make exp run --dry imply --temp

dvc/commands/experiments/run.py

@@ -26,7 +26,7 @@ class CmdExperimentsRun(CmdRepro):
 
 
 def add_parser(experiments_subparsers, parent_parser):
-    EXPERIMENTS_RUN_HELP = "Run or resume an experiment."
+    EXPERIMENTS_RUN_HELP = "Run an experiment."
     experiments_run_parser = experiments_subparsers.add_parser(
         "run",
         parents=[parent_parser],

dvc/repo/experiments/run.py

@@ -30,6 +30,9 @@ def run(  # noqa: C901, PLR0912
     Returns a dict mapping new experiment SHAs to the results
     of `repro` for that experiment.
     """
+    if kwargs.get("dry"):
+        tmp_dir = True
+
     if run_all:
         return repo.experiments.reproduce_celery(jobs=jobs)
 

tests/func/experiments/test_experiments.py

@@ -676,10 +676,12 @@ def test_experiment_unchanged(tmp_dir, scm, dvc, exp_stage):
     assert len(dvc.experiments.ls()[scm.get_rev()]) == 2
 
 
-def test_experiment_run_dry(tmp_dir, scm, dvc, exp_stage):
+def test_experiment_run_dry(tmp_dir, scm, dvc, exp_stage, mocker):
+    repro = mocker.spy(dvc.experiments, "reproduce_one")
     dvc.experiments.run(exp_stage.addressing, dry=True)
 
     assert len(dvc.experiments.ls()["master"]) == 0
+    assert repro.call_args.kwargs["tmp_dir"] is True
 
 
 def test_clean(tmp_dir, scm, dvc, mocker):