[tor-bugs] #12155 [Tor bundles/installation]: Support fully incremental TBB developer builds

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#12155: Support fully incremental TBB developer builds
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 Reporter:  mikeperry                 |          Owner:  erinn
     Type:  defect                    |         Status:  new
 Priority:  normal                    |      Milestone:
Component:  Tor bundles/installation  |        Version:
 Keywords:  gitian                    |  Actual Points:
Parent ID:                            |         Points:
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 We should figure out some way to make it less painful for newcomers to
 create dev builds for testing patches against TBB, especially for Firefox.

 Right now, developing patches for TBB requires waiting for an end-to-end
 Gitian build. We added support for rebuilding only select components of
 the bundle, but we could take this a step further by allowing incremental
 builds without having to rebuild everything in a given component.

 There are several ways to accomplish this. The easiest will be if we allow
 partial rebuilds without preserving the reproducibility property. This
 will be the parent ticket for all manner of ways of doing this,
 reproducible or not.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12155>
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