$ git clone -n https://src.fedoraproject.org/rpms/haproxy.git /var/lib/mock/f42-build-side-1-3585381-46904/root/chroot_tmpdir/scmroot/haproxy
Cloning into '/var/lib/mock/f42-build-side-1-3585381-46904/root/chroot_tmpdir/scmroot/haproxy'...
$ git fetch origin 49c26aa60b5fa488b5048e33cb0bcc206df1ac0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/haproxy
 * [new ref]         49c26aa60b5fa488b5048e33cb0bcc206df1ac0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49c26aa Add explicit BR: libxcrypt-devel