$ git clone -n https://src.fedoraproject.org/rpms/rust-block-buffer0.9.git /var/lib/mock/f40-build-2053799-49096/root/chroot_tmpdir/scmroot/rust-block-buffer0.9
Cloning into '/var/lib/mock/f40-build-2053799-49096/root/chroot_tmpdir/scmroot/rust-block-buffer0.9'...
$ git fetch origin 4bd774e37fb5b59ed42695f970459b01ff5251c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-block-buffer0.9
 * [new ref]         4bd774e37fb5b59ed42695f970459b01ff5251c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4bd774e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild