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
--~--~---------~--~----~------------~-------~--~----~
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at http://groups.google.com/group/capistrano
-~----------~----~----~----~------~----~------~--~---
