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    managing-a-configuration -
    Debian Live Manual
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  <label class="ocn"><a name="309" href="#309" class="lnkocn">309</a></label>
  <h1 class="norm" id="o309"><a name="309"></a>
    6. Managing a configuration
  </h1>
</div><div class="substance">
  <label class="ocn"><a name="310" href="#310" class="lnkocn">310</a></label>
  <p class="i0" id="o310">
    This chapter explains how to manage a live configuration from initial  creation, through successive revisions and successive releases of both the  <i>live-build</i> software and the live image itself.
  </p>
</div><div class="substance">
  <label class="ocn"><a name="311" href="#311" class="lnkocn">311</a></label>
  <p class="bold" id="o311"><a name="311"></a> <a name="h6.1" id="h6.1"></a>
    <a name="6.1" ></a><a name="h6.1" ></a>6.1 Use auto to manage configuration changes
  </p>
</div><div class="substance">
  <label class="ocn"><a name="312" href="#312" class="lnkocn">312</a></label>
  <p class="i0" id="o312">
    Live configurations rarely are perfect on the first try. You'll likely need  to make a series of revisions until you are satisfied. However,  inconsistencies can creep into your configuration from one revision to the  next if you aren't careful. The main problem is, once a variable is given a  default value, that value will not be recomputed from other variables that  may change in later revisions.
  </p>
</div><div class="substance">
  <label class="ocn"><a name="313" href="#313" class="lnkocn">313</a></label>
  <p class="i0" id="o313">
    For example, when the distribution is first set, many 'dependent' variables  are given default values that suit that distribution. However, if you later  decide to change the distribution, those dependent variables continue to  retain old values that are no longer appropriate.
  </p>
</div><div class="substance">
  <label class="ocn"><a name="314" href="#314" class="lnkocn">314</a></label>
  <p class="i0" id="o314">
    A second, related problem is that if you run <tt>lb config</tt> and then upgrade  to a new version of <i>live-build</i> that has changed one of the variable names,  you will discover this only by manual review of the variables in your  <tt>config/*</tt> files, which you will then need to use to set the appropriate  option again.
  </p>
</div><div class="substance">
  <label class="ocn"><a name="315" href="#315" class="lnkocn">315</a></label>
  <p class="i0" id="o315">
    All of this would be a terrible nuisance if it weren't for auto/* scripts,  simple wrappers to the <tt>lb config</tt>, <tt>lb build</tt> and <tt>lb clean</tt> commands  that are designed to help you manage your configuration. Simply create an  auto/config script containing <tt>lb config</tt> command with all desired  options, and an auto/clean that removes the files containing configuration  variable values, and each time you <tt>lb config</tt> and <tt>lb clean</tt>, these  files will be executed. This will ensure that your configuration is kept  internally consistent from one revision to the next and from one <i>live-build</i>  release to the next (though you will still have to take care and read the  documentation when you upgrade <i>live-build</i> and make adjustments as needed).
  </p>
</div><div class="substance">
  <label class="ocn"><a name="316" href="#316" class="lnkocn">316</a></label>
  <p class="bold" id="o316"><a name="316"></a> <a name="h6.2" id="h6.2"></a>
    <a name="6.2" ></a><a name="h6.2" ></a>6.2 Example auto scripts
  </p>
</div><div class="substance">
  <label class="ocn"><a name="317" href="#317" class="lnkocn">317</a></label>
  <p class="i0" id="o317">
    Use auto script examples such as the following as the starting point for  your new <i>live-build</i> configuration. Take note that when you call the <tt>lb</tt>  command that the auto script wraps, you must specify <tt>noauto</tt> as its  parameter to ensure that the auto script isn't called again,  recursively. Also, don't forget to ensure the scripts are executable  (e.g. <tt>chmod 755 auto/*</tt>).
  </p>
</div><div class="substance">
  <label class="ocn"><a name="318" href="#318" class="lnkocn">318</a></label>
  <p class="i0" id="o318">
    <tt>auto/config</tt>
  </p>
</div><div class="substance">
  <label class="ocn"><a name="319" href="#319" class="lnkocn">319</a></label>
  <p class="code" id="o319">
    #!/bin/sh<br />
lb config noauto \<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;--package-lists "standard" \<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"${@}"<br /><br />
  </p>
</div><div class="substance">
  <label class="ocn"><a name="320" href="#320" class="lnkocn">320</a></label>
  <p class="i0" id="o320">
    <tt>auto/clean</tt>
  </p>
</div><div class="substance">
  <label class="ocn"><a name="321" href="#321" class="lnkocn">321</a></label>
  <p class="code" id="o321">
    #!/bin/sh<br />
lb clean noauto "${@}"<br />
rm -f config/binary config/bootstrap \<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;config/chroot config/common config/source<br />
rm -f binary.log<br /><br />
  </p>
</div><div class="substance">
  <label class="ocn"><a name="322" href="#322" class="lnkocn">322</a></label>
  <p class="i0" id="o322">
    <tt>auto/build</tt>
  </p>
</div><div class="substance">
  <label class="ocn"><a name="323" href="#323" class="lnkocn">323</a></label>
  <p class="code" id="o323">
    #!/bin/sh<br />
lb build noauto "${@}" 2>&1 | tee binary.log<br /><br />
  </p>
</div><div class="substance">
  <label class="ocn"><a name="324" href="#324" class="lnkocn">324</a></label>
  <p class="i0" id="o324">
    We now ship example auto scripts with <i>live-build</i> based on the examples  above. You may copy those as your starting point.
  </p>
</div><div class="substance">
  <label class="ocn"><a name="325" href="#325" class="lnkocn">325</a></label>
  <p class="code" id="o325">
    $ cp /usr/share/live/build/examples/auto/* auto/<br /><br />
  </p>
</div><div class="substance">
  <label class="ocn"><a name="326" href="#326" class="lnkocn">326</a></label>
  <p class="i0" id="o326">
    Edit <tt>auto/config</tt>, changing or adding any options as you see fit. In the  example above, <tt>--package-lists standard</tt> is set to the default  value. Change this to an appropriate value for your image (or delete it if  you want to use the default) and add any additional options in continuation  lines that follow.
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