$ git clone -n https://src.fedoraproject.org/rpms/ghc-crypton-x509-system.git /var/lib/mock/f45-build-10179-414/root/chroot_tmpdir/scmroot/ghc-crypton-x509-system
Cloning into '/var/lib/mock/f45-build-10179-414/root/chroot_tmpdir/scmroot/ghc-crypton-x509-system'...
$ git fetch origin b3e4274675b6631a068fcba0ea5d1cd112cac0be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-crypton-x509-system
 * [new ref]         b3e4274675b6631a068fcba0ea5d1cd112cac0be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3e4274 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild