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627a292a11
fsync blocks until the contents have been actually written to disk, which would be useful if we didn't want to report success until having achieved durability. But the OS will ensure coherency; i.e. if one process writes stuff without calling fsync, then another process reads that stuff, the writes will be seen even if they didn't get flushed to disk yet. Since this code deals with ephemeral cache data, it's not worth trying to achieve this kind of durability guarantee. This is consistent with all the other tooling on the system. Certainly, if we wanted to change our stance on this, it would not be something that affects only the git fetching logic.