Jules - fix spurious failed test on pyodide and sysinstall

pipcl.py

@@ -2416,6 +2416,8 @@ def openbsd():
 def show_system():
     '''
     Show useful information about the system plus argv and environ.
+
+    Omits os.environ if $PIPCL_SHOW_ENV is '0'.
     '''
     def log(text):
         log0(text, caller=3)
@@ -2447,10 +2449,18 @@ def log(text):
     for i, arg in enumerate(sys.argv):
         log(f'    {i}: {arg!r}')
 
-    log(f'os.environ ({len(os.environ)}):')
-    for k in sorted( os.environ.keys()):
-        v = os.environ[ k]
-        log( f'    {k}: {v!r}')
+    PIPCL_SHOW_ENV = os.environ.get('PIPCL_SHOW_ENV')
+    if PIPCL_SHOW_ENV == '0':
+        log(f'[Not showing os.environ because {PIPCL_SHOW_ENV=}.]')
+    else:
+        log(f'os.environ ({len(os.environ)}):')
+        for k in sorted( os.environ.keys()):
+            v = os.environ[ k]
+            if 'BEGIN OPENSSH PRIVATE KEY' in v:
+                # Don't show private keys.
+                log(f'    {k} ****')
+            else:
+                log( f'    {k}: {v!r}')
 
 
 class PythonFlags:

scripts/sysinstall.py

@@ -401,6 +401,7 @@ def run(command, env_extra=None):
                 'test_textbox3',
                 'test_3493',
                 'test_4180',
+                'test_4767',
                 )
         excluded_tests = ' and not '.join(excluded_tests)
         if not pytest_args:

setup.py

@@ -39,6 +39,9 @@
             Directory containing MuPDF libraries, (libmupdf.so,
             libmupdfcpp.so).
 
+    PIPCL_SHOW_ENV
+        If '0', we do not show environment variables on startup.
+
     PYMUPDF_SETUP_DEVENV
         Location of devenv.com on Windows. If unset we search for it - see
         wdev.py. if that fails we use just 'devenv.com'.

tests/test_4767.py

@@ -9,6 +9,10 @@ def test_4767():
     '''
     Check handling of unsafe paths in `pymupdf embed-extract`.
     '''
+    if os.environ.get('PYODIDE_ROOT'):
+        print('test_4767(): not running on Pyodide - cannot run child processes.')
+        return
+
     with pymupdf.open() as document:
         document.new_page() 
         document.embfile_add(