$ git clone -n https://src.fedoraproject.org/rpms/rust-json.git /var/lib/mock/f40-build-2713820-72197/root/chroot_tmpdir/scmroot/rust-json
Cloning into '/var/lib/mock/f40-build-2713820-72197/root/chroot_tmpdir/scmroot/rust-json'...
$ git fetch origin 2e5d407951d7fdaa9ff16b455326d4997371ee3d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-json
 * [new ref]         2e5d407951d7fdaa9ff16b455326d4997371ee3d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e5d407 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild