issues: 1426379903
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| 1426379903 | PR_kwDOBm6k_c5BtJNn | 1870 | don't use immutable=1, only mode=ro | 536941 | open | 0 | 6 | 2022-10-27T23:33:04Z | 2022-10-29T00:53:43Z | CONTRIBUTOR | simonw/datasette/pulls/1870 | Opening db files in immutable mode sometimes leads to the file being mutated, which causes duplication in the docker image layers: see #1836, #1480 That this happens in "immutable" mode is surprising, because the sqlite docs say that setting this should open the database as read only. https://www.sqlite.org/c3ref/open.html > immutable: The immutable parameter is a boolean query parameter that indicates that the database file is stored on read-only media. When immutable is set, SQLite assumes that the database file cannot be changed, even by a process with higher privilege, and so the database is opened read-only and all locking and change detection is disabled. Caution: Setting the immutable property on a database file that does in fact change can result in incorrect query results and/or [SQLITE_CORRUPT](https://www.sqlite.org/rescode.html#corrupt) errors. See also: [SQLITE_IOCAP_IMMUTABLE](https://www.sqlite.org/c3ref/c_iocap_atomic.html). Perhaps this is a bug in sqlite? <!-- readthedocs-preview datasette start --> ---- :books: Documentation preview :books:: https://datasette--1870.org.readthedocs.build/en/1870/ <!-- readthedocs-preview datasette end --> | 107914493 | pull | {"url": "https://api.github.com/repos/simonw/datasette/issues/1870/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | 0 |