$ git clone -n https://src.fedoraproject.org/rpms/module-build.git /var/lib/mock/f39-build-1592764-38313/root/chroot_tmpdir/scmroot/module-build
Cloning into '/var/lib/mock/f39-build-1592764-38313/root/chroot_tmpdir/scmroot/module-build'...
$ git fetch origin 596add74261d61c4bc7f5abe9cc52c00a51a837e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/module-build
 * [new ref]         596add74261d61c4bc7f5abe9cc52c00a51a837e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 596add7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild