当依赖性不满足时，安装工具setup.py安装

Question

I have a setup.py that looks a bit (okay, exactly) like this:

#!/usr/bin/env python

from setuptools import setup
import subprocess
import distutils.command.build_py

class BuildWithMake(distutils.command.build_py.build_py):
    """
    Build using make.
    Then do the default build logic.

    """
    def run(self):
        # Call make.
        subprocess.check_call(["make"])

        # Keep installing the Python stuff
        distutils.command.build_py.build_py.run(self)


setup(name="jobTree",
    version="1.0",
    description="Pipeline management software for clusters.",
    author="Benedict Paten",
    author_email="benedict@soe.ucsc.edu",
    url="http://hgwdev.cse.ucsc.edu/~benedict/code/jobTree.html",
    packages=["jobTree", "jobTree.src", "jobTree.test", "jobTree.batchSystems",
    "jobTree.scriptTree"],
    package_dir= {"": ".."},
    install_requires=["sonLib"],
    # Hook the build command to also build with make
    cmdclass={"build_py": BuildWithMake},
    # Install all the executable scripts somewhere on the PATH
    scripts=["bin/jobTreeKill", "bin/jobTreeStatus", 
    "bin/scriptTreeTest_Sort.py", "bin/jobTreeRun", 
    "bin/jobTreeTest_Dependencies.py", "bin/scriptTreeTest_Wrapper.py", 
    "bin/jobTreeStats", "bin/multijob", "bin/scriptTreeTest_Wrapper2.py"])

It installs the package perfectly fine when run with ./setup.py install . However, it does this whether or not the "sonLib" package is installed, ignoring the dependency.

Is this expected behavior? Should a setup.py install blithely proceed if the dependencies are not installed, leaving it up to pip or whatever to install them beforehand? If not, and setup.py install ought to fail when dependencies are absent, what am I doing wrong?

EDIT : Some version information:

Python 2.7.2 (default, Jan 19 2012, 21:40:50) 
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import setuptools
>>> setuptools.__version__
'0.6c12'
>>> 

Answer 1

The default install command for Distutils setup doesn't know anything about dependencies. If you are running that, you're right that dependencies will not be checked.

Just going by what you've show in the setup.py , though, you are using Setuptools for the setup function. The Setuptools install command is declared to run easy_install , which in turn does check and download dependencies.

It is possible you are explicitly invoking the Distutils install , by specifying install --single-version-externally-managed .