Experimental: Use setuptools-scm

Closes: #58

.gitignore

@@ -1,3 +1,4 @@
+sshuttle/version.py
 *.pyc
 *~
 *.8

setup.py

@@ -19,12 +19,20 @@
 
 from setuptools import setup, find_packages
 
-with open('VERSION.txt', 'r') as f:
-    version = f.readline().strip()
+
+def version_scheme(version):
+    from setuptools_scm.version import guess_next_dev_version
+    version = guess_next_dev_version(version)
+    return version.lstrip("v")
 
 setup(
     name="sshuttle",
-    version=version,
+    use_scm_version={
+        'write_to': "sshuttle/version.py",
+        'version_scheme': version_scheme,
+    },
+    setup_requires=['setuptools_scm'],
+    # version=version,
     url='https://github.com/sshuttle/sshuttle',
     author='Brian May',
     author_email='brian@linuxpenguins.xyz',

sshuttle/__main__.py

@@ -126,6 +126,7 @@ r,remote=  ssh hostname (and optional username) of remote sshuttle server
 x,exclude= exclude this subnet (can be used more than once)
 X,exclude-from=  exclude the subnets in a file (whitespace separated)
 v,verbose  increase debug message verbosity
+V,version  print the sshuttle version number and exit
 e,ssh-cmd= the command to use to connect to the remote [ssh]
 seed-hosts= with -H, use these hostnames for initial scan (comma-separated)
 no-latency-control  sacrifice latency to improve bandwidth benchmarks
@@ -142,6 +143,10 @@ hostwatch  (internal use only)
 o = options.Options(optspec)
 (opt, flags, extra) = o.parse(sys.argv[1:])
 
+if opt.version:
+    from sshuttle.version import version
+    print(version)
+    exit(0)
 if opt.daemon:
     opt.syslog = 1
 if opt.wrap: