-v shows subprocess output

by setting only the subprocess log level to debug

require -vv to enable full debug output

Author: minrk

news/9447.feature.rst

@@ -0,0 +1 @@
+Require ``-vv`` for full debug-level output, ``-v`` now only enables showing subprocess output, e.g. of ``setup.py install``.

src/pip/_internal/utils/logging.py

@@ -246,7 +246,7 @@ def setup_logging(verbosity, no_color, user_log_file):
     """
 
     # Determine the level to be logging at.
-    if verbosity >= 1:
+    if verbosity >= 2:
         level = "DEBUG"
     elif verbosity == -1:
         level = "WARNING"
@@ -256,6 +256,15 @@ def setup_logging(verbosity, no_color, user_log_file):
         level = "CRITICAL"
     else:
         level = "INFO"
+    
+    if verbosity == 1:
+        # verbosity 1 means only subprocess logging is debug-level
+        # disabling capture of subprocess output
+        subprocess_level = "DEBUG"
+        subprocess_logger.setLevel(subprocess_level)
+    else:
+        subprocess_level = level
+
 
     level_number = getattr(logging, level)
 
@@ -334,7 +343,7 @@ def setup_logging(verbosity, no_color, user_log_file):
             # A handler responsible for logging to the console messages
             # from the "subprocessor" logger.
             "console_subprocess": {
-                "level": level,
+                "level": subprocess_level,
                 "class": handler_classes["stream"],
                 "no_color": no_color,
                 "stream": log_streams["stderr"],