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<a href="CedarBackup3-module.html">Package CedarBackup3</a> ::
Module testutil
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module testutil</h1><p class="nomargin-top"><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html">source code</a></span></p>
<p>Provides unit-testing utilities.</p>
<p>These utilities are kept here, separate from util.py, because they
provide common functionality that I do not want exported
"publicly" once Cedar Backup is installed on a system. They
are only used for unit testing, and are only useful within the source
tree.</p>
<p>Many of these functions are in here because they are "good
enough" for unit test work but are not robust enough to be real
public functions. Others (like <a
href="CedarBackup3.testutil-module.html#removedir"
class="link">removedir</a>) do what they are supposed to, but I don't
want responsibility for making them available to others.</p>
<hr />
<div class="fields"> <p><strong>Author:</strong>
Kenneth J. Pronovici <pronovic@ieee.org>
</p>
</div><!-- ==================== FUNCTIONS ==================== -->
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#findResources" class="summary-sig-name">findResources</a>(<span class="summary-sig-arg">resources</span>,
<span class="summary-sig-arg">dataDirs</span>)</span><br />
Returns a dictionary of locations for various resources.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#commandAvailable" class="summary-sig-name">commandAvailable</a>(<span class="summary-sig-arg">command</span>)</span><br />
Indicates whether a command is available on $PATH somewhere.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#buildPath" class="summary-sig-name">buildPath</a>(<span class="summary-sig-arg">components</span>)</span><br />
Builds a complete path from a list of components.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#removedir" class="summary-sig-name">removedir</a>(<span class="summary-sig-arg">tree</span>)</span><br />
Recursively removes an entire directory.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#extractTar" class="summary-sig-name">extractTar</a>(<span class="summary-sig-arg">tmpdir</span>,
<span class="summary-sig-arg">filepath</span>)</span><br />
Extracts the indicated tar file to the indicated tmpdir.</td>
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<span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#extractTar">source code</a></span>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#changeFileAge" class="summary-sig-name">changeFileAge</a>(<span class="summary-sig-arg">filename</span>,
<span class="summary-sig-arg">subtract</span>=<span class="summary-sig-default">None</span>)</span><br />
Changes a file age using the <code>os.utime</code> function.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#getMaskAsMode" class="summary-sig-name">getMaskAsMode</a>()</span><br />
Returns the user's current umask inverted to a mode.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#getLogin" class="summary-sig-name">getLogin</a>()</span><br />
Returns the name of the currently-logged in user.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#failUnlessAssignRaises" class="summary-sig-name">failUnlessAssignRaises</a>(<span class="summary-sig-arg">testCase</span>,
<span class="summary-sig-arg">exception</span>,
<span class="summary-sig-arg">obj</span>,
<span class="summary-sig-arg">prop</span>,
<span class="summary-sig-arg">value</span>)</span><br />
Equivalent of <code>failUnlessRaises</code>, but used for property
assignments instead.</td>
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<td><span class="summary-sig"><a name="runningAsRoot"></a><span class="summary-sig-name">runningAsRoot</span>()</span><br />
Returns boolean indicating whether the effective user id is root.</td>
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<td><span class="summary-sig"><a name="platformDebian"></a><span class="summary-sig-name">platformDebian</span>()</span><br />
Returns boolean indicating whether this is the Debian platform.</td>
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<td><span class="summary-sig"><a name="platformMacOsX"></a><span class="summary-sig-name">platformMacOsX</span>()</span><br />
Returns boolean indicating whether this is the Mac OS X platform.</td>
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<span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#platformMacOsX">source code</a></span>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#setupDebugLogger" class="summary-sig-name">setupDebugLogger</a>()</span><br />
Sets up a screen logger for debugging purposes.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#setupOverrides" class="summary-sig-name">setupOverrides</a>()</span><br />
Set up any platform-specific overrides that might be required.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#randomFilename" class="summary-sig-name">randomFilename</a>(<span class="summary-sig-arg">length</span>,
<span class="summary-sig-arg">prefix</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">suffix</span>=<span class="summary-sig-default">None</span>)</span><br />
Generates a random filename with the given length.</td>
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<span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#randomFilename">source code</a></span>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#captureOutput" class="summary-sig-name">captureOutput</a>(<span class="summary-sig-arg">c</span>)</span><br />
Captures the output (stdout, stderr) of a function or a method.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#_isPlatform" class="summary-sig-name" onclick="show_private();">_isPlatform</a>(<span class="summary-sig-arg">name</span>)</span><br />
Returns boolean indicating whether we're running on the indicated
platform.</td>
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<td><span class="summary-sig"><a href="CedarBackup3.testutil-module.html#availableLocales" class="summary-sig-name">availableLocales</a>()</span><br />
Returns a list of available locales on the system</td>
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<span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#availableLocales">source code</a></span>
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<!-- ==================== VARIABLES ==================== -->
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<a name="__package__"></a><span class="summary-name">__package__</span> = <code title="'CedarBackup3'"><code class="variable-quote">'</code><code class="variable-string">CedarBackup3</code><code class="variable-quote">'</code></code>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">findResources</span>(<span class="sig-arg">resources</span>,
<span class="sig-arg">dataDirs</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#findResources">source code</a></span>
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<p>Returns a dictionary of locations for various resources.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>resources</code></strong> - List of required resources.</li>
<li><strong class="pname"><code>dataDirs</code></strong> - List of data directories to search within for resources.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>Dictionary mapping resource name to resource path.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>Exception</strong></code> - If some resource cannot be found.</li>
</ul></dd>
</dl>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">commandAvailable</span>(<span class="sig-arg">command</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#commandAvailable">source code</a></span>
</td>
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<p>Indicates whether a command is available on $PATH somewhere. This
should work on both Windows and UNIX platforms.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>command</code></strong> - Commang to search for</li>
</ul></dd>
<dt>Returns:</dt>
<dd>Boolean true/false depending on whether command is available.</dd>
</dl>
</td></tr></table>
</div>
<a name="buildPath"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">buildPath</span>(<span class="sig-arg">components</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#buildPath">source code</a></span>
</td>
</tr></table>
<p>Builds a complete path from a list of components. For instance,
constructs <code>"/a/b/c"</code> from <code>["/a",
"b", "c",]</code>.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>components</code></strong> - List of components.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>String path constructed from components.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If a path cannot be encoded properly.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="removedir"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">removedir</span>(<span class="sig-arg">tree</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#removedir">source code</a></span>
</td>
</tr></table>
<p>Recursively removes an entire directory. This is basically taken from
an example on python.com.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>tree</code></strong> - Directory tree to remove.</li>
</ul></dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If a path cannot be encoded properly.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="extractTar"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">extractTar</span>(<span class="sig-arg">tmpdir</span>,
<span class="sig-arg">filepath</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#extractTar">source code</a></span>
</td>
</tr></table>
<p>Extracts the indicated tar file to the indicated tmpdir.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>tmpdir</code></strong> - Temp directory to extract to.</li>
<li><strong class="pname"><code>filepath</code></strong> - Path to tarfile to extract.</li>
</ul></dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If a path cannot be encoded properly.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="changeFileAge"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">changeFileAge</span>(<span class="sig-arg">filename</span>,
<span class="sig-arg">subtract</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#changeFileAge">source code</a></span>
</td>
</tr></table>
<p>Changes a file age using the <code>os.utime</code> function.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>filename</code></strong> - File to operate on.</li>
<li><strong class="pname"><code>subtract</code></strong> - Number of seconds to subtract from the current time.</li>
</ul></dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - If a path cannot be encoded properly.</li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
Some platforms don't seem to be able to set an age precisely. As a
result, whereas we might have intended to set an age of 86400
seconds, we actually get an age of 86399.375 seconds. When
util.calculateFileAge() looks at that the file, it calculates an
age of 0.999992766204 days, which then gets truncated down to zero
whole days. The tests get very confused. To work around this, I
always subtract off one additional second as a fudge factor. That
way, the file age will be <i>at least</i> as old as requested later
on.
</p>
</div></td></tr></table>
</div>
<a name="getMaskAsMode"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getMaskAsMode</span>()</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#getMaskAsMode">source code</a></span>
</td>
</tr></table>
<p>Returns the user's current umask inverted to a mode. A mode is mostly
a bitwise inversion of a mask, i.e. mask 002 is mode 775.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>Umask converted to a mode, as an integer.</dd>
</dl>
</td></tr></table>
</div>
<a name="getLogin"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">getLogin</span>()</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#getLogin">source code</a></span>
</td>
</tr></table>
<p>Returns the name of the currently-logged in user. This might fail
under some circumstances - but if it does, our tests would fail
anyway.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="failUnlessAssignRaises"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">failUnlessAssignRaises</span>(<span class="sig-arg">testCase</span>,
<span class="sig-arg">exception</span>,
<span class="sig-arg">obj</span>,
<span class="sig-arg">prop</span>,
<span class="sig-arg">value</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#failUnlessAssignRaises">source code</a></span>
</td>
</tr></table>
<p>Equivalent of <code>failUnlessRaises</code>, but used for property
assignments instead.</p>
<p>It's nice to be able to use <code>failUnlessRaises</code> to check
that a method call raises the exception that you expect. Unfortunately,
this method can't be used to check Python propery assignments, even
though these property assignments are actually implemented underneath as
methods.</p>
<p>This function (which can be easily called by unit test classes)
provides an easy way to wrap the assignment checks. It's not pretty, or
as intuitive as the original check it's modeled on, but it does work.</p>
<p>Let's assume you make this method call:</p>
<pre class="literalblock">
testCase.failUnlessAssignRaises(ValueError, collectDir, "absolutePath", absolutePath)
</pre>
<p>If you do this, a test case failure will be raised unless the
assignment:</p>
<pre class="literalblock">
collectDir.absolutePath = absolutePath
</pre>
<p>fails with a <code>ValueError</code> exception. The failure message
differentiates between the case where no exception was raised and the
case where the wrong exception was raised.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>testCase</code></strong> - PyUnit test case object (i.e. self).</li>
<li><strong class="pname"><code>exception</code></strong> - Exception that is expected to be raised.</li>
<li><strong class="pname"><code>obj</code></strong> - Object whose property is to be assigned to.</li>
<li><strong class="pname"><code>prop</code></strong> - Name of the property, as a string.</li>
<li><strong class="pname"><code>value</code></strong> - Value that is to be assigned to the property.</li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
Internally, the <code>missed</code> and <code>instead</code>
variables are used rather than directly calling
<code>testCase.fail</code> upon noticing a problem because the act
of "failure" itself generates an exception that would be
caught by the general <code>except</code> clause.
</p>
<p><strong>See Also:</strong>
<code>unittest.TestCase.failUnlessRaises</code>
</p>
</div></td></tr></table>
</div>
<a name="setupDebugLogger"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setupDebugLogger</span>()</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#setupDebugLogger">source code</a></span>
</td>
</tr></table>
<p>Sets up a screen logger for debugging purposes.</p>
<p>Normally, the CLI functionality configures the logger so that things
get written to the right place. However, for debugging it's sometimes
nice to just get everything -- debug information and output -- dumped to
the screen. This function takes care of that.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="setupOverrides"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">setupOverrides</span>()</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#setupOverrides">source code</a></span>
</td>
</tr></table>
<p>Set up any platform-specific overrides that might be required.</p>
<p>When packages are built, this is done manually (hardcoded) in
customize.py and the overrides are set up in cli.cli(). This way, no
runtime checks need to be done. This is safe, because the package
maintainer knows exactly which platform (Debian or not) the package is
being built for.</p>
<p>Unit tests are different, because they might be run anywhere. So, we
attempt to make a guess about plaform using platformDebian(), and use
that to set up the custom overrides so that platform-specific unit tests
continue to work.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="randomFilename"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">randomFilename</span>(<span class="sig-arg">length</span>,
<span class="sig-arg">prefix</span>=<span class="sig-default">None</span>,
<span class="sig-arg">suffix</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#randomFilename">source code</a></span>
</td>
</tr></table>
<p>Generates a random filename with the given length.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>length</code></strong> - Length of filename. @return Random filename.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="captureOutput"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">captureOutput</span>(<span class="sig-arg">c</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#captureOutput">source code</a></span>
</td>
</tr></table>
<p>Captures the output (stdout, stderr) of a function or a method.</p>
<p>Some of our functions don't do anything other than just print output.
We need a way to test these functions (at least nominally) but we don't
want any of the output spoiling the test suite output.</p>
<p>This function just creates a dummy file descriptor that can be used as
a target by the callable function, rather than <code>stdout</code> or
<code>stderr</code>.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>c</code></strong> - Callable function or method.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>Output of function, as one big string.</dd>
</dl>
<div class="fields"> <p><strong>Note:</strong>
This method assumes that <code>callable</code> doesn't take any
arguments besides keyword argument <code>fd</code> to specify the
file descriptor.
</p>
</div></td></tr></table>
</div>
<a name="_isPlatform"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">_isPlatform</span>(<span class="sig-arg">name</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#_isPlatform">source code</a></span>
</td>
</tr></table>
<p>Returns boolean indicating whether we're running on the indicated
platform.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>name</code></strong> - Platform name to check, currently one of "windows" or
"macosx"</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="availableLocales"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">availableLocales</span>()</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="CedarBackup3.testutil-pysrc.html#availableLocales">source code</a></span>
</td>
</tr></table>
<p>Returns a list of available locales on the system</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>List of string locale names</dd>
</dl>
</td></tr></table>
</div>
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