[Modules] New feature: Initialize environment variables on first modification

[Xavier D. v. lists.hpsf.i. <xav...@li...>]

Dear All,

It is now possible to define default values for path-like environment
variables (such as MANPATH) before they're first updated, ensuring system
defaults are preserved.

This feature is based on the new "init_envvars" configuration option.

For example, with the following configuration:

$ module config init_envvars MANPATH=

loading a module that prepends a directory to MANPATH:

prepend-path MANPATH /opt/pkg/man

will keep a colon character at the end of MANPATH

$ echo $MANPATH
/opt/pkg/man:


Learn more at
https://modules.readthedocs.io/en/latest/MIGRATING.html#initialize-environment-variables-on-first-modification

Best regards,
Xavier


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