Some packaging improvements

* versioneer all the things
* add parse_requirements

1 files changed, 669 insertions, 0 deletions

diff --git a/keymanager/versioneer.py b/keymanager/versioneer.py
new file mode 100644
index 0000000..34e4807
--- /dev/null
+++ b/keymanager/versioneer.py
@@ -0,0 +1,669 @@
+#! /usr/bin/python
+
+"""versioneer.py
+
+(like a rocketeer, but for versions)
+
+* https://github.com/warner/python-versioneer
+* Brian Warner
+* License: Public Domain
+* Version: 0.7+
+
+This file helps distutils-based projects manage their version number by just
+creating version-control tags.
+
+For developers who work from a VCS-generated tree (e.g. 'git clone' etc),
+each 'setup.py version', 'setup.py build', 'setup.py sdist' will compute a
+version number by asking your version-control tool about the current
+checkout. The version number will be written into a generated _version.py
+file of your choosing, where it can be included by your __init__.py
+
+For users who work from a VCS-generated tarball (e.g. 'git archive'), it will
+compute a version number by looking at the name of the directory created when
+te tarball is unpacked. This conventionally includes both the name of the
+project and a version number.
+
+For users who work from a tarball built by 'setup.py sdist', it will get a
+version number from a previously-generated _version.py file.
+
+As a result, loading code directly from the source tree will not result in a
+real version. If you want real versions from VCS trees (where you frequently
+update from the upstream repository, or do new development), you will need to
+do a 'setup.py version' after each update, and load code from the build/
+directory.
+
+You need to provide this code with a few configuration values:
+
+ versionfile_source:
+    A project-relative pathname into which the generated version strings
+    should be written. This is usually a _version.py next to your project's
+    main __init__.py file. If your project uses src/myproject/__init__.py,
+    this should be 'src/myproject/_version.py'. This file should be checked
+    in to your VCS as usual: the copy created below by 'setup.py
+    update_files' will include code that parses expanded VCS keywords in
+    generated tarballs. The 'build' and 'sdist' commands will replace it with
+    a copy that has just the calculated version string.
+
+ versionfile_build:
+    Like versionfile_source, but relative to the build directory instead of
+    the source directory. These will differ when your setup.py uses
+    'package_dir='. If you have package_dir={'myproject': 'src/myproject'},
+    then you will probably have versionfile_build='myproject/_version.py' and
+    versionfile_source='src/myproject/_version.py'.
+
+ tag_prefix: a string, like 'PROJECTNAME-', which appears at the start of all
+             VCS tags. If your tags look like 'myproject-1.2.0', then you
+             should use tag_prefix='myproject-'. If you use unprefixed tags
+             like '1.2.0', this should be an empty string.
+
+ parentdir_prefix: a string, frequently the same as tag_prefix, which
+                   appears at the start of all unpacked tarball filenames. If
+                   your tarball unpacks into 'myproject-1.2.0', this should
+                   be 'myproject-'.
+
+To use it:
+
+ 1: include this file in the top level of your project
+ 2: make the following changes to the top of your setup.py:
+     import versioneer
+     versioneer.versionfile_source = 'src/myproject/_version.py'
+     versioneer.versionfile_build = 'myproject/_version.py'
+     versioneer.tag_prefix = '' # tags are like 1.2.0
+     versioneer.parentdir_prefix = 'myproject-' # dirname like 'myproject-1.2.0'
+ 3: add the following arguments to the setup() call in your setup.py:
+     version=versioneer.get_version(),
+     cmdclass=versioneer.get_cmdclass(),
+ 4: run 'setup.py update_files', which will create _version.py, and will
+    modify your __init__.py to define __version__ (by calling a function
+    from _version.py)
+ 5: modify your MANIFEST.in to include versioneer.py
+ 6: add both versioneer.py and the generated _version.py to your VCS
+"""
+
+import os, sys, re
+from distutils.core import Command
+from distutils.command.sdist import sdist as _sdist
+from distutils.command.build import build as _build
+
+versionfile_source = None
+versionfile_build = None
+tag_prefix = None
+parentdir_prefix = None
+
+VCS = "git"
+IN_LONG_VERSION_PY = False
+
+
+LONG_VERSION_PY = '''
+IN_LONG_VERSION_PY = True
+# This file helps to compute a version number in source trees obtained from
+# git-archive tarball (such as those provided by githubs download-from-tag
+# feature). Distribution tarballs (build by setup.py sdist) and build
+# directories (produced by setup.py build) will contain a much shorter file
+# that just contains the computed version number.
+
+# This file is released into the public domain. Generated by
+# versioneer-0.7+ (https://github.com/warner/python-versioneer)
+
+# these strings will be replaced by git during git-archive
+git_refnames = "%(DOLLAR)sFormat:%%d%(DOLLAR)s"
+git_full = "%(DOLLAR)sFormat:%%H%(DOLLAR)s"
+
+
+import subprocess
+import sys
+
+def run_command(args, cwd=None, verbose=False):
+    try:
+        # remember shell=False, so use git.cmd on windows, not just git
+        p = subprocess.Popen(args, stdout=subprocess.PIPE, cwd=cwd)
+    except EnvironmentError:
+        e = sys.exc_info()[1]
+        if verbose:
+            print("unable to run %%s" %% args[0])
+            print(e)
+        return None
+    stdout = p.communicate()[0].strip()
+    if sys.version >= '3':
+        stdout = stdout.decode()
+    if p.returncode != 0:
+        if verbose:
+            print("unable to run %%s (error)" %% args[0])
+        return None
+    return stdout
+
+
+import sys
+import re
+import os.path
+
+def get_expanded_variables(versionfile_source):
+    # the code embedded in _version.py can just fetch the value of these
+    # variables. When used from setup.py, we don't want to import
+    # _version.py, so we do it with a regexp instead. This function is not
+    # used from _version.py.
+    variables = {}
+    try:
+        f = open(versionfile_source,"r")
+        for line in f.readlines():
+            if line.strip().startswith("git_refnames ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    variables["refnames"] = mo.group(1)
+            if line.strip().startswith("git_full ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    variables["full"] = mo.group(1)
+        f.close()
+    except EnvironmentError:
+        pass
+    return variables
+
+def versions_from_expanded_variables(variables, tag_prefix, verbose=False):
+    refnames = variables["refnames"].strip()
+    if refnames.startswith("$Format"):
+        if verbose:
+            print("variables are unexpanded, not using")
+        return {} # unexpanded, so not in an unpacked git-archive tarball
+    refs = set([r.strip() for r in refnames.strip("()").split(",")])
+    # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
+    # just "foo-1.0". If we see a "tag: " prefix, prefer those.
+    TAG = "tag: "
+    tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
+    if not tags:
+        # Either we're using git < 1.8.3, or there really are no tags. We use
+        # a heuristic: assume all version tags have a digit. The old git %%d
+        # expansion behaves like git log --decorate=short and strips out the
+        # refs/heads/ and refs/tags/ prefixes that would let us distinguish
+        # between branches and tags. By ignoring refnames without digits, we
+        # filter out many common branch names like "release" and
+        # "stabilization", as well as "HEAD" and "master".
+        tags = set([r for r in refs if re.search(r'\d', r)])
+        if verbose:
+            print("discarding '%%s', no digits" %% ",".join(refs-tags))
+    if verbose:
+        print("likely tags: %%s" %% ",".join(sorted(tags)))
+    for ref in sorted(tags):
+        # sorting will prefer e.g. "2.0" over "2.0rc1"
+        if ref.startswith(tag_prefix):
+            r = ref[len(tag_prefix):]
+            if verbose:
+                print("picking %%s" %% r)
+            return { "version": r,
+                     "full": variables["full"].strip() }
+    # no suitable tags, so we use the full revision id
+    if verbose:
+        print("no suitable tags, using full revision id")
+    return { "version": variables["full"].strip(),
+             "full": variables["full"].strip() }
+
+def versions_from_vcs(tag_prefix, versionfile_source, verbose=False):
+    # this runs 'git' from the root of the source tree. That either means
+    # someone ran a setup.py command (and this code is in versioneer.py, so
+    # IN_LONG_VERSION_PY=False, thus the containing directory is the root of
+    # the source tree), or someone ran a project-specific entry point (and
+    # this code is in _version.py, so IN_LONG_VERSION_PY=True, thus the
+    # containing directory is somewhere deeper in the source tree). This only
+    # gets called if the git-archive 'subst' variables were *not* expanded,
+    # and _version.py hasn't already been rewritten with a short version
+    # string, meaning we're inside a checked out source tree.
+
+    try:
+        here = os.path.abspath(__file__)
+    except NameError:
+        # some py2exe/bbfreeze/non-CPython implementations don't do __file__
+        return {} # not always correct
+
+    # versionfile_source is the relative path from the top of the source tree
+    # (where the .git directory might live) to this file. Invert this to find
+    # the root from __file__.
+    root = here
+    if IN_LONG_VERSION_PY:
+        for i in range(len(versionfile_source.split("/"))):
+            root = os.path.dirname(root)
+    else:
+        root = os.path.dirname(here)
+    if not os.path.exists(os.path.join(root, ".git")):
+        if verbose:
+            print("no .git in %%s" %% root)
+        return {}
+
+    GIT = "git"
+    if sys.platform == "win32":
+        GIT = "git.cmd"
+    stdout = run_command([GIT, "describe", "--tags", "--dirty", "--always"],
+                         cwd=root)
+    if stdout is None:
+        return {}
+    if not stdout.startswith(tag_prefix):
+        if verbose:
+            print("tag '%%s' doesn't start with prefix '%%s'" %% (stdout, tag_prefix))
+        return {}
+    tag = stdout[len(tag_prefix):]
+    stdout = run_command([GIT, "rev-parse", "HEAD"], cwd=root)
+    if stdout is None:
+        return {}
+    full = stdout.strip()
+    if tag.endswith("-dirty"):
+        full += "-dirty"
+    return {"version": tag, "full": full}
+
+
+def versions_from_parentdir(parentdir_prefix, versionfile_source, verbose=False):
+    if IN_LONG_VERSION_PY:
+        # We're running from _version.py. If it's from a source tree
+        # (execute-in-place), we can work upwards to find the root of the
+        # tree, and then check the parent directory for a version string. If
+        # it's in an installed application, there's no hope.
+        try:
+            here = os.path.abspath(__file__)
+        except NameError:
+            # py2exe/bbfreeze/non-CPython don't have __file__
+            return {} # without __file__, we have no hope
+        # versionfile_source is the relative path from the top of the source
+        # tree to _version.py. Invert this to find the root from __file__.
+        root = here
+        for i in range(len(versionfile_source.split("/"))):
+            root = os.path.dirname(root)
+    else:
+        # we're running from versioneer.py, which means we're running from
+        # the setup.py in a source tree. sys.argv[0] is setup.py in the root.
+        here = os.path.abspath(sys.argv[0])
+        root = os.path.dirname(here)
+
+    # Source tarballs conventionally unpack into a directory that includes
+    # both the project name and a version string.
+    dirname = os.path.basename(root)
+    if not dirname.startswith(parentdir_prefix):
+        if verbose:
+            print("guessing rootdir is '%%s', but '%%s' doesn't start with prefix '%%s'" %%
+                  (root, dirname, parentdir_prefix))
+        return None
+    return {"version": dirname[len(parentdir_prefix):], "full": ""}
+
+tag_prefix = "%(TAG_PREFIX)s"
+parentdir_prefix = "%(PARENTDIR_PREFIX)s"
+versionfile_source = "%(VERSIONFILE_SOURCE)s"
+
+def get_versions(default={"version": "unknown", "full": ""}, verbose=False):
+    variables = { "refnames": git_refnames, "full": git_full }
+    ver = versions_from_expanded_variables(variables, tag_prefix, verbose)
+    if not ver:
+        ver = versions_from_vcs(tag_prefix, versionfile_source, verbose)
+    if not ver:
+        ver = versions_from_parentdir(parentdir_prefix, versionfile_source,
+                                      verbose)
+    if not ver:
+        ver = default
+    return ver
+
+'''
+
+
+import subprocess
+import sys
+
+def run_command(args, cwd=None, verbose=False):
+    try:
+        # remember shell=False, so use git.cmd on windows, not just git
+        p = subprocess.Popen(args, stdout=subprocess.PIPE, cwd=cwd)
+    except EnvironmentError:
+        e = sys.exc_info()[1]
+        if verbose:
+            print("unable to run %s" % args[0])
+            print(e)
+        return None
+    stdout = p.communicate()[0].strip()
+    if sys.version >= '3':
+        stdout = stdout.decode()
+    if p.returncode != 0:
+        if verbose:
+            print("unable to run %s (error)" % args[0])
+        return None
+    return stdout
+
+
+import sys
+import re
+import os.path
+
+def get_expanded_variables(versionfile_source):
+    # the code embedded in _version.py can just fetch the value of these
+    # variables. When used from setup.py, we don't want to import
+    # _version.py, so we do it with a regexp instead. This function is not
+    # used from _version.py.
+    variables = {}
+    try:
+        f = open(versionfile_source,"r")
+        for line in f.readlines():
+            if line.strip().startswith("git_refnames ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    variables["refnames"] = mo.group(1)
+            if line.strip().startswith("git_full ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    variables["full"] = mo.group(1)
+        f.close()
+    except EnvironmentError:
+        pass
+    return variables
+
+def versions_from_expanded_variables(variables, tag_prefix, verbose=False):
+    refnames = variables["refnames"].strip()
+    if refnames.startswith("$Format"):
+        if verbose:
+            print("variables are unexpanded, not using")
+        return {} # unexpanded, so not in an unpacked git-archive tarball
+    refs = set([r.strip() for r in refnames.strip("()").split(",")])
+    # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
+    # just "foo-1.0". If we see a "tag: " prefix, prefer those.
+    TAG = "tag: "
+    tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
+    if not tags:
+        # Either we're using git < 1.8.3, or there really are no tags. We use
+        # a heuristic: assume all version tags have a digit. The old git %d
+        # expansion behaves like git log --decorate=short and strips out the
+        # refs/heads/ and refs/tags/ prefixes that would let us distinguish
+        # between branches and tags. By ignoring refnames without digits, we
+        # filter out many common branch names like "release" and
+        # "stabilization", as well as "HEAD" and "master".
+        tags = set([r for r in refs if re.search(r'\d', r)])
+        if verbose:
+            print("discarding '%s', no digits" % ",".join(refs-tags))
+    if verbose:
+        print("likely tags: %s" % ",".join(sorted(tags)))
+    for ref in sorted(tags):
+        # sorting will prefer e.g. "2.0" over "2.0rc1"
+        if ref.startswith(tag_prefix):
+            r = ref[len(tag_prefix):]
+            if verbose:
+                print("picking %s" % r)
+            return { "version": r,
+                     "full": variables["full"].strip() }
+    # no suitable tags, so we use the full revision id
+    if verbose:
+        print("no suitable tags, using full revision id")
+    return { "version": variables["full"].strip(),
+             "full": variables["full"].strip() }
+
+def versions_from_vcs(tag_prefix, versionfile_source, verbose=False):
+    # this runs 'git' from the root of the source tree. That either means
+    # someone ran a setup.py command (and this code is in versioneer.py, so
+    # IN_LONG_VERSION_PY=False, thus the containing directory is the root of
+    # the source tree), or someone ran a project-specific entry point (and
+    # this code is in _version.py, so IN_LONG_VERSION_PY=True, thus the
+    # containing directory is somewhere deeper in the source tree). This only
+    # gets called if the git-archive 'subst' variables were *not* expanded,
+    # and _version.py hasn't already been rewritten with a short version
+    # string, meaning we're inside a checked out source tree.
+
+    try:
+        here = os.path.abspath(__file__)
+    except NameError:
+        # some py2exe/bbfreeze/non-CPython implementations don't do __file__
+        return {} # not always correct
+
+    # versionfile_source is the relative path from the top of the source tree
+    # (where the .git directory might live) to this file. Invert this to find
+    # the root from __file__.
+    root = here
+    if IN_LONG_VERSION_PY:
+        for i in range(len(versionfile_source.split("/"))):
+            root = os.path.dirname(root)
+    else:
+        root = os.path.dirname(here)
+    if not os.path.exists(os.path.join(root, ".git")):
+        if verbose:
+            print("no .git in %s" % root)
+        return {}
+
+    GIT = "git"
+    if sys.platform == "win32":
+        GIT = "git.cmd"
+    stdout = run_command([GIT, "describe", "--tags", "--dirty", "--always"],
+                         cwd=root)
+    if stdout is None:
+        return {}
+    if not stdout.startswith(tag_prefix):
+        if verbose:
+            print("tag '%s' doesn't start with prefix '%s'" % (stdout, tag_prefix))
+        return {}
+    tag = stdout[len(tag_prefix):]
+    stdout = run_command([GIT, "rev-parse", "HEAD"], cwd=root)
+    if stdout is None:
+        return {}
+    full = stdout.strip()
+    if tag.endswith("-dirty"):
+        full += "-dirty"
+    return {"version": tag, "full": full}
+
+
+def versions_from_parentdir(parentdir_prefix, versionfile_source, verbose=False):
+    if IN_LONG_VERSION_PY:
+        # We're running from _version.py. If it's from a source tree
+        # (execute-in-place), we can work upwards to find the root of the
+        # tree, and then check the parent directory for a version string. If
+        # it's in an installed application, there's no hope.
+        try:
+            here = os.path.abspath(__file__)
+        except NameError:
+            # py2exe/bbfreeze/non-CPython don't have __file__
+            return {} # without __file__, we have no hope
+        # versionfile_source is the relative path from the top of the source
+        # tree to _version.py. Invert this to find the root from __file__.
+        root = here
+        for i in range(len(versionfile_source.split("/"))):
+            root = os.path.dirname(root)
+    else:
+        # we're running from versioneer.py, which means we're running from
+        # the setup.py in a source tree. sys.argv[0] is setup.py in the root.
+        here = os.path.abspath(sys.argv[0])
+        root = os.path.dirname(here)
+
+    # Source tarballs conventionally unpack into a directory that includes
+    # both the project name and a version string.
+    dirname = os.path.basename(root)
+    if not dirname.startswith(parentdir_prefix):
+        if verbose:
+            print("guessing rootdir is '%s', but '%s' doesn't start with prefix '%s'" %
+                  (root, dirname, parentdir_prefix))
+        return None
+    return {"version": dirname[len(parentdir_prefix):], "full": ""}
+
+import sys
+
+def do_vcs_install(versionfile_source, ipy):
+    GIT = "git"
+    if sys.platform == "win32":
+        GIT = "git.cmd"
+    run_command([GIT, "add", "versioneer.py"])
+    run_command([GIT, "add", versionfile_source])
+    run_command([GIT, "add", ipy])
+    present = False
+    try:
+        f = open(".gitattributes", "r")
+        for line in f.readlines():
+            if line.strip().startswith(versionfile_source):
+                if "export-subst" in line.strip().split()[1:]:
+                    present = True
+        f.close()
+    except EnvironmentError:
+        pass    
+    if not present:
+        f = open(".gitattributes", "a+")
+        f.write("%s export-subst\n" % versionfile_source)
+        f.close()
+        run_command([GIT, "add", ".gitattributes"])
+    
+
+SHORT_VERSION_PY = """
+# This file was generated by 'versioneer.py' (0.7+) from
+# revision-control system data, or from the parent directory name of an
+# unpacked source archive. Distribution tarballs contain a pre-generated copy
+# of this file.
+
+version_version = '%(version)s'
+version_full = '%(full)s'
+def get_versions(default={}, verbose=False):
+    return {'version': version_version, 'full': version_full}
+
+"""
+
+DEFAULT = {"version": "unknown", "full": "unknown"}
+
+def versions_from_file(filename):
+    versions = {}
+    try:
+        f = open(filename)
+    except EnvironmentError:
+        return versions
+    for line in f.readlines():
+        mo = re.match("version_version = '([^']+)'", line)
+        if mo:
+            versions["version"] = mo.group(1)
+        mo = re.match("version_full = '([^']+)'", line)
+        if mo:
+            versions["full"] = mo.group(1)
+    f.close()
+    return versions
+
+def write_to_version_file(filename, versions):
+    f = open(filename, "w")
+    f.write(SHORT_VERSION_PY % versions)
+    f.close()
+    print("set %s to '%s'" % (filename, versions["version"]))
+
+
+def get_best_versions(versionfile, tag_prefix, parentdir_prefix,
+                      default=DEFAULT, verbose=False):
+    # returns dict with two keys: 'version' and 'full'
+    #
+    # extract version from first of _version.py, 'git describe', parentdir.
+    # This is meant to work for developers using a source checkout, for users
+    # of a tarball created by 'setup.py sdist', and for users of a
+    # tarball/zipball created by 'git archive' or github's download-from-tag
+    # feature.
+
+    variables = get_expanded_variables(versionfile_source)
+    if variables:
+        ver = versions_from_expanded_variables(variables, tag_prefix)
+        if ver:
+            if verbose: print("got version from expanded variable %s" % ver)
+            return ver
+
+    ver = versions_from_file(versionfile)
+    if ver:
+        if verbose: print("got version from file %s %s" % (versionfile, ver))
+        return ver
+
+    ver = versions_from_vcs(tag_prefix, versionfile_source, verbose)
+    if ver:
+        if verbose: print("got version from git %s" % ver)
+        return ver
+
+    ver = versions_from_parentdir(parentdir_prefix, versionfile_source, verbose)
+    if ver:
+        if verbose: print("got version from parentdir %s" % ver)
+        return ver
+
+    if verbose: print("got version from default %s" % ver)
+    return default
+
+def get_versions(default=DEFAULT, verbose=False):
+    assert versionfile_source is not None, "please set versioneer.versionfile_source"
+    assert tag_prefix is not None, "please set versioneer.tag_prefix"
+    assert parentdir_prefix is not None, "please set versioneer.parentdir_prefix"
+    return get_best_versions(versionfile_source, tag_prefix, parentdir_prefix,
+                             default=default, verbose=verbose)
+def get_version(verbose=False):
+    return get_versions(verbose=verbose)["version"]
+
+class cmd_version(Command):
+    description = "report generated version string"
+    user_options = []
+    boolean_options = []
+    def initialize_options(self):
+        pass
+    def finalize_options(self):
+        pass
+    def run(self):
+        ver = get_version(verbose=True)
+        print("Version is currently: %s" % ver)
+
+
+class cmd_build(_build):
+    def run(self):
+        versions = get_versions(verbose=True)
+        _build.run(self)
+        # now locate _version.py in the new build/ directory and replace it
+        # with an updated value
+        target_versionfile = os.path.join(self.build_lib, versionfile_build)
+        print("UPDATING %s" % target_versionfile)
+        os.unlink(target_versionfile)
+        f = open(target_versionfile, "w")
+        f.write(SHORT_VERSION_PY % versions)
+        f.close()
+
+class cmd_sdist(_sdist):
+    def run(self):
+        versions = get_versions(verbose=True)
+        self._versioneer_generated_versions = versions
+        # unless we update this, the command will keep using the old version
+        self.distribution.metadata.version = versions["version"]
+        return _sdist.run(self)
+
+    def make_release_tree(self, base_dir, files):
+        _sdist.make_release_tree(self, base_dir, files)
+        # now locate _version.py in the new base_dir directory (remembering
+        # that it may be a hardlink) and replace it with an updated value
+        target_versionfile = os.path.join(base_dir, versionfile_source)
+        print("UPDATING %s" % target_versionfile)
+        os.unlink(target_versionfile)
+        f = open(target_versionfile, "w")
+        f.write(SHORT_VERSION_PY % self._versioneer_generated_versions)
+        f.close()
+
+INIT_PY_SNIPPET = """
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions
+"""
+
+class cmd_update_files(Command):
+    description = "modify __init__.py and create _version.py"
+    user_options = []
+    boolean_options = []
+    def initialize_options(self):
+        pass
+    def finalize_options(self):
+        pass
+    def run(self):
+        ipy = os.path.join(os.path.dirname(versionfile_source), "__init__.py")
+        print(" creating %s" % versionfile_source)
+        f = open(versionfile_source, "w")
+        f.write(LONG_VERSION_PY % {"DOLLAR": "$",
+                                   "TAG_PREFIX": tag_prefix,
+                                   "PARENTDIR_PREFIX": parentdir_prefix,
+                                   "VERSIONFILE_SOURCE": versionfile_source,
+                                   })
+        f.close()
+        try:
+            old = open(ipy, "r").read()
+        except EnvironmentError:
+            old = ""
+        if INIT_PY_SNIPPET not in old:
+            print(" appending to %s" % ipy)
+            f = open(ipy, "a")
+            f.write(INIT_PY_SNIPPET)
+            f.close()
+        else:
+            print(" %s unmodified" % ipy)
+        do_vcs_install(versionfile_source, ipy)
+
+def get_cmdclass():
+    return {'version': cmd_version,
+            'update_files': cmd_update_files,
+            'build': cmd_build,
+            'sdist': cmd_sdist,
+            }