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<title> Modificar ficheros de una imagen de disco particionada
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<a href="https://frommelmak.com/modificar-ficheros-de-una-imagen-de-disco-particionada.html" rel="bookmark" title="Permalink to Modificar ficheros de una imagen de disco particionada">Modificar ficheros de una imagen de disco particionada</a>
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<p>En ocasiones disponemos de una imagen <span class="caps">RAW</span> de disco sobre la que queremos realizar cambios, pero queremos ahorrarnos el proceso de: </p>
<ul>
<li>Copiar el fichero de imagen a un dispositivo con ”dd”.</li>
<li>Montar el dispositivo para tener acceso a los filesystems del mismo.</li>
<li>Realizar cambios sobre los ficheros.</li>
<li>Volver a generar el fichero de imagen volcando el contenido de device con dd.</li>
</ul>
<p>Si dispones de una RaspberryPi, seguro que estás cansado de tener que realizar todo este proceso cada vez que quieres hacer cambios sobre algun fichero de la imagen fuente. </p>
<p>Seguro que has escuchado mil veces que en Linux todo es un fichero, incluidos los dispositivos. Pues bien, gracias a esto podemos ahorrarnos el proceso de tener que recurrir a un dispositivo físico, ya que vamos a utilizar un fichero en su lugar.</p>
<p>El procedimiento es tan simple como hacer esto:</p>
<p>Listamos las particiones que contiene el fichero de imagen:</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code>fdisk -l image-file.img
Disk image-file.img: <span class="m">16</span>.0 GB, <span class="m">16012804096</span> bytes
<span class="m">255</span> heads, <span class="m">63</span> sectors/track, <span class="m">1946</span> cylinders, total <span class="m">31275008</span> sectors
<span class="nv">Units</span> <span class="o">=</span> sectors of <span class="m">1</span> * <span class="nv">512</span> <span class="o">=</span> <span class="m">512</span> bytes
Sector size <span class="o">(</span>logical/physical<span class="o">)</span>: <span class="m">512</span> bytes / <span class="m">512</span> bytes
I/O size <span class="o">(</span>minimum/optimal<span class="o">)</span>: <span class="m">512</span> bytes / <span class="m">512</span> bytes
Disk identifier: 0x0009bf4f
Device Boot Start End Blocks Id System
image-file.img1 <span class="m">8192</span> <span class="m">122879</span> <span class="m">57344</span> c W95 FAT32 <span class="o">(</span>LBA<span class="o">)</span>
image-file.img2 <span class="m">122880</span> <span class="m">31275007</span> <span class="m">15576064</span> <span class="m">83</span> Linux
</code></pre></div>
<p>Multiplicamos el tamaño del bloque (512 bytes) por el número de sectores en el que empieza la partición linux.</p>
<p>Utilizaremos este número para montar sólo el filesystem que nos interesa.</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code>sudo mount -o loop,offset<span class="o">=</span><span class="m">62914560</span> image-file.img IMG/
</code></pre></div>
<p>Hacemos los cambios y desmontamos.</p>
<p>Ahora la próxima vez que volquemos la imagen a un dispositivo, los nuevos cambios estarán reflejados.</p>
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