$ git clone -n https://src.fedoraproject.org/rpms/rr.git /var/lib/mock/f38-build-side-42-init-devel-583473-26085/root/chroot_tmpdir/scmroot/rr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-583473-26085/root/chroot_tmpdir/scmroot/rr'...
$ git fetch origin 8e3b8a391496d2283e3a0b3764c6759a6cd7506b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rr
 * [new ref]         8e3b8a391496d2283e3a0b3764c6759a6cd7506b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e3b8a3 Fix FTBFS issue with gcc-13.