run: use multistage dvcfiles by default

dvc/command/run.py

@@ -50,6 +50,7 @@ def run(self):
                 outs_persist_no_cache=self.args.outs_persist_no_cache,
                 always_changed=self.args.always_changed,
                 name=self.args.name,
+                single_stage=self.args.single_stage,
             )
         except DvcException:
             logger.exception("")
@@ -96,7 +97,9 @@ def add_parser(subparsers, parent_parser):
         help="Declare dependencies for reproducible cmd.",
         metavar="<path>",
     )
-    run_parser.add_argument("-n", "--name", help=argparse.SUPPRESS)
+    run_parser.add_argument(
+        "-n", "--name", help="Stage name.",
+    )
     run_parser.add_argument(
         "-o",
         "--outs",
@@ -198,6 +201,12 @@ def add_parser(subparsers, parent_parser):
         default=False,
         help="Always consider this DVC-file as changed.",
     )
+    run_parser.add_argument(
+        "--single-stage",
+        action="store_true",
+        default=False,
+        help=argparse.SUPPRESS,
+    )
     run_parser.add_argument(
         "command", nargs=argparse.REMAINDER, help="Command to execute."
     )

dvc/repo/run.py

@@ -2,6 +2,7 @@
 
 from . import locked
 from .scm_context import scm_context
+from dvc.exceptions import InvalidArgumentError
 from dvc.stage.exceptions import DuplicateStageName, InvalidStageName
 
 from funcy import first, concat
@@ -36,14 +37,23 @@ def _get_file_path(kwargs):
 
 @locked
 @scm_context
-def run(self, fname=None, no_exec=False, **kwargs):
+def run(self, fname=None, no_exec=False, single_stage=False, **kwargs):
     from dvc.stage import PipelineStage, Stage, create_stage
     from dvc.dvcfile import Dvcfile, PIPELINE_FILE
 
     stage_cls = PipelineStage
     path = PIPELINE_FILE
     stage_name = kwargs.get("name")
-    if not stage_name:
+
+    if stage_name and single_stage:
+        raise InvalidArgumentError(
+            "`-n|--name` is incompatible with `--single-stage`"
+        )
+
+    if not stage_name and not single_stage:
+        raise InvalidArgumentError("`-n|--name` is required")
+
+    if single_stage:
         kwargs.pop("name", None)
         stage_cls = Stage
         path = fname or _get_file_path(kwargs)

tests/func/test_add.py

@@ -264,7 +264,7 @@ def test_should_update_state_entry_for_file_after_add(mocker, dvc, tmp_dir):
     assert ret == 0
     assert file_md5_counter.mock.call_count == 1
 
-    ret = main(["run", "-d", "foo", "echo foo"])
+    ret = main(["run", "--single-stage", "-d", "foo", "echo foo"])
     assert ret == 0
     assert file_md5_counter.mock.call_count == 1
 
@@ -297,7 +297,9 @@ def test_should_update_state_entry_for_directory_after_add(
     assert file_md5_counter.mock.call_count == 3
 
     ls = "dir" if os.name == "nt" else "ls"
-    ret = main(["run", "-d", "data", "{} {}".format(ls, "data")])
+    ret = main(
+        ["run", "--single-stage", "-d", "data", "{} {}".format(ls, "data")]
+    )
     assert ret == 0
     assert file_md5_counter.mock.call_count == 3
 

tests/func/test_api.py

@@ -129,6 +129,7 @@ def test_open_not_cached(dvc):
         metric_file, metric_content
     )
     dvc.run(
+        single_stage=True,
         metrics_no_cache=[metric_file],
         cmd=('python -c "{}"'.format(metric_code)),
     )

tests/func/test_checkout.py

@@ -256,6 +256,7 @@ def test(self):
         self.commit_data_file(fname1)
         self.commit_data_file(fname2)
         self.dvc.run(
+            single_stage=True,
             cmd="python {} {} {}".format(self.CODE, self.FOO, fname3),
             deps=[self.CODE, self.FOO],
             outs_no_cache=[fname3],
@@ -341,7 +342,10 @@ def test(self):
 
         self.dvc.add(self.FOO)
         stage = self.dvc.run(
-            cmd=cmd, deps=[self.FOO, self.CODE], outs_no_cache=["out"]
+            cmd=cmd,
+            deps=[self.FOO, self.CODE],
+            outs_no_cache=["out"],
+            single_stage=True,
         )
         self.assertTrue(stage is not None)
 
@@ -480,7 +484,9 @@ def test(self):
 
 def test_checkout_no_checksum(tmp_dir, dvc):
     tmp_dir.gen("file", "file content")
-    stage = dvc.run(outs=["file"], no_exec=True, cmd="somecmd")
+    stage = dvc.run(
+        outs=["file"], no_exec=True, cmd="somecmd", single_stage=True
+    )
 
     with pytest.raises(CheckoutError):
         dvc.checkout([stage.path], force=True)
@@ -706,7 +712,11 @@ def test_checkout_with_relink_existing(tmp_dir, dvc, link):
 def test_checkout_with_deps(tmp_dir, dvc):
     tmp_dir.dvc_gen({"foo": "foo"})
     dvc.run(
-        fname="copy_file.dvc", cmd="echo foo > bar", outs=["bar"], deps=["foo"]
+        fname="copy_file.dvc",
+        cmd="echo foo > bar",
+        outs=["bar"],
+        deps=["foo"],
+        single_stage=True,
     )
 
     (tmp_dir / "bar").unlink()

tests/func/test_commit.py

@@ -38,7 +38,7 @@ def test_commit_force(tmp_dir, dvc):
     assert dvc.status([stage.path]) == {}
 
 
-@pytest.mark.parametrize("run_kw", [{}, {"name": "copy"}])
+@pytest.mark.parametrize("run_kw", [{"single_stage": True}, {"name": "copy"}])
 def test_commit_with_deps(tmp_dir, dvc, run_copy, run_kw):
     tmp_dir.gen("foo", "foo")
     (foo_stage,) = dvc.add("foo", no_commit=True)

tests/func/test_data_cloud.py

@@ -520,7 +520,9 @@ def _test(self):
         url = Local.get_url()
         self.main(["remote", "add", "-d", TEST_REMOTE, url])
 
-        stage = self.dvc.run(outs=["bar"], cmd="echo bar > bar")
+        stage = self.dvc.run(
+            outs=["bar"], cmd="echo bar > bar", single_stage=True
+        )
         self.main(["push"])
 
         stage_file_path = stage.relpath
@@ -630,7 +632,7 @@ def test_checksum_recalculation(mocker, dvc, tmp_dir):
     assert ret == 0
     ret = main(["push"])
     assert ret == 0
-    ret = main(["run", "-d", "foo", "echo foo"])
+    ret = main(["run", "--single-stage", "-d", "foo", "echo foo"])
     assert ret == 0
     assert test_get_file_checksum.mock.call_count == 1
 
@@ -783,7 +785,7 @@ def recurse_list_dir(d):
 
 def test_dvc_pull_pipeline_stages(tmp_dir, dvc, local_remote, run_copy):
     (stage0,) = tmp_dir.dvc_gen("foo", "foo")
-    stage1 = run_copy("foo", "bar")
+    stage1 = run_copy("foo", "bar", single_stage=True)
     stage2 = run_copy("bar", "foobar", name="copy-bar-foobar")
     outs = ["foo", "bar", "foobar"]
 
@@ -813,7 +815,7 @@ def test_dvc_pull_pipeline_stages(tmp_dir, dvc, local_remote, run_copy):
 
 def test_pipeline_file_target_ops(tmp_dir, dvc, local_remote, run_copy):
     tmp_dir.dvc_gen("foo", "foo")
-    run_copy("foo", "bar")
+    run_copy("foo", "bar", single_stage=True)
 
     tmp_dir.dvc_gen("lorem", "lorem")
     run_copy("lorem", "lorem2", name="copy-lorem-lorem2")

tests/func/test_dvcfile.py

@@ -50,7 +50,11 @@ def test_run_load_one_for_multistage_non_existing_stage_name(tmp_dir, dvc):
 def test_run_load_one_on_single_stage(tmp_dir, dvc):
     tmp_dir.gen("foo", "foo")
     stage = dvc.run(
-        cmd="cp foo foo2", deps=["foo"], metrics=["foo2"], always_changed=True,
+        cmd="cp foo foo2",
+        deps=["foo"],
+        metrics=["foo2"],
+        always_changed=True,
+        single_stage=True,
     )
     assert Dvcfile(dvc, stage.path).stages.get("random-name")
     assert Dvcfile(dvc, stage.path).stage
@@ -97,7 +101,11 @@ def test_load_all_multistage(tmp_dir, dvc):
 def test_load_all_singlestage(tmp_dir, dvc):
     tmp_dir.gen("foo", "foo")
     stage1 = dvc.run(
-        cmd="cp foo foo2", deps=["foo"], metrics=["foo2"], always_changed=True,
+        cmd="cp foo foo2",
+        deps=["foo"],
+        metrics=["foo2"],
+        always_changed=True,
+        single_stage=True,
     )
     stages = Dvcfile(dvc, "foo2.dvc").stages.values()
     assert len(stages) == 1
@@ -107,7 +115,11 @@ def test_load_all_singlestage(tmp_dir, dvc):
 def test_load_singlestage(tmp_dir, dvc):
     tmp_dir.gen("foo", "foo")
     stage1 = dvc.run(
-        cmd="cp foo foo2", deps=["foo"], metrics=["foo2"], always_changed=True,
+        cmd="cp foo foo2",
+        deps=["foo"],
+        metrics=["foo2"],
+        always_changed=True,
+        single_stage=True,
     )
     assert Dvcfile(dvc, "foo2.dvc").stage == stage1
 
@@ -144,7 +156,11 @@ def test_stage_collection(tmp_dir, dvc):
         always_changed=True,
     )
     stage3 = dvc.run(
-        cmd="cp bar bar2", deps=["bar"], metrics=["bar2"], always_changed=True,
+        cmd="cp bar bar2",
+        deps=["bar"],
+        metrics=["bar2"],
+        always_changed=True,
+        single_stage=True,
     )
     assert {s for s in dvc.stages} == {stage1, stage3, stage2}
 
@@ -174,7 +190,7 @@ def test_stage_filter(tmp_dir, dvc, run_copy):
 
 def test_stage_filter_in_singlestage_file(tmp_dir, dvc, run_copy):
     tmp_dir.gen("foo", "foo")
-    stage = run_copy("foo", "bar")
+    stage = run_copy("foo", "bar", single_stage=True)
     dvcfile = Dvcfile(dvc, stage.path)
     assert set(dvcfile.stages.filter(None).values()) == {stage}
     assert dvcfile.stages.filter(None).get(None) == stage

tests/func/test_pipeline.py

@@ -103,10 +103,23 @@ def test_disconnected_stage(tmp_dir, dvc):
     tmp_dir.dvc_gen({"base": "base"})
 
     dvc.add("base")
-    dvc.run(deps=["base"], outs=["derived1"], cmd="echo derived1 > derived1")
-    dvc.run(deps=["base"], outs=["derived2"], cmd="echo derived2 > derived2")
+    dvc.run(
+        deps=["base"],
+        outs=["derived1"],
+        cmd="echo derived1 > derived1",
+        single_stage=True,
+    )
+    dvc.run(
+        deps=["base"],
+        outs=["derived2"],
+        cmd="echo derived2 > derived2",
+        single_stage=True,
+    )
     final_stage = dvc.run(
-        deps=["derived1"], outs=["final"], cmd="echo final > final"
+        deps=["derived1"],
+        outs=["final"],
+        cmd="echo final > final",
+        single_stage=True,
     )
 
     command = CmdPipelineShow([])
@@ -134,7 +147,7 @@ def test_print_locked_stages(tmp_dir, dvc, caplog):
 
 def test_dot_outs(tmp_dir, dvc, run_copy):
     tmp_dir.gen("foo", "foo content")
-    run_copy("foo", "file")
+    run_copy("foo", "file", single_stage=True)
     assert main(["pipeline", "show", "--dot", "file.dvc", "--outs"]) == 0
 
 
@@ -208,8 +221,10 @@ def test_no_stages(self):
 
     def one_pipeline(self):
         self.dvc.add("foo")
-        self.dvc.run(deps=["foo"], outs=["bar"], cmd="")
-        self.dvc.run(deps=["bar"], outs=["baz"], cmd="echo baz > baz")
+        self.dvc.run(deps=["foo"], outs=["bar"], cmd="", single_stage=True)
+        self.dvc.run(
+            deps=["bar"], outs=["baz"], cmd="echo baz > baz", single_stage=True
+        )
         pipelines = self.dvc.pipelines
 
         self.assertEqual(len(pipelines), 1)
@@ -218,8 +233,10 @@ def one_pipeline(self):
 
     def two_pipelines(self):
         self.dvc.add("foo")
-        self.dvc.run(deps=["foo"], outs=["bar"], cmd="")
-        self.dvc.run(deps=["bar"], outs=["baz"], cmd="echo baz > baz")
+        self.dvc.run(deps=["foo"], outs=["bar"], cmd="", single_stage=True)
+        self.dvc.run(
+            deps=["bar"], outs=["baz"], cmd="echo baz > baz", single_stage=True
+        )
 
         self.dvc.add("code.py")
 
@@ -248,11 +265,13 @@ def test_split_pipeline(tmp_dir, scm, dvc):
         deps=["git_dep1", "data"],
         outs=["data_train", "data_valid"],
         cmd="echo train >> data_train && echo valid >> data_valid",
+        single_stage=True,
     )
     stage = dvc.run(
         deps=["git_dep2", "data_train", "data_valid"],
         outs=["result"],
         cmd="echo result >> result",
+        single_stage=True,
     )
 
     command = CmdPipelineShow([])
@@ -271,7 +290,7 @@ def test_split_pipeline(tmp_dir, scm, dvc):
 def test_pipeline_list_show_multistage(tmp_dir, dvc, run_copy, caplog):
     tmp_dir.gen("foo", "foo")
     run_copy("foo", "bar", name="copy-foo-bar")
-    run_copy("bar", "foobar")
+    run_copy("bar", "foobar", single_stage=True)
     command = CmdPipelineShow([])
 
     caplog.clear()
@@ -299,7 +318,7 @@ def test_pipeline_list_show_multistage(tmp_dir, dvc, run_copy, caplog):
 def test_pipeline_ascii_multistage(tmp_dir, dvc, run_copy):
     tmp_dir.gen("foo", "foo")
     run_copy("foo", "bar", name="copy-foo-bar")
-    run_copy("bar", "foobar")
+    run_copy("bar", "foobar", single_stage=True)
     command = CmdPipelineShow([])
     nodes, edges, is_tree = command._build_graph("foobar.dvc")
     assert set(nodes) == {"dvc.yaml:copy-foo-bar", "foobar.dvc"}