up . --ignore-externals 2>&1'
  )\
  .map { |cmd| [cmd, Thread.new { `#{cmd}` }] }\
  .map { |cmd, thread| "#{cmd}\n#{thread.value}" }.join("\n")
)