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fuse: optional supplementary group in create requests

Miklos Szeredi requested to merge mszeredi/centos-stream-9:bz2134128 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2134128

Permission to create an object (create, mkdir, symlink, mknod) needs to take supplementary groups into account.

Add a supplementary group request extension. This can contain an arbitrary number of group IDs and can be added to any request. This extension is not added to any request by default.

Add FUSE_CREATE_SUPP_GROUP init flag to enable supplementary group info in creation requests. This adds just a single supplementary group that matches the parent group in the case described above. In other cases the extension is not added.

Signed-off-by: Miklos Szeredi mszeredi@redhat.com

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