environment variable to show debug options (#9693)

* environment variable to show debug options

* lint

[pre-commit.ci] auto fixes from pre-commit.com hooks

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* Add message to debug opts

* spelling

* Add argument group and move cprofile-dump

line length

linelen

lint

* use DVC_DEBUG instead of DVC_SHOW_DEBUG_OPTIONS

* use -v instead of environ

* Update dvc/_debug.py

Co-authored-by: skshetry <[email protected]>

* fix

---------

Co-authored-by: skshetry <[email protected]>

dvc/_debug.py

@@ -198,33 +198,84 @@ def debugtools(args: Optional["Namespace"] = None, **kwargs):
 def add_debugging_flags(parser):
     from argparse import SUPPRESS
 
-    parser.add_argument("--cprofile", action="store_true", default=False, help=SUPPRESS)
-    parser.add_argument("--yappi", action="store_true", default=False, help=SUPPRESS)
+    # For detailed info see:
+    # https://github.com/iterative/dvc/wiki/Debugging,-Profiling-and-Benchmarking-DVC
+    args, _ = parser.parse_known_args()
+    verbose = args.verbose
+
+    def debug_help(msg):
+        if verbose:
+            return msg
+        return SUPPRESS
+
+    parser = parser.add_argument_group("debug options")
+
+    parser.add_argument(
+        "--cprofile",
+        action="store_true",
+        default=False,
+        help=debug_help("Generate cprofile data for tools like snakeviz / tuna"),
+    )
+    parser.add_argument(
+        "--cprofile-dump", help=debug_help("Location to dump cprofile file")
+    )
+    parser.add_argument(
+        "--yappi",
+        action="store_true",
+        default=False,
+        help=debug_help(
+            "Generate a callgrind file for use with tools like "
+            "kcachegrind / qcachegrind"
+        ),
+    )
     parser.add_argument(
         "--yappi-separate-threads",
         action="store_true",
         default=False,
-        help=SUPPRESS,
+        help=debug_help("Generate one callgrind file per thread"),
     )
     parser.add_argument(
-        "--viztracer", action="store_true", default=False, help=SUPPRESS
-    )
-    parser.add_argument("--viztracer-depth", type=int, help=SUPPRESS)
-    parser.add_argument(
-        "--viztracer-async", action="store_true", default=False, help=SUPPRESS
-    )
-    parser.add_argument("--cprofile-dump", help=SUPPRESS)
-    parser.add_argument("--pdb", action="store_true", default=False, help=SUPPRESS)
-    parser.add_argument(
-        "--instrument", action="store_true", default=False, help=SUPPRESS
+        "--viztracer",
+        action="store_true",
+        default=False,
+        help=debug_help("Generate a viztracer file for use with vizviewer"),
     )
     parser.add_argument(
-        "--instrument-open", action="store_true", default=False, help=SUPPRESS
+        "--viztracer-depth",
+        type=int,
+        help=debug_help("Set viztracer maximum stack depth"),
+    )
+    parser.add_argument(
+        "--viztracer-async",
+        action="store_true",
+        default=False,
+        help=debug_help("Treat async tasks as threads"),
+    )
+    parser.add_argument(
+        "--pdb",
+        action="store_true",
+        default=False,
+        help=debug_help("Drop into the pdb/ipdb debugger on any exception"),
+    )
+    parser.add_argument(
+        "--instrument",
+        action="store_true",
+        default=False,
+        help=debug_help("Use pyinstrument CLI profiler"),
+    )
+    parser.add_argument(
+        "--instrument-open",
+        action="store_true",
+        default=False,
+        help=debug_help("Use pyinstrument web profiler"),
     )
     parser.add_argument(
         "--show-stack",
         "--ss",
         action="store_true",
         default=False,
-        help=SUPPRESS,
+        help=debug_help(
+            r"Use Ctrl+T on macOS or Ctrl+\ on Linux to print the stack "
+            "frame currently executing. Unavailable on Windows."
+        ),
     )

dvc/cli/parser.py

@@ -137,7 +137,6 @@ def get_parent_parser():
     from dvc._debug import add_debugging_flags
 
     parent_parser = argparse.ArgumentParser(add_help=False)
-    add_debugging_flags(parent_parser)
     log_level_group = parent_parser.add_mutually_exclusive_group()
     log_level_group.add_argument(
         "-q", "--quiet", action="count", default=0, help="Be quiet."
@@ -145,6 +144,7 @@ def get_parent_parser():
     log_level_group.add_argument(
         "-v", "--verbose", action="count", default=0, help="Be verbose."
     )
+    add_debugging_flags(parent_parser)
 
     return parent_parser