Docker needs sudo on Unices

[hongooi73]

Hi, I found your package from the rockerverse paper. Nice work!

One thing though: running docker typically requires sudo on Unix-based OSes, including Linux and Mac. I'll make a PR for this.

> list_images()
WARNING: Error loading config file: /home/hongo/.docker/config.json: stat /home/hongo/.docker/config.json: permission denied
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/images/json: dial unix /var/run/docker.sock: connect: permission denied
Error in gregexpr(pattern = "\\s\\s\\w", header)[[1]] :
  subscript out of bounds
In addition: Warning message:
running command 'docker image ls ' had status 1

[hongooi73]

It would probably also be better to use the processx package rather than system and system2. This provides a robust way to capture the result of the system call, and is platform-independent.

[thebioengineer]

Thanks for the feedback, I'll take a look at processx. I've never seen that before.

I obviously tested this on my windows machine, so I didnt need sudo. And in my past experience I did not need sudo when I was working on an opensuse server. However, that's not to say that is everyone's situation. Maybe a way for people to pass sudo passwords when necessary...

[hongooi73]

processx is used by devtools, so it's highly likely you've already got it installed.