exp: add exec-run plumbing command to run exp from ExecutorInfo

dvc/command/base.py

@@ -57,3 +57,13 @@ class CmdBaseNoRepo(CmdBase):
 
     def do_run(self):
         return self.run()
+
+
+def fix_plumbing_subparsers(subparsers):
+    # metavar needs to be explicitly set in order to hide plumbing subcommands
+    # from the 'positional arguments' choices list
+    # see: https://bugs.python.org/issue22848
+    cmds = [
+        cmd for cmd, parser in subparsers.choices.items() if parser.add_help
+    ]
+    subparsers.metavar = "{{{}}}".format(",".join(cmds))

dvc/command/experiments/__init__.py

@@ -1,10 +1,15 @@
 import argparse
 
-from dvc.command.base import append_doc_link, fix_subparsers
+from dvc.command.base import (
+    append_doc_link,
+    fix_plumbing_subparsers,
+    fix_subparsers,
+)
 from dvc.command.experiments import (
     apply,
     branch,
     diff,
+    exec_run,
     gc,
     init,
     ls,
@@ -19,6 +24,7 @@ SUB_COMMANDS = [
     apply,
     branch,
     diff,
+    exec_run,
     gc,
     init,
     ls,
@@ -51,3 +57,4 @@ def add_parser(subparsers, parent_parser):
     fix_subparsers(experiments_subparsers)
     for cmd in SUB_COMMANDS:
         cmd.add_parser(experiments_subparsers, parent_parser)
+    fix_plumbing_subparsers(experiments_subparsers)

dvc/command/experiments/exec_run.py

@@ -0,0 +1,41 @@
+import logging
+
+from dvc.command.base import CmdBaseNoRepo
+
+logger = logging.getLogger(__name__)
+
+
+class CmdExecutorRun(CmdBaseNoRepo):
+    """Run an experiment executor."""
+
+    def run(self):
+        from dvc.repo.experiments.executor.base import (
+            BaseExecutor,
+            ExecutorInfo,
+        )
+        from dvc.utils.serialize import load_json
+
+        info = ExecutorInfo.from_dict(load_json(self.args.infofile))
+        BaseExecutor.reproduce(
+            info=info,
+            rev="",
+            queue=None,
+            log_level=logger.getEffectiveLevel(),
+        )
+        return 0
+
+
+def add_parser(experiments_subparsers, parent_parser):
+    EXEC_RUN_HELP = "Run an experiment executor."
+    exec_run_parser = experiments_subparsers.add_parser(
+        "exec-run",
+        parents=[parent_parser],
+        description=EXEC_RUN_HELP,
+        add_help=False,
+    )
+    exec_run_parser.add_argument(
+        "--infofile",
+        help="Path to executor info file",
+        default=None,
+    )
+    exec_run_parser.set_defaults(func=CmdExecutorRun)