Not all .cargo/config settings are settable via environment variables

[dylanede]

For example, the directory for a source cannot be set via an environment variable, i.e.

[source.vendored-sources]
directory = "foo"

cannot be equivalently done via CARGO_SOURCE_VENDORED_SOURCES_DIRECTORY=foo, despite the docs suggesting otherwise.

Also see #3985.

[stale]

As there hasn't been any activity here in over 6 months I've marked this as stale and if no further activity happens for 7 days I will close it.

I'm a bot so this may be in error! If this issue should remain open, could someone (the author, a team member, or any interested party) please comment to that effect?

The team would be especially grateful if such a comment included details such as:

• Is this still relevant?
• If so, what is blocking it?
• Is it known what could be done to help move this forward?

Thank you for contributing!

(The cargo team is currently evaluating the use of Stale bot, and using #6035 as the tracking issue to gather feedback.)

If you're reading this comment from the distant future, fear not if this was closed automatically. If you believe it's still an issue please leave a comment and a team member can reopen this issue. Opening a new issue is also acceptable!

[ehuss]

Closing in favor of #5416 which has more details.