$ git clone -n https://src.fedoraproject.org/rpms/httpd.git /var/lib/mock/f40-build-2236865-53525/root/chroot_tmpdir/scmroot/httpd
Cloning into '/var/lib/mock/f40-build-2236865-53525/root/chroot_tmpdir/scmroot/httpd'...
$ git fetch origin df3d3d1151513090e3ba649f03bdaa6817d87c5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/httpd
 * [new ref]         df3d3d1151513090e3ba649f03bdaa6817d87c5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df3d3d1 - remove some old workarounds