I had an inkling I might be asking the wrong question. It relates to releasing an app that has the following features.
1) Internal package 2) A couple of scripts 3) A dependency on an external package/library (Already packaged in its own right). 4) A couple of dll or equivalent on Unix. We don't want to install into site-packages, we want to keep that clean. We would like to install all the above into one directory structure, and set a python path to poin to the appropriate directory. Almost xcopy installation if that makes sense. I can see two ways of doing this. 1. In a temporary build area build up everything and then package it 2. In the install script, as a post_install action install the external package and the dlls I'm trying to do the second, and as you say its the prefix for where python is installed. I could parse the command line, but that smells it has to be wrong. Advice please? Nick On 3 September 2010 16:38, P.J. Eby <[email protected]> wrote: > At 10:03 AM 9/3/2010 +0100, Nick Leaton wrote: > >> How can I get access to the value of --prefix from code during an install? >> > > If you mean from setup.py, you can't. You would need to subclass one of > the distutils commands and ue the cmdclass argument to setup(). (sys.prefix > is the wrong answer, by the way; it contains the prefix where python was > installed, *not* the prefix being installed to!) > > Even then, you don't want the value of --prefix, because that doesn't > necessarily tell you where something should be installed! Distutils has > multiple installation schemes, many of which don't use --prefix at all. > --prefix is used to calculate various paths, but those paths can be > specified individually, without using a --prefix. > > What's more, when a --root installation is taking place, putting things > under --prefix would break bdist_rpm, bdist_wininst, bdist_msi, and other > bdist_* commands, which are actually installing files to a temporary > location in order to build an installation package, rather than "really" > installing anything. > > In short, you're asking the wrong question, but if you can let us know what > it is you're planning to *do* with this information, there may be an easier > way to go about whatever you're actually trying to accomplish. > > -- Nick
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