$ git clone -n https://src.fedoraproject.org/rpms/bind.git /var/lib/mock/f42-build-side-1-3537705-46560/root/chroot_tmpdir/scmroot/bind
Cloning into '/var/lib/mock/f42-build-side-1-3537705-46560/root/chroot_tmpdir/scmroot/bind'...
$ git fetch origin ea2fc21f015a0ba2db470fb774d8d387e59eab04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bind
 * [new ref]         ea2fc21f015a0ba2db470fb774d8d387e59eab04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea2fc21 Hide warning about unused pin variable