$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-big-array.git /var/lib/mock/f40-build-2130917-50793/root/chroot_tmpdir/scmroot/rust-serde-big-array
Cloning into '/var/lib/mock/f40-build-2130917-50793/root/chroot_tmpdir/scmroot/rust-serde-big-array'...
$ git fetch origin c618c63b5ba741788b016c0f3a613745bbd9a8a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-big-array
 * [new ref]         c618c63b5ba741788b016c0f3a613745bbd9a8a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c618c63 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild