gst-uninstalled.py 文件源码

def python_env(options, unset_env=False):
    """
    Setup our overrides_hack.py as sitecustomize.py script in user
    site-packages if unset_env=False, else unset, previously set
    env.
    """
    subprojects_path = os.path.join(options.builddir, "subprojects")
    gst_python_path = os.path.join(SCRIPTDIR, "subprojects", "gst-python")
    if not os.path.exists(os.path.join(subprojects_path, "gst-python")) or \
            not os.path.exists(gst_python_path):
        return False

    sitepackages = site.getusersitepackages()
    if not sitepackages:
        return False

    sitecustomize = os.path.join(sitepackages, "sitecustomize.py")
    overrides_hack = os.path.join(gst_python_path, "testsuite", "overrides_hack.py")

    if not unset_env:
        if os.path.exists(sitecustomize):
            if os.path.realpath(sitecustomize) == overrides_hack:
                print("Customize user site script already linked to the GStreamer one")
                return False

            old_sitecustomize = os.path.join(sitepackages,
                                            "old.sitecustomize.gstuninstalled.py")
            shutil.move(sitecustomize, old_sitecustomize)
        elif not os.path.exists(sitepackages):
            os.makedirs(sitepackages)

        os.symlink(overrides_hack, sitecustomize)
        return os.path.realpath(sitecustomize) == overrides_hack
    else:
        if not os.path.realpath(sitecustomize) == overrides_hack:
            return False

        os.remove(sitecustomize)
        old_sitecustomize = os.path.join(sitepackages,
                                            "old.sitecustomize.gstuninstalled.py")

        if os.path.exists(old_sitecustomize):
            shutil.move(old_sitecustomize, sitecustomize)

        return True