[petsc-dev] How to compose a git URL for going through 2 machines

[Satish Balay]

I'm not sure why I use the full path to nc in the config.

You can check if 'nc' is in your path (on red-wtrw) - or if its at /usr/bin/nc

ssh wdn at red-wtrw.lanl.gov which nc

Alternative is ssh-portforwarding as suggested by Aron.

1. setup ssh-portforwardig in a terminal that you won't use
<keep this running as long as you need it>

ssh -N wdn at red-wtrw.lanl.gov -L10022:lu-fe1.lanl.gov:22

2. From your normal terminal use GIT with a URL using the forwarded port.

git clone ssh://localhost:10022/usr/projects/artab/users/wdn/repos/git/petsc

Satish

On Thu, 6 Nov 2014, Nystrom, William David wrote:

> Satish,
> 
> I tried your suggestion but it failed.  The problem was that nc was not a recognized command
> on red-wtrw - presumably because it runs a restricted shell.
> 
> I have an email in to the LANL consultants asking how I should do this - since LANL maintains
> red-wtrw.
> 
> I've also tried some other suggestions various people have suggested but have not found
> something that works yet.
> 
> Thanks,
> 
> Dave
> 
> --
> Dave Nystrom
> LANL HPC-5
> Phone: 505-667-7913
> Email: wdn at lanl.gov
> Smail: Mail Stop B272
>        Group HPC-5
>        Los Alamos National Laboratory
>        Los Alamos, NM 87545
> 
> 
> ________________________________________
> From: Satish Balay [balay at mcs.anl.gov]
> Sent: Wednesday, November 05, 2014 12:50 PM
> To: Nystrom, William David
> Cc: petsc-dev at mcs.anl.gov
> Subject: Re: [petsc-dev] How to compose a git URL for going through 2 machines
> 
> just concentrate on setting up ssh tunnel. git shouldn't have to deal
> with it. Look for 'ssh ProxyCommand' [google]
> 
> Perhaps the following will work for you.
> 
> Add the following to ~/.ssh/config
> 
> Host lu-fe1.lanl.gov
>   ProxyCommand ssh -q -a -x wdn at red-wtrw.lanl.gov /bin/nc %h %p
> 
> Now you check if ssh works:
> 
> ssh lu-fe1.lanl.gov ls /usr/projects/artab/users/wdn/repos/git/petsc
> 
> And then use:
> 
> git clone lu-fe1.lanl.gov:/usr/projects/artab/users/wdn/repos/git/petsc
> 
> Satish
> 
> On Wed, 5 Nov 2014, Nystrom, William David wrote:
> 
> > I was wondering if anyone might know the solution to a problem I am having with
> > composing a git URL for cloning a git repo that is two machines away.
> >
> > I'm trying to execute the following git command:
> >
> > git clone ssh://wdn@red-wtrw.lanl.gov/lu-fe1.lanl.gov/usr/projects/artab/users/wdn/repos/git/petsc
> >
> > I've also tried the following:
> >
> > git clone ssh://wdn@red-wtrw.lanl.gov:lu-fe1.lanl.gov/usr/projects/artab/users/wdn/repos/git/petsc
> >
> > And also
> >
> > git clone ssh://wdn@red-wtrw.lanl.gov:lu-fe1.lanl.gov:/usr/projects/artab/users/wdn/repos/git/petsc
> >
> > Basically, I have to go through a gateway machine running a restricted shell
> > to get to a machine which mounts the filesystem where my git repo is located.
> > Each of the above commands fail.
> >
> > However, I can run the following scp command successfully:
> >
> > scp -p file_name wdn at red-wtrw.lanl.gov:lu-fe1.lanl.gov:/usr/projects/artab/users/wdn
> >
> > So I'm wondering if there is a way to chain together two machines in a git URL like I can
> > with scp or whether there is some fundamental reason why this just will not work.  Does
> > anyone know if what I am doing is possible and if so, how?  Or do I have to set up and
> > use an ssh tunnel?
> >
> > Thanks,
> >
> > Dave
> >
> > --
> > Dave Nystrom
> > LANL HPC-5
> > Phone: 505-667-7913
> > Email: wdn at lanl.gov
> > Smail: Mail Stop B272
> >        Group HPC-5
> >        Los Alamos National Laboratory
> >        Los Alamos, NM 87545
> >
> >
> 
>