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<h1 class="title toc-ignore">Shared R libraries</h1>
<h4 class="author">Paul Melloy</h4>
<h4 class="date">2025-02-03</h4>
</div>
<p>Frequently when setting up a new virtual machine online to run a
shiny server I run into issues that the shiny server can’t run because
it can’t access the users library. The shiny server runs on the ‘shiny’
user and can’t access my ‘paul’ user R library.</p>
<p>There are many way to solve this, however one way is to have a shared
library between me ‘paul’ and the ‘shiny’ user.</p>
<p>Log into the terminal in the background and create a new folder.</p>
<pre class="bash"><code>sudo mkdir /home/shared</code></pre>
<p>Change the permissions on the shared folder to the user’s group.</p>
<pre class="bash"><code>#change group ownership to users
sudo chgrp users /home/shared
# change permissions to drwxrwxr--
# the owner 'root' and group 'users' to read write execute and others read only
sudo chmod 774 /home/shared
# set group ids for and new subdirectories
sudo chmod +s /home/shared
# add an R library folder
mkdir /home/shared/r_libs/4.4</code></pre>
<p>Check that ‘shiny’ and ‘paul’ are in the ‘users’ group, and add them
if not</p>
<pre class="bash"><code>grep 'users' /etc/group
# add them if missing
sudo usermod -a -G users paul
sudo usermod -a -G users shiny</code></pre>
<p>copy all ’paul’s libraries to <code>shared/r_libs</code></p>
<pre class="bash"><code>cp -a /home/paul/R/x86_64-pc-linux-gnu-library/. /home/shared/r_libs/</code></pre>
<p>While we could edit the system path variables in
<code>/usr/lib/R/etc/Renviron.site</code>. I am not yet comforatble
messing with the system variables, and this might interrupt additional
users of the machine down the line.<br />
Instead I will add the library to the user <code>.Renviron</code></p>
<pre class="bash"><code>echo "/home/shared/r_libs/" >> /home/paul/.Renviron</code></pre>
<p>Then add the following to the top of a shiny <code>app.R</code>
file.</p>
<pre class="r"><code>.libPaths("/home/shared/r_libs/4.4/")
# Or
if(system("whoami") == "shiny"){
.libPaths("/home/shared/r_libs/4.4/")
}</code></pre>
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