diff --git a/generate_source_tarball_from-repo.sh b/generate_source_tarball_from-repo.sh
new file mode 100755
index 0000000..dd5f7cb
--- /dev/null
+++ b/generate_source_tarball_from-repo.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+
+set -e
+
+VERSION=$1
+JDK8_URL=http://hg.openjdk.java.net
+
+if test "x${VERSION}" = "x"; then
+    echo "No version specified. A version is of the form 'jdk8-bXX' (such as 'jdk8-b79')"
+    exit -1;
+fi
+
+#for REPO_NAME in jdk8 aarch64-port
+for REPO_NAME in aarch64-port
+do
+    mkdir ${REPO_NAME}
+    pushd ${REPO_NAME}
+
+    REPO_ROOT=${JDK8_URL}/${REPO_NAME}/jdk8
+
+    if [[ "$REPO_NAME" == "aarch64-port" ]] ; then
+        # aarch64-port does not tag trees
+        # FIXME make this clone reproducible
+        hg clone ${REPO_ROOT} -r ${VERSION}
+    else
+        hg clone ${REPO_ROOT} -r ${VERSION}
+    fi
+    pushd jdk8
+
+#    for subrepo in corba hotspot jdk jaxws jaxp langtools nashorn common
+#    it looks like commons have been added as separate repo for jdk8
+#    but not yet for aarch64-port
+    for subrepo in corba hotspot jdk jaxws jaxp langtools nashorn
+    do
+        if [[ "$REPO_NAME" == "aarch64-port" ]] ; then
+            # aarch64-port does not tag trees
+            # FIXME make this clone reproducible
+            hg clone ${REPO_ROOT}/${subrepo}
+        else
+            hg clone ${REPO_ROOT}/${subrepo} -r ${VERSION}
+        fi
+    done
+    rm -rvf jdk/src/share/native/sun/security/ec/impl || echo ok
+
+    popd
+
+    find jdk8 -type d -name ".hg" -exec rm -rf '{}' \; || echo ok
+    tar cJf ${REPO_NAME}-${VERSION}.tar.xz jdk8
+
+    popd
+done
+