dvc: introduce 'dvc cache fetch'

Fixes #521

Signed-off-by: Ruslan Kuprieiev <[email protected]>

dvc/cli.py

@@ -10,7 +10,7 @@ from dvc.command.init import CmdInit
 from dvc.command.remove import CmdRemove
 from dvc.command.run import CmdRun
 from dvc.command.repro import CmdRepro
-from dvc.command.data_sync import CmdDataPush, CmdDataPull, CmdDataStatus
+from dvc.command.data_sync import CmdDataPush, CmdDataPull, CmdDataStatus, CmdDataFetch
 from dvc.command.gc import CmdGC
 from dvc.command.add import CmdAdd
 from dvc.command.config import CmdConfig
@@ -161,6 +161,13 @@ def parse_args(argv=None):
                         help='Push data files to the cloud')
     push_parser.set_defaults(func=CmdDataPush)
 
+    #Fetch
+    fetch_parser = cache_subparsers.add_parser(
+                        'fetch',
+                        parents=[parent_cache_parser],
+                        help='Fetch data files from the cloud')
+    fetch_parser.set_defaults(func=CmdDataFetch)
+
     # Status
     status_parser = cache_subparsers.add_parser(
                         'status',

dvc/command/data_sync.py

@@ -40,6 +40,16 @@ class CmdDataPush(CmdDataBase):
         return 0
 
 
+class CmdDataFetch(CmdDataBase):
+    def do_run(self, target=None):
+        try:
+            self.project.fetch(target=target, jobs=self.args.jobs)
+        except DvcException as exc:
+            self.project.logger.error('Failed to fetch data from the cloud', exc)
+            return 1
+        return 0
+
+
 class CmdDataStatus(CmdDataBase):
     def _show(self, status):
         for s in status:

dvc/project.py

@@ -201,8 +201,11 @@ class Project(object):
     def push(self, target=None, jobs=1):
         return self.cloud.push(self._used_cache(target), jobs)
 
+    def fetch(self, target=None, jobs=1):
+        return self.cloud.pull(self._used_cache(target), jobs)
+
     def pull(self, target=None, jobs=1):
-        ret = self.cloud.pull(self._used_cache(target), jobs)
+        ret = self.fetch(target, jobs)
         self.checkout()
         return ret