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<a href="CedarBackup3-module.html">Package CedarBackup3</a> ::
<a href="CedarBackup3.writers-module.html">Package writers</a> ::
Module util
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module util</h1><p class="nomargin-top"><span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html">source code</a></span></p>
<p>Provides utilities related to image writers.</p>
<hr />
<div class="fields"> <p><strong>Author:</strong>
Kenneth J. Pronovici <pronovic@ieee.org>
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<a href="CedarBackup3.writers.util.IsoImage-class.html" class="summary-name">IsoImage</a><br />
Represents an ISO filesystem image.
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<td><span class="summary-sig"><a href="CedarBackup3.writers.util-module.html#validateDevice" class="summary-sig-name">validateDevice</a>(<span class="summary-sig-arg">device</span>,
<span class="summary-sig-arg">unittest</span>=<span class="summary-sig-default">False</span>)</span><br />
Validates a configured device.</td>
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<span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#validateDevice">source code</a></span>
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<td><span class="summary-sig"><a href="CedarBackup3.writers.util-module.html#validateScsiId" class="summary-sig-name">validateScsiId</a>(<span class="summary-sig-arg">scsiId</span>)</span><br />
Validates a SCSI id string.</td>
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<span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#validateScsiId">source code</a></span>
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<td><span class="summary-sig"><a href="CedarBackup3.writers.util-module.html#validateDriveSpeed" class="summary-sig-name">validateDriveSpeed</a>(<span class="summary-sig-arg">driveSpeed</span>)</span><br />
Validates a drive speed value.</td>
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<span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#validateDriveSpeed">source code</a></span>
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<td><span class="summary-sig"><a href="CedarBackup3.writers.util-module.html#readMediaLabel" class="summary-sig-name">readMediaLabel</a>(<span class="summary-sig-arg">devicePath</span>)</span><br />
Reads the media label (volume name) from the indicated device.</td>
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<span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#readMediaLabel">source code</a></span>
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<a name="MKISOFS_COMMAND"></a><span class="summary-name">MKISOFS_COMMAND</span> = <code title="['mkisofs']"><code class="variable-group">[</code><code class="variable-quote">'</code><code class="variable-string">mkisofs</code><code class="variable-quote">'</code><code class="variable-group">]</code></code>
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<a name="VOLNAME_COMMAND"></a><span class="summary-name">VOLNAME_COMMAND</span> = <code title="['volname']"><code class="variable-group">[</code><code class="variable-quote">'</code><code class="variable-string">volname</code><code class="variable-quote">'</code><code class="variable-group">]</code></code>
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<a name="__package__"></a><span class="summary-name">__package__</span> = <code title="'CedarBackup3.writers'"><code class="variable-quote">'</code><code class="variable-string">CedarBackup3.writers</code><code class="variable-quote">'</code></code>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">validateDevice</span>(<span class="sig-arg">device</span>,
<span class="sig-arg">unittest</span>=<span class="sig-default">False</span>)</span>
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<p>Validates a configured device. The device must be an absolute path,
must exist, and must be writable. The unittest flag turns off validation
of the device on disk.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>device</code></strong> - Filesystem device path.</li>
<li><strong class="pname"><code>unittest</code></strong> - Indicates whether we're unit testing.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>Device as a string, for instance
<code>"/dev/cdrw"</code></dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If the device value is invalid.</li>
<li><code><strong class='fraise'>ValueError</strong></code> - If some path cannot be encoded properly.</li>
</ul></dd>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">validateScsiId</span>(<span class="sig-arg">scsiId</span>)</span>
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><span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#validateScsiId">source code</a></span>
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<p>Validates a SCSI id string. SCSI id must be a string in the form
<code>[<method>:]scsibus,target,lun</code>. For Mac OS X (Darwin),
we also accept the form <code>IO.*Services[/N]</code>.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>scsiId</code></strong> - SCSI id for the device.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>SCSI id as a string, for instance
<code>"ATA:1,0,0"</code></dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If the SCSI id string is invalid.</li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
For consistency, if <code>None</code> is passed in,
<code>None</code> will be returned.
</p>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">validateDriveSpeed</span>(<span class="sig-arg">driveSpeed</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#validateDriveSpeed">source code</a></span>
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<p>Validates a drive speed value. Drive speed must be an integer which is
>= 1.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>driveSpeed</code></strong> - Speed at which the drive writes.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>Drive speed as an integer</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If the drive speed value is invalid.</li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
For consistency, if <code>None</code> is passed in,
<code>None</code> will be returned.
</p>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">readMediaLabel</span>(<span class="sig-arg">devicePath</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.writers.util-pysrc.html#readMediaLabel">source code</a></span>
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<p>Reads the media label (volume name) from the indicated device. The
volume name is read using the <code>volname</code> command.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>devicePath</code></strong> - Device path to read from</li>
</ul></dd>
<dt>Returns:</dt>
<dd>Media label as a string, or None if there is no name or it could
not be read.</dd>
</dl>
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