$ git clone -n https://src.fedoraproject.org/rpms/bind9-next.git /var/lib/mock/f40-build-761208-121369/root/chroot_tmpdir/scmroot/bind9-next
Cloning into '/var/lib/mock/f40-build-761208-121369/root/chroot_tmpdir/scmroot/bind9-next'...
$ git fetch origin 3521aec3b22d7188e7471a209f86dfe2b0190cb6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bind9-next
 * [new ref]         3521aec3b22d7188e7471a209f86dfe2b0190cb6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3521aec Fully remove PDF building support