os/Chown

[leongross]

trafficstars

Add os.Chown()

[leongross]

To design meaningful test cases for chown, I think you would need multiple users with different uids and gids and a user who has permission to change ownership of a file to this, a super user. In my opinion, there are 2 ways to integrate this:

1. update the container image for the CI so that there are accounts with said properties
2. mocking the file system and permissions

The problem I see with solution 2 is that the implementation of chown relies on the syscall chown, so I wouldn't know how to mock that.

I would appreciate your input on that @rminnich

EDIT: Maybe I am mistaken but as I see it, golang does not do any of the described tests but checks for an error of an invalid gid, maybe this is the way to go here as well?

[leongross]

@deadprogram do you have an opinion on that?

[leongross]

@deadprogram

[leongross]

@rminnich

[deadprogram]

@leongross can you please rebase this PR against the latest dev? Thanks!

[leongross]

@deadprogram rebase done, but noq quite sure where the runtime panic originates. Do you know anything about this?

[leongross]

@deadprogram @aykevl

[deadprogram]

@leongross looks like some CI fails on this PR. You probably also need to rebase against latest dev.

[leongross]

The old errors should be fixed except for the ci (failing probably due to https://github.com/tinygo-org/tinygo/issues/4347). Could you review it? @deadprogram

[leongross]

@deadprogram I think this was the last fix now, mind to review?

[deadprogram]

Thanks for the additions @leongross and too @rminnich and @aykevl for review.

Now squash/merging.