cvs_tags.rb

# CVS tag scanner (Ruby)
# collecting all existing tags
tags = []
IO.popen('cvs status -v .') do |p|
	while line = p.gets
		match = /(\S+)\s+\(revision:.+\)/.match(line)
		tags << match[1] if match
	end
end

# looking for production tags
tags = tags.uniq.find_all {|tag| tag =~ /_PROD$/} # production tags have a trailing _PROD

# creating menu
puts
puts "Possible production tags:"
tags.each_with_index do |tag, i|
	puts "#{i}: #{tag}"
end
puts

CVS_UPDATE = "cvs update -dPRr"
print "Choose a number to execute '#{CVS_UPDATE}' on (ctrl+c to abort): " 
index = gets.to_i

# running cvs update
if index < tags.length
	cmd_line = "#{CVS_UPDATE} #{tags[index]}".squeeze
	puts "Starting: #{cmd_line}"
	exec cmd_line
else
	puts "Invalid option."
end