FreeBSD FUSE calls truncate() on read-only files

[Eggert, Lars]

Hi,

this came up when trying to port tup (https://github.com/gittup/tup) to FreeBSD.

Even though we are opening the file read-only with cat, FUSE calls truncate() on it, which modifies its mtime and this screws up tup. See https://github.com/gittup/tup/issues/198

Anyone know why FreeBSD's FUSE is doing this?

Thanks,
Lars
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