$ git clone -n https://src.fedoraproject.org/rpms/medusa.git /var/lib/mock/f40-build-791785-137740/root/chroot_tmpdir/scmroot/medusa
Cloning into '/var/lib/mock/f40-build-791785-137740/root/chroot_tmpdir/scmroot/medusa'...
$ git fetch origin 8ba2f7e0176310c78d4f8ec69f35e4c699530c5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/medusa
 * [new ref]         8ba2f7e0176310c78d4f8ec69f35e4c699530c5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ba2f7e Update to latest snapshot and clean up SPEC file