add support to TarArchiver for more common compression suffixes

[toffaletti]

• include more suffixes for: gzip, bzip2, lzma, xz

Motivation:

Add support for compression algorithms that can achieve higher compression ratios than gzip.
Support another common extension for gzip as well.

Modifications:

I modified the list of supported extensions for the TarArchiver.

I researched various manpages to see what was commonly supported.

• The GNU tar manpage has the most extensive list of suffixes.
• FreeBSD tar supports most of what GNU tar does in terms of compression algorithms.
• OpenBSD tar doesn't support the a flag used for auto-compress which TarArchiver.compress uses ref. It also doesn't seem to have anything beyond gzip and bzip2 (no lzma or xz).
• NetBSD tar has gzip, bzip2, lzma, xz
• Windows tar.exe seems to be a port of BSD tar similar in support to NetBSD.
• macOS tar is an older FreeBSD tar, similar support to NetBSD.

Result:

More compression algorithms will be supported.

[toffaletti]

I wasn't sure about adding test files for all these extensions?

[toffaletti]

It wasn't clear to me whether "tar.gz" is really needed or if "gz" is good enough here? The tar commands don't seem to care:

 tar tzf test.gz | head
6.0.3-RELEASE_rhel_ubi9_x86_64.artifactbundle/
6.0.3-RELEASE_rhel_ubi9_x86_64.artifactbundle/6.0.3-RELEASE_rhel_ubi9_x86_64/
6.0.3-RELEASE_rhel_ubi9_x86_64.artifactbundle/info.json
6.0.3-RELEASE_rhel_ubi9_x86_64.artifactbundle/6.0.3-RELEASE_rhel_ubi9_x86_64/x86_64-unknown-linux-gnu/

[dschaefer2]

I wasn't sure about adding test files for all these extensions?

Tests would be extremely helpful. It's hard to know whether these things work or will stay working without them.

[MaxDesiatov]

Another thing to keep in mind that not all of these formats are supported by tar on all platforms that SwiftPM supports. We need to make sure that in case of unsupported formats appropriate diagnostic message is emitted to the user and that this support is detected correctly on a given platform.

[toffaletti]

Another thing to keep in mind that not all of these formats are supported by tar on all platforms that SwiftPM supports. We need to make sure that in case of unsupported formats appropriate diagnostic message is emitted to the user and that this support is detected correctly on a given platform.

Is there a canonical list of supported platforms and their versions?

[MaxDesiatov]

Is there a canonical list of supported platforms and their versions?

Yes, it's available at https://swift.org/install