$ git clone -n https://src.fedoraproject.org/rpms/bcachefs-tools.git /var/lib/mock/f42-build-3280213-41340/root/chroot_tmpdir/scmroot/bcachefs-tools
Cloning into '/var/lib/mock/f42-build-3280213-41340/root/chroot_tmpdir/scmroot/bcachefs-tools'...
$ git fetch origin b5b46f78d2ea36ac020d6f22e2780d2723733f22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bcachefs-tools
 * [new ref]         b5b46f78d2ea36ac020d6f22e2780d2723733f22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5b46f7 Drop 32-bit architectures as they FTBFS on the Rust parts