dune-pkg: Print an error when dune is unable to decompress a tarball

[gridbugs]

Many opam packages have their source stored in a compress tarball, usually compressed with gzip or bzip2. When dune installs a package it uses tar (or bsdtar in some cases) to extract the archive, decompressing it first with the relevant tool if necessary (gunzip or bunzip2). If the relevant tool is not installed, the decompression will fail, however the details of the failure will not be shown to the user. It would be more helpful if the error message indicated the nature of the problem and suggested installing the relevant (de)compression tool.

[bximbo]

Hello @gridbugs . My name is Israel, an applicant for the Outreachy Internship. I am new to this project but I am a little familiar with OCaml. Can I have this issue assigned to me?

[kayodegigz]

Hello @gridbugs , my name is Kayode, an outreachy internship applicant. I'd like to work on this issue too

[gridbugs]

To clarify to the outreachy interns asking about this issue, I'm not going to assign anyone this issue as it's been comprehensively solved in #11560.

[bximbo]

Thank you very much @gridbugs

Is there a good first issue you can recommend or assign to me?

[gridbugs]

I won't choose one for you, but take a look at our good first issues.

[bximbo]

Thank you @gridbugs