$ git clone -n https://src.fedoraproject.org/rpms/libcupsfilters.git /var/lib/mock/f39-build-1501094-34817/root/chroot_tmpdir/scmroot/libcupsfilters
Cloning into '/var/lib/mock/f39-build-1501094-34817/root/chroot_tmpdir/scmroot/libcupsfilters'...
$ git fetch origin cf4663f1155d0c9836fb3ed0b22008af61ea8a61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcupsfilters
 * [new ref]         cf4663f1155d0c9836fb3ed0b22008af61ea8a61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf4663f rebuilt for side-tag with libppd