Remove dependency on Unix tools in Windows

test/test_environment.py

@@ -43,7 +43,7 @@ def test(tmp_path):
         project_dir,
         add_env={
             "CIBW_ENVIRONMENT": """CIBW_TEST_VAR="a b c" CIBW_TEST_VAR_2=1 CIBW_TEST_VAR_3="$(echo 'test string 3')" PATH=$PATH:/opt/cibw_test_path""",
-            "CIBW_ENVIRONMENT_WINDOWS": '''CIBW_TEST_VAR="a b c" CIBW_TEST_VAR_2=1 CIBW_TEST_VAR_3="$(echo 'test string 3')" PATH="$PATH;/opt/cibw_test_path"''',
+            "CIBW_ENVIRONMENT_WINDOWS": '''CIBW_TEST_VAR="a b c" CIBW_TEST_VAR_2=1 CIBW_TEST_VAR_3="$(cmd /C echo test string 3)" PATH="$PATH;/opt/cibw_test_path"''',
         },
     )
 

unit_test/environment_test.py

@@ -1,4 +1,5 @@
 import os
+import sys
 
 from cibuildwheel.environment import parse_environment
 
@@ -28,7 +29,11 @@ def test_inheritance():
 
 
 def test_shell_eval():
-    environment_recipe = parse_environment('VAR="$(echo "a   test" string)"')
+    if sys.platform == "win32":
+        env_string = 'VAR="$(cmd /C "echo a   test string")"'
+    else:
+        env_string = 'VAR="$(echo "a   test" string)"'
+    environment_recipe = parse_environment(env_string)
 
     env_copy = os.environ.copy()
     env_copy.pop("VAR", None)
@@ -39,7 +44,11 @@ def test_shell_eval():
 
 
 def test_shell_eval_and_env():
-    environment_recipe = parse_environment('VAR="$(echo "$PREV_VAR" string)"')
+    if sys.platform == "win32":
+        env_string = 'VAR="$(cmd /C "echo $PREV_VAR string")"'
+    else:
+        env_string = 'VAR="$(echo "$PREV_VAR" string)"'
+    environment_recipe = parse_environment(env_string)
 
     environment_dict = environment_recipe.as_dictionary(prev_environment={"PREV_VAR": "1 2 3"})
 
@@ -73,7 +82,11 @@ def test_no_vars_pass_through():
 
 
 def test_operators_inside_eval():
-    environment_recipe = parse_environment('SOMETHING="$(echo a; echo b; echo c)"')
+    if sys.platform == "win32":
+        env_string = 'SOMETHING="$(cmd /C echo a; cmd /C echo b; cmd /C echo c)"'
+    else:
+        env_string = 'SOMETHING="$(echo a; echo b; echo c)"'
+    environment_recipe = parse_environment(env_string)
 
     # pass the existing process env so PATH is available
     environment_dict = environment_recipe.as_dictionary(os.environ.copy())
@@ -91,9 +104,13 @@ def test_substitution_with_backslash():
 
 
 def test_awkwardly_quoted_variable():
-    environment_recipe = parse_environment(
-        'VAR2=something"like this""$VAR1"$VAR1$(echo "there is more")"$(echo "and more!")"'
-    )
+    if sys.platform == "win32":
+        env_string = 'VAR2=something"like this""$VAR1"$VAR1$(cmd /C echo there is more)"$(cmd /C echo and more!)"'
+    else:
+        env_string = (
+            'VAR2=something"like this""$VAR1"$VAR1$(echo "there is more")"$(echo "and more!")"'
+        )
+    environment_recipe = parse_environment(env_string)
 
     # pass the existing process env so PATH is available
     environment_dict = environment_recipe.as_dictionary({"VAR1": "but wait"})