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POSet effective group id of Perl script
 

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    <p>I have file permissions issues that I would like to resolve without resorting to making everything world writable.</p> <p>I'm writing files to a NetApp SAN. The directory I'm writing to is owned by the <code>devel</code> user, and has a group of <code>devel</code> with group-writable permissions (<code>0775</code>). The username I'm writing as is in the <code>username</code> and <code>devel</code> groups. </p> <p>The problem appears to be the SAN only checks the first group, so I get permission denied. If I use the <code>newgrp</code> or <code>sg</code> commands to change my group to <code>devel</code>, then I am able to write to the directory.</p> <p>The script attempting to do the writing is written in Perl, but it is started remotely from another machine via ssh and some bash scripting.</p> <p>I cannot change the target directory to be in the <code>username</code> group, because there are other developers and they're in different groups (but we all share the <code>devel</code> group).</p> <p>I cannot make Perl script itself setgid, because we run different environments (devel, test, qa, production, etc) with appropriate groups, and I don't want to manage file permission bits at that level.</p> <p>I cannot use the POSIX <code>setgid</code> function from within the Perl script because it doesn't start as root (and I have no way to ever get root), so I get permission denied. Assigning to <code>$)</code> and <code>$(</code> gives the same result.</p> <p>I cannot use the <a href="http://www.linuxmanpages.com/man1/newgrp.1.php" rel="nofollow noreferrer"><code>newgrp</code></a> command from bash because <code>newgrp</code> doesn't take any arguments, it just starts a new interactive shell (with any following commands executed after the new shell has exited).</p> <p>I also cannot use <a href="http://www.linuxmanpages.com/man1/newgrp.1.php" rel="nofollow noreferrer"><code>newgrp</code></a> to start a new shell and spawn the Perl script from there, since the Perl script is executed on a remote machine over an ssh connection. The script will get a 'fresh' shell on the remote machine under my default group, not the group set via <code>newgrp</code> on the local machine.</p> <p>I cannot use the <code>sg</code> command because it only takes a single argument. I quote the full command line, including known arguments. However, the way we start remote processes over ssh includes passing local arguments along in the <code>"$@"</code> bash variable. In other words, I can do a <code>process start</code> or <code>process stop</code>, and the <code>process</code> script handles the <code>ssh</code> command and passes along any local arguments I've typed in using <code>"$@"</code>. I've tried writing a wrapper, but have discovered we use a variety of interesting local argument forms, and am hesitant to dive into the necessary quoting and escaping nightmare.</p> <p>So, my question is: is anyone aware of some other means of setting the effective group id for a running process, from Perl or bash? Is there a multi-argument form of <code>sg</code>?</p>
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