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I've got a file that contains information I need to let some apps read sometimes, but would generally prefer it's not accessed without me knowing about it.

How can I get the file descriptor open operation to prompt me for confirmation before it succeeds?

I could write my own file system emulator and mount it probably, but that sounds like too much.

Are there existing tools for that?

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  • "I could write my own file system emulator and mount it probably" - a FUSE plug-in might work there too. Commented Jul 12, 2021 at 19:55

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You could monitor access but not deny it with something like inotifywait.

You could deliver the file contents to stdout by means of a small sudo-controlled script that mediated access to the restricted file.

I know of nothing that will do precisely what you want, but the beauty here is that you can build something similar to your required tool with existing utilities.

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