From e38e05ff4adf1b0294deacd95e24a2c63c3ab7be Mon Sep 17 00:00:00 2001
From: Daniel La Rocque <dlarocque@google.com>
Date: Wed, 10 Jun 2026 09:40:54 -0500
Subject: [PATCH] build: add PyPI fallback to Python setup (#16228)

---
 cmake/python_setup.cmake | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/cmake/python_setup.cmake b/cmake/python_setup.cmake
index 5a1697af8e..ebc5f662ee 100644
--- a/cmake/python_setup.cmake
+++ b/cmake/python_setup.cmake
@@ -152,14 +152,28 @@ function(FirebaseSetupPythonInterpreter)
       "${LOG_PREFIX}: Installing Python dependencies into "
       "${PYVENV_DIRECTORY}: ${ARG_REQUIREMENTS}"
     )
-    firebase_execute_process(
+    execute_process(
       COMMAND
         "${PYTHON_EXECUTABLE}"
         -m
         pip
         install
         ${ARG_REQUIREMENTS}
+      RESULT_VARIABLE PIP_INSTALL_STATUS
     )
+    if(NOT PIP_INSTALL_STATUS EQUAL 0)
+      message(STATUS "${LOG_PREFIX}: pip install failed. Retrying with public PyPI index...")
+      firebase_execute_process(
+        COMMAND
+          "${PYTHON_EXECUTABLE}"
+          -m
+          pip
+          install
+          --index-url
+          https://pypi.org/simple
+          ${ARG_REQUIREMENTS}
+      )
+    endif()
   endif()
 
   # Write the stamp files.