f128089535
This makes the "Buffering to disk" part of `docker push` 70% faster in my use-case (having already applied #12833). fsync'ing here serves no valuable purpose: if the drive's operation is interrupted, so it the program's, and this archive has no value other than the immediate and transient one. Signed-off-by: Burke Libbey <burke.libbey@shopify.com> Upstream-commit: 236dbc2e59f5b665f9fa30f3f7ba1fe6c8483b24 Component: engine