Merge pull request #1120 from efiop/master

Misc enhancements

dvc/cli.py

@@ -805,4 +805,12 @@ def parse_args(argv=None):
                 pipeline_show_parser.error(msg)
         args.targets = ['Dvcfile']
 
+    if issubclass(args.func, CmdRun) \
+       and len(args.deps) == 0 \
+       and len(args.outs) == 0 \
+       and len(args.outs_no_cache) == 0 \
+       and len(args.command) == 0:
+        run_parser.error("Too few arguments. Specify at least one: "
+                         "'-d', '-o', '-O', 'command'.")
+
     return args

dvc/project.py

@@ -106,7 +106,6 @@ class Project(object):
 
     def _ignore(self):
         flist = [self.state.state_file,
-                 self.link_state.state_file,
                  self.lock.lock_file,
                  self.config.config_local_file,
                  self.updater.updater_file]

dvc/state.py

@@ -14,7 +14,6 @@ class StateDuplicateError(DvcException):
 
 class State(object):
     STATE_FILE = 'state'
-    STATE_LOCK_FILE = 'state.lock'
     STATE_TABLE = 'state'
     STATE_TABLE_LAYOUT = "inode TEXT PRIMARY KEY, " \
                          "mtime TEXT NOT NULL, " \
@@ -166,8 +165,6 @@ class State(object):
 
 
 class LinkState(State):
-    STATE_FILE = 'link.state'
-    STATE_LOCK_FILE = STATE_FILE + '.lock'
     STATE_TABLE = 'link'
     STATE_TABLE_LAYOUT = "path TEXT PRIMARY KEY, " \
                          "inode TEXT NOT NULL, " \