The fillGo18FileTypeBits func was added in 1a451d9a7b
to keep the tar headers consistent with headers created with go1.8 and older.
go1.8 and older incorrectly preserved all file-mode bits, including file-type,
instead of stripping those bits and only preserving the _permission_ bits, as
defined in;
- the GNU tar spec: https://www.gnu.org/software/tar/manual/html_node/Standard.html
- and POSIX: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/tar.h.html
We decided at the time to copy the "wrong" behavior to prevent a cache-bust and
to keep the archives identical, however:
- It's not matching the standards, which causes differences between our tar
implementation and the standard tar implementations, as well as implementations
in other languages, such as Python (see docker/compose#883).
- BuildKit does not implement this hack.
- We don't _need_ this extra information (as it's already preserved in the
type header; https://pkg.go.dev/archive/tar#pkg-constants
In short; let's remove this hack.
This reverts commit 1a451d9a7b.
This reverts commit 41eb61d5c2.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
cddaa84777