Thanks for investigating that. It does indeed sound like a bug in
Net::SSH. I'll get that patched as soon as I can.
- Jamis
On May 31, 2008, at 7:29 PM, Rich Morin wrote:
>
> OK, figured it out. I was getting my trace from some code I
> put in ".../capistrano/configuration/connections.rb":
>
> class NilClass
> def split(*args)
> caller.each {|c| puts c }
> end
> end
>
>
> My code kept the program from crashing, because split() was now
> defined for NilClass. So, a Heisenbug.
>
>
> Here is a modified version:
>
> class NilClass
> def split(*args)
> puts "splitting Nil on '#{args[0]}', limit '#{args[1]}'"
> caller.each {|c| puts c }
> return []
> end
> end
>
>
> Its output looks like:
>
> $ cap -f ./t1.cap test_cmd
> * executing `test_cmd'
> * executing "pwd"
> servers: ["localhost"]
> splitting Nil on '(?-mix:,)', limit ''
> .../gems/net-ssh-2.0.1/lib/net/ssh/known_hosts.rb:101:in `keys_for'
> ...
> /usr/local/bin/cap:18
> splitting Nil on '(?-mix:,)', limit ''
> .../gems/net-ssh-2.0.1/lib/net/ssh/known_hosts.rb:101:in `keys_for'
> ...
> /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.3.0/bin/cap:4
> /usr/local/bin/cap:18
> [localhost] executing command
> stderr from localhost: tcsh: /dev/tty: Device not configured.
> stdout from localhost: /Users/rdm
> command finished
>
>
> So, it appears that net-ssh is trying to split something that it
> doesn't actually need. In the process, it crashes the program. A
> bit more work revealed that the string in question came from my
> '/Users/rdm/.ssh/known_hosts' file. So I cleared it out and the
> problem disappeared.
>
>
> I would say that this is a bug in net-ssh, because rather than
> checking for bad data and printing out a useful error message,
> it hands the problem to split(), which crashes mysteriously. It
> turns out that the keys_for() routine can't handle a blank line
> in the known_hosts file. So I filed this as:
>
> http://capistrano.lighthouseapp.com/projects/8716-capistrano/tickets/22-net-ssh-is-too-brittle
>
> -r
> --
> http://www.cfcl.com/rdm Rich Morin
> http://www.cfcl.com/rdm/resume [EMAIL PROTECTED]
> http://www.cfcl.com/rdm/weblog +1 650-873-7841
>
> Technical editing and writing, programming, and web development
>
> >
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