$ git clone -n https://src.fedoraproject.org/rpms/bind.git /var/lib/mock/f42-build-side-1-3502109-45977/root/chroot_tmpdir/scmroot/bind
Cloning into '/var/lib/mock/f42-build-side-1-3502109-45977/root/chroot_tmpdir/scmroot/bind'...
$ git fetch origin feddafc9cfb7d67c816c375db4b64e4f2a5783de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bind
 * [new ref]         feddafc9cfb7d67c816c375db4b64e4f2a5783de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at feddafc Deactivate jemalloc linking