$ git clone -n https://src.fedoraproject.org/rpms/ghc-unbounded-delays.git /var/lib/mock/f41-build-838849-159865/root/chroot_tmpdir/scmroot/ghc-unbounded-delays
Cloning into '/var/lib/mock/f41-build-838849-159865/root/chroot_tmpdir/scmroot/ghc-unbounded-delays'...
$ git fetch origin e7c49e6f5483e60096e522969f0537e26ff9d611:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-unbounded-delays
 * [new ref]         e7c49e6f5483e60096e522969f0537e26ff9d611 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7c49e6 bump release