view .clang-format @ 50244:07d030b38097 stable

rust-dirstate-v2: don't write dirstate if data file has changed

This fixes the following race:
    - process A reads the dirstate
    - process B reads and writes the dirstate
    - process A writes the dirstate

This either resulted in losing what process B had just written or a crash
because the `uuid` had changed and we were trying to write to a file that
doesn't exist. More explanations inside.

This doesn't fix the issue for dirstate-v1, a later patch addresses it.

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