versioneer.py

# Version: 0.10

"""
## Installation

First, decide on values for the following configuration variables:

* `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 versioneer` 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-'.

This tool provides one script, named `versioneer-installer`. That script does
one thing: write a copy of `versioneer.py` into the current directory.

To versioneer-enable your project:

* 1: Run `versioneer-installer` to copy `versioneer.py` into the top of your
  source tree.

* 2: add the following lines to the top of your `setup.py`, with the
  configuration values you decided earlier:

        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: now run `setup.py versioneer`, which will create `_version.py`, and
  will modify your `__init__.py` to define `__version__` (by calling a
  function from `_version.py`). It will also modify your `MANIFEST.in` to
  include both `versioneer.py` and the generated `_version.py` in sdist
  tarballs.

* 5: commit these changes to your VCS. To make sure you won't forget,
  `setup.py versioneer` will mark everything it touched for addition.

## Post-Installation Usage

Once established, all uses of your tree from a VCS checkout should get the
current version string. All generated tarballs should include an embedded
version string (so users who unpack them will not need a VCS tool installed).

If you distribute your project through PyPI, then the release process should
boil down to two steps:

* 1: git tag 1.0
* 2: python setup.py register sdist upload

If you distribute it through github (i.e. users use github to generate
tarballs with `git archive`), the process is:

* 1: git tag 1.0
* 2: git push; git push --tags

Currently, all version strings must be based upon a tag. Versioneer will
report "unknown" until your tree has at least one tag in its history. This
restriction will be fixed eventually (see issue #12).

## Version-String Flavors

Code which uses Versioneer can learn about its version string at runtime by
importing `_version` from your main `__init__.py` file and running the
`get_versions()` function. From the "outside" (e.g. in `setup.py`), you can
import the top-level `versioneer.py` and run `get_versions()`.

Both functions return a dictionary with different keys for different flavors
of the version string:

* `['version']`: condensed tag+distance+shortid+dirty identifier. For git,
  this uses the output of `git describe --tags --dirty --always` but strips
  the tag_prefix. For example "0.11-2-g1076c97-dirty" indicates that the tree
  is like the "1076c97" commit but has uncommitted changes ("-dirty"), and
  that this commit is two revisions ("-2-") beyond the "0.11" tag. For
  released software (exactly equal to a known tag), the identifier will only
  contain the stripped tag, e.g. "0.11".

* `['full']`: detailed revision identifier. For Git, this is the full SHA1
  commit id, followed by "-dirty" if the tree contains uncommitted changes,
  e.g. "1076c978a8d3cfc70f408fe5974aa6c092c949ac-dirty".

Some variants are more useful than others. Including `full` in a bug report
should allow developers to reconstruct the exact code being tested (or
indicate the presence of local changes that should be shared with the
developers). `version` is suitable for display in an "about" box or a CLI
`--version` output: it can be easily compared against release notes and lists
of bugs fixed in various releases.

In the future, this will also include a
[PEP-0440](http://legacy.python.org/dev/peps/pep-0440/) -compatible flavor
(e.g. `1.2.post0.dev123`). This loses a lot of information (and has no room
for a hash-based revision id), but is safe to use in a `setup.py`
"`version=`" argument. It also enables tools like *pip* to compare version
strings and evaluate compatibility constraint declarations.

The `setup.py versioneer` command adds the following text to your
`__init__.py` to place a basic version in `YOURPROJECT.__version__`:

    from ._version import get_versions
    __version = get_versions()['version']
    del get_versions

## Updating Versioneer

To upgrade your project to a new release of Versioneer, do the following:

* install the new Versioneer (`pip install -U versioneer` or equivalent)
* re-run `versioneer-installer` in your source tree to replace `versioneer.py`
* edit `setup.py`, if necessary, to include any new configuration settings indicated by the release notes
* re-run `setup.py versioneer` to replace `SRC/_version.py`
* commit any changed files

## Future Directions

This tool is designed to make it easily extended to other version-control
systems: all VCS-specific components are in separate directories like
src/git/ . The top-level `versioneer.py` script is assembled from these
components by running make-versioneer.py . In the future, make-versioneer.py
will take a VCS name as an argument, and will construct a version of
`versioneer.py` that is specific to the given VCS. It might also take the
configuration arguments that are currently provided manually during
installation by editing setup.py . Alternatively, it might go the other
direction and include code from all supported VCS systems, reducing the
number of intermediate scripts.


## License

To make Versioneer easier to embed, all its code is hereby released into the
public domain. The `_version.py` that it creates is also in the public
domain.

"""

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"


LONG_VERSION_PY = '''
# 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-0.10 (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
import errno


def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False):
    assert isinstance(commands, list)
    p = None
    for c in commands:
        try:
            # remember shell=False, so use git.cmd on windows, not just git
            p = subprocess.Popen([c] + args, cwd=cwd, stdout=subprocess.PIPE,
                                 stderr=(subprocess.PIPE if hide_stderr
                                         else None))
            break
        except EnvironmentError:
            e = sys.exc_info()[1]
            if e.errno == errno.ENOENT:
                continue
            if verbose:
                print("unable to run %%s" %% args[0])
                print(e)
            return None
    else:
        if verbose:
            print("unable to find command, tried %%s" %% (commands,))
        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_abs):
    # 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_abs,"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, root, verbose=False):
    # this runs 'git' from the root of 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.

    if not os.path.exists(os.path.join(root, ".git")):
        if verbose:
            print("no .git in %%s" %% root)
        return {}

    GITS = ["git"]
    if sys.platform == "win32":
        GITS = ["git.cmd", "git.exe"]
    stdout = run_command(GITS, ["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(GITS, ["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, root, verbose=False):
    # 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):
    # I am in _version.py, which lives at ROOT/VERSIONFILE_SOURCE. If we have
    # __file__, we can work backwards from there to the root. Some
    # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
    # case we can only use expanded variables.

    variables = { "refnames": git_refnames, "full": git_full }
    ver = versions_from_expanded_variables(variables, tag_prefix, verbose)
    if ver:
        return ver

    try:
        root = os.path.abspath(__file__)
        # 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__.
        for i in range(len(versionfile_source.split("/"))):
            root = os.path.dirname(root)
    except NameError:
        return default

    return (versions_from_vcs(tag_prefix, root, verbose)
            or versions_from_parentdir(parentdir_prefix, root, verbose)
            or default)

'''


import subprocess
import sys
import errno


def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False):
    assert isinstance(commands, list)
    p = None
    for c in commands:
        try:
            # remember shell=False, so use git.cmd on windows, not just git
            p = subprocess.Popen([c] + args, cwd=cwd, stdout=subprocess.PIPE,
                                 stderr=(subprocess.PIPE if hide_stderr
                                         else None))
            break
        except EnvironmentError:
            e = sys.exc_info()[1]
            if e.errno == errno.ENOENT:
                continue
            if verbose:
                print("unable to run %s" % args[0])
                print(e)
            return None
    else:
        if verbose:
            print("unable to find command, tried %s" % (commands,))
        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_abs):
    # 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_abs,"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, root, verbose=False):
    # this runs 'git' from the root of 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.

    if not os.path.exists(os.path.join(root, ".git")):
        if verbose:
            print("no .git in %s" % root)
        return {}

    GITS = ["git"]
    if sys.platform == "win32":
        GITS = ["git.cmd", "git.exe"]
    stdout = run_command(GITS, ["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(GITS, ["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, root, verbose=False):
    # 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 os.path
import sys

# os.path.relpath only appeared in Python-2.6 . Define it here for 2.5.
def os_path_relpath(path, start=os.path.curdir):
    """Return a relative version of a path"""

    if not path:
        raise ValueError("no path specified")

    start_list = [x for x in os.path.abspath(start).split(os.path.sep) if x]
    path_list = [x for x in os.path.abspath(path).split(os.path.sep) if x]

    # Work out how much of the filepath is shared by start and path.
    i = len(os.path.commonprefix([start_list, path_list]))

    rel_list = [os.path.pardir] * (len(start_list)-i) + path_list[i:]
    if not rel_list:
        return os.path.curdir
    return os.path.join(*rel_list)

def do_vcs_install(manifest_in, versionfile_source, ipy):
    GITS = ["git"]
    if sys.platform == "win32":
        GITS = ["git.cmd", "git.exe"]
    files = [manifest_in, versionfile_source, ipy]
    try:
        me = __file__
        if me.endswith(".pyc") or me.endswith(".pyo"):
            me = os.path.splitext(me)[0] + ".py"
        versioneer_file = os_path_relpath(me)
    except NameError:
        versioneer_file = "versioneer.py"
    files.append(versioneer_file)
    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()
        files.append(".gitattributes")
    run_command(GITS, ["add", "--"] + files)

SHORT_VERSION_PY = """
# This file was generated by 'versioneer.py' (0.10) 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_root():
    try:
        return os.path.dirname(os.path.abspath(__file__))
    except NameError:
        return os.path.dirname(os.path.abspath(sys.argv[0]))

def get_versions(default=DEFAULT, verbose=False):
    # returns dict with two keys: 'version' and 'full'
    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"
    # I am in versioneer.py, which must live at the top of the source tree,
    # which we use to compute the root directory. py2exe/bbfreeze/non-CPython
    # don't have __file__, in which case we fall back to sys.argv[0] (which
    # ought to be the setup.py script). We prefer __file__ since that's more
    # robust in cases where setup.py was invoked in some weird way (e.g. pip)
    root = get_root()
    versionfile_abs = os.path.join(root, versionfile_source)

    # 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_abs)
    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_abs)
    if ver:
        if verbose: print("got version from file %s %s" % (versionfile_abs,ver))
        return ver

    ver = versions_from_vcs(tag_prefix, root, verbose)
    if ver:
        if verbose: print("got version from git %s" % ver)
        return ver

    ver = versions_from_parentdir(parentdir_prefix, root, 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_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()

if 'cx_Freeze' in sys.modules:  # cx_freeze enabled?
    from cx_Freeze.dist import build_exe as _build_exe

    class cmd_build_exe(_build_exe):
        def run(self):
            versions = get_versions(verbose=True)
            target_versionfile = versionfile_source
            print("UPDATING %s" % target_versionfile)
            os.unlink(target_versionfile)
            f = open(target_versionfile, "w")
            f.write(SHORT_VERSION_PY % versions)
            f.close()
            _build_exe.run(self)
            os.unlink(target_versionfile)
            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()

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 = "install/upgrade Versioneer files: __init__.py SRC/_version.py"
    user_options = []
    boolean_options = []
    def initialize_options(self):
        pass
    def finalize_options(self):
        pass
    def run(self):
        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()

        ipy = os.path.join(os.path.dirname(versionfile_source), "__init__.py")
        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)

        # Make sure both the top-level "versioneer.py" and versionfile_source
        # (PKG/_version.py, used by runtime code) are in MANIFEST.in, so
        # they'll be copied into source distributions. Pip won't be able to
        # install the package without this.
        manifest_in = os.path.join(get_root(), "MANIFEST.in")
        simple_includes = set()
        try:
            for line in open(manifest_in, "r").readlines():
                if line.startswith("include "):
                    for include in line.split()[1:]:
                        simple_includes.add(include)
        except EnvironmentError:
            pass
        # That doesn't cover everything MANIFEST.in can do
        # (http://docs.python.org/2/distutils/sourcedist.html#commands), so
        # it might give some false negatives. Appending redundant 'include'
        # lines is safe, though.
        if "versioneer.py" not in simple_includes:
            print(" appending 'versioneer.py' to MANIFEST.in")
            f = open(manifest_in, "a")
            f.write("include versioneer.py\n")
            f.close()
        else:
            print(" 'versioneer.py' already in MANIFEST.in")
        if versionfile_source not in simple_includes:
            print(" appending versionfile_source ('%s') to MANIFEST.in" %
                  versionfile_source)
            f = open(manifest_in, "a")
            f.write("include %s\n" % versionfile_source)
            f.close()
        else:
            print(" versionfile_source already in MANIFEST.in")

        # Make VCS-specific changes. For git, this means creating/changing
        # .gitattributes to mark _version.py for export-time keyword
        # substitution.
        do_vcs_install(manifest_in, versionfile_source, ipy)

def get_cmdclass():
    cmds = {'version': cmd_version,
            'versioneer': cmd_update_files,
            'build': cmd_build,
            'sdist': cmd_sdist,
            }
    if 'cx_Freeze' in sys.modules:  # cx_freeze enabled?
        cmds['build_exe'] = cmd_build_exe
        del cmds['build']

    return cmds