Merge pull request #782 from efiop/master

dvc: introduce `dvc root` command

dvc/cli.py

@@ -20,6 +20,7 @@ from dvc.command.checkout import CmdCheckout
 from dvc.command.remote import CmdRemoteAdd, CmdRemoteRemove, CmdRemoteModify, CmdRemoteList
 from dvc.command.metrics import CmdMetricsShow, CmdMetricsAdd, CmdMetricsRemove
 from dvc.command.install import CmdInstall
+from dvc.command.root import CmdRoot
 from dvc.stage import Stage
 from dvc import VERSION
 
@@ -451,6 +452,13 @@ def parse_args(argv=None):
                         help='Install dvc hooks into the repository')
     install_parser.set_defaults(func=CmdInstall)
 
+    # Root
+    root_parser = subparsers.add_parser(
+                        'root',
+                        parents=[parent_parser],
+                        help='Relative path to project\'s directory')
+    root_parser.set_defaults(func=CmdRoot)
+
     args = parser.parse_args(argv)
 
     return args

dvc/command/root.py

@@ -0,0 +1,9 @@
+import os
+
+from dvc.command.common.base import CmdBase
+
+
+class CmdRoot(CmdBase):
+    def run(self):
+        self.project.logger.info(os.path.relpath(self.project.root_dir))
+        return 0