[Bug 254452] [fusefs] [devel/gvfs]: gvfsd-fuse needs FUSE_CAP_ATOMIC_O_TRUNC from fuse

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254452

--- Comment #3 from Damjan Jovanovic <damjan.jov at gmail.com> ---
(In reply to Alan Somers from comment #1)

gvfsd-fuse exports gio operations on its virtual filesystems over FUSE, and in
gio O_APPEND becomes g_file_append_to(), O_TRUNC becomes g_file_replace(), and
there is no API - by design - for opening a file to write without either of
those flags; it fails with ENOTSUP.

Even with gvfs patched to remove FUSE_CAP_ATOMIC_O_TRUNC, the result is that
files cannot be overwritten.

This would be difficult to fix inside gvfsd-fuse, and might not be accepted
upstream. Can't our VFS layer be patched to delegate open()/create() flags to
filesystems that support them?

gvfs is an important and widely used desktop package.

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