From: Randy Coulman <rcoulman@...>
Date: 2012-02-23T01:01:38+09:00
Subject: Detecting an error in Net::SSH#exec!

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When I execute a remote command with Net::SSH#exec!, how do I tell whether
or not the command succeeded?

So far, this is the way I've found to do it:

Net::SSH.start("host", "username") do | ssh |
  ssh.exec!("some_command") do | channel, stream, data |
    if stream == :stderr
       # an error occurred
    else
       # do something with data
    end
end

This only works if the command I'm running writes to stderr if and only if
it encounters an error, which seems flaky.

How do others deal with this?

Thanks,
Randy
-- 
Randy Coulman
rcoulman@gmail.com
Twitter: @randycoulman

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When I execute a remote command with Net::SSH#exec!, how do I tell whether =
or not the command succeeded?<div><br></div><div>So far, this is the way I&=
#39;ve found to do it:</div><div><br></div><div>Net::SSH.start(&quot;host&q=
uot;, &quot;username&quot;) do | ssh |</div>
<div>=A0 ssh.exec!(&quot;some_command&quot;) do | channel, stream, data |</=
div><div><div>=A0 =A0 if stream =3D=3D :stderr</div><div>=A0 =A0 =A0 =A0# a=
n error occurred</div><div>=A0 =A0 else</div><div>=A0 =A0 =A0 =A0# do somet=
hing with data</div><div>=A0 =A0 end</div>
<div>end</div><div><br></div><div>This only works if the command I&#39;m ru=
nning writes to stderr if and only if it encounters an error, which seems f=
laky.</div><div><br></div><div>How do others deal with this?</div><div>
<br></div><div>Thanks,</div><div>Randy</div>-- <br>Randy Coulman<br><a href=
=3D"mailto:rcoulman@gmail.com" target=3D"_blank">rcoulman@gmail.com</a><div=
>Twitter: @randycoulman</div><br>
</div>

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