title: Conda environment is discoverable but not activateable (when activate is a bash alias)
body: <p>Conda version 4.2.9, from the anaconda3 4.2.0 installation for RedHat 4.4.7-1.</p>
  
  <pre><code>[user@machine]$ conda info --envs
  # conda environments:
  #
  molr-py3                 /home/user/anaconda3/envs/molr-py3
  root                  *  /home/user/anaconda3
  
  [user@machine]$ source activate molr-py3
  CondaEnvironmentNotFoundError: Could not find environment: molr-py3 .
  You can list all discoverable environments with `conda info --envs`.
  </code></pre>
  
  <p>I'm not even sure what debugging steps to take in this case. I've verified that <code>conda</code> comes from the right anaconda path, etc.</p>
  
  <p>I also tried <code>chmod -R a+rwX</code> on the <code>envs</code> directory and then the <code>anaconda3</code> directory, but this had no impact.</p>
  
  <p>All of the different <code>conda-*</code> commands are aliased in .bashrc to point to the versions existing inside <code>anaconda3/bin</code>, so it's not using any <code>anaconda2</code> versions of <code>conda</code> stuff. Additionally, the <code>activate</code> script from <code>anaconda3/bin</code> is aliased to <code>activate</code> so it's not using the <code>anaconda2</code> <code>activate</code> script either.</p>
  
  <p>Output of <code>conda info</code></p>
  
  <pre><code>Current conda install:
  
                 platform : linux-64
            conda version : 4.2.9
         conda is private : False
        conda-env version : 4.2.9
      conda-build version : 2.0.2
           python version : 3.5.2.final.0
         requests version : 2.11.1
         root environment : /home/user/anaconda3  (writable)
      default environment : /home/user/anaconda3
         envs directories : /home/user/anaconda3/envs
            package cache : /home/user/anaconda3/pkgs
             channel URLs : https://repo.continuum.io/pkgs/free/linux-64/
                            https://repo.continuum.io/pkgs/free/noarch/
                            https://repo.continuum.io/pkgs/pro/linux-64/
                            https://repo.continuum.io/pkgs/pro/noarch/
              config file : None
             offline mode : False
  </code></pre>
  
  <p><strong>Update</strong> </p>
  
  <p>If I fully spell out the path to the <code>anaconda3</code> activate script, then it works. E.g. the following will work,</p>
  
  <pre><code>source /home/user/anaconda3/bin/activate molr-py3
  </code></pre>
  
  <p>Even though this is set,</p>
  
  <pre><code>[user@machine]$ which activate
  alias activate='/home/user/anaconda3/bin/activate'
      ~/anaconda3/bin/activate
  </code></pre>
  
  <p>the following does <em>not</em> work,</p>
  
  <pre><code>[user@machine]$ source activate molr-py3
  CondaEnvironmentNotFoundError: Could not find environment: molr-py3 .
  You can list all discoverable environments with `conda info --envs`.
  </code></pre>