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<h1 class="logo"><a href="index.html">snap-pac</a></h1>
<p class="blurb">pacman hooks that use snapper to create pre/post btrfs snapshots</p>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Example</a></li>
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<h1>Example<a class="headerlink" href="#example" title="Permalink to this headline"></a></h1>
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<p>Here is an example of how the snapshots are created and how to rollback and pacman
transaction. Here the nano package is installed:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pacman -S nano
</pre></div>
</div>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>resolving dependencies...
looking for conflicting packages...
Packages (1) nano-2.5.3-1
Total Installed Size: 2.14 MiB
:: Proceed with installation? [Y/n] Y
(1/1) checking keys in keyring [######################################] 100%
(1/1) checking package integrity [######################################] 100%
(1/1) loading package files [######################################] 100%
(1/1) checking for file conflicts [######################################] 100%
(1/1) checking available disk space [######################################] 100%
:: Running pre-transaction hooks...
(1/1) Performing snapper pre snapshots for the following configurations...
=&gt; root: 1033
:: Processing package changes...
(1/1) installing nano [######################################] 100%
:: Running post-transaction hooks...
(1/1) Performing snapper post snapshots for the following configurations...
=&gt; root: 1034
</pre></div>
</div>
<p>The snapper snapshot number is given for each snapper configuration that is used. This
is also logged in pacman’s log.</p>
<p>Here are the snapshots created before and after the pacman transaction:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>snapper -c root list -t pre-post <span class="p">|</span> tail -n <span class="m">1</span>
</pre></div>
</div>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>1033 | 1034 | Fri 22 Apr 2016 01:54:13 PM CDT | Fri 22 Apr 2016 01:54:14 PM CDT | pacman -S nano |
</pre></div>
</div>
<p>Here is what changed during the transaction:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>snapper -c root status <span class="m">1033</span>..1034
</pre></div>
</div>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+..... /etc/nanorc
c..... /etc/snapper/.snap-pac-pre
+..... /usr/bin/nano
+..... /usr/bin/rnano
+..... /usr/share/doc/nano
+..... /usr/share/doc/nano/faq.html
+..... /usr/share/doc/nano/fr
+..... /usr/share/doc/nano/fr/nano.1.html
+..... /usr/share/doc/nano/fr/nanorc.5.html
+..... /usr/share/doc/nano/fr/rnano.1.html
</pre></div>
</div>
<p>The above output is truncated, but it continues. See <em class="manpage"><a class="manpage reference external" href="https://man.archlinux.org/man/snapper.8">snapper(8)</a></em> to for what each
symbol means. You can also do <code class="docutils literal notranslate"><span class="pre">snapper</span> <span class="pre">diff</span></code> in the same way.</p>
<p>Then, to undo the pacman transaction:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>snapper -c root undochange <span class="m">1033</span>..1034
</pre></div>
</div>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>create:0 modify:3 delete:100
</pre></div>
</div>
<p>Now nano is no longer installed, along with all the files it changed:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pacman -Qi nano
</pre></div>
</div>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>error: package &#39;nano&#39; was not found
</pre></div>
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