Add support for Rosetta 2 on Silicon Mac.

This will allow users of the new Mac arm64 architecture to keep using
the x86_64 java binaries through the Rosetta 2 compatiblity layer. It
relies on the `sdkman_rosetta2_compatible` configuration to be set to
`true` in their `.sdkman/etc/config` file.

Author: marc0der

src/main/bash/sdkman-init.sh

@@ -29,8 +29,12 @@ if [ -z "$SDKMAN_DIR" ]; then
 	export SDKMAN_DIR="$HOME/.sdkman"
 fi
 
-# infer platform
+# Load the sdkman config if it exists.
+if [ -f "${SDKMAN_DIR}/etc/config" ]; then
+	source "${SDKMAN_DIR}/etc/config"
+fi
 
+# infer platform
 function infer_platform() {
 	local kernel
 	local machine
@@ -66,8 +70,12 @@ function infer_platform() {
 	  x86_64)
 		echo "DarwinX64"
 		;;
-	  arm64)    
-		echo "DarwinARM64"
+	  arm64)
+		if [[ "$sdkman_rosetta2_compatible" == 'true' ]]; then
+			echo "DarwinX64"
+		else
+			echo "DarwinARM64"
+		fi
 		;;
 	  *)
 	  	echo "DarwinX64"
@@ -127,11 +135,6 @@ done
 IFS="$OLD_IFS"
 unset OLD_IFS scripts f
 
-# Load the sdkman config if it exists.
-if [ -f "${SDKMAN_DIR}/etc/config" ]; then
-	source "${SDKMAN_DIR}/etc/config"
-fi
-
 # Create upgrade delay file if it doesn't exist
 if [[ ! -f "${SDKMAN_DIR}/var/delay_upgrade" ]]; then
 	touch "${SDKMAN_DIR}/var/delay_upgrade"

src/test/groovy/sdkman/specs/PlatformSpec.groovy

@@ -6,30 +6,48 @@ class PlatformSpec extends SdkmanEnvSpecification {
 	def setup() {
 		sdkmanBashEnvBuilder.withCandidates(["groovy"])
 	}
-	
+
 	def "should set platform based on uname"() {
 		given:
 		unameStub.forKernel(kernel).forMachine(machine)
 		bash = sdkmanBashEnvBuilder.withUnameStub(unameStub).build()
 		bash.start()
 		bash.execute("source $bootstrapScript")
 		bash.execute('echo $SDKMAN_PLATFORM')
-		
+
 		expect:
 		bash.output.contains(platform)
-		
+
 		where:
-		kernel 		| machine	| platform
-		"Linux"		| "i686"	| "LinuxX32"
-		"Linux" 	| "x86_64"	| "LinuxX64"
-		"Linux"		| "armv7l"	| "LinuxARM32"
-		"Linux"		| "armv8l"	| "LinuxARM64"
-		"Linux"		| "aarch64"	| "LinuxARM64"
-		"Linux"     | ""	    | "LinuxX64"
-		"Darwin"	| "x86_64"	| "DarwinX64"
-		"Darwin"	| "arm64"	| "DarwinARM64"
-		"Darwin"    | ""        | "DarwinX64"
-		"MSYS64"	| "i686"	| "MSYS64"
-		"MSYS64"    | ""  		| "MSYS64"
+		kernel   | machine   | platform
+		"Linux"  | "i686"    | "LinuxX32"
+		"Linux"  | "x86_64"  | "LinuxX64"
+		"Linux"  | "armv7l"  | "LinuxARM32"
+		"Linux"  | "armv8l"  | "LinuxARM64"
+		"Linux"  | "aarch64" | "LinuxARM64"
+		"Linux"  | ""        | "LinuxX64"
+		"Darwin" | "x86_64"  | "DarwinX64"
+		"Darwin" | "arm64"   | "DarwinARM64"
+		"Darwin" | ""        | "DarwinX64"
+		"MSYS64" | "i686"    | "MSYS64"
+		"MSYS64" | ""        | "MSYS64"
+	}
+
+	def "should enable rosetta 2 compatibility mode with environment variable"() {
+		given:
+		unameStub.forKernel("Darwin").forMachine("arm64")
+		bash = sdkmanBashEnvBuilder
+				.withUnameStub(unameStub)
+				.withConfiguration("sdkman_rosetta2_compatible", "true")
+				.build()
+		bash.start()
+		bash.execute("source $bootstrapScript")
+
+		when:
+		bash.execute('echo $SDKMAN_PLATFORM')
+
+		then:
+		!bash.output.contains("DarwinARM64")
+		bash.output.contains("DarwinX64")
 	}
 }