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vasi avatar vasi commented on July 20, 2024

So this actually happens on archive creation, not on listing. Here's why:

OS X has a bunch of special file attributes like resource forks and Finder Info, that aren't easily tar-able. So bsdtar (the default on OS X) uses the copyfile() API to grab that extra data in AppleDouble format, and stores it as a ._ file. Eg, if you have a file called "foo" with a resource fork, bsdtar will store a "._foo" member and then "foo".

This is pretty annoying for pixz! Listing the tarball would include all sorts of extra ._ files, and extracting a single file would strip it of its special attributes. So I chose the solution of treating a ._ file as part of the following file, which works in almost all cases. Obviously it's not perfect though, such as if you really have files starting with ._ .

Here are some potential solutions:

  • Have a flag to enable/disable the special ._ handling
  • Automatically disable ._ handling on non-Mac platforms
  • Always store ._ files, but then use special code for listing/extraction to ignore it.

Do you have a preference among them? Why do you have ._ files lying around, anyhow?

from pixz.

dizi42 avatar dizi42 commented on July 20, 2024

Thanks for the info. I didn't know OS X did that. That makes sense. I share files with people who use Windows, OS X and Linux. It looks like all the files not being listed are from folders that have been extracted and re-archived through an Apple PC at some point. Also, I haven't intentionally named anything that starts with ._.

I guess these files are useless on PCs not running OS X. As for a preference then I'd like a flag. You can leave the the current behavior as the default.

from pixz.

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