$ git clone -n https://src.fedoraproject.org/rpms/polari.git /var/lib/mock/f42-build-side-1-3589331-46957/root/chroot_tmpdir/scmroot/polari
Cloning into '/var/lib/mock/f42-build-side-1-3589331-46957/root/chroot_tmpdir/scmroot/polari'...
$ git fetch origin becc4ae422a7db9303fef93a9413218c66cff562:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polari
 * [new ref]         becc4ae422a7db9303fef93a9413218c66cff562 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at becc4ae Rebuild for the renaming of tracker to tinysparql