Set WP_CLI_PACKAGES_DIR in config file

[Kilbourne]

Hi,
I'd like to set WP_CLI_PACKAGES_DIR env var from the wp-cli config file ( ex. wp-cli.yaml).
The use case is hosting platform which don't allow to set environment variable ( or make it difficult)

[janw-me]

Creating a wp-cli.yml config should be possible. The main place the variable is used is here.

Will also need updated documentation and tests. a possible good-first-issue ?

[schlessera]

We could have an env key under the special _ key that can be used in the config file like so:

_:
    env:
        WP_CLI_PACKAGES_DIR: /home/user/.wp-cli/packages

[janw-me]

So I've taken a, a look at it.
And the best way it to create a extra config-spec, specifically for the Global variables.
And while we are at it, allow all these variables (that are possible) to be overwritten in this config.
As all entries in the yml are white listed in \WP_CLI\Configurator::merge_yml()

So it's a bit more work then expected at first sight, but this is the best approach IMO.

I'd love to hear other opinions.

[danielbachhuber]

Another option to consider: support for .env files. Would need some discussion around a proposed approach.