$ git clone -n https://src.fedoraproject.org/rpms/rigsync.git /var/lib/mock/f45-build-34523-687/root/chroot_tmpdir/scmroot/rigsync
Cloning into '/var/lib/mock/f45-build-34523-687/root/chroot_tmpdir/scmroot/rigsync'...
$ git fetch origin f619e4e0e9209788633252c3dc4ee103f08bdf70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rigsync
 * [new ref]         f619e4e0e9209788633252c3dc4ee103f08bdf70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f619e4e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild