[Bug 3140] support a token for XDG_RUNTIME_DIR

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3140

--- Comment #2 from Darren Tucker <dtucker at dtucker.net> ---
Created attachment 3375
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3375&action=edit
allow environment variables in path config keywords

This adds support for shell-style ${VAR} keyword expansions in config
keywords that take paths.  It applies on top of OpenBSD -current.  Your
use case would be something like this in ~/.ssh/config:

RemoteForward ${XDG_RUNTIME_DIR}/S.gpg-agent
${XDG_RUNTIME_DIR}/S.gpg-agent

There's a few potential problems with this:
 - the expansions are exclusively client side and I'm not sure the
server should ever do this type of expansion.
 - there'a existing environment variable support in IdentityAgent and
ForwardAgent which has a different, more limited format.  Right now the
patch supports both.  I think we'd be better off removing the old
format since having two is potentially confusing, but that's a user
visible potentially incompatible change.
 - I am unsure if this is generally worth the extra complexity and
maintenance or what the other OpenSSH maintainers will think of this.

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