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  • simonw · 3 ✖

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  • docker image is duplicating db files somehow · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
1272344884 https://github.com/simonw/datasette/issues/1836#issuecomment-1272344884 https://api.github.com/repos/simonw/datasette/issues/1836 IC_kwDOBm6k_c5L1nE0 simonw 9599 2022-10-08T15:41:28Z 2022-10-08T15:41:28Z OWNER

Lets switch to mode=ro when the inspect command runs, we can use this issue for that.

 
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 docker image is duplicating db files somehow 1400374908  
1271006020 https://github.com/simonw/datasette/issues/1836#issuecomment-1271006020 https://api.github.com/repos/simonw/datasette/issues/1836 IC_kwDOBm6k_c5LwgNE simonw 9599 2022-10-07T01:54:07Z 2022-10-07T01:54:07Z OWNER

Just overlapped with your comment here: https://github.com/simonw/datasette/issues/1836#issuecomment-1271003212 - which notes that opening with ?immutable=1 DOES seem to cause the file to be duplicated!

 
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 docker image is duplicating db files somehow 1400374908  
1271004167 https://github.com/simonw/datasette/issues/1836#issuecomment-1271004167 https://api.github.com/repos/simonw/datasette/issues/1836 IC_kwDOBm6k_c5LwfwH simonw 9599 2022-10-07T01:53:05Z 2022-10-07T01:53:05Z OWNER

Oh this is interesting!

Is your hunch here that running this line is causing the file to be stored as a second layer?

https://github.com/simonw/datasette/blob/5aa359b86907d11b3ee601510775a85a90224da8/datasette/utils/init.py#L399

I guess it's possible that running a non-read-only query against the database causes one or two bytes to be changed (maybe a transaction ID or similar?)

Modifying the inspect command to use ?mode=ro seems sensible to me. Except.... it should already be opening those files in immutable mode according to this line: https://github.com/simonw/datasette/blob/eff112498ecc499323c26612d707908831446d25/datasette/cli.py#L172-L173

Here's what opening as a immutables does:

https://github.com/simonw/datasette/blob/eff112498ecc499323c26612d707908831446d25/datasette/app.py#L258-L260

https://github.com/simonw/datasette/blob/eff112498ecc499323c26612d707908831446d25/datasette/database.py#L98

 
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 docker image is duplicating db files somehow 1400374908  

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