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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<h1>Source code for pylorax.sysutils</h1><div class="highlight"><pre>
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<span></span><span class="c1">#</span>
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<span class="c1"># sysutils.py</span>
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<span class="c1">#</span>
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<span class="c1"># Copyright (C) 2009-2019 Red Hat, Inc.</span>
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<span class="c1">#</span>
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<span class="c1"># This program is free software; you can redistribute it and/or modify</span>
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<span class="c1"># it under the terms of the GNU General Public License as published by</span>
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<span class="c1"># the Free Software Foundation; either version 2 of the License, or</span>
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<span class="c1"># (at your option) any later version.</span>
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<span class="c1">#</span>
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<span class="c1"># This program is distributed in the hope that it will be useful,</span>
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<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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<span class="c1"># GNU General Public License for more details.</span>
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<span class="c1">#</span>
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<span class="c1"># You should have received a copy of the GNU General Public License</span>
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<span class="c1"># along with this program. If not, see <http://www.gnu.org/licenses/>.</span>
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<span class="c1">#</span>
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<span class="c1"># Red Hat Author(s): Martin Gracik <mgracik@redhat.com></span>
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<span class="c1">#</span>
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<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"joinpaths"</span><span class="p">,</span> <span class="s2">"touch"</span><span class="p">,</span> <span class="s2">"replace"</span><span class="p">,</span> <span class="s2">"chown_"</span><span class="p">,</span> <span class="s2">"chmod_"</span><span class="p">,</span> <span class="s2">"remove"</span><span class="p">,</span>
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<span class="s2">"linktree"</span><span class="p">]</span>
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<span class="kn">import</span> <span class="nn">sys</span>
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<span class="kn">import</span> <span class="nn">os</span>
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<span class="kn">import</span> <span class="nn">re</span>
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<span class="kn">import</span> <span class="nn">fileinput</span>
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<span class="kn">import</span> <span class="nn">pwd</span>
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<span class="kn">import</span> <span class="nn">grp</span>
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<span class="kn">import</span> <span class="nn">glob</span>
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<span class="kn">import</span> <span class="nn">shutil</span>
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<span class="kn">import</span> <span class="nn">shlex</span>
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<span class="kn">from</span> <span class="nn">configparser</span> <span class="k">import</span> <span class="n">ConfigParser</span>
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<span class="kn">from</span> <span class="nn">pylorax.executils</span> <span class="k">import</span> <span class="n">runcmd</span>
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<div class="viewcode-block" id="joinpaths"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.joinpaths">[docs]</a><span class="k">def</span> <span class="nf">joinpaths</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
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<span class="n">path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">args</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"follow_symlinks"</span><span class="p">):</span>
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<span class="k">return</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">realpath</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">path</span></div>
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<div class="viewcode-block" id="touch"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.touch">[docs]</a><span class="k">def</span> <span class="nf">touch</span><span class="p">(</span><span class="n">fname</span><span class="p">):</span>
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<span class="c1"># python closes the file when it goes out of scope</span>
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<span class="nb">open</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="s2">"w"</span><span class="p">)</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">""</span><span class="p">)</span></div>
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<div class="viewcode-block" id="replace"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.replace">[docs]</a><span class="k">def</span> <span class="nf">replace</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">find</span><span class="p">,</span> <span class="n">sub</span><span class="p">):</span>
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<span class="n">fin</span> <span class="o">=</span> <span class="n">fileinput</span><span class="o">.</span><span class="n">input</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">inplace</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
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<span class="n">pattern</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="n">find</span><span class="p">)</span>
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<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">fin</span><span class="p">:</span>
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<span class="n">line</span> <span class="o">=</span> <span class="n">pattern</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="n">sub</span><span class="p">,</span> <span class="n">line</span><span class="p">)</span>
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<span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">line</span><span class="p">)</span>
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<span class="n">fin</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>
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<div class="viewcode-block" id="chown_"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.chown_">[docs]</a><span class="k">def</span> <span class="nf">chown_</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">user</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">group</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
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<span class="n">uid</span> <span class="o">=</span> <span class="n">gid</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
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<span class="k">if</span> <span class="n">user</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
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<span class="n">uid</span> <span class="o">=</span> <span class="n">pwd</span><span class="o">.</span><span class="n">getpwnam</span><span class="p">(</span><span class="n">user</span><span class="p">)[</span><span class="mi">2</span><span class="p">]</span>
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<span class="k">if</span> <span class="n">group</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
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<span class="n">gid</span> <span class="o">=</span> <span class="n">grp</span><span class="o">.</span><span class="n">getgrnam</span><span class="p">(</span><span class="n">group</span><span class="p">)[</span><span class="mi">2</span><span class="p">]</span>
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<span class="k">for</span> <span class="n">fname</span> <span class="ow">in</span> <span class="n">glob</span><span class="o">.</span><span class="n">iglob</span><span class="p">(</span><span class="n">path</span><span class="p">):</span>
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<span class="n">os</span><span class="o">.</span><span class="n">chown</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">uid</span><span class="p">,</span> <span class="n">gid</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">recursive</span> <span class="ow">and</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">fname</span><span class="p">):</span>
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<span class="k">for</span> <span class="n">nested</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">fname</span><span class="p">):</span>
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<span class="n">nested</span> <span class="o">=</span> <span class="n">joinpaths</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">nested</span><span class="p">)</span>
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<span class="n">chown_</span><span class="p">(</span><span class="n">nested</span><span class="p">,</span> <span class="n">user</span><span class="p">,</span> <span class="n">group</span><span class="p">,</span> <span class="n">recursive</span><span class="p">)</span></div>
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<div class="viewcode-block" id="chmod_"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.chmod_">[docs]</a><span class="k">def</span> <span class="nf">chmod_</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">mode</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
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<span class="k">for</span> <span class="n">fname</span> <span class="ow">in</span> <span class="n">glob</span><span class="o">.</span><span class="n">iglob</span><span class="p">(</span><span class="n">path</span><span class="p">):</span>
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<span class="n">os</span><span class="o">.</span><span class="n">chmod</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">recursive</span> <span class="ow">and</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">fname</span><span class="p">):</span>
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<span class="k">for</span> <span class="n">nested</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">fname</span><span class="p">):</span>
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<span class="n">nested</span> <span class="o">=</span> <span class="n">joinpaths</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">nested</span><span class="p">)</span>
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<span class="n">chmod_</span><span class="p">(</span><span class="n">nested</span><span class="p">,</span> <span class="n">mode</span><span class="p">,</span> <span class="n">recursive</span><span class="p">)</span></div>
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<span class="k">def</span> <span class="nf">cpfile</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="n">dst</span><span class="p">):</span>
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<span class="n">shutil</span><span class="o">.</span><span class="n">copy2</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="n">dst</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">dst</span><span class="p">):</span>
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<span class="n">dst</span> <span class="o">=</span> <span class="n">joinpaths</span><span class="p">(</span><span class="n">dst</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">src</span><span class="p">))</span>
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<span class="k">return</span> <span class="n">dst</span>
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<span class="k">def</span> <span class="nf">mvfile</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="n">dst</span><span class="p">):</span>
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<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">dst</span><span class="p">):</span>
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<span class="n">dst</span> <span class="o">=</span> <span class="n">joinpaths</span><span class="p">(</span><span class="n">dst</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">src</span><span class="p">))</span>
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<span class="n">os</span><span class="o">.</span><span class="n">rename</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="n">dst</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">dst</span>
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<div class="viewcode-block" id="remove"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.remove">[docs]</a><span class="k">def</span> <span class="nf">remove</span><span class="p">(</span><span class="n">target</span><span class="p">):</span>
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<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">target</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">islink</span><span class="p">(</span><span class="n">target</span><span class="p">):</span>
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<span class="n">shutil</span><span class="o">.</span><span class="n">rmtree</span><span class="p">(</span><span class="n">target</span><span class="p">)</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="n">os</span><span class="o">.</span><span class="n">unlink</span><span class="p">(</span><span class="n">target</span><span class="p">)</span></div>
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<div class="viewcode-block" id="linktree"><a class="viewcode-back" href="../../pylorax.html#pylorax.sysutils.linktree">[docs]</a><span class="k">def</span> <span class="nf">linktree</span><span class="p">(</span><span class="n">src</span><span class="p">,</span> <span class="n">dst</span><span class="p">):</span>
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<span class="n">runcmd</span><span class="p">([</span><span class="s2">"/bin/cp"</span><span class="p">,</span> <span class="s2">"-alx"</span><span class="p">,</span> <span class="n">src</span><span class="p">,</span> <span class="n">dst</span><span class="p">])</span></div>
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<span class="k">def</span> <span class="nf">unquote</span><span class="p">(</span><span class="n">s</span><span class="p">):</span>
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<span class="k">return</span> <span class="s1">' '</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">shlex</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">s</span><span class="p">))</span>
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<span class="k">class</span> <span class="nc">UnquotingConfigParser</span><span class="p">(</span><span class="n">ConfigParser</span><span class="p">):</span>
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<span class="sd">"""A ConfigParser, only with unquoting of the values."""</span>
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<span class="c1"># pylint: disable=arguments-differ</span>
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<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
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<span class="n">ret</span> <span class="o">=</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">ret</span><span class="p">:</span>
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<span class="n">ret</span> <span class="o">=</span> <span class="n">unquote</span><span class="p">(</span><span class="n">ret</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">ret</span>
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<span class="k">def</span> <span class="nf">flatconfig</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
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<span class="sd">"""Use UnquotingConfigParser to read a flat config file (without</span>
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<span class="sd"> section headers) by adding a section header.</span>
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<span class="sd"> """</span>
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<span class="k">with</span> <span class="nb">open</span> <span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">'r'</span><span class="p">)</span> <span class="k">as</span> <span class="n">conffh</span><span class="p">:</span>
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<span class="n">conftext</span> <span class="o">=</span> <span class="s2">"[main]</span><span class="se">\n</span><span class="s2">"</span> <span class="o">+</span> <span class="n">conffh</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
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<span class="n">config</span> <span class="o">=</span> <span class="n">UnquotingConfigParser</span><span class="p">()</span>
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<span class="n">config</span><span class="o">.</span><span class="n">read_string</span><span class="p">(</span><span class="n">conftext</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">config</span><span class="p">[</span><span class="s1">'main'</span><span class="p">]</span>
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<span class="k">def</span> <span class="nf">read_tail</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">size</span><span class="p">):</span>
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<span class="sd">"""Read up to `size` kibibytes from the end of a file"""</span>
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<span class="c1"># NOTE: In py3 text files are unicode, not bytes so we have to open it as bytes</span>
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<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s2">"rb"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">_read_file_end</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">size</span><span class="p">)</span>
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<span class="k">def</span> <span class="nf">_read_file_end</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">size</span><span class="p">):</span>
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<span class="sd">"""Read the end of a file</span>
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<span class="sd"> This skips to the next line to avoid starting in the middle of a unicode character.</span>
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<span class="sd"> And returns "" in the case of a UnicodeDecodeError</span>
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<span class="sd"> """</span>
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<span class="n">f</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
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<span class="n">end</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">tell</span><span class="p">()</span>
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<span class="k">if</span> <span class="n">end</span> <span class="o"><</span> <span class="mi">1024</span> <span class="o">*</span> <span class="n">size</span><span class="p">:</span>
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<span class="n">f</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="n">f</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="n">end</span> <span class="o">-</span> <span class="p">(</span><span class="mi">1024</span> <span class="o">*</span> <span class="n">size</span><span class="p">))</span>
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<span class="n">data</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
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<span class="k">try</span><span class="p">:</span>
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|
<span class="c1"># Find the first newline in the block</span>
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|
<span class="n">newline</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="mi">1</span><span class="o">+</span><span class="n">data</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="sa">b</span><span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="p">),</span> <span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">))</span>
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<span class="n">text</span> <span class="o">=</span> <span class="n">data</span><span class="p">[</span><span class="n">newline</span><span class="p">:]</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">"UTF-8"</span><span class="p">)</span>
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<span class="k">except</span> <span class="ne">UnicodeDecodeError</span><span class="p">:</span>
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|
<span class="k">return</span> <span class="s2">""</span>
|
|
<span class="k">return</span> <span class="n">text</span>
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</pre></div>
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