[swift-build-dev] [Proposal] Lock file for Swift Package Manager

[Max Howell]

Another option that has occurred to me after talking with Tim Kientzle is to use git submodules

submodules lock other clones to a specific revision. Our Packages/ directory is already a directory of clones.

I have not given it a lot of thought yet, but there is possibly power in reusing this existing part of git.

Mailed here for input.
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