Michael Stapelberg
321 lines
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HTML
321 lines
29 KiB
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You can add the gokrazy/mkfs program to your gokrazy instance:">
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You can add the gokrazy/mkfs program to your gokrazy instance:">
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You can add the gokrazy/mkfs program to your gokrazy instance:">
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<li><a href="#create-the-filesystem">Create the filesystem</a></li>
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<li><a href="#permanent-data-in-action">Permanent data in action</a></li>
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<li><a href="#manual-inspectionmodification">Manual inspection/modification</a></li>
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<li><a href="#notes-about-macos">Notes about macOS</a></li>
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<h1 id="access-permanent-data">Access permanent data</h1>
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<h2 id="create-the-filesystem">Create the filesystem<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
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<p>gokrazy provides a handy way to create the permanent data filesystem on the fourth partition of your gokrazy installation.
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The <a href="https://github.com/gokrazy/mkfs" rel="external">gokrazy/mkfs</a> program will create the filesystem.
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To actually access the permanent data partition from your own program, gokrazy will mount the partition under <code>/perm</code> directory during the startup.</p>
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<p>You can add the <code>gokrazy/mkfs</code> program to your gokrazy instance:</p>
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<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>gok add github.com/gokrazy/mkfs</span></span></code></pre></div>
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<p>…or, if you want to run it only once without otherwise including it in your
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installation, you can use <code>gok run</code>:</p>
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<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>git clone https://github.com/gokrazy/mkfs
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</span></span><span style="display:flex;"><span>cd mkfs
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</span></span><span style="display:flex;"><span>gok -i bakery run</span></span></code></pre></div>
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<h2 id="permanent-data-in-action">Permanent data in action<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
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<p>The Go program demonstrates the functionality of the permanent data mount:</p>
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<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-go" data-lang="go"><span style="display:flex;"><span><span style="color:#f92672">package</span> <span style="color:#a6e22e">main</span>
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span><span style="color:#f92672">import</span> (
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</span></span><span style="display:flex;"><span> <span style="color:#e6db74">"encoding/json"</span>
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</span></span><span style="display:flex;"><span> <span style="color:#e6db74">"errors"</span>
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</span></span><span style="display:flex;"><span> <span style="color:#e6db74">"fmt"</span>
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</span></span><span style="display:flex;"><span> <span style="color:#e6db74">"io/fs"</span>
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</span></span><span style="display:flex;"><span> <span style="color:#e6db74">"io/ioutil"</span>
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</span></span><span style="display:flex;"><span> <span style="color:#e6db74">"os"</span>
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</span></span><span style="display:flex;"><span>)
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">const</span> <span style="color:#a6e22e">config</span> = <span style="color:#e6db74">"/perm/my-example/config.json"</span>
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">type</span> <span style="color:#a6e22e">Config</span> <span style="color:#66d9ef">struct</span> {
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</span></span><span style="display:flex;"><span> <span style="color:#a6e22e">FilesToCreate</span> <span style="color:#66d9ef">int</span> <span style="color:#e6db74">`json:"files_to_create"`</span>
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</span></span><span style="display:flex;"><span>}
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span><span style="color:#66d9ef">func</span> <span style="color:#a6e22e">main</span>() {
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</span></span><span style="display:flex;"><span> <span style="color:#a6e22e">_</span>, <span style="color:#a6e22e">err</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">os</span>.<span style="color:#a6e22e">Stat</span>(<span style="color:#a6e22e">config</span>)
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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</span></span><span style="display:flex;"><span> <span style="color:#a6e22e">fsErr</span> <span style="color:#f92672">:=</span> <span style="color:#f92672">&</span><span style="color:#a6e22e">fs</span>.<span style="color:#a6e22e">ErrNotExist</span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> !<span style="color:#a6e22e">errors</span>.<span style="color:#a6e22e">As</span>(<span style="color:#a6e22e">err</span>, <span style="color:#a6e22e">fsErr</span>) {
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</span></span><span style="display:flex;"><span> panic(<span style="color:#a6e22e">err</span>)
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span> <span style="color:#a6e22e">content</span>, <span style="color:#a6e22e">err</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">json</span>.<span style="color:#a6e22e">Marshal</span>(<span style="color:#f92672">&</span><span style="color:#a6e22e">Config</span>{<span style="color:#a6e22e">FilesToCreate</span>: <span style="color:#ae81ff">4</span>})
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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</span></span><span style="display:flex;"><span> panic(<span style="color:#a6e22e">err</span>)
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> = <span style="color:#a6e22e">ioutil</span>.<span style="color:#a6e22e">WriteFile</span>(<span style="color:#a6e22e">config</span>, <span style="color:#a6e22e">content</span>, <span style="color:#ae81ff">0600</span>); <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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</span></span><span style="display:flex;"><span> panic(<span style="color:#a6e22e">err</span>)
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span> <span style="color:#a6e22e">content</span>, <span style="color:#a6e22e">err</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">ioutil</span>.<span style="color:#a6e22e">ReadFile</span>(<span style="color:#a6e22e">config</span>)
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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</span></span><span style="display:flex;"><span> panic(<span style="color:#a6e22e">err</span>)
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">var</span> <span style="color:#a6e22e">c</span> <span style="color:#a6e22e">Config</span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">json</span>.<span style="color:#a6e22e">Unmarshal</span>(<span style="color:#a6e22e">content</span>, <span style="color:#f92672">&</span><span style="color:#a6e22e">c</span>); <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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</span></span><span style="display:flex;"><span> panic(<span style="color:#a6e22e">err</span>)
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">for</span> <span style="color:#a6e22e">i</span> <span style="color:#f92672">:=</span> <span style="color:#ae81ff">0</span>; <span style="color:#a6e22e">i</span> < <span style="color:#a6e22e">c</span>.<span style="color:#a6e22e">FilesToCreate</span>; <span style="color:#a6e22e">i</span><span style="color:#f92672">++</span> {
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> <span style="color:#a6e22e">err</span> <span style="color:#f92672">:=</span> <span style="color:#a6e22e">ioutil</span>.<span style="color:#a6e22e">WriteFile</span>(<span style="color:#a6e22e">fmt</span>.<span style="color:#a6e22e">Sprintf</span>(<span style="color:#e6db74">"/perm/my-example/%d.txt"</span>, <span style="color:#a6e22e">i</span>), []byte(<span style="color:#e6db74">"gokrazy rocks"</span>), <span style="color:#ae81ff">0600</span>); <span style="color:#a6e22e">err</span> <span style="color:#f92672">!=</span> <span style="color:#66d9ef">nil</span> {
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</span></span><span style="display:flex;"><span> panic(<span style="color:#a6e22e">err</span>)
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span> }
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</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>
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<h2 id="manual-inspectionmodification">Manual inspection/modification<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
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<p>You can inspect and modify the data on the permanent data filesystem manually.
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This can be handy if you need e.g. to pass a configuration file for your application.
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To access the filesystem put the SD card into your PC/notebook. Your OS will likely mount the filesystem automatically.
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Copy the file to the permanent data filesystem.</p>
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<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>mkdir /path/to-mounted/filesystem/my-example
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</span></span><span style="display:flex;"><span>sudo cp config.json /path/to-mounted/filesystem/my-example</span></span></code></pre></div>
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<p>If you want to access files on the permanent data filesystem you may need the <a href="https://en.wikipedia.org/wiki/Sudo" rel="external">sudo</a> capability.</p>
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<h2 id="notes-about-macos">Notes about macOS<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
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<p>In macOS, to identify what device file maps to the mini sd card use:</p>
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<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>$ diskutil list</span></span></code></pre></div>
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<p>If you want to create an ext4 filesystem from macOS, use the ext2/3/4 <a href="https://e2fsprogs.sourceforge.net/" rel="external">utilities</a>.
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The easiest way to install them is via <a href="https://formulae.brew.sh/formula/e2fsprogs#default" rel="external">homebrew</a>.</p>
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<p>With the utilities installed you can run (replace X and Y based on the <code>diskutil list</code> output):</p>
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<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>$ sudo <span style="color:#e6db74">`</span>brew --prefix e2fsprogs<span style="color:#e6db74">`</span>/sbin/mkfs.ext4 /dev/diskXsY</span></span></code></pre></div>
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