github
html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | issue | performed_via_github_app |
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https://github.com/simonw/datasette/issues/1836#issuecomment-1271003212 | https://api.github.com/repos/simonw/datasette/issues/1836 | 1271003212 | IC_kwDOBm6k_c5LwfhM | 536941 | 2022-10-07T01:52:04Z | 2022-10-07T01:52:04Z | CONTRIBUTOR | and if we try immutable mode, which is how things are opened by `datasette inspect` we duplicate the files!!! ```python # test_sql_immutable.py import sqlite3 import sys db_name = sys.argv[1] conn = sqlite3.connect(f'file:/app/{db_name}?immutable=1', uri=True) cur = conn.cursor() cur.execute('select count(*) from filing') print(cur.fetchone()) ``` | { "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0 } |
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https://github.com/simonw/datasette/issues/1836#issuecomment-1270992795 | https://api.github.com/repos/simonw/datasette/issues/1836 | 1270992795 | IC_kwDOBm6k_c5Lwc-b | 536941 | 2022-10-07T01:29:15Z | 2022-10-07T01:50:14Z | CONTRIBUTOR | fascinatingly, telling python to open sqlite in read only mode makes this layer have a size of 0 ```python # test_sql_ro.py import sqlite3 import sys db_name = sys.argv[1] conn = sqlite3.connect(f'file:/app/{db_name}?mode=ro', uri=True) cur = conn.cursor() cur.execute('select count(*) from filing') print(cur.fetchone()) ``` that's quite weird because setting the file permissions to read only didn't do anything. (on reflection, that chmod isn't doing anything because the dockerfile commands are run as root) | { "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0 } |
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https://github.com/simonw/datasette/issues/1836#issuecomment-1270988081 | https://api.github.com/repos/simonw/datasette/issues/1836 | 1270988081 | IC_kwDOBm6k_c5Lwb0x | 536941 | 2022-10-07T01:19:01Z | 2022-10-07T01:27:35Z | CONTRIBUTOR | okay, some progress!! running some sql against a database file causes that file to get duplicated even if it doesn't apparently change the file. make a little test script like this: ```python # test_sql.py import sqlite3 import sys db_name = sys.argv[1] conn = sqlite3.connect(f'file:/app/{db_name}', uri=True) cur = conn.cursor() cur.execute('select count(*) from filing') print(cur.fetchone()) ``` then ```docker RUN python test_sql.py nlrb.db ``` produced a layer that's the same size as `nlrb.db`!! | { "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0 } |
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https://github.com/simonw/datasette/issues/1836#issuecomment-1270936982 | https://api.github.com/repos/simonw/datasette/issues/1836 | 1270936982 | IC_kwDOBm6k_c5LwPWW | 536941 | 2022-10-07T00:52:41Z | 2022-10-07T00:52:41Z | CONTRIBUTOR | it's not that the inspect command is somehow changing the db files. if i set them to only read-only, the "inspect" layer still has the same very large size. | { "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0 } |
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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` | { "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0 } |
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