Feature request: Export as .tar.xz

[AnyOldName3]

7zip is packaged differently on different Linux distros, and ends up available via different command names as a result (i.e. it's not always 7z). .zip archives generally end up significantly larger, and exporting as a raw directory and then explicitly archiving it via another command is extra hassle.

It would therefore be nice to be able to export a .tar.xz tarball, and benefit from the wide availability of tar and the same compression effectiveness as .7z.

This looks to be a pretty simple change - the cmake -E tar command that's used to make .zip and .7z archives can make .tar.xz, too. Right now it's used like

cmake -E tar cf archive_path.7z --format=7zip -- path/to/directory

and

cmake -E tar cf archive_path.zip --format=zip -- path/to/directory

and a .tar.xz can be made with

cmake -E tar cfJ archive_path.tar.xz -- path/to/directory

optionally with --format=gnutar if that makes things easier.

[autoantwort]

This would only require a relative new cmake (3.24) to have --touch, otherwise this can be done manually after the extraction (and vcpkg uses a new version of cmake anyways).

[autoantwort]

And for decompression one can read the first few bytes of a file to know how the file was compressed to call the right tool to decompress it.

[AnyOldName3]

This doesn't need CMake 3.24, as the -J option that this requires was added much earlier with CMake 3.1. I don't know why you're mentioning --touch at all as that's an extraction flag, and this is about creating the archive. I also don't know why you're mentioning looking at the file header to see how to decompress it given that the problem being discussed here is that none of the archive formats available are especially suitable for Linux. Did you perhaps reply to the wrong issue?