Try native image then fallback to pure java version (#717)

* Add script mvnd-auto to auto select native or pure java mvnd

* Move fallback logic into main entry script

1. rename native binary to 'mvnd-native-<os>-<arch>'
2. add environment switch MVND_ENTRY_FALLBACK, default 'true' enables
   the fallback logic, set to 'false' to force execute the native mvnd.
3. rename mvnd.sh to mvnd

* change entry name on windows

* Add script mvnd-persist-native for moving the native image to the default entry path

* improve platform detect

* fix error on dash

* rollback default entry to the native image

* use MVND_CLIENT switch to control the selection of mvnd client

* improve comment docs as suggestion

client/pom.xml

@@ -225,7 +225,7 @@
             <executions>
               <execution>
                 <goals>
-                  <goal>build</goal>
+                  <goal>compile-no-fork</goal>
                 </goals>
                 <phase>package</phase>
               </execution>

dist/src/main/distro/bin/mvnd.cmd

@@ -25,6 +25,12 @@
 @REM   MAVEN_BATCH_PAUSE (Optional) set to 'on' to wait for a key stroke before ending.
 @REM   MAVEN_OPTS        (Optional) Java runtime options used when Maven is executed.
 @REM   MAVEN_SKIP_RC     (Optional) Flag to disable loading of mavenrc files.
+@REM   MVND_CLIENT       (Optional) Control how to select mvnd client to communicate with the daemon:
+@REM                        'auto' (default) - prefer the native client mvnd.exe if it suits the current
+@REM                                           OS and processor architecture; otherwise use the pure
+@REM                                           Java client.
+@REM                        'native' - use the native client mvnd.exe
+@REM                        'jvm' - use the pure Java client
 @REM -----------------------------------------------------------------------------
 
 @REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
@@ -43,6 +49,28 @@ if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
 
 set ERROR_CODE=0
 
+set "MVND_CMD=%~dp0\mvnd.exe"
+if "%MVND_CLIENT%"=="native" goto runNative
+if "%MVND_CLIENT%"=="" goto checkNative
+if not "%MVND_CLIENT%"=="auto" goto runJvm
+
+:checkNative
+@REM try execute native image
+if "%PROCESSOR_ARCHITEW6432%"=="" (
+  if not exist "%~dp0\platform-windows-%PROCESSOR_ARCHITECTURE%" goto runJvm
+) else (
+  if not exist "%~dp0\platform-windows-%PROCESSOR_ARCHITEW6432%" goto runJvm
+)
+if not exist "%MVND_CMD%" goto runJvm
+
+:runNative
+"%MVND_CMD%" %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:runJvm
+@REM fallback to pure java version
+
 @REM ==== START VALIDATION ====
 if not "%JAVA_HOME%"=="" goto OkJHome
 for %%i in (java.exe) do set "JAVACMD=%%~$PATH:i"

dist/src/main/distro/bin/mvnd.sh

@@ -25,6 +25,11 @@
 #   JAVA_HOME       Must point at your Java Development Kit installation.
 #   MAVEN_OPTS      (Optional) Java runtime options used when Maven is executed.
 #   MAVEN_SKIP_RC   (Optional) Flag to disable loading of mavenrc files.
+#   MVND_CLIENT     (Optional) Control how to select mvnd client to communicate with the daemon:
+#                      'auto' (default) - prefer the native client mvnd if it suits the current OS and
+#                                         processor architecture; otherwise use the pure Java client.
+#                      'native' - use the native client mvnd
+#                      'jvm' - use the pure Java client
 # -----------------------------------------------------------------------------
 
 if [ -z "$MAVEN_SKIP_RC" ] ; then
@@ -43,8 +48,8 @@ fi
 cygwin=false;
 mingw=false;
 case "`uname`" in
-  CYGWIN*) cygwin=true;;
-  MINGW*) mingw=true;;
+  CYGWIN*) cygwin=true native_ext=.exe ;;
+  MINGW*) mingw=true native_ext=.exe ;;
 esac
 
 ## resolve links - $0 may be a link to Maven's home
@@ -89,6 +94,36 @@ if $mingw ; then
   # TODO classpath?
 fi
 
+if [ "${MVND_CLIENT:=auto}" = native ]; then
+  # force execute native image
+  exec "$MVND_HOME/bin/mvnd${native_ext:-}" "$@"
+elif [ "$MVND_CLIENT" = auto ]; then
+  # try native image
+  case "$(uname -a)" in
+  (CYGWIN*|MINGW*) os=windows arch="${PROCESSOR_ARCHITEW6432:-"${PROCESSOR_ARCHITECTURE:-"$(uname -m)"}"}" ;;
+  (Darwin*x86_64) os=darwin arch=amd64 ;;
+  (Darwin*arm64) os=darwin arch=aarch64 ;;
+  (Linux*) os=linux arch=$(uname -m) ;;
+  (*) os=$(uname) arch=$(uname -m) ;;
+  esac
+  [ "${arch-}" != x86_64 ] || arch=amd64
+  [ "${arch-}" != AMD64 ] || arch=amd64
+  [ "${arch-}" != arm64 ] || arch=aarch64
+
+  MVND_CMD="$MVND_HOME/bin/mvnd${native_ext:-}"
+  if [ -e "$MVND_HOME/bin/platform-$os-$arch" ] && [ -x "$MVND_CMD" ]; then
+    is_native=true
+    if [ "$os" = linux ]; then
+      case "$(ldd "$MVND_CMD" 2>&1)" in
+      (''|*"not found"*) is_native=false ;;
+      esac
+    fi
+    ! $is_native || exec "$MVND_CMD" "$@"
+  fi
+fi
+
+# fallback to pure java version
+
 if [ -z "$JAVA_HOME" ] ; then
   JAVACMD="`\\unset -f command; \\command -v java`"
 else

dist/src/main/provisio/maven-distro.xml

@@ -79,6 +79,7 @@
             <include>mvnd</include>
             <include>mvnd.exe</include>
         </directory>
+        <file touch="platform-${os.detected.name}-${os.detected.arch}"/>
     </fileSet>
 
     <archive name="maven-mvnd-${project.version}-${os.detected.name}-${os.detected.arch}.zip"