Re: support git+mosh for unreliable connections

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On Wed, Apr 15, 2015 at 07:46:15PM +0200, Johannes Schindelin wrote:
> Hi Trevor,
> 
> On 2015-04-15 17:33, Trevor Saunders wrote:
> > On Wed, Apr 15, 2015 at 04:41:42PM +0200, Johannes Schindelin wrote:
> >>
> >> On 2015-04-15 16:18, Pirate Praveen wrote:
> >> > On Wednesday 15 April 2015 07:22 PM, Michael J Gruber wrote:
> >> >> What would that require git to do, beyond taking whatever you tell it
> >> >> (using GIT_SSH or _GIT_SSH_COMMAND) to use as a drop in replacement for ssh?
> >> >
> >> > May be support git+mosh as a protocol, since it is not a drop in
> >> > replacement. It is redesigned remote shell. The ideas it uses for
> >> > session resumption needs to be reimplemented. This will need support
> >> > from git, because it needs server side to be modified. Use SSP to return
> >> > the the current progress for a particular session (it uses AES session ids).
> >>
> >> It will need support from Git alright, but not as much as from mosh, see my other reply: Mosh was not designed for non-interactive use. That support would have to be added before we can go any further.
> > 
> > is that really relevent? mosh doesn't support things like X forwarding
> > or port forwarding, but it certainly does support ssh <host> <command>
> > and then doing IO.
> 
> Ah, so mosh's README lied to me!

I wouldn't say it lied, its just not really clear what is "interactive"
I'd say git's use of ssh is kind of interactive compared to things like
port forwarding.

> If `mosh <user>@<host> <command>` works, then a simple `GIT_SSH=mosh` should work out of the box, too. Have you tried it?

it does work, I just tried mosh $host cat and then typing stuff and
having it printed back at me.  However it clears the terminal before
hand and prints a message on exit.  I tried GIT_SSH=mosh git clone and
it failed, but I haven't really dug into why.  SO I suspect this can be
made to work with some work on the mosh side, but I'm not sure exactly
how ssh and mosh are behaving differently here.

Trev

> 
> Ciao,
> Johannes
>   It might not support not doing terminal emulation
> > stuff, but that seems like a simple thing to change in principal at which
> > point I think it would support enough of ssh's functionality its a drop
> > in replacement as far as git is concerned.  Seems to me mosh is close
> > enough on its own its worth experimentation by someone who cares.
> > 
> > Trev
> > 
> >> > So when a client connect with a session id, git server side can respond
> >> > with the current state, how many objects received in that session, and
> >> > client can continue from where it stopped. Client also will need to
> >> > store session information.
> >>
> >> No, the protocol can stay exactly the same, once you have a way to communicate non-interactively via mosh.
> >>
> >> Ciao,
> >> Johannes
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