$ git clone -n https://src.fedoraproject.org/rpms/matio.git /var/lib/mock/f42-build-864668-172514/root/chroot_tmpdir/scmroot/matio
Cloning into '/var/lib/mock/f42-build-864668-172514/root/chroot_tmpdir/scmroot/matio'...
$ git fetch origin 4134afef7a0ad629e8d527d40cdb1d099feed4c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/matio
 * [new ref]         4134afef7a0ad629e8d527d40cdb1d099feed4c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4134afe 1.5.28