Let's not duplicate the hacking instructions here (especially since they were actually wrong).
2K7ZAIY5HLB5FUEVBAC3D3UBA56TXJJG66D5ZVDBM2A7NOLHMANQC
To start hacking on Hydra, run:
$ bootstrap
$ nix-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
# Hydra
$ nix-build -A build.x86_64-linux release.nix
Hydra is a continuous integration system based on the Nix package
manager. For more information, see the
[manual](https://hydra.nixos.org/job/hydra/master/tarball/latest/download-by-type/doc/manual). For
hacking instructions, see
https://hydra.nixos.org/job/hydra/master/tarball/latest/download-by-type/doc/manual#chap-hacking.