#465 Use minimal version from git or from default

 * do not use setuptools_scm
 * collect git describe and fallback to default version
 * get version as installed in scancode or fallback to default too.

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

etc/conf/base.txt

@@ -5,7 +5,6 @@ wheel
 pip
 wincertstore
 six
-setuptools-scm
 
 # Self
 -e .

setup.py

@@ -16,6 +16,59 @@
 from setuptools import setup
 
 
+version = '2.0.0rc3'
+
+
+def get_version(default=version, template='{tag}.{distance}+{commit}{dirty}'):
+    """
+    Return a version collected from git if possible or fall back to an hard-coded
+    version otherwise.
+    """
+    try:
+        tag, distance, commit, dirty = get_git_version()
+        if not distance and not dirty:
+            # we are from a clean Git tag: use tag
+            return tag
+
+        distance = 'dev{}'.format(distance)
+        if dirty:
+            time_stamp = get_time_stamp()
+            dirty = '.dirty.' + get_time_stamp()
+        else:
+            dirty = ''
+
+        return template.format(**locals())
+    except:
+        # no git data: use default version
+        return default
+
+
+def get_time_stamp():
+    """
+    Return a numeric UTC time stamp without microseconds.
+    """
+    from datetime import datetime
+    return (datetime.isoformat(datetime.utcnow()).split('.')[0]
+            .replace('T', '').replace(':', '').replace('-', ''))
+
+
+def get_git_version():
+    """
+    Return version parts from Git or raise an exception.
+    """
+    from subprocess import check_output, STDOUT
+    # this may fail with exceptions
+    cmd = 'git', 'describe', '--tags', '--long', '--dirty',
+    version = check_output(cmd, stderr=STDOUT).strip()
+    dirty = version.endswith('-dirty')
+    tag, distance, commit = version.split('-')[:3]
+    # lower tag and strip V prefix in tags
+    tag = tag.lower().lstrip('v ').strip()
+    # strip leading g from git describe commit
+    commit = commit.lstrip('g').strip()
+    return tag, int(distance), commit, dirty
+
+
 def read(*names, **kwargs):
     return io.open(
         join(dirname(__file__), *names),
@@ -28,11 +81,10 @@ def read(*names, **kwargs):
     re.sub(':obj:`~?(.*?)`', r'``\1``', read('CHANGELOG.rst'))
 )
 
+
 setup(
     name='scancode-toolkit',
-    version='2.0.0rc3',
-    use_scm_version=True,
-    setup_requires=['setuptools_scm'],
+    version=get_version(),
     license='Apache-2.0 with ScanCode acknowledgment and CC0-1.0 and others',
     description='ScanCode is a tool to scan code for license, copyright and other interesting facts.',
     long_description=long_description,

src/scancode/__init__.py

@@ -45,11 +45,9 @@
     fileutils.create_dir(scans_cache_dir)
 
 
-__version__ = '2.0.0rc3'
-
+from pkg_resources import get_distribution, DistributionNotFound
 try:
-    from setuptools_scm import get_version
-    __version__ = get_version(root=root_dir, relative_to=__file__)
-except:
-    pass
-
+    __version__ = get_distribution('scancode-toolkit').version
+except DistributionNotFound:
+    # package is not installed ??
+    __version__ = '2.0.0rc3'