[tbb-bugs] #33939 [Applications/Tor Browser]: Decide which components of Fenix to rip out, disable, or use

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#33939: Decide which components of Fenix to rip out, disable, or use
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 Reporter:  gk                                |          Owner:  tbb-team
     Type:  task                              |         Status:  new
 Priority:  High                              |      Milestone:
Component:  Applications/Tor Browser          |        Version:
 Severity:  Normal                            |     Resolution:
 Keywords:  tbb-mobile, TorBrowserTeam202006  |  Actual Points:
Parent ID:  #33661                            |         Points:
 Reviewer:                                    |        Sponsor:
                                              |  Sponsor58-must
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Comment (by gk):

 Replying to [comment:16 sysrqb]:
 > Replying to [comment:14 gk]:
 > > Replying to [comment:13 sysrqb]:
 > > > Replying to [comment:3 sysrqb]:
 > > > > The follow list partitions the dependencies into "include",
 "exclude", "disable", and "must-audit" sets
 > > > >
 > > > > "Must Audit" includes dependencies that we could allow depending
 on their implementation
 > > > >
 > > > > "Disable" includes dependencies that we probably do not want and
 we should always use "Dummy" implementations
 > > > >
 > > > > "Disable" and "Exclude" may merge into a single set.
 > > > >
 > > > > === Include ===
 > > > > {{{
 > > > > > # GeckoView
 > > > > > mozilla_browser_engine_gecko_nightly -> org.mozilla.components
 :browser-engine-gecko-nightly
 > > > > > mozilla_browser_engine_gecko_beta -> org.mozilla.components
 :browser-engine-gecko-beta
 > > >
 > > > #34177
 > >
 > > One thing I've been thinking about the requirement for having multiple
 engines included at the same time when building is how to make sure we
 avoid that when actually building releases/alphas. I am not sure yet how
 to do that in the best way. I started playing with ripping things our in
 `android-components` so that we e.g. don't require some `gecko_nightly`
 code anymore. But it feels a bit awkward so far.
 > >
 > > The reason for doing that is tha I don't want to land in a situation
 that due to a bug not-proxy-safe and not audited nightly code is suddenly
 used in our builds. That's not a problem with geckoview per se as there is
 a branch per series (`mozilla-central` -> `gecko_nightly`, `mozilla-beta`
 -> `gecko_beta` etc.) but that's not the case anymore for those
 dependencies in `android-components` and `fenix`.
 >
 > Do you suggest we only keep `beta` and `production`? Should we simply
 carry a patch that deletes/comments-out the geckoNightly variant, so it
 can never be built accidentally?

 I am not sure yet which approach we should take. I've not looked close
 enough to decide which of several potential approaches would be best.
 However, what I like to see is either geckoFoo not being around when
 building geckoBar OR using geckoFoo when building geckoBar failing hard OR
 removing the dependencies that rope in geckoFoo when building geckoBar
 OR... So, yeah, it should not be possible to use geckoFoo accidentally (be
 it due to a bug or some other issues) when building geckoBar (using "Foo"
 and "Bar" here because that holds for any of the Nightly, Beta, and
 Production variant).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33939#comment:17>
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