issue_comments: 1270923537

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https://github.com/simonw/datasette/issues/1836#issuecomment-1270923537 https://api.github.com/repos/simonw/datasette/issues/1836 1270923537 IC_kwDOBm6k_c5LwMER 536941 2022-10-07T00:46:08Z 2022-10-07T00:46:08Z CONTRIBUTOR

i thought it was maybe to do with reading through all the files, but that does not seem to be the case

if i make a little test file like:

```python

test_read.py

import hashlib import sys import pathlib

HASH_BLOCK_SIZE = 1024 * 1024

def inspect_hash(path): """Calculate the hash of a database, efficiently.""" m = hashlib.sha256() with path.open("rb") as fp: while True: data = fp.read(HASH_BLOCK_SIZE) if not data: break m.update(data)

return m.hexdigest()

inspect_hash(pathlib.Path(sys.argv[1])) ```

then a line in the Dockerfile like

docker RUN python test_read.py nlrb.db && echo "[]" > /etc/inspect.json

just produes a layer of 3B

 
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