Bug 1776104 - Verify that the paths exist before writing ThirdPartyPaths.cpp. r=andi

Differential Revision: https://phabricator.services.mozilla.com/D150069

build/clang-plugin/ThirdPartyPaths.py

@@ -1,6 +1,17 @@
 #!/usr/bin/env python3
 
+import glob
 import json
+import sys
+
+# Import buildconfig if available, otherwise set has_buildconfig to False so
+# we skip the check which relies on it.
+try:
+    import buildconfig
+except ImportError:
+    has_buildconfig = False
+else:
+    has_buildconfig = True
 
 
 def generate(output, *input_paths):
@@ -11,6 +22,7 @@ def generate(output, *input_paths):
     """
     tpp_list = []
     lines = set()
+    path_found = True
 
     for path in input_paths:
         with open(path) as f:
@@ -20,7 +32,25 @@ def generate(output, *input_paths):
         line = line.strip()
         if line.endswith("/"):
             line = line[:-1]
+
+        if has_buildconfig:
+            # Ignore lines starting with $UNVALIDATED
+            # These should only be coming from Unvalidated.txt
+            if line.startswith("$UNVALIDATED"):
+                line = line[13:]
+            elif not glob.glob(buildconfig.topsrcdir + "/" + line):
+                path_found = False
+
+        if path_found:
             tpp_list.append(line)
+        else:
+            print(
+                "Third-party path "
+                + line
+                + " does not exist. Remove it from Generated.txt or "
+                + "ThirdPartyPaths.txt and try again."
+            )
+            sys.exit(1)
     tpp_strings = ",\n  ".join([json.dumps(tpp) for tpp in sorted(tpp_list)])
 
     output.write(

build/clang-plugin/import_mozilla_checks.py

@@ -95,8 +95,14 @@ def add_moz_module(cmake_path):
 def write_third_party_paths(mozilla_path, module_path):
     tpp_txt = os.path.join(mozilla_path, "../../tools/rewriting/ThirdPartyPaths.txt")
     generated_txt = os.path.join(mozilla_path, "../../tools/rewriting/Generated.txt")
+    # Unvalidated.txt is used for rare cases where we don't want to validate that a given
+    # path exists but still want it included in the ThirdPartyPaths check in the plugin.
+    # For example, headers exported to dist/include that live elsewhere.
+    unvalidated_txt = os.path.join(
+        mozilla_path, "../../tools/rewriting/Unvalidated.txt"
+    )
     with open(os.path.join(module_path, "ThirdPartyPaths.cpp"), "w") as f:
-        ThirdPartyPaths.generate(f, tpp_txt, generated_txt)
+        ThirdPartyPaths.generate(f, tpp_txt, generated_txt, unvalidated_txt)
 
 
 def generate_thread_allows(mozilla_path, module_path):

build/clang-plugin/moz.build

@@ -70,8 +70,9 @@ GeneratedFile(
     script="ThirdPartyPaths.py",
     entry_point="generate",
     inputs=[
-        "/tools/rewriting/ThirdPartyPaths.txt",
         "/tools/rewriting/Generated.txt",
+        "/tools/rewriting/ThirdPartyPaths.txt",
+        "/tools/rewriting/Unvalidated.txt",
     ],
 )
 

tools/rewriting/Unvalidated.txt

@@ -0,0 +1 @@
+$UNVALIDATED/function2