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#!ruby -an
BEGIN {
require 'fileutils'
dir = ARGV.shift
ARGF.eof?
FileUtils.mkdir_p(dir)
Dir.chdir(dir)
}
n, v, u, r = $F
next if n =~ /^#/
if File.directory?(n)
puts "updating #{n} ..."
system("git", "fetch", chdir: n) or abort
else
puts "retrieving #{n} ..."
system(*%W"git clone #{u} #{n}") or abort
end
c = r || "v#{v}"
checkout = %w"git -c advice.detachedHead=false checkout"
puts "checking out #{c} (v=#{v}, r=#{r}) ..."
unless system(*checkout, c, "--", chdir: n)
abort
end
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