[tor-bugs] #26497 [Core Tor/Tor]: set CARGO_HOME correctly or stop using it

[Tor Bug Tracker & Wiki]

#26497: set CARGO_HOME correctly or stop using it
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     Reporter:  catalyst      |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  rust, tor-ci
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 It looks like we set `CARGO_HOME` incorrectly for invocations of both
 `cargo build` and `cargo test`.  The `cargo build` invocations work
 because we first `cd` to the directory containing the `.cargo` directory.
 The `cargo test` invocations don't work for out-of-source-tree builds.
 #26455 contains a more minimal fix.

 The setting of `CARGO_HOME` is redundant if we `cd` to the correct
 directory first.  Or we could stop changing directories and instead set
 `CARGO_HOME` correctly.  We probably shouldn't do both because it's
 confusing and possibly inconsistent.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26497>
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