nativeaccess: try to load all located libsystemds

docs/changelog/108238.yaml

@@ -0,0 +1,6 @@
+pr: 108238
+summary: "Nativeaccess: try to load all located libsystemds"
+area: Infra/Core
+type: bug
+issues:
+ - 107878

libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkSystemdLibrary.java

@@ -17,7 +17,10 @@
 import java.lang.foreign.MemorySegment;
 import java.lang.invoke.MethodHandle;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
 
 import static java.lang.foreign.ValueLayout.ADDRESS;
 import static java.lang.foreign.ValueLayout.JAVA_INT;
@@ -26,31 +29,49 @@
 class JdkSystemdLibrary implements SystemdLibrary {
 
  static {
- System.load(findLibSystemd());
- }
-
- // On some systems libsystemd does not have a non-versioned symlink. System.loadLibrary only knows how to find
- // non-versioned library files. So we must manually check the library path to find what we need.
- static String findLibSystemd() {
- final String libsystemd = "libsystemd.so.0";
- String libpath = System.getProperty("java.library.path");
- for (String basepathStr : libpath.split(":")) {
- var basepath = Paths.get(basepathStr);
- if (Files.exists(basepath) == false) {
- continue;
+ // Find and load libsystemd. We attempt all instances of
+ // libsystemd in case of multiarch systems, and stop when
+ // one is successfully loaded. If none can be loaded,
+ // UnsatisfiedLinkError will be thrown.
+ List<String> paths = findLibSystemd();
+ if (paths.isEmpty()) {
+ String libpath = System.getProperty("java.library.path");
+ throw new UnsatisfiedLinkError("Could not find libsystemd in java.library.path: " + libpath);
+ }
+ UnsatisfiedLinkError last = null;
+ for (String path : paths) {
+ try {
+ System.load(path);
+ last = null;
+ break;
+ } catch (UnsatisfiedLinkError e) {
+ last = e;
  }
- try (var stream = Files.walk(basepath)) {
+ }
+ if (last != null) {
+ throw last;
+ }
+ }
 
- var foundpath = stream.filter(Files::isDirectory).map(p -> p.resolve(libsystemd)).filter(Files::exists).findAny();
- if (foundpath.isPresent()) {
- return foundpath.get().toAbsolutePath().toString();
- }
+ // findLibSystemd returns a list of paths to instances of libsystemd
+ // found within java.library.path.
+ static List<String> findLibSystemd() {
+ // Note: on some systems libsystemd does not have a non-versioned symlink.
+ // System.loadLibrary only knows how to find non-versioned library files,
+ // so we must manually check the library path to find what we need.
+ final Path libsystemd = Paths.get("libsystemd.so.0");
+ final String libpath = System.getProperty("java.library.path");
+ return Arrays.stream(libpath.split(":")).map(Paths::get).filter(Files::exists).flatMap(p -> {
+ try {
+ return Files.find(
+ p,
+ Integer.MAX_VALUE,
+ (fp, attrs) -> (attrs.isDirectory() == false && fp.getFileName().equals(libsystemd))
+ );
  } catch (IOException e) {
  throw new UncheckedIOException(e);
  }
-
- }
- throw new UnsatisfiedLinkError("Could not find " + libsystemd + " in java.library.path: " + libpath);
+ }).map(p -> p.toAbsolutePath().toString()).toList();
  }
 
  private static final MethodHandle sd_notify$mh = downcallHandle("sd_notify", FunctionDescriptor.of(JAVA_INT, JAVA_INT, ADDRESS));