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Re: ssh changed from socket to pipe stdin


From: Chet Ramey
Subject: Re: ssh changed from socket to pipe stdin
Date: Thu, 23 Oct 2008 08:00:21 -0400

> and with this change .bashrc is never sourced. Will we do something with 
> this? Changing check from socket to pipe stdin will cause problems with 
> older ssh. Maybe defining SSH_SOURCE_BASHRC? Or just don't do anything?

This is the reaason that SSH_SOURCE_BASHRC exists, but you have to
accept the consequences of enabling it.

Changing the shell to check whether stdin is a pipe and sourcing the
.bashrc in that case will cause havoc -- every invocation of bash -c
by a program that uses a pipe for input and output to that shell will
cause the .bashrc to be sourced.  This seems like something that would
cause more trauma than would be worth it.

The problem with SSH_SOURCE_BASHRC is that it looks for environment
variables set by sshd that persist across shell invocations.  This
means that other programs running bash to execute non-interactive
commands with `bash -c' will result in sourcing .bashrc, with
unpredictable consequences.  This isn't that great, either.

So far, neither solution has been clean enough for me to consider
changing the current behavior.  Ultimately, you'll have to decide what
is best for your customers, but you should at least know what you'll
potentially be in for. 

Chet
 

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer

Chet Ramey, ITS, CWRU    address@hidden    http://tiswww.tis.case.edu/~chet/




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