$ git clone -n https://src.fedoraproject.org/rpms/mailcap.git /var/lib/mock/f45-build-17955-506/root/chroot_tmpdir/scmroot/mailcap
Cloning into '/var/lib/mock/f45-build-17955-506/root/chroot_tmpdir/scmroot/mailcap'...
$ git fetch origin d0735a07f8cbab6fd82e891921ee4349637c04ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mailcap
 * [new ref]         d0735a07f8cbab6fd82e891921ee4349637c04ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0735a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild