$ git clone -n https://src.fedoraproject.org/forks/hypersa/rpms/ghc-haskell-gi-overloading.git /var/lib/mock/f39-build-2218565-52612/root/chroot_tmpdir/scmroot/ghc-haskell-gi-overloading
Cloning into '/var/lib/mock/f39-build-2218565-52612/root/chroot_tmpdir/scmroot/ghc-haskell-gi-overloading'...
$ git fetch origin 6dd84ac383b60a4c4c5179be4489248a20722aae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/hypersa/rpms/ghc-haskell-gi-overloading
 * [new ref]         6dd84ac383b60a4c4c5179be4489248a20722aae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6dd84ac rv64 rebuild