fix interactive mode, use environment var to change location

ui/medashare/cli.py

@@ -774,11 +774,17 @@ class TagCache:
 			fp.write(_asn1coder.dumps(cache))
 
 def _get_paths(options):
-	identfname = os.path.expanduser('~/.medashare_identity.pasn1')
-	storefname = os.path.expanduser('~/.medashare_store.sqlite3')
-	cachefname = os.path.expanduser('~/.medashare_cache.pasn1')
+	fnames = (
+	    '.medashare_identity.pasn1',
+	    '.medashare_store.sqlite3',
+	    '.medashare_cache.pasn1' )
 
-	return identfname, storefname, cachefname
+	if 'MEDASHARE_PATH' in os.environ:
+		return ( os.path.expanduser(
+		    os.path.join(os.environ['MEDASHARE_PATH'], x)) for x in
+		    fnames )
+
+	return ( os.path.expanduser('~/' + x) for x in fnames )
 
 def init_datastructs(f):
 	@functools.wraps(f)
@@ -1040,8 +1046,6 @@ def checkforfile(objstr, curfile, ask=False):
 
 @init_datastructs
 def cmd_interactive(options, persona, objstr, cache):
-	cache = get_cache(options)
-
 	files = [ pathlib.Path(x) for x in options.files ]
 
 	autoskip = True
@@ -2053,6 +2057,23 @@ class _TestCases(unittest.TestCase):
 		for i in patches:
 			i.stop()
 
+	def test_get_paths(self):
+		# Test to make sure get paths works as expected.
+		with mock.patch('os.path.expanduser') as eu:
+			a, b, c = _get_paths(None)
+
+			eu.assert_any_call('~/.medashare_identity.pasn1')
+			eu.assert_any_call('~/.medashare_store.sqlite3')
+			eu.assert_any_call('~/.medashare_cache.pasn1')
+
+		pathpref = pathlib.Path('/somepath/somewhere')
+		with mock.patch.dict(os.environ, dict(MEDASHARE_PATH=str(pathpref))):
+			i, s, c = _get_paths(None)
+
+			self.assertEqual(i, str(pathpref / '.medashare_identity.pasn1'))
+			self.assertEqual(s, str(pathpref / '.medashare_store.sqlite3'))
+			self.assertEqual(c, str(pathpref / '.medashare_cache.pasn1'))
+
 	#@unittest.skip('temp')
 	def test_cmds(self):
 		cmds = sorted(self.fixtures.glob('cmd.*.json'))