$ git clone -n https://src.fedoraproject.org/rpms/ghc-hxt.git /var/lib/mock/f45-build-10418-416/root/chroot_tmpdir/scmroot/ghc-hxt
Cloning into '/var/lib/mock/f45-build-10418-416/root/chroot_tmpdir/scmroot/ghc-hxt'...
$ git fetch origin 7d80dda3db8096cc5d4ee9a3add2657acb3ccc7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hxt
 * [new ref]         7d80dda3db8096cc5d4ee9a3add2657acb3ccc7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d80dda Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild