Windows msys cache

.travis.yml

@@ -77,20 +77,22 @@ matrix:
         - JDK="adopt-openj9@1.11"
       before_install:
         - [[ ! -f C:/tools/msys64/msys2_shell.cmd ]] && rm -rf C:/tools/msys64
-            choco uninstall -y mingw
-            choco upgrade --no-progress -y msys2
-            export msys2='cmd //C RefreshEnv.cmd '
-            export msys2+='& set MSYS=winsymlinks:nativestrict '
-            export msys2+='& C:\\tools\\msys64\\msys2_shell.cmd -defterm -no-start'
-            export mingw64="$msys2 -mingw64 -full-path -here -c "\"\$@"\" --"
-            export msys2+=" -msys2 -c "\"\$@"\" --"
-            $msys2 pacman --sync --noconfirm --needed mingw-w64-x86_64-toolchain libtool automake
-            taskkill //IM gpg-agent.exe //F  # https://travis-ci.community/t/4967
-            export PATH=/C/tools/msys64/mingw64/bin:$PATH
-            export MAKE=mingw32-make  # so that Autotools can find it
-            ;;
+        - choco uninstall -y mingw
+        - choco upgrade --no-progress -y msys2
+        - export msys2='cmd //C RefreshEnv.cmd '
+        - export msys2+='& set MSYS=winsymlinks:nativestrict '
+        - export msys2+='& C:\\tools\\msys64\\msys2_shell.cmd -defterm -no-start'
+        - export mingw64="$msys2 -mingw64 -full-path -here -c "\"\$@"\" --"
+        - export msys2+=" -msys2 -c "\"\$@"\" --"
+        - $msys2 pacman --sync --noconfirm --needed mingw-w64-x86_64-toolchain libtool automake
+        - taskkill //IM gpg-agent.exe //F  # https://travis-ci.community/t/4967
+        - export PATH=/C/tools/msys64/mingw64/bin:$PATH
+        - export MAKE=mingw32-make  # so that Autotools can find it
         - curl "${GRAVIS}.install-jdk-travis.sh" --output ~/.install-jdk-travis.sh
         - source ~/.install-jdk-travis.sh
+      before_cache:
+        # https://unix.stackexchange.com/a/137322/107554
+        - $msys2 pacman --sync --clean --noconfirm
       script:
         - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then ./windowsBuild.sh; fi'
         - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then ./windowsBuildAndPublish.sh; fi'