$ git clone -n https://src.fedoraproject.org/rpms/perl-Date-Handler.git /var/lib/mock/f45-build-22977-595/root/chroot_tmpdir/scmroot/perl-Date-Handler
Cloning into '/var/lib/mock/f45-build-22977-595/root/chroot_tmpdir/scmroot/perl-Date-Handler'...
$ git fetch origin 519cc911f5b9d96c3d7e4149f5c6bb65a4656f7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Date-Handler
 * [new ref]         519cc911f5b9d96c3d7e4149f5c6bb65a4656f7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 519cc91 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild