$ git clone -n https://src.fedoraproject.org/rpms/ghc-url.git /var/lib/mock/f45-build-10930-425/root/chroot_tmpdir/scmroot/ghc-url
Cloning into '/var/lib/mock/f45-build-10930-425/root/chroot_tmpdir/scmroot/ghc-url'...
$ git fetch origin 86c2916e47a0d6e9551e83a22082a9f4fcfe4aa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-url
 * [new ref]         86c2916e47a0d6e9551e83a22082a9f4fcfe4aa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86c2916 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild