$ git clone -n https://src.fedoraproject.org/rpms/libgnt.git /var/lib/mock/f45-build-16286-484/root/chroot_tmpdir/scmroot/libgnt
Cloning into '/var/lib/mock/f45-build-16286-484/root/chroot_tmpdir/scmroot/libgnt'...
$ git fetch origin b6e9327bc21d9dace1ef9b4699bd0aedaa093421:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgnt
 * [new ref]         b6e9327bc21d9dace1ef9b4699bd0aedaa093421 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6e9327 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild