Date: Thu, 1 Oct 1998 03:25:53 -0700
From: John Wagner <wagner@itd.ucdavis.edu>
To: sr-project@cs.arizona.edu
Subject: ssh vs. rsh

Hi!
I needed to build sr to use ssh rather than rsh.  It was fairly simple,
but required a couple changes.

First, in Configuration, put
	RSHCMD = /usr/bin/ssh
Then, in rts/srx.c, when calling execl (for remote machine startup of a vm)
you need to switch the order of the hostname (p->hostname) and the "-n" flag.

Also, the conditional compilation for linux of an extra "--"
arg needs to be removed when calling ssh.  That is, the call needs to
evaluate out to:
    execl("/usr/bin/ssh", "/usr/bin/ssh", "-n", "hostname.cs.arizona.edu", ...);
Also, the "--" doesn't appear to be needed in my version of linux; as I
recall, this was fixed long ago.

Sorry I didn't piece this together as a patch file; I don't have the time
right now, and it probably requires the addition of an extra define in
Configuration, like
	#define USE_SSH 1
(and I really don't have the time).

Anyway, this is what I had to do to get sr to build on my Alpha running linux
and using ssh instead of rsh.

Sincerely,
John Wagner
Chief Scientific Programmer
Institute of Theoretical Dynamics
University of California, Davis



Date: Thu, 1 Oct 1998 22:23:16 -0700
From: John Wagner <wagner@itd.ucdavis.edu>

Please feel free to post it to the web site, and keep my name
and email address on it, maybe add that I'd be more than happy
to give others a hand if they run into problems with it.

NB, though--our resident linux guru told me today that one can
build ssh so that it takes rsh args.  I havent' verified it,
but our other guru thought it was the case as well.  So,
that is probably a better sol'n.

Regards,
John Wagner
Chief Scientific Programmer
Institute of Theoretical Dynamics
University of California, Davis