$ git clone -n https://src.fedoraproject.org/rpms/koji.git /var/lib/mock/f39-build-1620614-38692/root/chroot_tmpdir/scmroot/koji
Cloning into '/var/lib/mock/f39-build-1620614-38692/root/chroot_tmpdir/scmroot/koji'...
$ git fetch origin 6e5faef31752c8a0af89d18515d319350b618ded:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/koji
 * [new ref]         6e5faef31752c8a0af89d18515d319350b618ded -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e5faef Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild