Add a CI run on OSX

Author: TheBlueMatt

.github/workflows/build.yml

@@ -82,3 +82,102 @@ jobs:
           mvn package
           java -ea -jar target/ldk-java-tests-1.0-SNAPSHOT-jar-with-dependencies.jar
           cd ..
+
+  osx:
+    strategy:
+      matrix:
+        include:
+          - platform: macos-10.15
+          # MacOS 11 is currently in private preview, we've applied for access
+          # - platform: macos-11
+    runs-on: ${{ matrix.platform }}
+    env:
+      TOOLCHAIN: stable
+    steps:
+      - name: Install other Rust platforms
+        run: rustup target install aarch64-apple-darwin
+      - name: Fetch upstream LLVM/clang snapshot
+        run: |
+          wget -O clang+llvm-12.0.0-x86_64-apple-darwin.tar.xz https://github.com/llvm/llvm-project/releases/download/llvmorg-12.0.0/clang+llvm-12.0.0-x86_64-apple-darwin.tar.xz
+          if [ "$(shasum -a 256 clang+llvm-12.0.0-x86_64-apple-darwin.tar.xz | awk '{ print $1 }')" != "7bc2259bf75c003f644882460fc8e844ddb23b27236fe43a2787870a4cd8ab50" ]; then
+            echo "Bad hash"
+            exit 1
+          fi
+      - name: Unpack upstream LLVM+clang and use it by default
+        run: |
+          tar xvvf clang+llvm-12.0.0-x86_64-apple-darwin.tar.xz
+      - name: Checkout source code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Install cbindgen
+        run: cargo install --force cbindgen
+      - name: Checkout Rust-Lightning and LDK-C-Bindings git
+        run: |
+          git config --global user.email "ldk-ci@example.com"
+          git config --global user.name "LDK CI"
+          git clone https://github.com/rust-bitcoin/rust-lightning
+          cd rust-lightning
+          git remote add matt https://git.bitcoin.ninja/rust-lightning
+          git fetch matt
+          git merge matt/2021-03-java-bindings-base
+          cd ..
+          git clone https://github.com/lightningdevkit/ldk-c-bindings
+      - name: Rebuild C bindings with upstream clang, and check the sample app builds + links
+        run: |
+          cd ldk-c-bindings
+          export PATH=`pwd`/clang+llvm-12.0.0-x86_64-apple-darwin/bin:$PATH
+          CC=clang ./genbindings.sh ../rust-lightning true
+          cd ..
+      - name: Fetch OpenJDK 16
+        run: |
+          wget -O openjdk-16.0.1_osx-x64_bin.tar.gz https://download.java.net/java/GA/jdk16.0.1/7147401fd7354114ac51ef3e1328291f/9/GPL/openjdk-16.0.1_osx-x64_bin.tar.gz
+          if [ "$(shasum -a 256 openjdk-16.0.1_osx-x64_bin.tar.gz | awk '{ print $1 }')" != "6098f839954439d4916444757c542c1b8778a32461706812d41cc8bbefce7f2f" ]; then
+            echo "Bad hash"
+            exit 1
+          fi
+          tar xvvf openjdk-16.0.1_osx-x64_bin.tar.gz
+          export JAVA_HOME=`pwd`/jdk-16.0.1.jdk/Contents/Home
+          export PATH=$JAVA_HOME/bin:$PATH
+      - name: Build Java/TS Release Bindings
+        run: |
+          # We assume the top commit is just a bindings update commit, so we
+          # check out the previous commit to use as the commit we git describe.
+          # If the top commit is a merge commit, we need to get the last merge
+          # head and assume the latest bindings are built against its parent.
+          COMMIT_PARENTS=$(git show -s --pretty=format:%P HEAD)
+          if [ "${#COMMIT_PARENTS}" = 40 ]; then
+            export LDK_GARBAGECOLLECTED_GIT_OVERRIDE="$(git describe --tag HEAD^1)"
+          else
+            MERGE_HEAD=$(git show --pretty=format:%P HEAD | ( for last in $(cat /dev/stdin); do true; done; echo $last ))
+            export LDK_GARBAGECOLLECTED_GIT_OVERRIDE="$(git describe --tag $MERGE_HEAD^1)"
+          fi
+          echo "Using $LDK_GARBAGECOLLECTED_GIT_OVERRIDE as git version"
+          # genbindings.sh always fails as there is no wasm32-wasi library
+          # available, so instead we delete the expected JNI library and check
+          # that it was created.
+          rm src/main/resources/liblightningjni_MacOSX-x86_64.nativelib
+          ./genbindings.sh ./ldk-c-bindings/ "-I$JAVA_HOME/include/ -I$JAVA_HOME/include/darwin -isysroot$(xcrun --show-sdk-path)" false false || echo
+          cat src/main/resources/liblightningjni_MacOSX-x86_64.nativelib > /dev/null
+      - name: Fetch Maven 3.8.1
+        run: |
+          wget -O apache-maven-3.8.1-bin.tar.gz https://apache.osuosl.org/maven/maven-3/3.8.1/binaries/apache-maven-3.8.1-bin.tar.gz
+          if [ "$(shasum -a 256 apache-maven-3.8.1-bin.tar.gz | awk '{ print $1 }')" != "b98a1905eb554d07427b2e5509ff09bd53e2f1dd7a0afa38384968b113abef02" ]; then
+            echo "Bad hash"
+            exit 1
+          fi
+          tar xvvf apache-maven-3.8.1-bin.tar.gz
+          export PATH=apache-maven-3.8.1/bin:$PATH
+      - name: Run Java Tests against built jar
+        run: |
+          mvn -DskipTests=true package
+          mvn install:install-file -Dfile=target/ldk-java-1.0-SNAPSHOT.jar -DgroupId=org.ldk -DartifactId=ldk-java -Dversion=1.0-SNAPSHOT -Dpackaging=jar
+          cd javatester
+          mvn package
+          java -ea -jar target/ldk-java-tests-1.0-SNAPSHOT-jar-with-dependencies.jar
+          cd ..
+      - name: Check latest headers and release lib are in git
+        run: |
+          if [ "${{ matrix.platform }}" = "macos-11" ]; then
+            git diff --exit-code
+          fi