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Using sudo to write to a file as root from a script

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  Using sudo to write to a file as root from a script Adam Mercer <ramercer@gmail.com> - 2013-08-08 23:11 -0500
    Re: Using sudo to write to a file as root from a script Denis McMahon <denismfmcmahon@gmail.com> - 2013-08-09 04:36 +0000
    Re: Using sudo to write to a file as root from a script Nobody <nobody@nowhere.com> - 2013-08-09 21:12 +0100
      Re: Using sudo to write to a file as root from a script Nobody <nobody@nowhere.com> - 2013-08-09 21:16 +0100

#52240 — Using sudo to write to a file as root from a script

Hi

I'm trying to write a script that writes some content to a file root
through sudo, but it's not working at all. I am using:

  channel = 'stable'
  config_file = '/opt/ldg/etc/channel.conf'
  command = ['echo', '-n', channel, '|', 'sudo', 'tee', config_file]
  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  out, _ = p.communicate()

But it seems as if this isn't doing anything.

I just want to write the contents of the variable channel to the file
/opt/ldg/etc/channel.conf. But whatever I try just doesn't work. Can
anyone offer any pointers?

Cheers

Adam

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#52242

On Thu, 08 Aug 2013 23:11:09 -0500, Adam Mercer wrote:

> Hi
> 
> I'm trying to write a script that writes some content to a file root
> through sudo, but it's not working at all. I am using:
> 
>   channel = 'stable'
>   config_file = '/opt/ldg/etc/channel.conf'
>   command = ['echo', '-n', channel, '|', 'sudo', 'tee', config_file]
>   p = subprocess.Popen(command, stdout=subprocess.PIPE,
>   stderr=subprocess.PIPE)
>   out, _ = p.communicate()
> 
> But it seems as if this isn't doing anything.
> 
> I just want to write the contents of the variable channel to the file
> /opt/ldg/etc/channel.conf. But whatever I try just doesn't work. Can
> anyone offer any pointers?

Do you find anything with:

$ grep sudo /var/log/auth.log

(you may need to specify a different log)

Is the process that's trying to use the sudo command allowed to do so 
without a password?

man sudoers

Note - after editing /etc/sudoers you must set the permissions back to 440

-- 
Denis McMahon, denismfmcmahon@gmail.com

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#52270

On Thu, 08 Aug 2013 23:11:09 -0500, Adam Mercer wrote:

> I'm trying to write a script that writes some content to a file root
> through sudo, but it's not working at all. I am using:

>   command = ['echo', '-n', channel, '|', 'sudo', 'tee', config_file]

You can't create a pipeline like this. All of the list elements after the
first will be passed as arguments to "echo".

Try:

  command = ['sudo', 'tee', config_file]
  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  out, _ = p.communicate('channel')

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#52271

On Fri, 09 Aug 2013 21:12:20 +0100, Nobody wrote:

> Try:
> 
>   command = ['sudo', 'tee', config_file]
>   p = subprocess.Popen(command, stdout=subprocess.PIPE,
> stderr=subprocess.PIPE)
>   out, _ = p.communicate('channel')

Oops; you also need stdin=subprocess.PIPE.

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