trents_blog/site/posts/debian-11-nspawn-flutter-integration-test-server/index.html
2021-10-18 03:27:50 -07:00

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<h1>Flutter Integration Test Server in Debian 11 Nspawn Container</h1>
<p>date: 2021-09-24</p>
<h2 id="introduction">Introduction</h2>
<h3 id="performance">Performance</h3>
<p>Your Debian Server is way more powerful than your laptop or desktop
and flutter integration_tests suck.</p>
<h3 id="ergonomics">Ergonomics</h3>
<p>You have an Android Emulator (or a real device) connected to the machine
that you are sitting in front of for reference, and now you can run
integration_tests on a different device without having to juggle adb
connections on the same machine.</p>
<h3 id="nspawn-tho">Nspawn Tho?</h3>
<p>Because containers unlike virtual machines access the full power of the
host, but nspawn containers are peristent like virtual machines, sparing
you the cognitive overhead of dealing with the ephemerality of docker
containers and/or of herding cats.</p>
<p>And you already have nspawn, it's build into systemd. Even including the
(virtual) network interfaces.</p>
<h3 id="documentation">Documentation</h3>
<p>Let's face it: setting up an Android Development Environment is a nightmare.</p>
<p>So don't just follow this guide; follow this guide a repetition of three
times, building your own step-by-step guide for yourself as you go. Your brain
will thank you.</p>
<h2 id="host-preparation-debian-11">Host Preparation (Debian 11)</h2>
<ol>
<li>install <code>systemd-container</code> and <code>debootstrap</code></li>
<li>enable unprivileged user namespaces<ul>
<li><code>echo 'kernel.unprivileged_userns_clone=1' &gt;/etc/sysctl.d/nspawn.conf</code></li>
<li><code>systemctl restart systemd-sysctl.service</code></li>
</ul>
</li>
<li>you might as well allow debootstrap to user your apt-cacher-ng proxy<ul>
<li><code>export http_proxy=http://&lt;ip address&gt;:3142</code></li>
</ul>
</li>
</ol>
<h3 id="br0-bridge">br0 bridge</h3>
<p>describe br0 bridge in <code>/etc/systemd/nspawn/ftest.nspawn</code> (optional).
<div class="highlight"><pre><span></span><code><span class="c1"># /etc/systemd/nspawn/ftest.nspawn</span>
<span class="k">[Network]</span>
<span class="na">VirtualEthernet</span><span class="o">=</span><span class="s">yes</span>
<span class="na">Bridge</span><span class="o">=</span><span class="s">br0</span>
</code></pre></div></p>
<h2 id="zfs-mountpoint">ZFS mountpoint</h2>
<p>This is optional, obviously; you might not even use zfs.</p>
<ul>
<li><code>zfs create vm_pool/nspawn/ftest</code></li>
<li><code>zfs set mountpoint=/var/lib/machines/ftest vm_pool/nspawn/ftest</code></li>
<li>sanity check <code>zfs list -r vm_pool/nspawn</code></li>
</ul>
<h2 id="bootstrap-container">bootstrap container</h2>
<div class="highlight"><pre><span></span><code><span class="c1"># for apt-cacher-ng proxy</span>
<span class="nb">export</span> <span class="nv">http_proxy</span><span class="o">=</span>http://&lt;ip address&gt;:3142
debootstrap --include<span class="o">=</span>systemd-container stable /var/list/machines/ftest
</code></pre></div>
<h2 id="preboot-config">preboot config</h2>
<ol>
<li>delete container's package cache</li>
<li>copy <code>/etc/apt/apt.conf</code> to container</li>
<li>copy <code>/root/.bashrc</code> to container</li>
<li>copy <code>/root/.inputrc</code> to container</li>
<li>edit <code>/etc/hostname</code> in container</li>
<li><a href="#br0-bridge">write nspawn file on host</a></li>
<li>copy <code>/etc/locale.gen</code> to <code>/etc/locale.gen.bak</code> on container</li>
</ol>
<h2 id="first-interactive-boot">first interactive boot</h2>
<ol>
<li><code>systemd-nspawn -D /var/lib/machines/ftest -U --machine ftest</code></li>
<li>set passwd: <code>passwd</code></li>
<li>stop container: <code>logout</code></li>
</ol>
<h2 id="run-as-service">run as service</h2>
<ol>
<li><code>systemctl start systemd-nspawn@ftest</code></li>
<li>login: <code>machinectl login ftest</code></li>
<li>start/enable network <code>systemctl enable --now systemd-networkd</code></li>
<li>add regular user <code>useradd &lt;username&gt;</code></li>
</ol>
<h2 id="install-applications">install applications</h2>
<h3 id="locale">locale</h3>
<ul>
<li>install locales</li>
<li>edit <code>/etc/locale.gen</code> to taste and then run the command <code>locale-gen</code></li>
</ul>
<h3 id="essential-apps">essential apps</h3>
<div class="highlight"><pre><span></span><code>apt-get install openssh-server git unzip wget sudo curl file rsync
</code></pre></div>
<h3 id="add-regular-user-to-sudo-group">add regular user to sudo group</h3>
<p><code>usermod -a -G sudo &lt;user&gt;</code></p>
<h3 id="other-apps">other apps</h3>
<div class="highlight"><pre><span></span><code>apt-get install mosh htop haveged byobu needrestart tree bash-completion
</code></pre></div>
<h3 id="install-openjdk-8-from-stretch-repo">install openjdk-8 from stretch repo</h3>
<ol>
<li>add following to <code>/etc/apt/sources.list</code>
<div class="highlight"><pre><span></span><code><span class="na">deb http://security.debian.org/debian-security stretch/updates main</span>
</code></pre></div></li>
<li><code>apt-get update &amp;&amp; apt-get install openjdk-8-jdk-headless</code></li>
</ol>
<h2 id="user-environment">user environment</h2>
<p>You can now ssh into your container.</p>
<p>scp your favorite environment files over to the container</p>
<ul>
<li>~/.byobu/</li>
<li>~/.bashrc</li>
<li>~/.bash_aliases</li>
<li>~/.inputrc</li>
</ul>
<h2 id="install-flutter">install flutter</h2>
<p>Pick a location to taste; I prefer <code>~/.local/</code>
<div class="highlight"><pre><span></span><code><span class="nb">cd</span> <span class="p">;</span> <span class="nb">cd</span> .local
git clone https://github.com/flutter/flutter.git
</code></pre></div></p>
<h3 id="downgrade-flutter">downgrade flutter</h3>
<p>if needed:
<div class="highlight"><pre><span></span><code><span class="nb">cd</span> ~/.local/flutter
git checkout <span class="m">2</span>.2.3
</code></pre></div></p>
<h2 id="install-command-line-tools">install command-line-tools</h2>
<p>The schuck and jive here is absurd, but here goes.</p>
<p>Now is the time to decide where ANDROID_HOME and ANDROID_SDK_ROOT
are going to be; I prefer <code>~/.local/share/Android/Sdk/</code>
<div class="highlight"><pre><span></span><code>mkdir -p ~/.local/share/Android/Sdk
</code></pre></div></p>
<h3 id="temporary-installation-of-cmdline-tools">temporary installation of cmdline-tools</h3>
<p><a href="https://developer.android.com/studio" target="_blank">Command line tools only Scroll half way down</a>
<div class="highlight"><pre><span></span><code><span class="nb">cd</span> ~/.local/share/Android/Sdk
wget https://dl.google.com/android/repository/commandlinetools-linux-7583922_latest.zip
unzip commandlinetools-linux-7583922_latest.zip
mkdir <span class="m">5</span>.0
mv cmdline-tools/* <span class="m">5</span>.0/
mv <span class="m">5</span>.0 cmdline-tools/
</code></pre></div></p>
<h2 id="flutter-and-sdk-environment">flutter and sdk environment</h2>
<p>add the following to <code>~/.bashrc</code>
<div class="highlight"><pre><span></span><code><span class="na">function addToPATH {</span>
<span class="na">case &quot;:$PATH:&quot; in</span>
<span class="na">*&quot;:$1:&quot;*) :;; # already there</span>
<span class="na">*) PATH</span><span class="o">=</span><span class="s">&quot;$PATH:$1&quot;;; # or PATH=&quot;$PATH:$1&quot;</span>
<span class="na">esac</span>
<span class="na">}</span>
<span class="na">addToPATH ~/.local/flutter/bin</span>
<span class="na">addToPATH ~/.local/share/Android/Sdk/cmdline-tools/latest/bin</span>
<span class="na">addToPATH ~/.local/share/Android/Sdk/platform-tools</span>
<span class="c1"># temporary path to temporary version of cmdline-tools</span>
<span class="na">addToPATH ~/.local/share/Android/Sdk/cmdline-tools/5.0/bin</span>
</code></pre></div></p>
<p>add the following to <code>~/.bash_aliases</code>
<div class="highlight"><pre><span></span><code><span class="na">alias sdkmanager</span><span class="o">=</span><span class="s">&#39;sdkmanager --sdk_root=~/.local/share/Android/Sdk&#39;</span>
</code></pre></div></p>
<p>Confirm by logging out and then back in and:
<div class="highlight"><pre><span></span><code>which flutter <span class="p">;</span> which sdkmanager <span class="p">;</span> <span class="nb">alias</span>
</code></pre></div></p>
<h3 id="now-install-cmdline-tools-for-real">now install cmdline-tools for real</h3>
<p><code>sdkmanager --install "cmdline-tools;latest"</code></p>
<p>and then logout and log back in</p>
<h4 id="cleanup">cleanup</h4>
<p>At this point I think you can remove or comment the temporary PATH
statement from <code>~/.bashrc</code> for the temporary location of cmdline-tools</p>
<h2 id="install-android-sdk">install Android SDK</h2>
<p>review your options
<div class="highlight"><pre><span></span><code>sdkmanager --list
</code></pre></div>
and then install them
(platform-tools: adb and fastboot will be pulled in automatically)
<div class="highlight"><pre><span></span><code>sdkmanager --install <span class="s2">&quot;platforms;android-30&quot;</span> <span class="se">\</span>
<span class="s2">&quot;build-tools;31.0.0&quot;</span> <span class="s2">&quot;build-tools;30.0.3&quot;</span>
</code></pre></div></p>
<h2 id="confirm-flutter-installation">confirm flutter installation</h2>
<p><code>flutter doctor</code></p>
<h2 id="run-tests">run tests</h2>
<p>At this point you shoud be able to rsync a flutter app over to the container, connect to a device using network adb,
and run something like:
<div class="highlight"><pre><span></span><code>flutter drive --driver integration_test/driver.dart <span class="se">\</span>
--target integration_test/app_test.dart --profile
</code></pre></div></p>
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