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Support the MacOS sandbox for larger projects #489

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Support the MacOS sandbox for larger projects #489

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Commits on Dec 29, 2023

  1. Support the MacOS sandbox for larger projects 

    Fixes ipetkov#482.

MacOS has trouble with derivations which (directly or transitively)
have many buildInputs.

Crane at present creates a build structure in which a given cargo
command will transitively depend on numCrates nix store paths. This
means that Crane fails to build projects with over about 600 crate
dependencies on MacOS if the sandbox is enabled.

This MR utilises a tiering approach to improve this.

Each registry is assigned to a shard based on the hash of the crate
name. If there are <32 crates in a registry there is one shard, if
<2048 there are 16 shards, otherwise 256. Crates are directly extracted
into these shard derivations rather than symlinking.

What this means is:

1. Crane will not create a vendoring derivation with many inputs
   unless a project has a truly crazy number of dependencies.
1. No downstream cargo derivation will have many inputs either.
    @j-baker
    j-baker committed Dec 29, 2023
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  2. fmt

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    j-baker committed Dec 29, 2023
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  3. changelog

    @j-baker
    j-baker committed Dec 29, 2023
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