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explain the OS source tree a bit further

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Daniel Micay 2019-04-25 23:59:25 -04:00
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<li><a href="https://github.com/GrapheneOS/branding_tools">Scripting for managing branding</a></li>
<li><a href="https://github.com/GrapheneOS/platform_manifest">Manifest for OS repositories</a></li>
</ul>
<p>The operating system includes hundreds of repositories. The manifest repository
references all of these. Most of these are used unmodified from the Android Open
Source Project (AOSP). A few dozen of the repositories are either forked from AOSP or
are unique to GrapheneOS.</p>
<p>The operating system source tree includes hundreds of repositories. Many of these
are only used for debugging, testing or development and are not actually part of what
gets used for building a production release. The manifest repository references all of
these. Most of these are used unmodified from the Android Open Source Project (AOSP).
A few dozen of the repositories including most of the core OS are either forked from
AOSP or are unique to GrapheneOS. The operating system has a unified build system, but
some components like Chromium are too complex to fit into it so they're included as
prebuilts instead of porting them to the AOSP build system. This is also done for
developer convenience and bootstrapping, to avoid needing to build all the native /
cross-compilation toolchains for each host and target platform combination, etc. The
prebuilts can all be built from source if desired. The build instructions will be
expanded to cover all of this in the future.</p>
<p>Chromium needs to be included in the GrapheneOS source tree as a prebuilt before
building. The build metadata is in the <a href="https://github.com/GrapheneOS/chromium_build">
chromium_build repository</a> and the GrapheneOS patches are in the