From: salamond <jarodzz@...>
Date: 2012-06-27T17:12:44+09:00
Subject: how about adding method hook

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Hi, guys.

I want An agent on machine, so that it can fake user actions.

class Agent
  def initialize(user, dir)
    @user = user
    @dir = dir
  end
  def mkdir(dir)
    bak = Process.euid
    `mkdir`
    Process.euid = bak
  end
  def create_file(file, content)
    bak = Process.euid
    `echo #{content} > #{file}`
    Process.euid = bak
  end
end

My problem is, I have a very long list of actions, like mv, touch, mkdir,
rm, etc.
I don't want to add save and restore euid for all methods.

I kind of guess here I should use some meta programming skills. here's what
i tried.

class Agent
  def self.as_me_do(method_name, &block)
     define_method method_name do
        block
     end
   end

  as_me_do mkdir do
    `mkdir #{dir}`
  end
end

but this still generate code duplications, and it doesn't work.
I'm not sure how this could be done gracefully.

Any one been here before?

thanks

Yan Jiang

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Hi, guys.<div><br></div><div>I want An agent on machine, so that it can fak=
e user actions.</div><div><br></div><div>class Agent</div><div>=A0 def init=
ialize(user, dir)</div><div>=A0 =A0 @user =3D user</div><div>=A0 =A0 @dir =
=3D dir</div>
<div>=A0 end</div><div>=A0 def mkdir(dir)</div><div>=A0 =A0 bak =3D Process=
.euid</div><div>=A0 =A0 `mkdir`</div><div>=A0 =A0 Process.euid =3D bak</div=
><div>=A0 end</div><div>=A0 def create_file(file, content)</div><div>=A0 =
=A0 bak =3D Process.euid</div>
<div>=A0 =A0 `echo #{content} &gt; #{file}`</div><div>=A0 =A0 Process.euid =
=3D bak</div><div>=A0 end</div><div>end</div><div><br></div><div>My problem=
 is, I have a very long list of actions, like mv, touch, mkdir, rm, etc.</d=
iv><div>
I don&#39;t want to add save and restore euid for all methods.</div><div><b=
r></div><div>I kind of guess here I should use some meta programming skills=
. here&#39;s what i tried.</div><div><br></div><div>class Agent</div><div>
=A0 def self.as_me_do(method_name, &amp;block)</div><div>=A0 =A0 =A0define_=
method method_name do</div><div>=A0 =A0 =A0 =A0 block</div><div>=A0 =A0 =A0=
end</div><div>=A0 =A0end</div><div>=A0=A0</div><div>=A0 as_me_do mkdir do</=
div><div>=A0 =A0 `mkdir #{dir}`</div>
<div>=A0 end</div><div>end</div><div><br></div><div>but this still generate=
 code duplications, and it doesn&#39;t work.</div><div>I&#39;m not sure how=
 this could be done gracefully.</div><div><br></div><div>Any one been here =
before?</div>
<div><br></div><div>thanks</div><div><br></div><div>Yan Jiang</div>

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