get: implement --show-url to display only url/path to remote

dvc/command/get.py

@@ -10,7 +10,28 @@ logger = logging.getLogger(__name__)
 
 
 class CmdGet(CmdBaseNoRepo):
+    def _run_get_url(self):
+        from dvc.api import get_url
+
+        try:
+            url = get_url(
+                self.args.path, repo=self.args.url, rev=self.args.rev
+            )
+            logger.info("{} {}".format(self.args.path, url))
+        except DvcException:
+            logger.exception(
+                "failed to show url for '{}' from '{}'".format(
+                    self.args.path, self.args.url
+                )
+            )
+            return 1
+        return 0
+
     def run(self):
+
+        if self.args.show_url:
+            return self._run_get_url()
+
         from dvc.repo import Repo
 
         try:
@@ -55,4 +76,9 @@ def add_parser(subparsers, parent_parser):
     get_parser.add_argument(
         "--rev", nargs="?", help="Git revision (e.g. branch, tag, SHA)"
     )
+    get_parser.add_argument(
+        "--show-url",
+        action="store_true",
+        help="Returns path/url to the location in remote for specified path",
+    )
     get_parser.set_defaults(func=CmdGet)

tests/func/test_get.py

@@ -5,6 +5,7 @@ import pytest
 
 from dvc.cache import Cache
 from dvc.config import Config
+from dvc.main import main
 from dvc.repo.get import GetDVCFileError, PathMissingError
 from dvc.repo import Repo
 from dvc.system import System
@@ -184,3 +185,15 @@ def test_get_from_non_dvc_master(tmp_dir, erepo_dir, caplog):
 
     assert caplog.text == ""
     assert (tmp_dir / dst).read_text() == "some_contents"
+
+
+def test_get_url(tmp_dir, erepo_dir):
+    with erepo_dir.chdir():
+        erepo_dir.dvc_gen("foo", "foo")
+        assert main(["get", ".", "foo", "--show-url"]) == 0
+
+
+def test_get_url_not_existing(tmp_dir, erepo_dir):
+    with erepo_dir.chdir():
+        erepo_dir.dvc_gen("foo", "foo")
+        assert main(["get", ".", "food", "--show-url"]) == 1

tests/unit/command/test_get.py

@@ -14,3 +14,17 @@ def test_get(mocker):
     assert cmd.run() == 0
 
     m.assert_called_once_with("repo_url", path="src", out="out", rev="version")
+
+
+def test_get_url(mocker):
+    cli_args = parse_args(
+        ["get", "repo_url", "src", "--rev", "version", "--show-url"]
+    )
+    assert cli_args.func == CmdGet
+
+    cmd = cli_args.func(cli_args)
+    m = mocker.patch("dvc.api.get_url")
+
+    assert cmd.run() == 0
+
+    m.assert_called_once_with("src", repo="repo_url", rev="version")