如何强制构建使用已安装的包

Question

在服务器上，为了磁盘优化，我们不安装 C 编译器， 这就是问题所在：

我想用 buildout 2.3.1 安装 'spur' python 包， spur 正在使用需要 C 编译器的 pycrypto。

为了避免编译，我在服务器 (Suse 11SP2) 上安装了 rpm python-pycrypto (python-pycrypto-2.6-31.7.x86_64.rpm)。我可以使用“pip freeze”检查是否安装了 pycrypto：

pip freeze 

lxml==2.1.2
mod-python==3.3.1
Numeric==24.2
numpy==1.3.0
pycrypto==2.6
pywbem==0.7.0
PyXML==0.8.4

尽管如此，当我开始构建时，它仍然尝试使用不存在的 C 编译器构建 pycrypto。

所以我在 buildout.cfg 中添加了 include-site-packages = true 和 allowed-eggs-from-site-packages = pycrypto，但没有考虑到它们。 我也尝试过：

python bootstrap.py --allow-site-packages
bin/buildout

但这也无济于事。

如何避免 buildout 编译已经从 rpm 编译和安装的包？

这里是 buildout.cfg

[buildout]
newest = false
extensions = gp.vcsdevelop
develop-dir = src
parts = eggs tests wsgi
include-site-packages = true
allowed-eggs-from-site-packages = pycrypto

eggs =
    Django==1.4.8
    ordereddict
    ipython==0.13.2
    django-webtest
    django-grappelli<2.5.0
    django-bootstrap3-datetimepicker
    z3c.recipe.usercrontab
    rrdgraphs
    south
    achilterm
    pynag
    pyaml<14
    DjangoDevKit==1.0.3
    Sphinx
    xlwt
    xlrd
    spur

...

和日志：

# bin/buildout
Unused options for buildout: 'allowed-eggs-from-site-packages' 'include-site-packages'.
Installing eggs.
Getting distribution for 'pycrypto!=2.4,>=2.1'.
configure: error: in `/tmp/easy_install-QFXca_/pycrypto-2.6.1':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 2254, in main

  File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup
    dist.run_commands()
  File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
    cmd_obj.run()
  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 380, in run

  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 610, in easy_install

  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 659, in install_item

  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 842, in install_eggs

  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 1070, in build_and_install

  File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 1056, in run_setup

  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 240, in run_setup
  File "/usr/lib64/python2.6/contextlib.py", line 34, in __exit__
    self.gen.throw(type, value, traceback)
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 193, in setup_context
  File "/usr/lib64/python2.6/contextlib.py", line 34, in __exit__
    self.gen.throw(type, value, traceback)
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 164, in save_modules
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 139, in resume
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 152, in save_modules
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 193, in setup_context
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 237, in run_setup
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 267, in run
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 236, in runner
  File "build/bdist.linux-x86_64/egg/setuptools/sandbox.py", line 46, in _execfile
  File "/tmp/easy_install-QFXca_/pycrypto-2.6.1/setup.py", line 456, in <module>
  File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup
    dist.run_commands()
  File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
    cmd_obj.run()
  File "build/bdist.linux-x86_64/egg/setuptools/command/bdist_egg.py", line 160, in run
  File "build/bdist.linux-x86_64/egg/setuptools/command/bdist_egg.py", line 146, in call_command
  File "/usr/lib64/python2.6/distutils/cmd.py", line 333, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
    cmd_obj.run()
  File "build/bdist.linux-x86_64/egg/setuptools/command/install_lib.py", line 10, in run
  File "/usr/lib64/python2.6/distutils/command/install_lib.py", line 112, in build
    self.run_command('build_ext')
  File "/usr/lib64/python2.6/distutils/cmd.py", line 333, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
    cmd_obj.run()
  File "/tmp/easy_install-QFXca_/pycrypto-2.6.1/setup.py", line 251, in run
  File "/usr/lib64/python2.6/distutils/cmd.py", line 333, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
    cmd_obj.run()
  File "/tmp/easy_install-QFXca_/pycrypto-2.6.1/setup.py", line 278, in run
RuntimeError: autoconf error
An error occurred when trying to install pycrypto 2.6.1. Look above this message for any errors that were output by easy_install.
While:
  Installing eggs.
  Getting distribution for 'pycrypto!=2.4,>=2.1'.
Error: Couldn't install: pycrypto 2.6.1

Answer 1

我找到了解决方法：

我刚刚在 develop-eggs 目录中创建了一个 egg-link 文件：

$ cat develop-eggs/pycrypto.egg-link 
/usr/lib64/python2.6/site-packages

Answer 2

我没有证据表明 zc.buildout > 1.7.1 支持include-site-packages，也不支持allowed-eggs-from-site-packages。

在我的本地机器上，我在以下版本的 zc.buildout 中搜索了上述功能：

• zc.buildout-1.4.4-py2.7.egg
• zc.buildout-1.6.3-py2.7.egg
• zc.buildout-1.7.1-py2.7.egg
• zc.buildout-2.0.0-py2.7.egg
• zc.buildout-2.0.1-py2.7.egg
• zc.buildout-2.1.0-py2.7.egg
• zc.buildout-2.2.0-py2.7.egg
• zc.buildout-2.2.1-py2.7.egg
• zc.buildout-2.2.3-py2.7.egg
• zc.buildout-2.2.4-py2.7.egg
• zc.buildout-2.2.5-py2.7.egg
• zc.buildout-2.3.0-py2.7.egg
• zc.buildout-2.3.1-py2.7.egg

查看https://pypi.python.org/pypi/zc.buildout/1.7.1 上的自述文件。这些功能是在 zc.buildout 1.5.0 左右引入的。支持这些功能的最后一个版本是 1.7.1。

他们使用 zc.buildout 2.0.0 进行了某种重新启动...

引自 changlog，2.0.0 版：

这是一个向后不兼容的 buildout 版本，它试图纠正 buildout 1 中的错误。

Buildout 不再尝试提供与系统 Python 安装的完全或部分隔离。如果您想要隔离，请使用带有 virtualenv 的 buildout，或者使用干净的 Python 构建开始。

这意味着，如果您想使用这些功能，您需要使用zc.buildout 1.7.1。

同样重要的是，不能同时使用这两个选项。使用allowed-eggs-from-site-packages (only specific packages)，或include-site-packages。

我假设您使用的是 boostrap.py 版本 1：http://downloads.buildout.org/1/bootstrap.py

此版本不支持“--allow-site-packages”选项，因为它旨在与处理这种情况的 zc.buildout 1.x（或至少 1.5.x）一起使用。

---

好吧，经过这次建设历史的短暂旅行，我想以下两点将解决您的问题：

• 确保您使用的是 boostrap.py 2：https://bootstrap.pypa.io/bootstrap-buildout.py。只有这个版本支持--allow-site-packages 选项。
• 确保您使用适合您的 boostrap.py 版本的 zc.buildout 版本。

然后python bootstrap.py --allow-site-packages 按预期工作。