$ git clone -n https://src.fedoraproject.org/rpms/httpcomponents-client.git /var/lib/mock/f40-build-2193966-51481/root/chroot_tmpdir/scmroot/httpcomponents-client
Cloning into '/var/lib/mock/f40-build-2193966-51481/root/chroot_tmpdir/scmroot/httpcomponents-client'...
$ git fetch origin 33f2361fbe6a7a24d3cb1fa8e28d75adb7450012:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/httpcomponents-client
 * [new ref]         33f2361fbe6a7a24d3cb1fa8e28d75adb7450012 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33f2361 Get rid of module_prefix macro