disable install unless given a destination directory, to allay fears of

people destroying their site-packages directories; this should hold us
until the installer is done and merged... hopefully in 2.7...

also detabify (I should do this more often)

setup.py

@@ -64,8 +64,9 @@ def setup(name=None, author=None, cmdclass=None, **kwargs):
 # globbing on data_files.
 
 from types import StringType
+from distutils.command.install import install
 from distutils.command.install_data import install_data
-from distutils.errors import DistutilsFileError
+from distutils.errors import DistutilsFileError, DistutilsOptionError
 from distutils.util import convert_path
 from glob import glob
 
@@ -115,6 +116,37 @@ class install_data(install_data):
                             (out, _) = self.copy_file(g, dir)
                             self.outfiles.append(out)
 
+class install(install):
+    def finalize_unix (self):
+        if self.install_base is not None or self.install_platbase is not None:
+            if ((self.install_lib is None and
+                 self.install_purelib is None and
+                 self.install_platlib is None) or
+                self.install_headers is None or
+                self.install_scripts is None or
+                self.install_data is None):
+                raise DistutilsOptionError, \
+                      "install-base or install-platbase supplied, but " + \
+                      "installation scheme is incomplete"
+            return
+
+        if self.home is not None:
+            self.install_base = self.install_platbase = self.home
+            self.select_scheme("unix_home")
+        else:
+            if self.prefix is None:
+                if self.exec_prefix is not None:
+                    raise DistutilsOptionError, \
+                          "must not supply exec-prefix without prefix"
+                raise DistutilsOptionError, "must supply installation path"
+            else:
+                if self.exec_prefix is None:
+                    self.exec_prefix = self.prefix
+
+            self.install_base = self.prefix
+            self.install_platbase = self.exec_prefix
+            self.select_scheme("unix_prefix")
+
 AUTHOR = 'Zope Corporation and Contributors'
 ZOPE_ROOT = os.path.abspath(os.getcwd())
 EXTENSIONCLASS_ROOT = os.path.join(ZOPE_ROOT, 'lib', 'Components', 'ExtensionClass')
@@ -988,13 +1020,14 @@ distutils_setup(
     headers=setup_info.get('headers', []),
     ext_modules=setup_info.get('ext_modules', []),
 
-    cmdclass={'install_data': install_data}
+    cmdclass={'install': install, 'install_data': install_data}
 )
 distutils_setup(
     name='Zope',
     author=AUTHOR,
 
-    py_modules=setup_info.get('py_modules', [])
+    py_modules=setup_info.get('py_modules', []),
+    cmdclass={'install': install, 'install_data': install_data}
 )
 setup_info = {}
 
@@ -1071,11 +1104,12 @@ distutils_setup(
     headers=setup_info.get('headers', []),
     ext_modules=setup_info.get('ext_modules', []),
 
-    cmdclass={'install_data': install_data}
+    cmdclass={'install': install, 'install_data': install_data}
 )
 distutils_setup(
     name='Zope',
     author=AUTHOR,
 
-    py_modules=setup_info.get('py_modules', [])
+    py_modules=setup_info.get('py_modules', []),
+    cmdclass={'install': install, 'install_data': install_data}
 )