$ git clone -n https://src.fedoraproject.org/rpms/fedrq.git /var/lib/mock/f39-build-2519877-61728/root/chroot_tmpdir/scmroot/fedrq
Cloning into '/var/lib/mock/f39-build-2519877-61728/root/chroot_tmpdir/scmroot/fedrq'...
$ git fetch origin b1524b75e198f14de3069f922f9a35f504ad6e57:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedrq
 * [new ref]         b1524b75e198f14de3069f922f9a35f504ad6e57 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1524b7 Update to 0.14.0.