Move shared cache pre-allocation and support macOS #70331
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This commit moves the shared cache pre-allocation code out of bootstrap, and instead to the searchable snapshots code. We go out of our way to only grant permissions to a specific library used for the pre-allocation. Additionally, to ensure our interfaces are sound, we add a macOS implementation based on fcntl and ftruncate. Co-authored-by: Yannick Welsch <yannick@welsch.lu>
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This commit moves the shared cache pre-allocation code out of bootstrap, and instead to the searchable snapshots code. We go out of our way to only grant permissions to a specific library used for the pre-allocation.
Additionally, to ensure our interfaces are sound, we add a macOS implementation based on fcntl and ftruncate.
Relates #70285 (backport)