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  66   <h1>Source code for nepi.util.environ</h1><div class="highlight"><pre>
  67 <span class="c">#</span>
  68 <span class="c">#    NEPI, a framework to manage network experiments</span>
  69 <span class="c">#    Copyright (C) 2013 INRIA</span>
  70 <span class="c">#</span>
  71 <span class="c">#    This program is free software: you can redistribute it and/or modify</span>
  72 <span class="c">#    it under the terms of the GNU General Public License version 2 as</span>
  73 <span class="c">#    published by the Free Software Foundation;</span>
  74 <span class="c">#</span>
  75 <span class="c">#    This program is distributed in the hope that it will be useful,</span>
  76 <span class="c">#    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
  77 <span class="c">#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
  78 <span class="c">#    GNU General Public License for more details.</span>
  79 <span class="c">#</span>
  80 <span class="c">#    You should have received a copy of the GNU General Public License</span>
  81 <span class="c">#    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
  82 <span class="c">#</span>
  83 <span class="c"># Author: Alina Quereilhac &lt;alina.quereilhac@inria.fr&gt;</span>
  84 <span class="c">#         Martin Ferrari &lt;martin.ferrari@inria.fr&gt;</span>
  85
  86
  87
  88 <span class="kn">import</span> <span class="nn">ctypes</span>
  89 <span class="kn">import</span> <span class="nn">imp</span>
  90 <span class="kn">import</span> <span class="nn">sys</span>
  91
  92 <span class="kn">import</span> <span class="nn">os</span><span class="o">,</span> <span class="nn">os.path</span><span class="o">,</span> <span class="nn">re</span><span class="o">,</span> <span class="nn">signal</span><span class="o">,</span> <span class="nn">shutil</span><span class="o">,</span> <span class="nn">socket</span><span class="o">,</span> <span class="nn">subprocess</span><span class="o">,</span> <span class="nn">tempfile</span>
  93
  94 <span class="n">__all__</span> <span class="o">=</span>  <span class="p">[</span><span class="s">&quot;python&quot;</span><span class="p">,</span> <span class="s">&quot;ssh_path&quot;</span><span class="p">]</span>
  95 <span class="n">__all__</span> <span class="o">+=</span> <span class="p">[</span><span class="s">&quot;rsh&quot;</span><span class="p">,</span> <span class="s">&quot;tcpdump_path&quot;</span><span class="p">,</span> <span class="s">&quot;sshd_path&quot;</span><span class="p">]</span>
  96 <span class="n">__all__</span> <span class="o">+=</span> <span class="p">[</span><span class="s">&quot;execute&quot;</span><span class="p">,</span> <span class="s">&quot;backticks&quot;</span><span class="p">]</span>
  97
  98
  99 <span class="c"># Unittest from Python 2.6 doesn&#39;t have these decorators</span>
 100 <span class="k">def</span> <span class="nf">_bannerwrap</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
 101     <span class="n">name</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">__name__</span>
 102     <span class="k">def</span> <span class="nf">banner</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>
 103         <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s">&quot;*** WARNING: Skipping test </span><span class="si">%s</span><span class="s">: `</span><span class="si">%s</span><span class="s">&#39;</span><span class="se">\n</span><span class="s">&quot;</span> <span class="o">%</span>
 104                 <span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">text</span><span class="p">))</span>
 105         <span class="k">return</span> <span class="bp">None</span>
 106     <span class="k">return</span> <span class="n">banner</span>
 107
 108 <span class="k">def</span> <span class="nf">skip</span><span class="p">(</span><span class="n">text</span><span class="p">):</span>
 109     <span class="k">return</span> <span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">_bannerwrap</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
 110
 111 <span class="k">def</span> <span class="nf">skipUnless</span><span class="p">(</span><span class="n">cond</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
 112     <span class="k">return</span> <span class="p">(</span><span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">_bannerwrap</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">text</span><span class="p">))</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">cond</span> <span class="k">else</span> <span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">f</span>
 113
 114 <span class="k">def</span> <span class="nf">skipIf</span><span class="p">(</span><span class="n">cond</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
 115     <span class="k">return</span> <span class="p">(</span><span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">_bannerwrap</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">text</span><span class="p">))</span> <span class="k">if</span> <span class="n">cond</span> <span class="k">else</span> <span class="k">lambda</span> <span class="n">f</span><span class="p">:</span> <span class="n">f</span>
 116
 117 <span class="k">def</span> <span class="nf">find_bin</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">extra_path</span> <span class="o">=</span> <span class="bp">None</span><span class="p">):</span>
 118     <span class="n">search</span> <span class="o">=</span> <span class="p">[]</span>
 119     <span class="k">if</span> <span class="s">&quot;PATH&quot;</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">:</span>
 120         <span class="n">search</span> <span class="o">+=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">&quot;PATH&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">&quot;:&quot;</span><span class="p">)</span>
 121     <span class="k">for</span> <span class="n">pref</span> <span class="ow">in</span> <span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">,</span> <span class="s">&quot;/usr/&quot;</span><span class="p">,</span> <span class="s">&quot;/usr/local/&quot;</span><span class="p">):</span>
 122         <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="p">(</span><span class="s">&quot;bin&quot;</span><span class="p">,</span> <span class="s">&quot;sbin&quot;</span><span class="p">):</span>
 123             <span class="n">search</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">pref</span> <span class="o">+</span> <span class="n">d</span><span class="p">)</span>
 124     <span class="k">if</span> <span class="n">extra_path</span><span class="p">:</span>
 125         <span class="n">search</span> <span class="o">+=</span> <span class="n">extra_path</span>
 126
 127     <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="n">search</span><span class="p">:</span>
 128             <span class="k">try</span><span class="p">:</span>
 129                 <span class="n">os</span><span class="o">.</span><span class="n">stat</span><span class="p">(</span><span class="n">d</span> <span class="o">+</span> <span class="s">&quot;/&quot;</span> <span class="o">+</span> <span class="n">name</span><span class="p">)</span>
 130                 <span class="k">return</span> <span class="n">d</span> <span class="o">+</span> <span class="s">&quot;/&quot;</span> <span class="o">+</span> <span class="n">name</span>
 131             <span class="k">except</span> <span class="ne">OSError</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
 132                 <span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">errno</span> <span class="o">!=</span> <span class="n">os</span><span class="o">.</span><span class="n">errno</span><span class="o">.</span><span class="n">ENOENT</span><span class="p">:</span>
 133                     <span class="k">raise</span>
 134     <span class="k">return</span> <span class="bp">None</span>
 135
 136 <span class="k">def</span> <span class="nf">find_bin_or_die</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">extra_path</span> <span class="o">=</span> <span class="bp">None</span><span class="p">):</span>
 137     <span class="n">r</span> <span class="o">=</span> <span class="n">find_bin</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
 138     <span class="k">if</span> <span class="ow">not</span> <span class="n">r</span><span class="p">:</span>
 139         <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">((</span><span class="s">&quot;Cannot find `</span><span class="si">%s</span><span class="s">&#39; command, impossible to &quot;</span> <span class="o">+</span>
 140                 <span class="s">&quot;continue.&quot;</span><span class="p">)</span> <span class="o">%</span> <span class="n">name</span><span class="p">)</span>
 141     <span class="k">return</span> <span class="n">r</span>
 142
 143 <span class="k">def</span> <span class="nf">find_bin</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">extra_path</span> <span class="o">=</span> <span class="bp">None</span><span class="p">):</span>
 144     <span class="n">search</span> <span class="o">=</span> <span class="p">[]</span>
 145     <span class="k">if</span> <span class="s">&quot;PATH&quot;</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">:</span>
 146         <span class="n">search</span> <span class="o">+=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">&quot;PATH&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">&quot;:&quot;</span><span class="p">)</span>
 147     <span class="k">for</span> <span class="n">pref</span> <span class="ow">in</span> <span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">,</span> <span class="s">&quot;/usr/&quot;</span><span class="p">,</span> <span class="s">&quot;/usr/local/&quot;</span><span class="p">):</span>
 148         <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="p">(</span><span class="s">&quot;bin&quot;</span><span class="p">,</span> <span class="s">&quot;sbin&quot;</span><span class="p">):</span>
 149             <span class="n">search</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">pref</span> <span class="o">+</span> <span class="n">d</span><span class="p">)</span>
 150     <span class="k">if</span> <span class="n">extra_path</span><span class="p">:</span>
 151         <span class="n">search</span> <span class="o">+=</span> <span class="n">extra_path</span>
 152
 153     <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="n">search</span><span class="p">:</span>
 154             <span class="k">try</span><span class="p">:</span>
 155                 <span class="n">os</span><span class="o">.</span><span class="n">stat</span><span class="p">(</span><span class="n">d</span> <span class="o">+</span> <span class="s">&quot;/&quot;</span> <span class="o">+</span> <span class="n">name</span><span class="p">)</span>
 156                 <span class="k">return</span> <span class="n">d</span> <span class="o">+</span> <span class="s">&quot;/&quot;</span> <span class="o">+</span> <span class="n">name</span>
 157             <span class="k">except</span> <span class="ne">OSError</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
 158                 <span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">errno</span> <span class="o">!=</span> <span class="n">os</span><span class="o">.</span><span class="n">errno</span><span class="o">.</span><span class="n">ENOENT</span><span class="p">:</span>
 159                     <span class="k">raise</span>
 160     <span class="k">return</span> <span class="bp">None</span>
 161
 162 <span class="n">ssh_path</span> <span class="o">=</span> <span class="n">find_bin_or_die</span><span class="p">(</span><span class="s">&quot;ssh&quot;</span><span class="p">)</span>
 163 <span class="n">python_path</span> <span class="o">=</span> <span class="n">find_bin_or_die</span><span class="p">(</span><span class="s">&quot;python&quot;</span><span class="p">)</span>
 164
 165 <span class="c"># Optional tools</span>
 166 <span class="n">rsh_path</span> <span class="o">=</span> <span class="n">find_bin</span><span class="p">(</span><span class="s">&quot;rsh&quot;</span><span class="p">)</span>
 167 <span class="n">tcpdump_path</span> <span class="o">=</span> <span class="n">find_bin</span><span class="p">(</span><span class="s">&quot;tcpdump&quot;</span><span class="p">)</span>
 168 <span class="n">sshd_path</span> <span class="o">=</span> <span class="n">find_bin</span><span class="p">(</span><span class="s">&quot;sshd&quot;</span><span class="p">)</span>
 169
 170 <div class="viewcode-block" id="execute"><a class="viewcode-back" href="../../../_layout/nepi.util.html#nepi.util.environ.execute">[docs]</a><span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="n">cmd</span><span class="p">):</span>
 171     <span class="c"># FIXME: create a global debug variable</span>
 172     <span class="c">#print &quot;[pid %d]&quot; % os.getpid(), &quot; &quot;.join(cmd)</span>
 173     <span class="n">null</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">&quot;/dev/null&quot;</span><span class="p">,</span> <span class="s">&quot;r+&quot;</span><span class="p">)</span>
 174     <span class="n">p</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="n">stdout</span> <span class="o">=</span> <span class="n">null</span><span class="p">,</span> <span class="n">stderr</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">)</span>
 175     <span class="n">out</span><span class="p">,</span> <span class="n">err</span> <span class="o">=</span> <span class="n">p</span><span class="o">.</span><span class="n">communicate</span><span class="p">()</span>
 176     <span class="k">if</span> <span class="n">p</span><span class="o">.</span><span class="n">returncode</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">:</span>
 177         <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;Error executing `</span><span class="si">%s</span><span class="s">&#39;: </span><span class="si">%s</span><span class="s">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="s">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">cmd</span><span class="p">),</span> <span class="n">err</span><span class="p">))</span>
 178 </div>
 179 <div class="viewcode-block" id="backticks"><a class="viewcode-back" href="../../../_layout/nepi.util.html#nepi.util.environ.backticks">[docs]</a><span class="k">def</span> <span class="nf">backticks</span><span class="p">(</span><span class="n">cmd</span><span class="p">):</span>
 180     <span class="n">p</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="n">stdout</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">,</span>
 181             <span class="n">stderr</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">)</span>
 182     <span class="n">out</span><span class="p">,</span> <span class="n">err</span> <span class="o">=</span> <span class="n">p</span><span class="o">.</span><span class="n">communicate</span><span class="p">()</span>
 183     <span class="k">if</span> <span class="n">p</span><span class="o">.</span><span class="n">returncode</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">:</span>
 184         <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">&quot;Error executing `</span><span class="si">%s</span><span class="s">&#39;: </span><span class="si">%s</span><span class="s">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="s">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">cmd</span><span class="p">),</span> <span class="n">err</span><span class="p">))</span>
 185     <span class="k">return</span> <span class="n">out</span>
 186
 187
 188 <span class="c"># SSH stuff</span>
 189 </div>
 190 <span class="k">def</span> <span class="nf">gen_ssh_keypair</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
 191     <span class="n">ssh_keygen</span> <span class="o">=</span> <span class="n">nepi</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">find_bin_or_die</span><span class="p">(</span><span class="s">&quot;ssh-keygen&quot;</span><span class="p">)</span>
 192     <span class="n">args</span> <span class="o">=</span> <span class="p">[</span><span class="n">ssh_keygen</span><span class="p">,</span> <span class="s">&#39;-q&#39;</span><span class="p">,</span> <span class="s">&#39;-N&#39;</span><span class="p">,</span> <span class="s">&#39;&#39;</span><span class="p">,</span> <span class="s">&#39;-f&#39;</span><span class="p">,</span> <span class="n">filename</span><span class="p">]</span>
 193     <span class="k">assert</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span><span class="n">args</span><span class="p">)</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span> <span class="o">==</span> <span class="mi">0</span>
 194     <span class="k">return</span> <span class="n">filename</span><span class="p">,</span> <span class="s">&quot;</span><span class="si">%s</span><span class="s">.pub&quot;</span> <span class="o">%</span> <span class="n">filename</span>
 195
 196 <span class="k">def</span> <span class="nf">add_key_to_agent</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
 197     <span class="n">ssh_add</span> <span class="o">=</span> <span class="n">nepi</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">find_bin_or_die</span><span class="p">(</span><span class="s">&quot;ssh-add&quot;</span><span class="p">)</span>
 198     <span class="n">args</span> <span class="o">=</span> <span class="p">[</span><span class="n">ssh_add</span><span class="p">,</span> <span class="n">filename</span><span class="p">]</span>
 199     <span class="n">null</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="s">&quot;/dev/null&quot;</span><span class="p">,</span> <span class="s">&quot;w&quot;</span><span class="p">)</span>
 200     <span class="k">assert</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="n">stderr</span> <span class="o">=</span> <span class="n">null</span><span class="p">)</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span> <span class="o">==</span> <span class="mi">0</span>
 201     <span class="n">null</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
 202
 203 <span class="k">def</span> <span class="nf">get_free_port</span><span class="p">():</span>
 204     <span class="n">s</span> <span class="o">=</span> <span class="n">socket</span><span class="o">.</span><span class="n">socket</span><span class="p">()</span>
 205     <span class="n">s</span><span class="o">.</span><span class="n">bind</span><span class="p">((</span><span class="s">&quot;127.0.0.1&quot;</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span>
 206     <span class="n">port</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">getsockname</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span>
 207     <span class="k">return</span> <span class="n">port</span>
 208
 209 <span class="n">_SSH_CONF</span> <span class="o">=</span> <span class="s">&quot;&quot;&quot;ListenAddress 127.0.0.1:</span><span class="si">%d</span><span class="s"></span>
 210 <span class="s">Protocol 2</span>
 211 <span class="s">HostKey </span><span class="si">%s</span><span class="s"></span>
 212 <span class="s">UsePrivilegeSeparation no</span>
 213 <span class="s">PubkeyAuthentication yes</span>
 214 <span class="s">PasswordAuthentication no</span>
 215 <span class="s">AuthorizedKeysFile </span><span class="si">%s</span><span class="s"></span>
 216 <span class="s">UsePAM no</span>
 217 <span class="s">AllowAgentForwarding yes</span>
 218 <span class="s">PermitRootLogin yes</span>
 219 <span class="s">StrictModes no</span>
 220 <span class="s">PermitUserEnvironment yes</span>
 221 <span class="s">&quot;&quot;&quot;</span>
 222
 223 <span class="k">def</span> <span class="nf">gen_sshd_config</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">server_key</span><span class="p">,</span> <span class="n">auth_keys</span><span class="p">):</span>
 224     <span class="n">conf</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s">&quot;w&quot;</span><span class="p">)</span>
 225     <span class="n">text</span> <span class="o">=</span> <span class="n">_SSH_CONF</span> <span class="o">%</span> <span class="p">(</span><span class="n">port</span><span class="p">,</span> <span class="n">server_key</span><span class="p">,</span> <span class="n">auth_keys</span><span class="p">)</span>
 226     <span class="n">conf</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
 227     <span class="n">conf</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
 228     <span class="k">return</span> <span class="n">filename</span>
 229
 230 <span class="k">def</span> <span class="nf">gen_auth_keys</span><span class="p">(</span><span class="n">pubkey</span><span class="p">,</span> <span class="n">output</span><span class="p">,</span> <span class="n">environ</span><span class="p">):</span>
 231     <span class="c">#opts = [&#39;from=&quot;127.0.0.1/32&quot;&#39;] # fails in stupid yans setup</span>
 232     <span class="n">opts</span> <span class="o">=</span> <span class="p">[]</span>
 233     <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">environ</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
 234         <span class="n">opts</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s">&#39;environment=&quot;</span><span class="si">%s</span><span class="s">=</span><span class="si">%s</span><span class="s">&quot;&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">k</span><span class="p">,</span> <span class="n">v</span><span class="p">))</span>
 235
 236     <span class="n">lines</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="n">pubkey</span><span class="p">)</span><span class="o">.</span><span class="n">readlines</span><span class="p">()</span>
 237     <span class="n">pubkey</span> <span class="o">=</span> <span class="n">lines</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">split</span><span class="p">()[</span><span class="mi">0</span><span class="p">:</span><span class="mi">2</span><span class="p">]</span>
 238     <span class="n">out</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="n">output</span><span class="p">,</span> <span class="s">&quot;w&quot;</span><span class="p">)</span>
 239     <span class="n">out</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s">&quot;</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="se">\n</span><span class="s">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="s">&quot;,&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">opts</span><span class="p">),</span> <span class="n">pubkey</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">pubkey</span><span class="p">[</span><span class="mi">1</span><span class="p">]))</span>
 240     <span class="n">out</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
 241     <span class="k">return</span> <span class="n">output</span>
 242
 243 <span class="k">def</span> <span class="nf">start_ssh_agent</span><span class="p">():</span>
 244     <span class="n">ssh_agent</span> <span class="o">=</span> <span class="n">nepi</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">find_bin_or_die</span><span class="p">(</span><span class="s">&quot;ssh-agent&quot;</span><span class="p">)</span>
 245     <span class="n">proc</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">([</span><span class="n">ssh_agent</span><span class="p">],</span> <span class="n">stdout</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">)</span>
 246     <span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="n">foo</span><span class="p">)</span> <span class="o">=</span> <span class="n">proc</span><span class="o">.</span><span class="n">communicate</span><span class="p">()</span>
 247     <span class="k">assert</span> <span class="n">proc</span><span class="o">.</span><span class="n">returncode</span> <span class="o">==</span> <span class="mi">0</span>
 248     <span class="n">d</span> <span class="o">=</span> <span class="p">{}</span>
 249     <span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="n">out</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">&quot;</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">):</span>
 250         <span class="n">match</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s">&quot;^(\w+)=([^ ;]+);.*&quot;</span><span class="p">,</span> <span class="n">l</span><span class="p">)</span>
 251         <span class="k">if</span> <span class="ow">not</span> <span class="n">match</span><span class="p">:</span>
 252             <span class="k">continue</span>
 253         <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="o">=</span> <span class="n">match</span><span class="o">.</span><span class="n">groups</span><span class="p">()</span>
 254         <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span>
 255         <span class="n">d</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span>
 256     <span class="k">return</span> <span class="n">d</span>
 257
 258 <span class="k">def</span> <span class="nf">stop_ssh_agent</span><span class="p">(</span><span class="n">data</span><span class="p">):</span>
 259     <span class="c"># No need to gather the pid, ssh-agent knows how to kill itself; after we</span>
 260     <span class="c"># had set up the environment</span>
 261     <span class="n">ssh_agent</span> <span class="o">=</span> <span class="n">nepi</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">find_bin_or_die</span><span class="p">(</span><span class="s">&quot;ssh-agent&quot;</span><span class="p">)</span>
 262     <span class="n">null</span> <span class="o">=</span> <span class="nb">file</span><span class="p">(</span><span class="s">&quot;/dev/null&quot;</span><span class="p">,</span> <span class="s">&quot;w&quot;</span><span class="p">)</span>
 263     <span class="n">proc</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">([</span><span class="n">ssh_agent</span><span class="p">,</span> <span class="s">&quot;-k&quot;</span><span class="p">],</span> <span class="n">stdout</span> <span class="o">=</span> <span class="n">null</span><span class="p">)</span>
 264     <span class="n">null</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
 265     <span class="k">assert</span> <span class="n">proc</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span> <span class="o">==</span> <span class="mi">0</span>
 266     <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">data</span><span class="p">:</span>
 267         <span class="k">del</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="n">k</span><span class="p">]</span>
 268 </pre></div>
 269
 270           </div>
 271         </div>
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 274     </div>
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 276       <h3>Navigation</h3>
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