Spurious warning 'Ignoring unknown extended header keyword' when unpacking tarball

[jkeenan]

Today I had occasion to use perlbrew to upgrade my regular perl installation to 5.42.0 and then to install hundreds of modules against 5.42.0 via perlbrew clone-modules. perlbrew uses cpanm under the hood. In the course of watching cpanm I noticed the following:

-> Working on Mojolicious
Fetching http://www.cpan.org/authors/id/S/SR/SRI/Mojolicious-9.41.tar.gz ... OK
/usr/bin/tar: Ignoring unknown extended header keyword 'LIBARCHIVE.xattr.com.apple.provenance'
/usr/bin/tar: Ignoring unknown extended header keyword 'LIBARCHIVE.xattr.com.apple.provenance'
...

... where that Ignoring unknown extended header keyword was repeated many times.

This was annoying but not unprecedented. We experienced a similar problem with CPAN distribution Path-Tiny earlier this month. The remedy proposed for the problem by @karenetheridge:

This should be fixed by upgrading to Dist::Zilla 6.033, or by installing Archive::Tar::Wrapper.

You can also explore unpacking and then re-packing the tarball with a command like make dist.

Please issue a new CPAN release at your earliest convenience. Thanks.

[kraih]

We are not using Dist::Zilla. I have tried a bunch of env vars to resolve the issue, but nothing has worked so far.

[karenetheridge]

The relevant commit in Dist::Zilla says:

when creating a tarball with GNU tar, use --format=ustar to avoid xattrs and other problems sometimes related to macOS