cryptic error if gdb is not installed #13
Description
$ hijack 20554
=> Hijacking.../var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:8: Use RbConfig instead of obsolete and deprecated Config.
/var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:113:in `write': Broken pipe (Errno::EPIPE)
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:113:in `puts'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:113:in `exec'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:100:in `backtrace'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:92:in `ensure_attached_to_ruby_process'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:34:in `attach_outside_gc'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/gdb.rb:9:in `initialize'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/payload.rb:9:in `new'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/payload.rb:9:in `inject'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack/console.rb:10:in `initialize'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack.rb:18:in `new'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/lib/hijack.rb:18:in `start'
from /var/lib/gems/1.9.1/gems/hijack-0.2.1/bin/hijack:27:in `<top (required)>'
from /usr/local/bin/hijack:19:in `load'
from /usr/local/bin/hijack:19:in `<main>'
The issue was that gdb is not installed. After installing it, hijacking appears to be working as intended (I get a "20554 doesn't appear to be a Ruby process!" error, but that's obviously a different issue).
I suggest to preflight a check for gdb and if not found, print "GDB could not be found. Please ensure it is installed." or similar message.