使用特定的SVN版本时，PIP始终会重新安装软件包 [英] PIP always reinstalls package when using specific SVN revision

问题描述

当指定了特定的SVN版本时，PIP始终下载并安装软件包(大大降低了同步过程的速度).

PIP always downloads and installs a package when a specific SVN revision is specified (slowing the syncing process considerably).

有没有解决的办法?通常pip会检测到该软件包已在环境中安装，并提示您使用--upgrade.

Is there a way around this? Normally pip detects that the package is already installed in the environment and prompts to use --upgrade.

我的pip_requirements文件包含以下行:

My pip_requirements file has the following line:

svn+http://code.djangoproject.com/svn/django/trunk/@16406#egg=Django1.4A

感谢您的帮助！

• 必须将鸡蛋名称指定为确切的python软件包名称.
• 不得使用-e标志.
• 不适用于PIP版本0.7，适用于1.0.2.

• Must specify egg name as exact python package name.
• Must not use -e flag.
• Does not work on PIP version 0.7, works on 1.0.2.

推荐答案

上个周末我实际上是围绕点子进行黑客攻击，我相信我对你的点子困境有解释.问题只是pip本身的局限性.由于安装过程的工作方式，#egg=[egg-name]部分必须正确命名为setup.py的名称kwarg(这是PyPI上的已知名称)中标识的实际项目名称.

I was actually hacking around pip this past weekend and I believe I have the explanation to your pip woes. The problem is just a limitation within pip itself. Due to the way the installation process works the #egg=[egg-name] portion must be named correctly to the actual project's name identified within the setup.py's name kwarg (this is the name known on PyPI).

您的行:

svn+http://code.djangoproject.com/svn/django/trunk/@16406#egg=Django1.4A

应该是:

svn+http://code.djangoproject.com/svn/django/trunk/@16406#egg=django

长答案

据我所知，安装过程实际上会执行以下操作(如果我输入错了，Ian Bicking会让我失望:-P)

Long Answer

The install process actually does the following to my understanding (Ian Bicking strike me down if I'm wrong :-P)

1. 收到您的要求后，它会根据vcs + [url]结构确定链接是它知道的VCS.
2. 它将签出代码到您环境中的临时目录中.
3. 它运行setup.py(我相信egg_info和install都可以)
4. 已检出代码的临时目录已从文件系统中删除

因此，一旦完成第3步并安装了已签出的源代码，Django就被称为django(不区分大小写).但是，如果保留当前的需求行，则pip将搜索Django1.4A.找不到与该名称匹配的软件包，它将再次签出源代码并尝试安装它.

So once step 3 has completed and your checked out source has installed, Django is known to pip as django (case-insensitive). However, if you keep your current requirements line, pip will search for for Django1.4A. Not finding a package matching that name, it will checkout the source code again and attempt to install it.

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