Unable to select a specific ruby version if config contains a different version about mise

[jdx]

Run ruby -v. Output is ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin23] - still system ruby

Because mise shell is a shell function that sets environment variables. A CLI cannot do that.

If I want to use some other ruby version just for several commands, I don't want to change the value in config.

that's what mise shell is for. mise needs to change something (an env var or config file) so it knows which version to use.

[jdx]

Now try to select a different ruby version in mise. After the change, it changes back to the version from the config.

I don't know what this means. Are you talking about mise use? If so, .mise.toml files take precedence over legacy config files like .ruby-version.

[DmitryPogrebnoy]

It is more about mise shell. Let me explain it in more detail. The same steps work also for .mise.toml files, let suppose that we have .mise.toml for simplicity.

Complete steps for the reproduction:

1. Install [email protected] in mise.
2. Create empty directory.
3. Create .mise.toml file with content 3.2.0 in the directory from the previous step.
4. Open that directory in the console.
5. Run ruby -v. Output is ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin23] - system ruby.
6. Run mise list ruby. Output is:

Plugin  Version  Config Source                     Requested
ruby    3.2.0    ~/Desktop/mise_example/.mise.toml 3.2.0    
ruby    3.3.0                                                                                                                             

So the version is automatically selected by 3.2.0. because it is stated in the config file. It is expected.
Now suppose you would like to use some other version of ruby in the console. Then your next step is the following:
7. Run /Users/dmitry.pogrebnoy/.local/bin/mise shell [email protected].
On that step I expect that now I have ruby 3.3.0 enabled. Let's check:
8. Run ruby -v. Output is ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin23] - still system ruby.
9. But! If I call mise shell [email protected], then the version will change to 3.3.0.
10. Let's check. Run ruby -v. Output is ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23].

Could you please explain why it works as it is? I expect that it should work the same in both cases.

[DmitryPogrebnoy]

@jdx Also, some kind of a related question is why mise use ruby@<something> changes not only the currently selected ruby version, but also a value in .mise.toml config file? If I want to use some other ruby version just for several commands, I don't want to change the value in config.

[DmitryPogrebnoy]

Thank you for the clarification!