Re: some permissions failures with Archive::Tar::Wrapper

Hey David,

Em 04/06/2024 17:07, David Cantrell escreveu:
> busybox tar doesn't mention -p in its docs so I don't think it's fair 
> to say that it's broken. It just doesn't support that option.

I got something different here, maybe is related to the version?

localhost:~$ tar --help
BusyBox v1.36.1 (2023-11-07 18:53:09 UTC) multi-call binary.

Usage: tar c|x|t [-ZzJjahmvokO] [-f TARFILE] [-C DIR] [-T FILE] [-X FILE] [LONGOPT]... [FILE]...

Create, extract, or list files from a tar file

     c    Create
     x    Extract
     t    List
     -f FILE    Name of TARFILE ('-' for stdin/out)
     -C DIR    Change to DIR before operation
     -v    Verbose
     -O    Extract to stdout
     -m    Don't restore mtime
     -o    Don't restore user:group
     -k    Don't replace existing files
     -Z    (De)compress using compress
     -z    (De)compress using gzip
     -J    (De)compress using xz
     -j    (De)compress using bzip2
     --lzma    (De)compress using lzma
     -a    (De)compress based on extension
     -h    Follow symlinks
     -T FILE    File with names to include
     -X FILE    File with glob patterns to exclude
     --exclude PATTERN    Glob pattern to exclude
     --overwrite        Replace existing files
     --strip-components NUM    NUM of leading components to strip
     --no-recursion        Don't descend in directories
     --numeric-owner        Use numeric user:group
     --no-same-permissions    Don't restore access permissions

Nothing there about "-p", but "--no-same-permissions" tells me it should 
do it by default, which doesn't work either.

After some effort to have manpages installed on Alpine, I got this:

        -p, --preserve-permissions, --same-permissions
               Set permissions of extracted files to those recorded in the
               archive (default for superuser).

Then I tried all the three variations, with the following results:

  * -p and --same-permissions are ignored
  * --preserve-permissions is not accepted as a valid argument

localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ tar --same-permissions -xvf t/data/bar.tar
bar/
bar/bar.dat
bar/foo.dat
localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ ls -l bar/
total 8
-rw-r--r--    1 goku     goku            11 Jul 24  2005 bar.dat
-rw-r--r--    1 goku     goku            11 Jul 24  2005 foo.dat
localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ rm -rf bar/
localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ tar --preserve-permissions -xvf t/data/bar.tar
tar: unrecognized option: preserve-permissions
BusyBox v1.36.1 (2023-11-07 18:53:09 UTC) multi-call binary.

Usage: tar c|x|t [-ZzJjahmvokO] [-f TARFILE] [-C DIR] [-T FILE] [-X FILE] [LONGOPT]... [FILE]...

localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ tar -x -v -p -f t/data/bar.tar
bar/
bar/bar.dat
bar/foo.dat
localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ ls -l bar/
total 8
-rw-r--r--    1 goku     goku            11 Jul 24  2005 bar.dat
-rw-r--r--    1 goku     goku            11 Jul 24  2005 foo.dat

As a reminder, Archive::Tar::Wrapper is expecting to get the group with 
"rw" permissions:

localhost:~/.cpan/build/Archive-Tar-Wrapper-0.40-0$ tar -tvf t/data/bar.tar
drwxrwxr-x mschilli/mschilli         0 2005-07-24 16:15:34 bar/
-rw-rw-r-- mschilli/mschilli        11 2005-07-24 16:15:27 bar/bar.dat
-rw-rw-r-- mschilli/mschilli        11 2005-07-24 16:15:34 bar/foo.dat