$ git clone -n https://src.fedoraproject.org/rpms/ristretto.git /var/lib/mock/f39-build-1591742-38297/root/chroot_tmpdir/scmroot/ristretto
Cloning into '/var/lib/mock/f39-build-1591742-38297/root/chroot_tmpdir/scmroot/ristretto'...
$ git fetch origin f81165f004ef4ba8a6cbc197970a32adce8e23c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ristretto
 * [new ref]         f81165f004ef4ba8a6cbc197970a32adce8e23c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f81165f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild