File locking on sshfs file system, possible?

[Chris Green]

On Fri, Oct 25, 2019 at 08:58:06AM +0100, Chris Green wrote:
> I just tried running mutt 'remotely' by mounting ~/.muttrc and my main
> mail directory ~/Mail using sshfs and running a local copy of mutt.
> This makes handling attachments and HTML E-Mail much faster and easier
> than running mutt on the remote system via ssh.
> 
> However when I try and save E-Mails into the ~/Mail hierarchy it
> complains that it can't lock the mbox file.  I guess that there's some
> sort of incompatibility between mutt's default locking method and
> sshfs. 
> 
> Is there anything I can do about this?  I.e. can I build mutt with a
> different locking method (or more the point the dotlock program I
> suppose) or am I basically stuck?  I know I could move to maildir but
> I'd prefer not to really and that would likely slow things down across
> an sshfs connection.
> 
A little more information:-

    I'm running mutt 1.10.1 on xubuntu 19.04 

    The actual error I'm seeing is "Couldn't lock /home/chris/Mail/folder/test"
    (Obviously changes according to name of destination mbox)

So is it not a locking problem, rather a permission problem?  My UID
on both systems is the same so files in the ~/Mail directory are all
owned by me on both systems.

-- 
Chris Green