$ git clone -n https://src.fedoraproject.org/rpms/gegl04.git /var/lib/mock/f42-build-868883-176307/root/chroot_tmpdir/scmroot/gegl04
Cloning into '/var/lib/mock/f42-build-868883-176307/root/chroot_tmpdir/scmroot/gegl04'...
$ git fetch origin ca08d446696021ca2fbb15686ad08866215362a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gegl04
 * [new ref]         ca08d446696021ca2fbb15686ad08866215362a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca08d44 Include <stdio.h> for fprintf() (#2340203)