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Refactor marker file logic #21182

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wants to merge 2 commits into from
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Refactor marker file logic #21182

wants to merge 2 commits into from

Commits on Feb 2, 2024

  1. Refactor marker file logic 

    Marker files today store all predeclared inputs as one hash (on the first line of the file), and then each recorded input as a following line in the `TYPE:KEY VALUE` format. This commit refactors the parsing/stringification logic of recorded inputs so that they're not all clumped in big methods in `RepositoryFunction`, to pave the way for more recorded input types (watching directories, etc) and more places to write recorded input data (for the true repo cache).

- The StarlarkSemantics object is no longer treated as a recorded input (only recorded for Starlark repo rules, ignored for native repo rules), but as a predeclared input instead (i.e. hashed on the first line).
  - This slightly simplifies logic, and since the existing native repo rules are either local (local_repository, new_local_repository, local_config_platform) or being Starlarkified (the two Android repo rules), it will have minimal visible impact.
- Each type of recorded inputs is a subclass of `RepoRecordedInput`, which knows how to stringify itself, verify its own up-to-date-ness, and how to parse itself from a string.
- We also try to collect as many SkyKeys needed to verify up-to-date-ness as possible in one go and do a mass Skyframe evaluation. This avoids a fair amount of Skyframe restarts (unlikely to have super big impact on performance, but is a nice thing to do).

Work towards #20952 and #12227.
    @Wyverald
    Wyverald committed Feb 2, 2024
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    @Wyverald
    Wyverald authored Feb 2, 2024
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