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<h1 class="logo"><a href="#">snap-pac</a></h1>
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<p class="blurb">pacman hooks that use snapper to create pre/post btrfs snapshots</p>
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<div class="section" id="snap-pac">
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<h1>snap-pac<a class="headerlink" href="#snap-pac" title="Permalink to this headline">¶</a></h1>
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<p>This is a set of <a class="reference external" href="https://archlinux.org/pacman/">pacman</a> hooks and script that causes
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<a class="reference external" href="http://snapper.io/">snapper</a> to automatically take a pre and post snapshot before and
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after pacman transactions, similar to how <a class="reference external" href="https://yast.opensuse.org/">YaST</a> does with
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OpenSuse. This provides a simple way to undo changes to a system after a pacman
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transaction.</p>
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<p>Because these are pacman hooks, it doesn’t matter how you call pacman—whether
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directly, through an AUR helper, or using an alias—snapper will create the snapshots
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when pacman installs, upgrades, or removes a package. The pacman command used is
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logged in the snapper description for the snapshots. Additionally the snapshot numbers
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are output to the screen and to the pacman log for each snapper configuration during the
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pacman transaction, so that the user can easily find which changes he or she may want to
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revert.</p>
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<p>To undo changes from a pacman transaction, use <code class="docutils literal notranslate"><span class="pre">snapper</span> <span class="pre">undochange</span></code>. See the <em class="manpage"><a class="manpage reference external" href="https://man.archlinux.org/man/snapper.8">snapper(8)</a></em>
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for more details as well as examples.</p>
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<p>If you have severe breakage—like snapper is gone for some reason and you can’t get it
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back—you’ll have to resort to more extreme methods, such as taking a snapshot of the pre
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snapshot and making it the default subvolume or mounting it as /. Most likely you’ll
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need to use a live USB to get into a chroot environment to do any of these things.
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Snapper has a <code class="docutils literal notranslate"><span class="pre">snapper</span> <span class="pre">rollback</span></code> feature, but your setup has to be properly configured to
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use it. The exact procedure depends on your specific setup. Be careful.</p>
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<li class="toctree-l1"><a class="reference internal" href="configuration.html">Configuration</a></li>
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<li class="toctree-l1"><a class="reference internal" href="configuration.html#environment-variables">Environment Variables</a></li>
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<li class="toctree-l1"><a class="reference internal" href="examples.html">Example</a></li>
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©2021, Wes Barnett, PhD.
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