Print only custom env vars in the test log for each test

We still print the inherited env at the top of the test log because it
is useful when inspecting test results from a CI.

Fixes https://github.com/mesonbuild/meson/issues/3924

1 files changed, 9 insertions, 3 deletions

diff --git a/mesonbuild/mtest.py b/mesonbuild/mtest.py
index 855154f..2f2daad 100644
--- a/mesonbuild/mtest.py
+++ b/mesonbuild/mtest.py
@@ -20,7 +20,7 @@ import pickle
 from mesonbuild import build
 from mesonbuild import environment
 from mesonbuild.dependencies import ExternalProgram
-from mesonbuild import mesonlib
+from mesonbuild.mesonlib import MesonException
 from mesonbuild import mlog
 
 import time, datetime, multiprocessing, json
@@ -130,8 +130,11 @@ def returncode_to_status(retcode):
         signame = 'SIGinvalid'
     return '(exit status %d or signal %d %s)' % (retcode, signum, signame)
 
+def env_tuple_to_str(env):
+    return ''.join(["%s='%s' " % (k, v) for k, v in env])
 
-class TestException(mesonlib.MesonException):
+
+class TestException(MesonException):
     pass
 
 
@@ -162,7 +165,8 @@ class TestRun:
         if self.cmd is None:
             res += 'NONE\n'
         else:
-            res += '%s%s\n' % (''.join(["%s='%s' " % (k, v) for k, v in self.env.items()]), ' ' .join(self.cmd))
+            test_only_env = set(self.env.items()) - set(os.environ.items())
+            res += '{}{}\n'.format(env_tuple_to_str(test_only_env), ' '.join(self.cmd))
         if self.stdo:
             res += '--- stdout ---\n'
             res += self.stdo
@@ -608,6 +612,8 @@ TIMEOUT: %4d
 
         self.logfile.write('Log of Meson test suite run on %s\n\n'
                            % datetime.datetime.now().isoformat())
+        inherit_env = env_tuple_to_str(os.environ.items())
+        self.logfile.write('Inherited environment: {}\n\n'.format(inherit_env))
 
     @staticmethod
     def get_wrapper(options):