Archive::Tar directory permissions

LiveandLearn2021 has asked for the wisdom of the Perl Monks concerning the following question:

Hello all, I am trying to determine if I'm encountering a bug or expected behavior with Archive::Tar. I've noticed that if I archive a directory such as /usr/include/sys/*.h that permissions are retained only for files underneath the sys directory. The permissions for /usr/include/sys change to the user that is extracting the files, including root. If the directory(/usr/include/sys) is owned by someone other than root it is not retained even if root does the extraction. If I use tar standalone to archive the directory then the permissions are retained for all directories. Is this to be expected? Additionally I've noticed that I cannot archive named pipes at all. The process will attempt to open the pipe and remain hung waiting on a response. This is the basic code I am using.

   use Archive::Tar;

   $tar = Archive::Tar->new();
   $tar->add_files(<"/usr/include/sys/*.h">) or die("Failed $!\n");
   $tar->write("files.tar") or die("Failed $!\n");
[download]

These are the permissions on the original directories: ls -ld /usr drwxr-xr-x 54 root sys 69 Apr 9 2018 /usr ls -ld /usr/include drwxr-xr-x 117 root bin 436 Sep 25 22:10 /usr/include ls -ld /usr/include/sys drwxr-xr-x 25 root bin 628 Sep 25 22:09 /usr/include/sys When I extract the archive(as root) generated from my code I see these permissions: ls -ld usr drwxr-xr-x 3 root root 512 Jan 20 13:06 usr ls -ld usr/include drwxr-xr-x 3 root root 512 Jan 20 13:06 usr/include ls -ld usr/include/sys drwxr-xr-x 2 root root 11776 Jan 20 13:07 usr/include/sys Thank you for any assistance!

Comment on Archive::Tar directory permissions Download Code

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Re: Archive::Tar directory permissions by kcott (Archbishop) on Jan 20, 2022 at 22:14 UTC
G'day LiveandLearn2021, Welcome to the Monastery. "I am trying to determine if I'm encountering a bug or expected behavior with Archive::Tar." I'd say that's expected behaviour. In "Archive::Tar - $Archive::Tar::SAME_PERMISSIONS" it says "The default is 1 for the root user and 0 for normal users.". [It's good that you've wrapped your code in `<code>...</code>` tags. Please also do this for any data and output (including exception messages). In this instance, your `ls` output is very difficult to read. Thankyou.] — Ken	[reply] [d/l] [select]
Re^2: Archive::Tar directory permissions by LiveandLearn2021 (Initiate) on Jan 24, 2022 at 14:03 UTC
Thank you all for the suggestion and tips!	[reply]
Re: Archive::Tar directory permissions by Fletch (Bishop) on Jan 20, 2022 at 19:35 UTC
The bits on `$Archive::Tar::CHOWN`, `::CHMOD`, and `SAME_PERMISSIONS` in the Archive::Tar documentation may be relevant. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l] [select]
Re: Archive::Tar directory permissions by talexb (Chancellor) on Jan 21, 2022 at 16:18 UTC
A formatting note for your post: you managed to wrap your code in code tags, but not the directory listing; the preview should have shown you that. The latter part of your post should like this: These are the permissions on the original directories: `ls -ld /usr drwxr-xr-x 54 root sys 69 Apr 9 2018 /usr ls -ld /usr/include drwxr-xr-x 117 root bin 436 Sep 25 22:10 /usr/include ls -ld /usr/include/sys drwxr-xr-x 25 root bin 628 Sep 25 22:09 /usr/include/sys` [download] When I extract the archive(as root) generated from my code I see these permissions: `ls -ld usr drwxr-xr-x 3 root root 512 Jan 20 13:06 usr ls -ld usr/include drwxr-xr-x 3 root root 512 Jan 20 13:06 usr/include ls -ld usr/include/sys drwxr-xr-x 2 root root 11776 Jan 20 13:07 usr/include/sys` [download] Thank you for any assistance! Do you see how this makes your question clearer? Alex / talexb / Toronto Thanks PJ. We owe you so much. Groklaw -- RIP -- 2003 to 2013.	[reply] [d/l] [select]