[travis-ci] debugging ci failures on travis

.travis.yml

@@ -42,10 +42,15 @@ jobs:
       os: windows
       language: shell
       before_install:
+        # http://woshub.com/updating-trusted-root-certificates-in-windows-10
+        - certutil -generateSSTFromWU roots.sst
+        - powershell -Command 'Get-ChildItem -Path roots.sst | Import-Certificate -CertStoreLocation Cert:\LocalMachine\Root'
+        - rm -f roots.sst
         - choco upgrade python3 -y --version 3.12.8 --limit-output --params "/InstallDir:C:\\Python312"
       env:
         - PYTHON=C:\\Python312\\python
-        - CIBW_ENABLE=all
+        # a build using CIBW_ENABLE=all does not fit into Travis' time limit,
+        # so only the defaults are tested
 
     - name: Linux | s390x | Python 3.12
       python: 3.12

cibuildwheel/platforms/windows.py

@@ -1,3 +1,4 @@
+import json
 import os
 import platform as platform_module
 import shutil
@@ -350,28 +351,22 @@ def setup_python(
             text=True,
         ).strip()
         log.notice(f"Discovering Visual Studio for GraalPy at {vcpath}")
-        env.update(
-            dict(
-                [
-                    envvar.strip().split("=", 1)
-                    for envvar in subprocess.check_output(
-                        [
-                            f"{vcpath}\\Common7\\Tools\\vsdevcmd.bat",
-                            "-no_logo",
-                            "-arch=amd64",
-                            "-host_arch=amd64",
-                            "&&",
-                            "set",
-                        ],
-                        shell=True,
-                        text=True,
-                        env=env,
-                    )
-                    .strip()
-                    .split("\n")
-                ]
-            )
+        vcvars = subprocess.check_output(
+            [
+                f"{vcpath}\\Common7\\Tools\\vsdevcmd.bat",
+                "-no_logo",
+                "-arch=amd64",
+                "-host_arch=amd64",
+                "&&",
+                "python",
+                "-c",
+                "import os, json, sys; json.dump(dict(os.environ), sys.stdout);",
+            ],
+            shell=True,
+            text=True,
+            env=env,
         )
+        env.update(json.loads(vcvars))
 
     return base_python, env
 

test/test_before_all.py

@@ -36,16 +36,19 @@ def test(tmp_path):
     with (project_dir / "text_info.txt").open(mode="w") as ff:
         print("dummy text", file=ff)
 
-    # build the wheels
+    # write python version information to a temporary file, this is checked in
+    # setup.py
+    #
+    # note, before_all runs in whatever the host environment is, `python`
+    # might be any version of python (even Python 2 on Travis ci!), so this is
+    # written to be broadly compatible
     before_all_command = (
-        """python -c "import os, pathlib, sys; pathlib.Path('{project}/text_info.txt').write_text('sample text '+os.environ.get('TEST_VAL', ''))" && """
-        '''python -c "import pathlib, sys; pathlib.Path('{project}/python_prefix.txt').write_text(sys.prefix)"'''
+        """python -c "import os, sys; f = open('{project}/text_info.txt', 'w'); f.write('sample text '+os.environ.get('TEST_VAL', '')); f.close()" && """
+        '''python -c "import sys; f = open('{project}/python_prefix.txt', 'w'); f.write(sys.prefix); f.close()"'''
     )
     actual_wheels = utils.cibuildwheel_run(
         project_dir,
         add_env={
-            # write python version information to a temporary file, this is
-            # checked in setup.py
             "CIBW_BEFORE_ALL": before_all_command,
             "CIBW_BEFORE_ALL_LINUX": f'{before_all_command} && python -c "import sys; assert sys.version_info >= (3, 8)"',
             "CIBW_ENVIRONMENT": "TEST_VAL='123'",