$ git clone -n https://src.fedoraproject.org/rpms/cairo-dock-plug-ins.git /var/lib/mock/f40-build-799081-142138/root/chroot_tmpdir/scmroot/cairo-dock-plug-ins
Cloning into '/var/lib/mock/f40-build-799081-142138/root/chroot_tmpdir/scmroot/cairo-dock-plug-ins'...
$ git fetch origin cef4a021720b5db07a9d5c5259bb2ae17f5ac95f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cairo-dock-plug-ins
 * [new ref]         cef4a021720b5db07a9d5c5259bb2ae17f5ac95f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cef4a02 vala: regenerate C source from vala source properly