text: # Copyright 2014 PerfKitBenchmarker Authors. All rights reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  
  """Module containing pip installation and cleanup functions.
  
  Uninstalling the pip package will also remove all python packages
  added after installation.
  """
  
  from perfkitbenchmarker.linux_packages import INSTALL_DIR
  
  
  def _Install(vm):
    """Install pip on the VM."""
    vm.InstallPackages('python-pip')
    vm.RemoteCommand('sudo pip install -U pip')  # Make pip upgrade pip
    vm.RemoteCommand('mkdir -p {0} && pip freeze > {0}/requirements.txt'.format(
        INSTALL_DIR))
  
  
  def YumInstall(vm):
    """Installs the pip package on the VM."""
    vm.InstallEpelRepo()
    _Install(vm)
  
  
  def AptInstall(vm):
    """Installs the pip package on the VM."""
    _Install(vm)
  
  
  def _Uninstall(vm):
    """Uninstalls the pip package on the VM."""
    vm.RemoteCommand('pip freeze | grep --fixed-strings --line-regexp '
                     '--invert-match --file {0}/requirements.txt | '
                     'xargs --no-run-if-empty sudo pip uninstall -y'.format(
                         INSTALL_DIR))
  
  
  def YumUninstall(vm):
    """Uninstalls the pip package on the VM."""
    _Uninstall(vm)
  
  
  def AptUninstall(vm):
    """Uninstalls the pip package on the VM."""
    _Uninstall(vm)
  