Add shared library for musl-libc (#3143)

Summary:
Add the jni library for musl-libc, specifically for incorporating into Alpine based docker images. The classifier is `musl64`.

I have signed the CLA electronically.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/3143

Differential Revision: D18719372

fbshipit-source-id: 6189d149310b6436d6def7d808566b0234b23313

Makefile

@@ -1731,12 +1731,23 @@ else
 	ARCH := $(shell getconf LONG_BIT)
 endif
 
-ifneq (,$(filter ppc% arm64 aarch64 sparc64, $(MACHINE)))
+ifeq ($(shell ldd /usr/bin/env 2>/dev/null | grep -q musl; echo $$?),0)
-	ROCKSDBJNILIB = librocksdbjni-linux-$(MACHINE).so
+        JNI_LIBC = musl
-else
+# GNU LibC (or glibc) is so pervasive we can assume it is the default
-	ROCKSDBJNILIB = librocksdbjni-linux$(ARCH).so
+# else
+#        JNI_LIBC = glibc
 endif
-ROCKSDB_JAR = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-linux$(ARCH).jar
+
+ifneq ($(origin JNI_LIBC), undefined)
+  JNI_LIBC_POSTFIX = -$(JNI_LIBC)
+endif
+
+ifneq (,$(filter ppc% arm64 aarch64 sparc64, $(MACHINE)))
+	ROCKSDBJNILIB = librocksdbjni-linux-$(MACHINE)$(JNI_LIBC_POSTFIX).so
+else
+	ROCKSDBJNILIB = librocksdbjni-linux$(ARCH)$(JNI_LIBC_POSTFIX).so
+endif
+ROCKSDB_JAR = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-linux$(ARCH)$(JNI_LIBC_POSTFIX).jar
 ROCKSDB_JAR_ALL = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH).jar
 ROCKSDB_JAVADOCS_JAR = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-javadoc.jar
 ROCKSDB_SOURCES_JAR = rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-sources.jar
@@ -1910,12 +1921,12 @@ rocksdbjavastatic: $(java_static_all_libobjects)
 	cd java/src/main/java;jar -cf ../../../target/$(ROCKSDB_SOURCES_JAR) org
 
 rocksdbjavastaticrelease: rocksdbjavastatic
-	cd java/crossbuild && vagrant destroy -f && vagrant up linux32 && vagrant halt linux32 && vagrant up linux64 && vagrant halt linux64
+	cd java/crossbuild && (vagrant destroy -f || true) && vagrant up linux32 && vagrant halt linux32 && vagrant up linux64 && vagrant halt linux64 && vagrant up linux64-musl && vagrant halt linux64-musl
 	cd java;jar -cf target/$(ROCKSDB_JAR_ALL) HISTORY*.md
 	cd java/target;jar -uf $(ROCKSDB_JAR_ALL) librocksdbjni-*.so librocksdbjni-*.jnilib
 	cd java/target/classes;jar -uf ../$(ROCKSDB_JAR_ALL) org/rocksdb/*.class org/rocksdb/util/*.class
 
-rocksdbjavastaticreleasedocker: rocksdbjavastatic rocksdbjavastaticdockerx86 rocksdbjavastaticdockerx86_64
+rocksdbjavastaticreleasedocker: rocksdbjavastatic rocksdbjavastaticdockerx86 rocksdbjavastaticdockerx86_64 rocksdbjavastaticdockerx86musl rocksdbjavastaticdockerx86_64musl
 	cd java;jar -cf target/$(ROCKSDB_JAR_ALL) HISTORY*.md
 	cd java/target;jar -uf $(ROCKSDB_JAR_ALL) librocksdbjni-*.so librocksdbjni-*.jnilib
 	cd java/target/classes;jar -uf ../$(ROCKSDB_JAR_ALL) org/rocksdb/*.class org/rocksdb/util/*.class
@@ -1936,6 +1947,22 @@ rocksdbjavastaticdockerarm64v8:
 	mkdir -p java/target
 	docker run --rm --name rocksdb_linux_arm64v8-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:centos7_arm64v8-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
 
+rocksdbjavastaticdockerx86musl:
+	mkdir -p java/target
+	docker run --rm --name rocksdb_linux_x86-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_x86-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+
+rocksdbjavastaticdockerx86_64musl:
+	mkdir -p java/target
+	docker run --rm --name rocksdb_linux_x64-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_x64-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+
+rocksdbjavastaticdockerppc64lemusl:
+	mkdir -p java/target
+	docker run --rm --name rocksdb_linux_ppc64le-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_ppc64le-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+
+rocksdbjavastaticdockerarm64v8musl:
+	mkdir -p java/target
+	docker run --rm --name rocksdb_linux_arm64v8-musl-be --attach stdin --attach stdout --attach stderr --volume `pwd`:/rocksdb-host:ro --volume /rocksdb-local-build --volume `pwd`/java/target:/rocksdb-java-target --env DEBUG_LEVEL=$(DEBUG_LEVEL) evolvedbinary/rocksjava:alpine3_arm64v8-be /rocksdb-host/java/crossbuild/docker-build-linux-centos.sh
+
 rocksdbjavastaticpublish: rocksdbjavastaticrelease rocksdbjavastaticpublishcentral
 
 rocksdbjavastaticpublishdocker: rocksdbjavastaticreleasedocker rocksdbjavastaticpublishcentral
@@ -1945,6 +1972,8 @@ rocksdbjavastaticpublishcentral:
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-sources.jar -Dclassifier=sources
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-linux64.jar -Dclassifier=linux64
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-linux32.jar -Dclassifier=linux32
+	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-linux64-musl.jar -Dclassifier=linux64-musl
+	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-linux32-musl.jar -Dclassifier=linux32-musl
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-osx.jar -Dclassifier=osx
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH)-win64.jar -Dclassifier=win64
 	mvn gpg:sign-and-deploy-file -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -DpomFile=java/rocksjni.pom -Dfile=java/target/rocksdbjni-$(ROCKSDB_MAJOR).$(ROCKSDB_MINOR).$(ROCKSDB_PATCH).jar

java/RELEASE.md

@@ -4,28 +4,33 @@ RocksDB can be built as a single self contained cross-platform JAR. The cross-pl
 
 Building a cross-platform JAR requires:
 
- * [Vagrant](https://www.vagrantup.com/)
+ * [Docker](https://www.docker.com/docker-community)
- * [Virtualbox](https://www.virtualbox.org/)
  * A Mac OSX machine that can compile RocksDB.
  * Java 7 set as JAVA_HOME.
 
 Once you have these items, run this make command from RocksDB's root source directory:
 
-    make jclean clean rocksdbjavastaticrelease
+    make jclean clean rocksdbjavastaticreleasedocker
 
-This command will build RocksDB natively on OSX, and will then spin up two Vagrant Virtualbox Ubuntu images to build RocksDB for both 32-bit and 64-bit Linux. 
+This command will build RocksDB natively on OSX, and will then spin up docker containers to build RocksDB for 32-bit and 64-bit Linux with glibc, and 32-bit and 64-bit Linux with musl libc.
 
 You can find all native binaries and JARs in the java/target directory upon completion:
 
     librocksdbjni-linux32.so
     librocksdbjni-linux64.so
+    librocksdbjni-linux64-musl.so
+    librocksdbjni-linux32-musl.so
     librocksdbjni-osx.jnilib
-    rocksdbjni-3.5.0-javadoc.jar
+    rocksdbjni-x.y.z-javadoc.jar
-    rocksdbjni-3.5.0-linux32.jar
+    rocksdbjni-x.y.z-linux32.jar
-    rocksdbjni-3.5.0-linux64.jar
+    rocksdbjni-x.y.z-linux64.jar
-    rocksdbjni-3.5.0-osx.jar
+    rocksdbjni-x.y.z-linux64-musl.jar
-    rocksdbjni-3.5.0-sources.jar
+    rocksdbjni-x.y.z-linux32-musl.jar
-    rocksdbjni-3.5.0.jar
+    rocksdbjni-x.y.z-osx.jar
+    rocksdbjni-x.y.z-sources.jar
+    rocksdbjni-x.y.z.jar
+
+Where x.y.z is the built version number of RocksDB.
 
 ## Maven publication
 

java/crossbuild/Vagrantfile

@@ -8,10 +8,28 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
 
   config.vm.define "linux32" do |linux32|
     linux32.vm.box = "bento/centos-6.10-i386"
+    linux32.vm.provision :shell, path: "build-linux-centos.sh"
   end
 
   config.vm.define "linux64" do |linux64|
     linux64.vm.box = "bento/centos-6.10"
+    linux64.vm.provision :shell, path: "build-linux-centos.sh"
+  end
+
+  config.vm.define "linux32-musl" do |musl32|
+    musl32.vm.box = "alpine/alpine32"
+    musl32.vm.box_version = "3.6.0"
+    musl32.vm.provision :shell, path: "build-linux-alpine.sh"
+  end
+
+  config.vm.define "linux64-musl" do |musl64|
+    musl64.vm.box = "generic/alpine36"
+
+    ##  Should use the alpine/alpine64 box, but this issue needs to be fixed first - https://github.com/hashicorp/vagrant/issues/11218 
+    # musl64.vm.box = "alpine/alpine64"
+    # musl64.vm.box_version = "3.6.0"
+
+    musl64.vm.provision :shell, path: "build-linux-alpine.sh"
   end
 
   config.vm.provider "virtualbox" do |v|
@@ -20,7 +38,13 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     v.customize ["modifyvm", :id, "--nictype1", "virtio" ]
   end
 
-  config.vm.provision :shell, path: "build-linux-centos.sh"
+  if Vagrant.has_plugin?("vagrant-cachier")
+    config.cache.scope = :box
+  end
+  if Vagrant.has_plugin?("vagrant-vbguest")
+    config.vbguest.no_install = true
+  end
+
   config.vm.synced_folder "../target", "/rocksdb-build"
   config.vm.synced_folder "../..", "/rocksdb", type: "rsync"
   config.vm.boot_timeout = 1200

java/crossbuild/build-linux-alpine.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+
+set -e
+
+# update Alpine with latest versions
+echo '@edge http://nl.alpinelinux.org/alpine/edge/main' >> /etc/apk/repositories
+echo '@community http://nl.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories
+apk update
+apk upgrade
+
+# install CA certificates
+apk add ca-certificates
+
+# install build tools
+apk add \
+  build-base \
+  coreutils \
+  file \
+  git \
+  perl \
+  automake \
+  autoconf \
+  cmake
+
+# install tool dependencies for building RocksDB static library
+apk add \
+  curl \
+  bash \
+  wget \
+  tar \
+  openssl
+
+# install RocksDB dependencies
+apk add \
+  snappy snappy-dev \
+  zlib zlib-dev \
+  bzip2 bzip2-dev \
+  lz4 lz4-dev \
+  zstd zstd-dev \
+  linux-headers \
+  jemalloc jemalloc-dev
+
+# install OpenJDK7
+apk add openjdk7 \
+  && apk add java-cacerts \
+  && rm /usr/lib/jvm/java-1.7-openjdk/jre/lib/security/cacerts \
+  && ln -s /etc/ssl/certs/java/cacerts /usr/lib/jvm/java-1.7-openjdk/jre/lib/security/cacerts
+
+# cleanup
+rm -rf /var/cache/apk/*
+
+# puts javac in the PATH
+export JAVA_HOME=/usr/lib/jvm/java-1.7-openjdk
+export PATH=/usr/lib/jvm/java-1.7-openjdk/bin:$PATH
+
+# gflags from source
+cd /tmp &&\
+  git clone -b v2.0 --single-branch https://github.com/gflags/gflags.git &&\
+  cd gflags &&\
+  ./configure --prefix=/usr && make && make install &&\
+  rm -rf /tmp/*
+
+
+# build rocksdb
+cd /rocksdb
+make jclean clean
+PORTABLE=1 make -j8 rocksdbjavastatic
+cp /rocksdb/java/target/librocksdbjni-* /rocksdb-build
+cp /rocksdb/java/target/rocksdbjni-* /rocksdb-build

java/crossbuild/docker-build-linux-alpine.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+
+set -e
+#set -x
+
+# just in-case this is run outside Docker
+mkdir -p /rocksdb-local-build
+
+rm -rf /rocksdb-local-build/*
+cp -r /rocksdb-host/* /rocksdb-local-build
+cd /rocksdb-local-build
+
+make clean-not-downloaded
+PORTABLE=1 make rocksdbjavastatic
+
+cp java/target/librocksdbjni-linux*.so java/target/rocksdbjni-*-linux*.jar /rocksdb-java-target
+

java/crossbuild/docker-build-linux-centos.sh

@@ -14,19 +14,19 @@ cd /rocksdb-local-build
 # Use scl devtoolset if available
 if hash scl 2>/dev/null; then
 	if scl --list | grep -q 'devtoolset-7'; then
-               # CentOS 7+
+		# CentOS 7+
-               scl enable devtoolset-7 'make clean-not-downloaded'
+		scl enable devtoolset-7 'make clean-not-downloaded'
 		scl enable devtoolset-7 'PORTABLE=1 make -j2 rocksdbjavastatic'
 	elif scl --list | grep -q 'devtoolset-2'; then
-               # CentOS 5 or 6
+		# CentOS 5 or 6
-               scl enable devtoolset-2 'make clean-not-downloaded'
+		scl enable devtoolset-2 'make clean-not-downloaded'
 		scl enable devtoolset-2 'PORTABLE=1 make -j2 rocksdbjavastatic'
 	else
 		echo "Could not find devtoolset"
 		exit 1;
 	fi
 else
-       make clean-not-downloaded
+	make clean-not-downloaded
         PORTABLE=1 make -j2 rocksdbjavastatic
 fi
 

java/rocksjni.pom

@@ -10,7 +10,7 @@
     <artifactId>rocksdbjni</artifactId>
     <!-- Version will be automatically replaced -->
     <version>-</version>
-    <description>RocksDB fat jar that contains .so files for linux32 and linux64, jnilib files
+    <description>RocksDB fat jar that contains .so files for linux32 and linux64 (glibc and musl-libc), jnilib files
         for Mac OSX, and a .dll for Windows x64.
     </description>
     <licenses>

java/src/main/java/org/rocksdb/util/Environment.java

@@ -1,9 +1,22 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 package org.rocksdb.util;
 
+import java.io.File;
+import java.io.IOException;
+
 public class Environment {
   private static String OS = System.getProperty("os.name").toLowerCase();
   private static String ARCH = System.getProperty("os.arch").toLowerCase();
+  private static boolean MUSL_LIBC;
+
+  static {
+    try {
+      final Process p = new ProcessBuilder("/usr/bin/env", "sh", "-c", "ldd /usr/bin/env | grep -q musl").start();
+      MUSL_LIBC = p.waitFor() == 0;
+    } catch (final IOException | InterruptedException e) {
+      MUSL_LIBC = false;
+    }
+  }
 
   public static boolean isAarch64() {
     return ARCH.contains("aarch64");
@@ -38,6 +51,10 @@ public class Environment {
         OS.contains("nux");
   }
 
+  public static boolean isMuslLibc() {
+    return MUSL_LIBC;
+  }
+
   public static boolean isSolaris() {
     return OS.contains("sunos");
   }
@@ -61,15 +78,37 @@ public class Environment {
     return appendLibOsSuffix("lib" + getSharedLibraryName(name), true);
   }
 
+  /**
+   * Get the name of the libc implementation
+   *
+   * @return the name of the implementation,
+   *    or null if the default for that platform (e.g. glibc on Linux).
+   */
+  public static /* @Nullable */ String getLibcName() {
+    if (isMuslLibc()) {
+      return "musl";
+    } else {
+      return null;
+    }
+  }
+
+  private static String getLibcPostfix() {
+    final String libcName = getLibcName();
+    if (libcName == null) {
+      return "";
+    }
+    return "-" + libcName;
+  }
+
   public static String getJniLibraryName(final String name) {
     if (isUnix()) {
       final String arch = is64Bit() ? "64" : "32";
       if (isPowerPC() || isAarch64()) {
-        return String.format("%sjni-linux-%s", name, ARCH);
+        return String.format("%sjni-linux-%s%s", name, ARCH, getLibcPostfix());
       } else if (isS390x()) {
         return String.format("%sjni-linux%s", name, ARCH);
       } else {
-        return String.format("%sjni-linux%s", name, arch);
+        return String.format("%sjni-linux%s%s", name, arch, getLibcPostfix());
       }
     } else if (isMac()) {
       return String.format("%sjni-osx", name);

java/src/test/java/org/rocksdb/util/EnvironmentTest.java

@@ -16,14 +16,17 @@ import static org.assertj.core.api.Assertions.assertThat;
 public class EnvironmentTest {
   private final static String ARCH_FIELD_NAME = "ARCH";
   private final static String OS_FIELD_NAME = "OS";
+  private final static String MUSL_LIBC_FIELD_NAME = "MUSL_LIBC";
 
   private static String INITIAL_OS;
   private static String INITIAL_ARCH;
+  private static boolean INITIAL_MUSL_LIBC;
 
   @BeforeClass
   public static void saveState() {
     INITIAL_ARCH = getEnvironmentClassField(ARCH_FIELD_NAME);
     INITIAL_OS = getEnvironmentClassField(OS_FIELD_NAME);
+    INITIAL_MUSL_LIBC = getEnvironmentClassField(MUSL_LIBC_FIELD_NAME);
   }
 
   @Test
@@ -53,6 +56,7 @@ public class EnvironmentTest {
   @Test
   public void nix32() {
     // Linux
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
     setEnvironmentClassFields("Linux", "32");
     assertThat(Environment.isWindows()).isFalse();
     assertThat(Environment.getJniLibraryExtension()).
@@ -61,7 +65,17 @@ public class EnvironmentTest {
         isEqualTo("librocksdbjni-linux32.so");
     assertThat(Environment.getSharedLibraryFileName("rocksdb")).
         isEqualTo("librocksdbjni.so");
+    // Linux musl-libc (Alpine)
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, true);
+    assertThat(Environment.isWindows()).isFalse();
+    assertThat(Environment.getJniLibraryExtension()).
+        isEqualTo(".so");
+    assertThat(Environment.getJniLibraryFileName("rocksdb")).
+        isEqualTo("librocksdbjni-linux32-musl.so");
+    assertThat(Environment.getSharedLibraryFileName("rocksdb")).
+        isEqualTo("librocksdbjni.so");
     // UNIX
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
     setEnvironmentClassFields("Unix", "32");
     assertThat(Environment.isWindows()).isFalse();
     assertThat(Environment.getJniLibraryExtension()).
@@ -84,6 +98,7 @@ public class EnvironmentTest {
 
   @Test
   public void nix64() {
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
     setEnvironmentClassFields("Linux", "x64");
     assertThat(Environment.isWindows()).isFalse();
     assertThat(Environment.getJniLibraryExtension()).
@@ -92,7 +107,17 @@ public class EnvironmentTest {
         isEqualTo("librocksdbjni-linux64.so");
     assertThat(Environment.getSharedLibraryFileName("rocksdb")).
         isEqualTo("librocksdbjni.so");
+    // Linux musl-libc (Alpine)
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, true);
+    assertThat(Environment.isWindows()).isFalse();
+    assertThat(Environment.getJniLibraryExtension()).
+        isEqualTo(".so");
+    assertThat(Environment.getJniLibraryFileName("rocksdb")).
+        isEqualTo("librocksdbjni-linux64-musl.so");
+    assertThat(Environment.getSharedLibraryFileName("rocksdb")).
+        isEqualTo("librocksdbjni.so");
     // UNIX
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
     setEnvironmentClassFields("Unix", "x64");
     assertThat(Environment.isWindows()).isFalse();
     assertThat(Environment.getJniLibraryExtension()).
@@ -130,8 +155,37 @@ public class EnvironmentTest {
       isEqualTo("librocksdbjni.dll");
   }
 
+  @Test
+  public void ppc64le() {
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
+    setEnvironmentClassFields("Linux", "ppc64le");
+    assertThat(Environment.isUnix()).isTrue();
+    assertThat(Environment.isPowerPC()).isTrue();
+    assertThat(Environment.is64Bit()).isTrue();
+    assertThat(Environment.getJniLibraryExtension()).isEqualTo(".so");
+    assertThat(Environment.getSharedLibraryName("rocksdb")).isEqualTo("rocksdbjni");
+    assertThat(Environment.getJniLibraryName("rocksdb")).isEqualTo("rocksdbjni-linux-ppc64le");
+    assertThat(Environment.getJniLibraryFileName("rocksdb"))
+        .isEqualTo("librocksdbjni-linux-ppc64le.so");
+    assertThat(Environment.getSharedLibraryFileName("rocksdb")).isEqualTo("librocksdbjni.so");
+    // Linux musl-libc (Alpine)
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, true);
+    setEnvironmentClassFields("Linux", "ppc64le");
+    assertThat(Environment.isUnix()).isTrue();
+    assertThat(Environment.isPowerPC()).isTrue();
+    assertThat(Environment.is64Bit()).isTrue();
+    assertThat(Environment.getJniLibraryExtension()).isEqualTo(".so");
+    assertThat(Environment.getSharedLibraryName("rocksdb")).isEqualTo("rocksdbjni");
+    assertThat(Environment.getJniLibraryName("rocksdb")).isEqualTo("rocksdbjni-linux-ppc64le-musl");
+    assertThat(Environment.getJniLibraryFileName("rocksdb"))
+        .isEqualTo("librocksdbjni-linux-ppc64le-musl.so");
+    assertThat(Environment.getSharedLibraryFileName("rocksdb")).isEqualTo("librocksdbjni.so");
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
+  }
+
   @Test
   public void aarch64() {
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
     setEnvironmentClassFields("Linux", "aarch64");
     assertThat(Environment.isUnix()).isTrue();
     assertThat(Environment.isAarch64()).isTrue();
@@ -142,6 +196,19 @@ public class EnvironmentTest {
     assertThat(Environment.getJniLibraryFileName("rocksdb"))
         .isEqualTo("librocksdbjni-linux-aarch64.so");
     assertThat(Environment.getSharedLibraryFileName("rocksdb")).isEqualTo("librocksdbjni.so");
+    // Linux musl-libc (Alpine)
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, true);
+    setEnvironmentClassFields("Linux", "aarch64");
+    assertThat(Environment.isUnix()).isTrue();
+    assertThat(Environment.isAarch64()).isTrue();
+    assertThat(Environment.is64Bit()).isTrue();
+    assertThat(Environment.getJniLibraryExtension()).isEqualTo(".so");
+    assertThat(Environment.getSharedLibraryName("rocksdb")).isEqualTo("rocksdbjni");
+    assertThat(Environment.getJniLibraryName("rocksdb")).isEqualTo("rocksdbjni-linux-aarch64-musl");
+    assertThat(Environment.getJniLibraryFileName("rocksdb"))
+        .isEqualTo("librocksdbjni-linux-aarch64-musl.so");
+    assertThat(Environment.getSharedLibraryFileName("rocksdb")).isEqualTo("librocksdbjni.so");
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, false);
   }
 
   private void setEnvironmentClassFields(String osName,
@@ -154,9 +221,10 @@ public class EnvironmentTest {
   public static void restoreState() {
     setEnvironmentClassField(OS_FIELD_NAME, INITIAL_OS);
     setEnvironmentClassField(ARCH_FIELD_NAME, INITIAL_ARCH);
+    setEnvironmentClassField(MUSL_LIBC_FIELD_NAME, INITIAL_MUSL_LIBC);
   }
 
-  private static String getEnvironmentClassField(String fieldName) {
+  private static <T> T getEnvironmentClassField(String fieldName) {
     final Field field;
     try {
       field = Environment.class.getDeclaredField(fieldName);
@@ -164,13 +232,13 @@ public class EnvironmentTest {
       final Field modifiersField = Field.class.getDeclaredField("modifiers");
       modifiersField.setAccessible(true);
       modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
-      return (String)field.get(null);
+      return (T)field.get(null);
     } catch (NoSuchFieldException | IllegalAccessException e) {
       throw new RuntimeException(e);
     }
   }
 
-  private static void setEnvironmentClassField(String fieldName, String value) {
+  private static void setEnvironmentClassField(String fieldName, Object value) {
     final Field field;
     try {
       field = Environment.class.getDeclaredField(fieldName);