$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Stag.git /var/lib/mock/f45-build-22997-595/root/chroot_tmpdir/scmroot/perl-Data-Stag
Cloning into '/var/lib/mock/f45-build-22997-595/root/chroot_tmpdir/scmroot/perl-Data-Stag'...
$ git fetch origin 723caf2966202c44ce2d37131521d34ba0780ad6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Stag
 * [new ref]         723caf2966202c44ce2d37131521d34ba0780ad6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 723caf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild