Previously, only perm-related bits where preserved when rewriting
FileMode in tar entries on Windows. This had the nasty side effect of
having tarsum returning different values when executing from a tar filed
produced on Windows or Linux.
This fix the issue, and pave the way for incremental build context
to work in hybrid contexts.
Signed-off-by: Simon Ferquel <simon.ferquel@docker.com>
Upstream-commit: 41eb61d5c2a44c745b11ada948034fd3bcc42db5
Component: engine