$ git clone -n https://src.fedoraproject.org/rpms/mesa.git /var/lib/mock/f45-build-18251-512/root/chroot_tmpdir/scmroot/mesa
Cloning into '/var/lib/mock/f45-build-18251-512/root/chroot_tmpdir/scmroot/mesa'...
$ git fetch origin 641cbe502b0ce34bfcab5c8c0d48fe6972530cb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mesa
 * [new ref]         641cbe502b0ce34bfcab5c8c0d48fe6972530cb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 641cbe5 Update to 26.2.0 upstream release