$ git clone -n https://src.fedoraproject.org/rpms/mmsd-tng.git /var/lib/mock/f42-build-60918647-6585803/root/chroot_tmpdir/scmroot/mmsd-tng
Cloning into '/var/lib/mock/f42-build-60918647-6585803/root/chroot_tmpdir/scmroot/mmsd-tng'...
$ git fetch origin 839ee79aae1931282437ebc963327891b421aba3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mmsd-tng
 * [new ref]         839ee79aae1931282437ebc963327891b421aba3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 839ee79 2.6.4