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version.py
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version.py
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# -*- coding: utf-8 -*-
# Authors: Douglas Creager <dcreager@dcreager.net> and Moritz Voss
# This file is placed into the public domain.
# Calculates the current version number. If possible, this is the
# output of “git describe”, modified to conform to the versioning
# scheme that setuptools uses. If “git describe” returns an error
# (most likely because we're in an unpacked copy of a release tarball,
# rather than in a git working copy), then we fall back on reading the
# contents of the RELEASE-VERSION file.
#
# To use this script, simply import it your setup.py file, and use the
# results of get_git_version() as your package version:
#
# from version import *
#
# setup(
# version=get_git_version(),
# .
# .
# .
# )
#
# This will automatically create and update a RELEASE-VERSION file that can
# be bundled with your distributable. If one exists, it will read that.
# Note that the RELEASE-VERSION file should *not* be checked into git;
# please add it to your top-level .gitignore file.
__all__ = "get_git_version"
import pygit2
def git_describe(repository, commit):
"""
Python equivalent to the git describe --tags command.
"""
import re
regex = re.compile('^refs/tags')
tags = filter(lambda r: regex.match(r), repository.listall_references())
if tags:
tag_lookup = {}
for tag in tags:
tag_lookup[repository.lookup_reference(tag).resolve().get_object().hex] = tag
distance = 0
for parent in repository.walk(commit, pygit2.GIT_SORT_TIME):
if parent.hex in tag_lookup:
if distance == 0:
return tags[parent.hex]
return '%s-%d-g%s' % (tag_lookup[parent.hex][10:], distance, commit.hex[:7])
distance += 1
return 'g' + commit.hex[:7]
def read_release_version():
try:
f = open("RELEASE-VERSION", "r")
try:
version = f.readlines()[0]
return version.strip()
finally:
f.close()
except IOError:
return None
def write_release_version(version):
with open("RELEASE-VERSION", "w") as f:
f.write("%s\n" % version)
def msi_version(git_version):
import re
sanitized = [fragment for fragment in re.findall(r"[\w']+", git_version) if fragment.isdigit()][:3]
return ".".join(sanitized) or "0.0.0"
def get_git_version():
# Read in the version that's currently in RELEASE-VERSION.
release_version = read_release_version()
# First try to get the current version using “git describe”.
repo = pygit2.Repository(".")
version = git_describe(repo, repo.head.target)
# If that doesn't work, fall back on the value that's in
# RELEASE-VERSION.
if version is None:
version = release_version
# If we still don't have anything, that's an error.
if version is None:
raise ValueError("Cannot find the version number!")
# If the current version is different from what's in the
# RELEASE-VERSION file, update the file to be current.
if version != release_version:
write_release_version(version)
# Finally, return the current version.
return version
if __name__ == "__main__":
print get_git_version()