$ git clone -n https://src.fedoraproject.org/rpms/rust-alloc-stdlib.git /var/lib/mock/f40-build-2659247-66918/root/chroot_tmpdir/scmroot/rust-alloc-stdlib
Cloning into '/var/lib/mock/f40-build-2659247-66918/root/chroot_tmpdir/scmroot/rust-alloc-stdlib'...
$ git fetch origin b1a0323671e5c269172cb158271b65944a401857:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-alloc-stdlib
 * [new ref]         b1a0323671e5c269172cb158271b65944a401857 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1a0323 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild