$ git clone -n https://src.fedoraproject.org/rpms/octave.git /var/lib/mock/f41-build-side-1-2969456-35819/root/chroot_tmpdir/scmroot/octave
Cloning into '/var/lib/mock/f41-build-side-1-2969456-35819/root/chroot_tmpdir/scmroot/octave'...
$ git fetch origin 468d62578d62e4bfd92bb5fac157dd2c886bfc18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave
 * [new ref]         468d62578d62e4bfd92bb5fac157dd2c886bfc18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 468d625 convert GPLv3+ license to SPDX