[bug] When TERM is set to xterm, colors are not displaying properly

[lunrenyi]

• I'm being used within a clean Ubuntu Docker image environment.

[jnd-au]

What is your real TERM in which you are running docker? Use -e TERM to provide your terminal type to docker. Otherwise, https://github.com/muesli/termenv detects the default value TERM=xterm as a generic non-colour terminal because the docker container doesn’t know your real environment.

[lunrenyi]

In my Mac environment, TERM=xterm tz displays correctly, but it doesn't show up properly within a Docker Ubuntu image.

• macOS
  

• docker Ubuntu image
  

[jnd-au]

This suggests your macOS terminal environment has additional environment variables set (termenv detects these). Whereas docker run wipes the environment information by default, so differences should be expected. Normally, TERM=xterm tz on macOS is black-and-white, same as Docker.

[jnd-au]

Also, which version of tz -v are you using in each environment? (E.g. macOS Homebrew currently has version 0.7.0, but I’m not sure what you’re using within Docker.)

[lunrenyi]

Also, which version of tz -v are you using in each environment? (E.g. macOS Homebrew currently has version 0.7.0, but I’m not sure what you’re using within Docker.)

They are all version 0.7.0, sourced from https://github.com/oz/tz/releases/tag/v0.7.0

[jnd-au]

I also have 0.7.0 and it works as expected: uncoloured with TERM=xterm, 16-colour with TERM=xterm-colour, and 256-colour with TERM=xterm-256color. The differences in your screenshots are probably due to the discrepancies between your environments. If you align your environments, you should see the same.

[jnd-au]

Hi @lunrenyi if you’re using iTerm, it sets some environment variables like COLORTERM=truecolor and TERM=xterm-256color which are different inside the Ubuntu Docker container, hence the discrepancy. If you pass your COLORTERM to docker, it will override TERM=xterm for colour detection, and tz will give you the result you expect: docker run -e COLORTERM .... Regards