COMMIT: a git revision ID (SHA1 or symbolic reference like HEAD)
+ You must first tunnel $addr to perl5.git.perl.org:3000? E.g.
+ \$ ssh -C -L${\ join q{:} => reverse split /:/, $addr}:3000 perl5.git.perl.org
+
HERE
die $usage if grep { /^(--help|-h)$/ } @ARGV;