[tor-bugs] #27130 [Core Tor/Tor]: rust dependency updating instructions don't work

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#27130: rust dependency updating instructions don't work
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 Reporter:  cyberpunks                           |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.3.9
 Severity:  Normal                               |     Resolution:
 Keywords:  rust, doc, 033-backport,             |  Actual Points:
  034-backport                                   |
Parent ID:                                       |         Points:
 Reviewer:  catalyst                             |        Sponsor:
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Comment (by catalyst):

 Replying to [comment:12 cyberpunks]:
 > Replying to [comment:11 catalyst]:
 > > I just tried it.  It looks like I have to run `cargo update` to update
 `Cargo.lock` to a newer version of `libc`, and `cargo vendor` doesn't try
 to change it.
 >
 > Did you make any crate actually require a newer version of libc? That's
 in the instructions as the first step.
 Thanks, that seems to have helped.
 >
 > > To add/remove/update dependencies, first add your dependencies into
 the appropriate *crate-level* `Cargo.toml`
 >
 > If dependencies are being updated, it would be because there's a reason
 for it and you now require a new minimum version, right?
 As [comment:8 teor mentioned above], what if an older version of a
 dependency had bugs or security vulnerabilities?  Then we might want the
 newest compatible version without explicitly bumping the minimum version
 in `Cargo.toml`.
 > Pushed a commit to maybe make the instructions a bit clearer.
 Thanks.  Could you please also explain why someone might want to manually
 edit versions in `Cargo.toml` versus running `cargo update`?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27130#comment:13>
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