$ git clone -n https://src.fedoraproject.org/rpms/gtts.git /var/lib/mock/f45-build-13217-447/root/chroot_tmpdir/scmroot/gtts
Cloning into '/var/lib/mock/f45-build-13217-447/root/chroot_tmpdir/scmroot/gtts'...
$ git fetch origin e65c45886937240a85c0e701a7120d1ea3570ec3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtts
 * [new ref]         e65c45886937240a85c0e701a7120d1ea3570ec3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e65c458 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild