Add musl-libc experimental builds

This change adds experimental support for building JDBC driver with
musl libc on x86_64 and aarch64 Linux. It is based on #120 PR.

New artifacts are NOT combined into the unified JAR, instead they are
published to Maven with custom classifiers `linux_amd64_musl` and
`linux_aarch64_musl`.

Co-authored-by: hrl20 <[email protected]>

Author: staticlibs

.github/workflows/Java.yml

@@ -115,6 +115,96 @@ jobs:
           path: |
             build/release/duckdb_jdbc.jar
 
+  java-linux-amd64-musl:
+    name: Java Linux (amd64-musl)
+    runs-on: ubuntu-latest
+    needs: java-linux-amd64
+    env:
+      ALPINE_IMAGE: alpine:3.21
+      ALPINE_PACKAGES: cmake g++ make openjdk8-jdk samurai
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Build
+        shell: bash
+        run: |
+          docker run                               \
+          -v.:/duckdb                              \
+          -e GEN=ninja                             \
+          -e JAVA_HOME=/usr/lib/jvm/java-8-openjdk \
+          ${{ env.ALPINE_IMAGE }}                  \
+          sh -c 'apk add ${{ env.ALPINE_PACKAGES }} && make -C /duckdb release'
+
+      - name: JDBC Tests
+        shell: bash
+        if: ${{ inputs.skip_tests != 'true' }}
+        run: |
+          docker run                               \
+          -v.:/duckdb                              \
+          -e GEN=ninja                             \
+          -e JAVA_HOME=/usr/lib/jvm/java-8-openjdk \
+          ${{ env.ALPINE_IMAGE }}                  \
+          sh -c 'apk add ${{ env.ALPINE_PACKAGES }} && make -C /duckdb test'
+
+      - name: Deploy
+        shell: bash
+        run: |
+          cp build/release/duckdb_jdbc.jar duckdb_jdbc-linux-amd64-musl.jar
+          ./scripts/upload-assets-to-staging.sh github_release duckdb_jdbc-linux-amd64-musl.jar
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: java-linux-amd64-musl
+          path: |
+            build/release/duckdb_jdbc.jar
+
+  java-linux-aarch64-musl:
+    name: Java Linux (aarch64-musl)
+    runs-on: ubuntu-24.04-arm
+    needs: java-linux-amd64
+    env:
+      ALPINE_IMAGE: alpine:3.21
+      ALPINE_PACKAGES: cmake g++ make openjdk8-jdk samurai
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Build
+        shell: bash
+        run: |
+          docker run                               \
+          -v.:/duckdb                              \
+          -e GEN=ninja                             \
+          -e JAVA_HOME=/usr/lib/jvm/java-8-openjdk \
+          ${{ env.ALPINE_IMAGE }}                  \
+          sh -c 'apk add ${{ env.ALPINE_PACKAGES }} && make -C /duckdb release'
+
+      # Test runs are failing because of linux_arm64_musl extensions missing
+      - name: JDBC Tests
+        shell: bash
+        if: ${{ inputs.skip_tests != 'true' }}
+        run: |
+          docker run                               \
+          -v.:/duckdb                              \
+          -e GEN=ninja                             \
+          -e JAVA_HOME=/usr/lib/jvm/java-8-openjdk \
+          ${{ env.ALPINE_IMAGE }}                  \
+          sh -c 'apk add ${{ env.ALPINE_PACKAGES }} && (make -C /duckdb test || true)'
+
+      - name: Deploy
+        shell: bash
+        run: |
+          cp build/release/duckdb_jdbc.jar duckdb_jdbc-linux-aarch64-musl.jar
+          ./scripts/upload-assets-to-staging.sh github_release duckdb_jdbc-linux-aarch64-musl.jar
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: java-linux-aarch64-musl
+          path: |
+            build/release/duckdb_jdbc.jar
 
   java-windows-amd64:
     name: Java Windows (amd64)
@@ -197,8 +287,10 @@ jobs:
     name: Java Combine
     runs-on: ubuntu-latest
     needs:
-      - java-linux-aarch64
       - java-linux-amd64
+      - java-linux-aarch64
+      - java-linux-amd64-musl
+      - java-linux-aarch64-musl
       - java-windows-amd64
       - java-osx-universal
 
@@ -210,15 +302,25 @@ jobs:
       - shell: bash
         run: mkdir jdbc-artifacts
 
+      - uses: actions/download-artifact@v4
+        with:
+          name: java-linux-amd64
+          path: jdbc-artifacts/java-linux-amd64
+
       - uses: actions/download-artifact@v4
         with:
           name: java-linux-aarch64
           path: jdbc-artifacts/java-linux-aarch64
 
       - uses: actions/download-artifact@v4
         with:
-          name: java-linux-amd64
-          path: jdbc-artifacts/java-linux-amd64
+          name: java-linux-amd64-musl
+          path: jdbc-artifacts/java-linux-amd64-musl
+
+      - uses: actions/download-artifact@v4
+        with:
+          name: java-linux-aarch64-musl
+          path: jdbc-artifacts/java-linux-aarch64-musl
 
       - uses: actions/download-artifact@v4
         with:
@@ -303,8 +405,10 @@ jobs:
     name: Merge vendoring PR 
     if: ${{ github.repository == 'duckdb/duckdb-java' && github.event_name == 'pull_request' && github.head_ref == format('vendoring-{0}', github.base_ref) }}
     needs:
-      - java-linux-aarch64
       - java-linux-amd64
+      - java-linux-aarch64
+      - java-linux-amd64-musl
+      - java-linux-aarch64-musl
       - java-windows-amd64
       - java-osx-universal
     runs-on: ubuntu-latest

scripts/jdbc_maven_deploy.py

@@ -30,7 +30,7 @@ def exec(cmd):
 
 
 if len(sys.argv) < 4 or not os.path.isdir(sys.argv[2]) or not os.path.isdir(sys.argv[3]):
-    print("Usage: [release_tag, format: v1.2.3] [artifact_dir] [jdbc_root_path]")
+    print("Usage: [release_tag, format: v1.2.3.4] [artifact_dir] [jdbc_root_path]")
     exit(1)
 
 version_regex = re.compile(r'^v((\d+)\.(\d+)\.\d+\.\d+)$')
@@ -59,6 +59,8 @@ def exec(cmd):
 jdbc_root_path = sys.argv[3]
 
 combine_builds = ['linux-amd64', 'osx-universal', 'windows-amd64', 'linux-aarch64']
+arch_specific_builds = ['linux-amd64-musl', 'linux-aarch64-musl']
+arch_specific_classifiers = ['linux_amd64_musl', 'linux_aarch64_musl']
 
 staging_dir = tempfile.mkdtemp()
 
@@ -67,6 +69,12 @@ def exec(cmd):
 sources_jar = '%s/duckdb_jdbc-%s-sources.jar' % (staging_dir, release_version)
 javadoc_jar = '%s/duckdb_jdbc-%s-javadoc.jar' % (staging_dir, release_version)
 
+arch_specific_jars = []
+for i in range(len(arch_specific_builds)):
+  build = arch_specific_builds[i]
+  classifier = arch_specific_classifiers[i]
+  arch_specific_jars.append('%s/duckdb_jdbc-%s-%s.jar' % (staging_dir, release_version, classifier))
+
 pom_template = """
 <project>
   <modelVersion>4.0.0</modelVersion>
@@ -145,6 +153,13 @@ def exec(cmd):
 exec("jar -cvf %s -C %s ." % (javadoc_jar, javadoc_stage_dir))
 exec("jar -cvf %s -C %s/src/main/java org" % (sources_jar, jdbc_root_path))
 
+# copy arch-specific JARs
+for i in range(len(arch_specific_builds)):
+  build = arch_specific_builds[i]
+  src_jar = os.path.join(jdbc_artifact_dir, "java-" + build, "duckdb_jdbc.jar")
+  dest_jar = arch_specific_jars[i] 
+  shutil.copyfile(src_jar, dest_jar)
+
 # make sure all files exist before continuing
 if (
     not os.path.exists(javadoc_jar)
@@ -178,12 +193,19 @@ def exec(cmd):
 for jar in [binary_jar, sources_jar, javadoc_jar]:
     shutil.copyfile(jar, os.path.join(results_dir, os.path.basename(jar)))
 
+for jar in arch_specific_jars:
+    shutil.copyfile(jar, os.path.join(results_dir, os.path.basename(jar)))
+
 print("JARs created, uploading (this can take a while!)")
 deploy_cmd_prefix = 'mvn --no-transfer-progress gpg:sign-and-deploy-file -Durl=%s -DrepositoryId=ossrh' % deploy_url
 exec("%s -DpomFile=%s -Dfile=%s" % (deploy_cmd_prefix, pom, binary_jar))
 exec("%s -Dclassifier=sources -DpomFile=%s -Dfile=%s" % (deploy_cmd_prefix, pom, sources_jar))
 exec("%s -Dclassifier=javadoc -DpomFile=%s -Dfile=%s" % (deploy_cmd_prefix, pom, javadoc_jar))
 
+for i in range(len(arch_specific_builds)):
+  classifier = arch_specific_classifiers[i]
+  jar = arch_specific_jars[i]
+  exec("%s -Dclassifier=%s -DpomFile=%s -Dfile=%s" % (deploy_cmd_prefix, classifier, pom, jar))
 
 if not is_release:
     print("Not a release, not closing repo")