Pick up versioning using pkg_resources or pbr

Use pkg_resources to extract the version from PKG_INFO or fallback to
using pbr presumably if within a source checkout to determine the
correct version to report.

Change-Id: Id70cc4a1fc6e66114461d469cef65b196acec079

git_upstream/__init__.py

@@ -14,3 +14,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+
+import pkg_resources
+
+
+try:
+    # First, try to get our version out of PKG-INFO. If we're installed,
+    # this'll let us find our version without pulling in pbr. After all, if
+    # we're installed on a system, we're not in a Git-managed source tree, so
+    # pbr doesn't really buy us anything.
+    __version__ = __canonical_version__ = pkg_resources.get_provider(
+        pkg_resources.Requirement.parse('git-upstream')).version
+except pkg_resources.DistributionNotFound:
+    # No PKG-INFO? We're probably running from a checkout, then. Let pbr do
+    # its thing to figure out a version number.
+    import pbr.version
+    _version_info = pbr.version.VersionInfo('git-upstream')
+    __version__ = _version_info.release_string()
+    __canonical_version__ = _version_info.version_string()

git_upstream/main.py

@@ -25,7 +25,7 @@ import git
 import git_upstream.commands as commands
 from git_upstream.errors import GitUpstreamError
 import git_upstream.log as log
-import git_upstream.version
+from git_upstream import __version__
 
 import subcommand
 import argparse
@@ -45,7 +45,7 @@ def get_parser():
         epilog='See "%(prog)s help COMMAND" for help on a specific command.',
         add_help=False)
     parser.add_argument('--version', action='version',
-                        version='%(prog)s ' + git_upstream.version.version)
+                        version='%(prog)s ' + __version__)
     parser.add_argument('-h', '--help', action='help',
                         help='show this help message and exit')
     group = parser.add_mutually_exclusive_group()

git_upstream/version.py

@@ -1,87 +0,0 @@
-#
-# Copyright (c) 2011, 2012 OpenStack LLC.
-# Copyright (c) 2012, 2013, 2014 Hewlett-Packard Development Company, L.P.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import datetime
-import os
-import subprocess
-
-VERBOSE = os.environ.get('VERBOSE', False)
-
-
-class CommandException(Exception):
-    pass
-
-
-# following function is taken from git-review
-def run_command(cmd, status=False, env=None):
-    if not env:
-        env = {}
-    if VERBOSE:
-        print(datetime.datetime.now(), "Running:", cmd)
-    new_env = os.environ
-    new_env.update(env)
-    p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
-                         stderr=subprocess.STDOUT, env=new_env)
-    (out, nothing) = p.communicate()
-    if p.returncode:
-        raise CommandException
-    out = out.decode('utf-8')
-    if status:
-        return (p.returncode, out.strip())
-    return out.strip()
-
-
-def git_describe_version():
-    try:
-        v = run_command(['git', 'describe', '--tags', '--dirty'])
-    except CommandException:
-        raise
-
-    return v
-
-
-def git_upstream_version():
-    try:
-        from git_upstream import git_upstream_version
-    except ImportError:
-        raise
-    return git_upstream_version.version
-
-
-def write_version_file():
-    try:
-        v = git_describe_version()
-    except:
-        return
-    print __name__
-    with open(os.path.join(os.path.dirname(__file__),
-                           "git_upstream_version.py"), 'w') as f:
-        f.write("# Auto-generated file, do not edit by hand")
-        f.write("version = %s" % v)
-
-
-def get_version():
-    for vfunc in git_upstream_version, git_describe_version:
-        try:
-            return vfunc()
-        except:
-            pass
-
-    return 'unknown-version'
-
-
-version = get_version()