# The 3MB guess is semi-arbitrary, but we've been informed that
# Lustre, for example, uses 1MB, so guess higher than that, at least.
block_size=$(bup-python -c \
- "import os; print getattr(os.stat('.'), 'st_blksize', 0) or $mb * 3") \
+ "import os; print(getattr(os.stat('.'), 'st_blksize', 0)) or $mb * 3") \
|| exit $?
data_size=$((block_size * 10))
readonly block_size data_size