pip.py 3.21 KB
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#!/usr/bin/env python
# Copyright (c) 2009, Willow Garage, Inc.
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the Willow Garage, Inc. nor the names of its
#       contributors may be used to endorse or promote products derived from
#       this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

# Author Tully Foote/tfoote@willowgarage.com

from __future__ import print_function

import subprocess

from ..core import InstallFailed
from ..installers import PackageManagerInstaller
from ..shell_utils import read_stdout

# pip package manager key
PIP_INSTALLER = 'pip'

def register_installers(context):
    context.set_installer(PIP_INSTALLER, PipInstaller())

def is_pip_installed():
    try:
        subprocess.Popen(['pip'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        return True
    except OSError:
        return False

def pip_detect(pkgs, exec_fn=None):
    """ 
    Given a list of package, return the list of installed packages.

    :param exec_fn: function to execute Popen and read stdout (for testing)
    """
    if exec_fn is None:
        exec_fn = read_stdout
    pkg_list = exec_fn(['pip', 'freeze']).split('\n')

    ret_list = []
    for pkg in pkg_list:
        pkg_row = pkg.split("==")
        if pkg_row[0] in pkgs:
            ret_list.append(pkg_row[0])
    return ret_list

class PipInstaller(PackageManagerInstaller):
    """ 
    :class:`Installer` support for pip.
    """

    def __init__(self):
        super(PipInstaller, self).__init__(pip_detect, supports_depends=True)

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    def get_install_command(self, resolved, interactive=True, reinstall=False, quiet=False):
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        if not is_pip_installed():
            raise InstallFailed((PIP_INSTALLER, "pip is not installed"))
        packages = self.get_packages_to_install(resolved, reinstall=reinstall)
        if not packages:
            return []
        else:
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            return [self.elevate_priv(['pip', 'install', '-U', p]) for p in packages]
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