$ git clone -n https://src.fedoraproject.org/rpms/rust-timebomb.git /var/lib/mock/f40-build-2659146-66918/root/chroot_tmpdir/scmroot/rust-timebomb
Cloning into '/var/lib/mock/f40-build-2659146-66918/root/chroot_tmpdir/scmroot/rust-timebomb'...
$ git fetch origin 4f34d9a9576d4749d04c9d85a7f255de5496b2e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-timebomb
 * [new ref]         4f34d9a9576d4749d04c9d85a7f255de5496b2e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f34d9a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild