$ git clone -n https://src.fedoraproject.org/rpms/tuba.git /var/lib/mock/f39-build-1572423-37786/root/chroot_tmpdir/scmroot/tuba
Cloning into '/var/lib/mock/f39-build-1572423-37786/root/chroot_tmpdir/scmroot/tuba'...
$ git fetch origin 15b37daae5ce043b7bf641f52761bc3346f11dcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tuba
 * [new ref]         15b37daae5ce043b7bf641f52761bc3346f11dcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15b37da Update to version 0.5.0, resolves rhbz#2240242