fix CI: switch to python3 for pio (#7035)

Author: d-a-v

.travis.yml

@@ -24,11 +24,15 @@ jobs:
     - name: "Platformio (1)"
       stage: build
       script: $TRAVIS_BUILD_DIR/tests/platformio.sh
+      install:
+          - sudo apt-get install python3-pip python3-setuptools
       env:
         - BUILD_PARITY=even
     - name: "Platformio (2)"
       stage: build
       script: $TRAVIS_BUILD_DIR/tests/platformio.sh
+      install:
+          - sudo apt-get install python3-pip python3-setuptools
       env:
         - BUILD_PARITY=odd
 

tests/platformio.sh

@@ -6,13 +6,13 @@ source "$TRAVIS_BUILD_DIR"/tests/common.sh
 
 function install_platformio()
 {
-    pip install --user -U https://github.com/platformio/platformio/archive/develop.zip
+    pip3 install --user -U https://github.com/platformio/platformio/archive/develop.zip
     platformio platform install "https://github.com/platformio/platform-espressif8266.git#feature/stage"
     sed -i 's/https:\/\/github\.com\/esp8266\/Arduino\.git/*/' ~/.platformio/platforms/espressif8266/platform.json
-    ln -s $TRAVIS_BUILD_DIR ~/.platformio/packages/framework-arduinoespressif8266
+    ln -sf $TRAVIS_BUILD_DIR ~/.platformio/packages/framework-arduinoespressif8266
     # Install dependencies:
     # - esp8266/examples/ConfigFile
-    pio lib install "ArduinoJson@^6.11.0"
+    pio lib --global install "ArduinoJson@^6.11.0"
 }
 
 function build_sketches_with_platformio()

tests/run_CI_locally.sh

@@ -80,9 +80,6 @@ EOF
 	test -z "$BUILD_TYPE" || break
 done
 
-# use pip2 for python2 with python3 is around, platformio doesn't like it
-cp tests/platformio.sh tests/platformio-custom.sh
-sed -i 's,pip ,pip2 ,g' tests/platformio-custom.sh
 
 git submodule update --init
 
@@ -117,11 +114,11 @@ elif [ "$BUILD_TYPE" = "build1_odd" ]; then
     BUILD_PARITY=odd tests/build1.sh
 
 elif [ "$BUILD_TYPE" = "platformio" ]; then
-    tests/platformio-custom.sh
+    tests/platformio.sh
 elif [ "$BUILD_TYPE" = "platformio_even" ]; then
-    BUILD_PARITY=even tests/platformio-custom.sh
+    BUILD_PARITY=even tests/platformio.sh
 elif [ "$BUILD_TYPE" = "platformio_odd" ]; then
-    BUILD_PARITY=odd tests/platformio-custom.sh
+    BUILD_PARITY=odd tests/platformio.sh
 
 elif [ "$BUILD_TYPE" = host ]; then
     tests/ci/host_test.sh