Identify current host - Capistrano

Message from discussion Identify current host
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Date: Fri, 3 Jul 2009 17:47:35 -0700
Message-ID: <be2921990907031747g35a66441w15eecfc687165b3b@mail.gmail.com>
Subject: Identify current host
From: Gary Richardson <gary.richard...@gmail.com>
To: capistrano@googlegroups.com
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Hey,
Two part question that I haven't been able to answer:

1) can I get the current host a task is executing on? I've read some stuff
about $CAPISTRANO:HOST$, but it doesn't seem to work for me
2) if I have an array of values (let's say an array that maps ec2 host names
to ec2 instance id's), can I use this same method to look up something from
that array?

For example:

task :example do
  instanceId = lookUpTable[hostname]
  run "somecommand -h #{hostname} -i #{instanceid}"
done

PS, the error I get when I run a task with $CAPISTRANO:HOST$ is:

  * executing "echo $CAPISTRANO:HOST$"
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/server_definition.rb:16:in
`initialize': undefined method `match' for 101:Fixnum (NoMethodError)
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:80:in
`new'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:80:in
`wrap_server'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:98:in
`wrap_list'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:97:in
`map'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:97:in
`wrap_list'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:59:in
`to_ary'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:74:in
`concat'
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:74:in
`dynamic_servers'
         ... 28 levels...
        from
/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/cli/execute.rb:14:in
`execute'
        from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/bin/cap:4
        from /usr/bin/cap:16:in `load'
        from /usr/bin/cap:16


Thanks!

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Hey,<div><br></div><div>Two part question that I haven&#39;t been able to a=
nswer:</div><div><br></div><div>1) can I get the current host a task is exe=
cuting on? I&#39;ve read some stuff about $CAPISTRANO:HOST$, but it doesn&#=
39;t seem to work for me</div>
<div>2) if I have an array of values (let&#39;s say an array that maps ec2 =
host names to ec2 instance id&#39;s), can I use this same method to look up=
 something from that array?</div><div><br></div><div>For example:</div>
<div><br></div><div>task :example do</div><div>=A0=A0instanceId =3D lookUpT=
able[hostname]</div><div>=A0=A0run &quot;somecommand -h #{hostname} -i #{in=
stanceid}&quot;</div><div>done</div><div><br></div><div>PS, the error I get=
 when I run a task with $CAPISTRANO:HOST$ is:</div>
<div><br></div><div><div>=A0=A0* executing &quot;echo $CAPISTRANO:HOST$&quo=
t;</div><div>/usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/se=
rver_definition.rb:16:in `initialize&#39;: undefined method `match&#39; for=
 101:Fixnum (NoMethodError)</div>
<div>=A0=A0 =A0 =A0 =A0from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/li=
b/capistrano/role.rb:80:in `new&#39;</div><div>=A0=A0 =A0 =A0 =A0from /usr/=
lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:80:in `wrap_=
server&#39;</div>
<div>=A0=A0 =A0 =A0 =A0from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/li=
b/capistrano/role.rb:98:in `wrap_list&#39;</div><div>=A0=A0 =A0 =A0 =A0from=
 /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:97:in =
`map&#39;</div><div>
=A0=A0 =A0 =A0 =A0from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/cap=
istrano/role.rb:97:in `wrap_list&#39;</div><div>=A0=A0 =A0 =A0 =A0from /usr=
/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:59:in `to_a=
ry&#39;</div><div>
=A0=A0 =A0 =A0 =A0from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/cap=
istrano/role.rb:74:in `concat&#39;</div><div>=A0=A0 =A0 =A0 =A0from /usr/li=
b/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:74:in `dynamic=
_servers&#39;</div>
<div>=A0=A0 =A0 =A0 =A0 ... 28 levels...</div><div>=A0=A0 =A0 =A0 =A0from /=
usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/cli/execute.rb:1=
4:in `execute&#39;</div><div>=A0=A0 =A0 =A0 =A0from /usr/lib/ruby/gems/1.8/=
gems/capistrano-2.5.5/bin/cap:4</div>
<div>=A0=A0 =A0 =A0 =A0from /usr/bin/cap:16:in `load&#39;</div><div>=A0=A0 =
=A0 =A0 =A0from /usr/bin/cap:16</div><div><br></div></div><div><br></div><d=
iv>Thanks!</div>

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