key: remove COVERAGE_PROCESS_START during meta

Author: nedbat

Makefile

@@ -41,7 +41,7 @@ clean: debug_clean _clean_platform	## Remove artifacts of test execution, instal
 	@rm -f */.coverage */*/.coverage */*/*/.coverage */*/*/*/.coverage */*/*/*/*/.coverage */*/*/*/*/*/.coverage
 	@rm -f tests/covmain.zip tests/zipmods.zip tests/zip1.zip
 	@rm -rf doc/_build doc/_spell doc/sample_html_beta
-	@rm -rf tmp
+	@rm -rf tmp /tmp/foo.out
 	@rm -rf .*cache */.*cache */*/.*cache */*/*/.*cache .hypothesis
 	@rm -rf tests/actual
 	@-make -C tests/gold/html clean

coverage/control.py

@@ -584,6 +584,7 @@ def _init_for_start(self) -> None:
 
         self._core = Core(
             warn=self._warn,
+            debug=(self._debug if self._debug.should("core") else None),
             config=self.config,
             dynamic_contexts=(should_start_context is not None),
             metacov=self._metacov,

coverage/core.py

@@ -16,7 +16,7 @@
 from coverage.misc import isolate_module
 from coverage.pytracer import PyTracer
 from coverage.sysmon import SysMonitor
-from coverage.types import TFileDisposition, Tracer, TWarnFn
+from coverage.types import TDebugCtl, TFileDisposition, Tracer, TWarnFn
 
 os = isolate_module(os)
 
@@ -56,17 +56,18 @@ class Core:
 
     def __init__(
         self,
+        *,
         warn: TWarnFn,
+        debug: TDebugCtl | None,
         config: CoverageConfig,
         dynamic_contexts: bool,
         metacov: bool,
     ) -> None:
-        # print("core.py!!!")
-        # print(f"sys.path = {newline}{newline.join(sys.path)}")
-        # print(f"{CTRACER_FILE = }")
-        # import inspect
-        #
-        # print("\n".join("%30s : %s:%d" % (t[3], t[1], t[2]) for t in inspect.stack()[99:0:-1]))
+        def _debug(msg: str) -> None:
+            if debug:
+                debug.write(msg)
+
+        _debug("in core.py")
 
         # Check the conditions that preclude us from using sys.monitoring.
         reason_no_sysmon = ""
@@ -82,31 +83,34 @@ def __init__(
         core_name: str | None = None
         if config.timid:
             core_name = "pytrace"
-            # print("core.py: Using pytrace because timid=True")
+            _debug("core.py: Using pytrace because timid=True")
         elif core_name is None:
             # This could still leave core_name as None.
             core_name = config.core
-            # print(f"core.py: core from config is {core_name!r}")
+            _debug(f"core.py: core from config is {core_name!r}")
 
         if core_name == "sysmon" and reason_no_sysmon:
+            _debug(f"core.py: raising ConfigError because sysmon not usable: {reason_no_sysmon}")
             raise ConfigError(
                 f"Can't use core=sysmon: sys.monitoring {reason_no_sysmon}", skip_tests=True
             )
 
         if core_name is None:
             if env.SYSMON_DEFAULT and not reason_no_sysmon:
                 core_name = "sysmon"
-                # print("core.py: Using sysmon because SYSMON_DEFAULT is set")
+                _debug("core.py: Using sysmon because SYSMON_DEFAULT is set")
             else:
                 core_name = "ctrace"
-                # print("core.py: Defaulting to ctrace core")
+                _debug("core.py: Defaulting to ctrace core")
 
         if core_name == "ctrace":
             if not CTRACER_FILE:
                 if IMPORT_ERROR and env.SHIPPING_WHEELS:
                     warn(f"Couldn't import C tracer: {IMPORT_ERROR}", slug="no-ctracer", once=True)
                 core_name = "pytrace"
-                # print("core.py: Falling back to pytrace because C tracer not available")
+                _debug("core.py: Falling back to pytrace because C tracer not available")
+
+        _debug(f"core.py: Using core={core_name}")
 
         self.tracer_kwargs = {}
 

igor.py

@@ -207,7 +207,6 @@ def run_tests_with_coverage(core, *runner_args):
     cov._warn_unimported_source = False
     cov._warn_preimported_source = False
     cov._metacov = True
-    # print(f"igor start()")
     cov.start()
 
     try:
@@ -224,7 +223,10 @@ def run_tests_with_coverage(core, *runner_args):
                     covmods[name] = mod
                     del sys.modules[name]
         hidden = hide_extension(core)
-        # print("igor: re-importing coverage")
+
+        # Remove the reference to metacov.ini.
+        del os.environ["COVERAGE_PROCESS_START"]
+
         import coverage  # pylint: disable=reimported
 
         sys.modules.update(covmods)