$ git clone -n https://src.fedoraproject.org/rpms/mepack.git /var/lib/mock/f42-build-864671-172514/root/chroot_tmpdir/scmroot/mepack
Cloning into '/var/lib/mock/f42-build-864671-172514/root/chroot_tmpdir/scmroot/mepack'...
$ git fetch origin bcf5886ad366193e44754823e857d2577744f44d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mepack
 * [new ref]         bcf5886ad366193e44754823e857d2577744f44d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcf5886 Rebuild for hdf5 1.14.5