$ git clone -n https://src.fedoraproject.org/rpms/rust-json.git /var/lib/mock/f40-build-2082573-49850/root/chroot_tmpdir/scmroot/rust-json
Cloning into '/var/lib/mock/f40-build-2082573-49850/root/chroot_tmpdir/scmroot/rust-json'...
$ git fetch origin 88bfc2e83642aebdd381ec9d9e8864c3ffa986a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-json
 * [new ref]         88bfc2e83642aebdd381ec9d9e8864c3ffa986a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88bfc2e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild