Attempt at making versions only exist in git

Signed-off-by: Ole Herman Schumacher Elgesem <ole@northern.tech>

Author: olehermanse

cf_remote/version.py

@@ -1,2 +1,2 @@
 def string():
-    return "0.1.5"
+    return "UNKOWN_VERSION"

setup.py

@@ -1,12 +1,25 @@
 import setuptools
-from cf_remote import version
+import subprocess
+
+cf_remote_version = subprocess.run(['git', 'describe', '--tags'], stdout=subprocess.PIPE).stdout.decode("utf-8").strip()
+assert "." in cf_remote_version
+
+with open("cf_remote/version.py", "r", encoding="utf-8") as fh:
+    version_module = fh.read()
+
+assert "UNKOWN_VERSION" in version_module
+
+version_module = version_module.replace("UNKOWN_VERSION", cf_remote_version)
+
+with open("cf_remote/version.py", "w", encoding="utf-8") as fh:
+    fh.write(version_module)
 
 with open("README.md", "r", encoding="utf-8") as fh:
     long_description = fh.read()
 
 setuptools.setup(
     name="cf-remote",
-    version=f"{version.string()}",
+    version=cf_remote_version,
     author="Northern.tech, Inc.",
     author_email="contact@northern.tech",
     description="Tooling to deploy CFEngine (and much more)",