$ git clone -n https://src.fedoraproject.org/rpms/commit-stream.git /var/lib/mock/f39-build-1797940-41766/root/chroot_tmpdir/scmroot/commit-stream
Cloning into '/var/lib/mock/f39-build-1797940-41766/root/chroot_tmpdir/scmroot/commit-stream'...
$ git fetch origin 63887998ac4460e704690ca1d6b8eac789545826:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/commit-stream
 * [new ref]         63887998ac4460e704690ca1d6b8eac789545826 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6388799 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild