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assistant: when an add fails, requeue it for later

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See analysis in bug report for one way this could happen.
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Joey Hess 2013-04-23 18:23:04 -04:00
parent 53674cc3fd
commit ca72b1ac7b
2 changed files with 26 additions and 3 deletions
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22
doc/bugs/assistant_does_not_warn_on_files_it_failed_to_add.mdwn
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@ -22,3 +22,25 @@ OS: Arch Linux
Please provide any additional information below.
The assistant in this case is being used as nothing more than a way for me to see which files have been added (--verbose, --foreground and --debug with 'watch' outputs nothing..). No remotes or anything like that.
> I have made the assistant re-queue any file that it fails to add,
> so it will retry it later. Typically within a few seconds. [[done]]
>
> I have only been able to think of one scenario in which this could
> happen. It's pretty unusual:
>
> * Something writes to a file, and closes it.
> * Assistant sees file has no writers, and locks it down in preparation
> to add it.
> * Something then re-opens the file to write to it some more.
> Note that it would seem to need to bypass permissions that prevent
> the file from being written to in order to do this. It makes a change
> to the file.
> * Assistant is checksumming file, reaches end, and detects it has been
> tampered with and gives up.
>
> I would still like more information about circumstances that
> cause this to happen, because while a possible scenario, the
> above is too weird to believe anyone could run into it.
>
> --[[Joey]]