$ git clone -n https://src.fedoraproject.org/rpms/rust-primal-sieve.git /var/lib/mock/f40-build-2655861-66912/root/chroot_tmpdir/scmroot/rust-primal-sieve
Cloning into '/var/lib/mock/f40-build-2655861-66912/root/chroot_tmpdir/scmroot/rust-primal-sieve'...
$ git fetch origin 4a4fdafcf81c11dcce50b1ea610473df26d13cd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-primal-sieve
 * [new ref]         4a4fdafcf81c11dcce50b1ea610473df26d13cd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a4fdaf Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild