func (fs *memFS) CreateSymlink(
op *fuseops.CreateSymlinkOp) (err error) {
fs.mu.Lock()
defer fs.mu.Unlock()
// Grab the parent, which we will update shortly.
parent := fs.getInodeOrDie(op.Parent)
// Ensure that the name doesn't already exist, so we don't wind up with a
// duplicate.
_, _, exists := parent.LookUpChild(op.Name)
if exists {
err = fuse.EEXIST
return
}
// Set up attributes from the child, using the credentials of the calling
// process as owner (matching inode_init_owner, cf. http://goo.gl/5qavg8).
now := fs.clock.Now()
childAttrs := fuseops.InodeAttributes{
Nlink: 1,
Mode: 0444 | os.ModeSymlink,
Atime: now,
Mtime: now,
Ctime: now,
Crtime: now,
Uid: op.Header().Uid,
Gid: op.Header().Gid,
}
// Allocate a child.
childID, child := fs.allocateInode(childAttrs)
// Set up its target.
child.target = op.Target
// Add an entry in the parent.
parent.AddChild(childID, op.Name, fuseutil.DT_Link)
// Fill in the response entry.
op.Entry.Child = childID
op.Entry.Attributes = child.attrs
// We don't spontaneously mutate, so the kernel can cache as long as it wants
// (since it also handles invalidation).
op.Entry.AttributesExpiration = fs.clock.Now().Add(365 * 24 * time.Hour)
op.Entry.EntryExpiration = op.Entry.EntryExpiration
return
}
