tox.ini > [testenv:foobar] section > deps: How to create a hook to dynamic provide/append values ​​for it before install the python package?

[luzfcb]

I need to create a plugin to include/change dependencies in some specific testenv, and these dependencies aren't static.

I'd like to know if there's a hook that can be used to provide valid values ​​for deps, or if there's a good hook that would be useful to implement this feature, and what are the important atributes or function that need to implements/override.

Also, is there any documentation on how to modify the deps processing behavior and docs about the hook execution ordering?

[gaborbernat]

The relevant plugin hooks for this are:

• tox_add_env_config — called when environment configuration is being built. You can use this to register custom config keys or modify existing ones.
• tox_on_install — called before executing an installation command. Receives tox_env, arguments, section, and of_type parameters, allowing you to intercept and modify what gets installed.

There is no dedicated hook for modifying deps directly — you'd use tox_add_env_config to register your config and tox_on_install to inject additional dependencies at install time.

The hook execution order follows the plugin loading order (entry points). See the plugin spec at src/tox/plugin/spec.py for the full list of available hooks and their signatures.

For a practical example of a plugin that modifies dependencies, you can look at existing tox plugins on PyPI that extend the dependency handling.