tail: Support -F option to follow on file removal/truncation about serenity HOT 6 OPEN

I had some problems in getting --follow=name to work. The --retry part I had already, but I switched to a few other flags. So if you have a good idea how to solve that part, go for it.

See here: fdellwing@a28ae5f

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Our FileWatcher does currently not register a truncate. Imho a truncate should trigger a ContentModified event, but it does not. How are we notifying the FileWatcher about a new event currently?

Also the -F flag has nothing to do with truncation in GNU (coreutils). It changes the follow mode from fd based to name based. So if the file is moved away, tries to reopen the file (-> logrotate). Truncation is supported in normal -f mode.

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I have solved the truncation part.

I'll now look into implementing --retry and --follow=name (which are both combined in -F).

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@fdellwing Are you still working on this or can I take this issue?

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--follow=name

Aren't we taking the file name from the positional arg?

It is mode of following. Got it

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It is mode of following. Got it

Yes. It is used in -F to actually keep following a file by name if the original opened file is moved away. By default we keep following the original file as we use the fd.

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