$ git clone -n https://src.fedoraproject.org/rpms/expatpp.git /var/lib/mock/f45-build-8551-391/root/chroot_tmpdir/scmroot/expatpp
Cloning into '/var/lib/mock/f45-build-8551-391/root/chroot_tmpdir/scmroot/expatpp'...
$ git fetch origin 3786cb0aebae84bff8dc85bc88f9dac68bca3919:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/expatpp
 * [new ref]         3786cb0aebae84bff8dc85bc88f9dac68bca3919 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3786cb0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild