Seems that I made an assumption that xar would have been installed in the ubuntu image as well 😅. Perhaps this functionality is too narrow to include in this package?

Edit: As there are windows-only extractors already present, I think this should be fine.

Adding Eric for his thoughts. Caution that there is a binary in this PR.

I think it's fine to have OS specific variants since some tool installers expose archives in various formats per OS. Curious, was there a specific tool / installer that exposed the tool via a xar that your were interested in writing a setup action for? The reason I ask, is I'm up for taking the functionality as long as there's a benefit trading off the maintenance and cost going forward ...

Sure! I use this in my setup swift action. The feature in question is used to unpack official swift pkg archives from swift.org. I opted to just copy the required function in there for now.

... although we'd ❤️ to take the contribution from you @fwal . Do you have time? No rush on our side.

Thanks for the feedback! I’ll address everything during next week as it’s holiday here 🇸🇪
Feel free to commit if you can’t wait 🙂

Ready for you, @thboop & @bryanmacfarlane.

Thanks for the contribution! Going to release this in 1.6.0! https://github.com/actions/toolkit/pull/519/files