$ git clone -n https://src.fedoraproject.org/rpms/copr-backend.git /var/lib/mock/f40-build-2271851-54898/root/chroot_tmpdir/scmroot/copr-backend
Cloning into '/var/lib/mock/f40-build-2271851-54898/root/chroot_tmpdir/scmroot/copr-backend'...
$ git fetch origin aeebd02be1e0a6ea899805556324767af2e555f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-backend
 * [new ref]         aeebd02be1e0a6ea899805556324767af2e555f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aeebd02 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild