From 6e126ed79db0e484dfe9db5724fc21df1e7627b2 Mon Sep 17 00:00:00 2001
From: Tommi Virtanen <tv@eagain.net>
Date: Tue, 1 Sep 2015 15:34:12 -0700
Subject: [PATCH] fuse/ipns: Only change file size in Setattr if asked to

This used to cause files e.g. being edited with `vi` to become 0-size.

License: MIT
Signed-off-by: Tommi Virtanen <tv@eagain.net>
---
 fuse/ipns/ipns_unix.go | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fuse/ipns/ipns_unix.go b/fuse/ipns/ipns_unix.go
index 91c3db55d..c6759531d 100644
--- a/fuse/ipns/ipns_unix.go
+++ b/fuse/ipns/ipns_unix.go
@@ -335,15 +335,17 @@ func (fi *File) Flush(ctx context.Context, req *fuse.FlushRequest) error {
 }
 
 func (fi *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *fuse.SetattrResponse) error {
-	cursize, err := fi.fi.Size()
-	if err != nil {
-		return err
-	}
-	if cursize != int64(req.Size) {
-		err := fi.fi.Truncate(int64(req.Size))
+	if req.Valid.Size() {
+		cursize, err := fi.fi.Size()
 		if err != nil {
 			return err
 		}
+		if cursize != int64(req.Size) {
+			err := fi.fi.Truncate(int64(req.Size))
+			if err != nil {
+				return err
+			}
+		}
 	}
 	return nil
 }