$ git clone -n https://src.fedoraproject.org/rpms/bcachefs-tools.git /var/lib/mock/f40-build-2431220-60626/root/chroot_tmpdir/scmroot/bcachefs-tools
Cloning into '/var/lib/mock/f40-build-2431220-60626/root/chroot_tmpdir/scmroot/bcachefs-tools'...
$ git fetch origin 343e7510ed4b0f0c9c871374bb6ab22d2acbfa2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bcachefs-tools
 * [new ref]         343e7510ed4b0f0c9c871374bb6ab22d2acbfa2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 343e751 Update to 1.6.3