$ git clone -n https://src.fedoraproject.org/rpms/perl-Email-Sender.git /var/lib/mock/f45-build-23313-596/root/chroot_tmpdir/scmroot/perl-Email-Sender
Cloning into '/var/lib/mock/f45-build-23313-596/root/chroot_tmpdir/scmroot/perl-Email-Sender'...
$ git fetch origin e3628e3a142b45aaab42e4e44aa3e3dff5736ef6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Email-Sender
 * [new ref]         e3628e3a142b45aaab42e4e44aa3e3dff5736ef6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3628e3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild