$ git clone -n https://src.fedoraproject.org/rpms/libeconf.git /var/lib/mock/f42-build-side-1-3497623-45961/root/chroot_tmpdir/scmroot/libeconf
Cloning into '/var/lib/mock/f42-build-side-1-3497623-45961/root/chroot_tmpdir/scmroot/libeconf'...
$ git fetch origin 7ca42ecaf8812a4297378c15a2f7acb460a78e8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libeconf
 * [new ref]         7ca42ecaf8812a4297378c15a2f7acb460a78e8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ca42ec Rebase to 0.7.6