$ git clone -n https://src.fedoraproject.org/rpms/httpcomponents-client4.git /var/lib/mock/f41-build-side-1-3104716-39368/root/chroot_tmpdir/scmroot/httpcomponents-client4
Cloning into '/var/lib/mock/f41-build-side-1-3104716-39368/root/chroot_tmpdir/scmroot/httpcomponents-client4'...
$ git fetch origin d891b96dc87aacf7987197b3aaf78fb849af3b38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/httpcomponents-client4
 * [new ref]         d891b96dc87aacf7987197b3aaf78fb849af3b38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d891b96 Added the README