$ git clone -n https://src.fedoraproject.org/rpms/rabbitvcs.git /var/lib/mock/f39-build-1530888-36198/root/chroot_tmpdir/scmroot/rabbitvcs
Cloning into '/var/lib/mock/f39-build-1530888-36198/root/chroot_tmpdir/scmroot/rabbitvcs'...
$ git fetch origin ae99de6194e2eb9f02899bbc7641ae1bffc8c110:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rabbitvcs
 * [new ref]         ae99de6194e2eb9f02899bbc7641ae1bffc8c110 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae99de6 Add Requires for python3-rabbitvcs to rabbitvcs-cli