java-utils-2.eclass: Use insinto & insopts instead of vars, #566480

Replace INSDESTTREE and INSOPTIONS internal variable references with
correct calls to insinto & insopts, using a subshell to scope them.

eclass/java-utils-2.eclass

@@ -348,8 +348,10 @@ java-pkg_dojar() {
 				#but first check class version when in strict mode.
 				is-java-strict && java-pkg_verify-classes "${jar}"
 
-				INSDESTTREE="${JAVA_PKG_JARDEST}" \
-					doins "${jar}" || die "failed to install ${jar}"
+				(
+					insinto "${JAVA_PKG_JARDEST}"
+					doins "${jar}"
+				) || die "failed to install ${jar}"
 				java-pkg_append_ JAVA_PKG_CLASSPATH "${JAVA_PKG_JARDEST}/${jar_basename}"
 				debug-print "installed ${jar} to ${D}${JAVA_PKG_JARDEST}"
 			# make a symlink to the original jar if it's symlink
@@ -493,9 +495,11 @@ java-pkg_doso() {
 		if [[ -e "${lib}" ]] ; then
 			# install if it isn't a symlink
 			if [[ ! -L "${lib}" ]] ; then
-				INSDESTTREE="${JAVA_PKG_LIBDEST}" \
-					INSOPTIONS="-m0755" \
-					doins "${lib}" || die "failed to install ${lib}"
+				(
+					insinto "${JAVA_PKG_LIBDEST}"
+					insopts -m0755
+					doins "${lib}"
+				) || die "failed to install ${lib}"
 				java-pkg_append_ JAVA_PKG_LIBRARY "${JAVA_PKG_LIBDEST}"
 				debug-print "Installing ${lib} to ${JAVA_PKG_LIBDEST}"
 			# otherwise make a symlink to the symlink's origin
@@ -724,8 +728,10 @@ java-pkg_dosrc() {
 	done
 
 	# Install the zip
-	INSDESTTREE=${JAVA_PKG_SOURCESPATH} \
-		doins ${zip_path} || die "Failed to install source"
+	(
+		insinto "${JAVA_PKG_SOURCESPATH}"
+		doins ${zip_path}
+	) || die "Failed to install source"
 
 	JAVA_SOURCES="${JAVA_PKG_SOURCESPATH}/${zip_name}"
 
@@ -864,9 +870,11 @@ java-pkg_dowar() {
 		fi
 
 		# Install those files like you mean it
-		INSOPTIONS="-m 0644" \
-			INSDESTTREE=${JAVA_PKG_WARDEST} \
+		(
+			insopts -m0644
+			insinto "${JAVA_PKG_WARDEST}"
 			doins ${warpath}
+		)
 	done
 }