Update pypi default index url

.github/workflows/build_wheels_macos_m1.yml

@@ -34,6 +34,7 @@ jobs:
       SDIST: ${{ matrix.build_sdist || 0 }}
       ENABLE_HEADLESS: ${{ matrix.without_gui }}
       ENABLE_CONTRIB: ${{ matrix.with_contrib }}
+      PIP_INDEX_URL: https://pypi.tuna.tsinghua.edu.cn/simple
     steps:
     - name: Cleanup
       run: find . -mindepth 1 -delete
@@ -82,6 +83,7 @@ jobs:
     env:
       OPENCV_TEST_DATA_PATH: ${{ github.workspace }}/opencv_extra/testdata
       PYLINT_TEST_FILE: ${{ github.workspace }}/opencv/samples/python/squares.py
+      PIP_INDEX_URL: https://pypi.tuna.tsinghua.edu.cn/simple
     steps:
     - name: Cleanup
       run: find . -mindepth 1 -delete

travis_config.sh

@@ -36,6 +36,11 @@ else
   echo "    > Linux environment "
   export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/Qt5.15.0/lib
   export MAKEFLAGS="-j$(grep -E '^processor[[:space:]]*:' /proc/cpuinfo | wc -l)"
+  if [[ $PLAT == 'aarch64' ]]; then
+    # To avoid network issues with pypi.org on OpenCV CN machines
+    export PIP_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
+    echo "Running for linux aarch64"
+  fi
 fi
 
 if [ -n "$IS_OSX" ]; then