diff --git a/git-hg/add-branch-without-modules.sh b/git-hg/add-branch-without-modules.sh
new file mode 100755
index 000000000..2841b4e56
--- /dev/null
+++ b/git-hg/add-branch-without-modules.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+################################################################################
+# add-branch-without-modules
+#
+# Local setup of the Git clone branches for the OpenJDK10 (updates) mercurial
+# repository
+#
+# Initial repo will be pushed to git@github.com:AdoptOpenJDK/openjdk-jdk10u.git
+#
+################################################################################
+
+set -euo pipefail
+
+echo "Import common functionality"
+# shellcheck disable=SC1091
+source import-common.sh
+
+echo "Enter hg"
+cd hg || exit 1
+
+bpath=$1
+branch=$2
+
+echo "Create $bpath"
+mkdir -p "$bpath" || exit 1
+
+echo "git hg clone $bpath (root)"
+git hg clone "http://hg.openjdk.java.net/$bpath" "$bpath/root" || exit 1
+
+echo "checkout the $branch"
+if [ "$branch" != "" ]; then
+  cd "$bpath/root" || exit 1
+  git-hg checkout "$branch" || exit 1
+  cd - || exit 1
+fi
+
+echo "Enter ../combined"
+cd ../combined || exit 1
+
+echo "checkout the master branch"
+git checkout -b master || exit 1
+
+echo "Add remote for (root)"
+git remote add "imports/$bpath/root" "../hg/$bpath/root" || exit 1
+
+echo "Fetch (root)"
+git fetch "imports/$bpath/root" || exit 1
+
+echo "Merge (root)"
+git merge "imports/$bpath/root/master" -m "Initial merge of (root)" || exit 1
+
+echo "Push the tags to the master branch"
+git push github master --tags || exit 1
diff --git a/git-hg/add-branch.sh b/git-hg/add-branch.sh
new file mode 100755
index 000000000..053efd82f
--- /dev/null
+++ b/git-hg/add-branch.sh
@@ -0,0 +1,81 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+set -euo pipefail
+
+echo "Common defs"
+
+# shellcheck disable=SC1091
+source import-common.sh
+
+echo "Enter hg"
+
+cd hg || exit 1
+
+bpath=$1
+
+echo "Create $bpath"
+
+mkdir -p "$bpath" || exit 1
+
+echo "Clone $bpath (root)"
+git hg clone "http://hg.openjdk.java.net/$bpath" "$bpath/root" || exit 1
+
+# shellcheck disable=SC2154
+for module in "${modules[@]}"
+do
+    echo "Clone $bpath -> $module"
+    git hg clone "http://hg.openjdk.java.net/$bpath/$module" "$bpath/$module" || exit 1
+done
+
+echo "Exit hg"
+echo "Enter combined"
+
+cd ../combined || exit 1
+
+echo "Branch $bpath"
+
+pwd
+
+git checkout -b master || exit 1
+
+echo "Add remote for (root)"
+
+git remote add "imports/$bpath/root" "../hg/$bpath/root" || exit 1
+
+echo "Fetch (root)"
+
+git fetch "imports/$bpath/root" || exit 1
+
+echo "Merge (root)"
+
+git merge "imports/$bpath/root/master" -m "Initial merge of (root)" || exit 1
+
+# shellcheck disable=SC2154
+for module in "${modules[@]}"
+do
+    echo "Add remote for '$module'"
+    git remote add "imports/$bpath/$module" "../hg/$bpath/$module" || exit 1
+
+    echo "Fetch '$module'"
+    git fetch "imports/$bpath/$module" || exit 1
+
+    echo "Merge '$module'"
+    git subtree add --prefix="$module" "imports/$bpath/$module/master" -m "Initial merge of '$module'" || exit 1
+done
+
+echo "Push"
+
+git push github master --tags || exit 1
diff --git a/git-hg/diff-without-getsource.sh b/git-hg/diff-without-getsource.sh
index 6b46cd47b..882b1fdde 100755
--- a/git-hg/diff-without-getsource.sh
+++ b/git-hg/diff-without-getsource.sh
@@ -13,77 +13,42 @@
 # limitations under the License.
 #
 
-################################################################################
-# diff-without-getsource
-#
-# For finding the diff between an AdoptOpenJDK Git repo and the OpenJDK Mercurial
-# Repo for Java versions >= jdk10
-#
-# 1. Clones the AdoptOpenJDK Git repo for a particular version
-# 2. Clones the OpenJDK Mercurial repo for that same version
-# 3. Runs a diff between the two
-#
-################################################################################
-
 set -euo pipefail
 
-function checkArgs() {
-  if [ $# -lt 2 ]; then
-     echo Usage: "$0" '[AdoptOpenJDK Git Repo Version] [OpenJDK Mercurial Root Forest] [OpenJDK Mercurial Version]'
-     echo ""
-     echo "e.g. ./diff-without-getsource.sh jdk10u jdk-updates jdk10u"
-     echo ""
-     exit 1
-  fi
-}
-
-checkArgs $@
-
 git_repo_version=$1
-hg_root_forest=$2
-hg_repo_version=$3
-
-function cleanUp() {
-  rm -rf openjdk-git openjdk-hg
-}
+hg_root_forest=${2:-${1}}                  # for backwards compatibility
+hg_repo_version=${3:-${hg_root_forest}}    # for backwards compatibility
 
-function cloneRepos() {
-  echo "AdoptOpenJDK Git Repo Version: ${git_repo_version}"
-  echo "OpenJDK Mercurial Repo Version: ${hg_root_forest}/${hg_repo_version}"
+#cleanup
+rm -rf openjdk-git openjdk-hg
 
-  git clone -b master "https://github.com/AdoptOpenJDK/openjdk-${git_repo_version}.git" openjdk-git || exit 1
-  hg clone "http://hg.openjdk.java.net/${hg_root_forest}/${hg_repo_version}" openjdk-hg || exit 1
-}
+echo "git repo version: ${git_repo_version}"
+echo "hg repo version: ${hg_root_forest}/${hg_repo_version}"
 
-function runDiff() {
-  diffNum=$(diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' | wc -l)
+git clone -b master "https://github.com/AdoptOpenJDK/openjdk-${git_repo_version}.git" openjdk-git || exit 1
+hg clone "http://hg.openjdk.java.net/${hg_root_forest}/${hg_repo_version}" openjdk-hg || exit 1
 
-  if [ "$diffNum" -gt 0 ]; then
-    echo "ERROR - THE DIFF HAS DETECTED UNKNOWN FILES"
-    diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' | grep 'only in' || exit 1
-    exit 1
-  fi
-}
+diffNum=$(diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' | wc -l)
 
-function checkTags() {
+if [ "$diffNum" -gt 0 ]; then
+  echo "ERROR - THE DIFF HAS DETECTED UNKNOWN FILES"
+  diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' | grep 'only in' || exit 1
+  exit 1
+fi
 
-  cd openjdk-git || exit 1
-  gitTag=$(git describe --tags "$(git rev-list --tags --max-count=1)") || exit 1
-  cd - || exit 1
+# get latest git tag
 
-  cd openjdk-hg || exit 1
-  hgTag=$(hg log -r "." --template "{latesttag}\n") || exit 1
-  cd - || exit 1
+cd openjdk-git || exit 1
+gitTag=$(git describe --tags "$(git rev-list --tags --max-count=1)") || exit 1
+cd - || exit 1
 
-  if [ "$gitTag" == "$hgTag" ]; then
-    echo "Tags are in sync"
-  else
-    echo "ERROR - THE TAGS ARE NOT IN SYNC"
-    exit 1
-  fi
-}
+cd openjdk-hg || exit 1
+hgTag=$(hg log -r "." --template "{latesttag}\n") || exit 1
+cd - || exit 1
 
-cleanUp
-cloneRepos
-runDiff
-checkTags
+if [ "$gitTag" == "$hgTag" ]; then
+  echo "Tags are in sync"
+else
+  echo "ERROR - THE TAGS ARE NOT IN SYNC"
+  exit 1
+fi
diff --git a/git-hg/diff.sh b/git-hg/diff.sh
index 34afa8705..af198691c 100755
--- a/git-hg/diff.sh
+++ b/git-hg/diff.sh
@@ -13,93 +13,46 @@
 # limitations under the License.
 #
 
-################################################################################
-# diff
-#
-# For finding the diff between an AdoptOpenJDK Git repo and the OpenJDK Mercurial
-# Repo for Java versions <= jdk9u
-#
-# 1. Clones the AdoptOpenJDK Git repo for a particular version
-# 2. Clones the OpenJDK Mercurial repo for that same version
-# 3. Runs a diff between the two
-#
-################################################################################
-
-set -euo
-
-function checkArgs() {
-  if [ $# -lt 2 ]; then
-     echo Usage: "$0" '[AdoptOpenJDK Git Repo Version] [OpenJDK Mercurial Root Forest Version]'
-     echo ""
-     echo "e.g. ./diff.sh jdk8u jdk8u jdk8u or ./diff.sh jdk9u jdk-updates jdk9u"
-     echo ""
-     exit 1
-  fi
-}
-
-checkArgs $@
+set -euo pipefail
 
 git_repo_version=$1
 hg_root_forest=${2:-${1}}                  # for backwards compatibility
 hg_repo_version=${3:-${hg_root_forest}}    # for backwards compatibility
 
-function cleanUp() {
-  rm -rf openjdk-git openjdk-hg
-}
-
-function cloneRepos() {
-  echo "AdoptOpenJDK Git Repo Version: ${git_repo_version}"
-  echo "OpenJDK Mercurial Repo Version: ${hg_root_forest}/${hg_repo_version}"
-
-  git clone -b master "https://github.com/AdoptOpenJDK/openjdk-${git_repo_version}.git" openjdk-git || exit 1
-  hg clone "http://hg.openjdk.java.net/${hg_root_forest}/${hg_repo_version}" openjdk-hg || exit 1
-}
-
-function updateMercurialClone() {
-  cd openjdk-hg || exit 1
+#cleanup
+rm -rf openjdk-git openjdk-hg
 
-  chmod u+x get_source.sh
-  ./get_source.sh
+echo "git repo version: ${git_repo_version}"
+echo "hg repo version: ${hg_root_forest}/${hg_repo_version}"
 
-  cd - || exit 1
-}
+git clone -b master "https://github.com/AdoptOpenJDK/openjdk-${git_repo_version}.git" openjdk-git || exit 1
+hg clone "http://hg.openjdk.java.net/${hg_root_forest}/${hg_repo_version}" openjdk-hg || exit 1
 
-function runDiff() {
-  diffNum=$(diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' -x '.hgignore' -x 'get_source.sh' -x 'README.md' | wc -l)
+cd openjdk-hg || exit 1
+bash get_source.sh
+cd - || exit 1
 
-  if [ "$diffNum" -gt 0 ]; then
-    echo "ERROR - THE DIFF HAS DETECTED UNKNOWN FILES"
-    diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' -x '.hgignore' -x 'get_source.sh' -x 'README.md' | grep 'Only in' || exit 1
-    exit 1
-  fi
-}
+diffNum=$(diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' | wc -l)
 
-# This function only checks the latest tag, a future enhancement could be to
-# check all tags
-function checkLatestTag() {
+if [ "$diffNum" -gt 0 ]; then
+  echo "ERROR - THE DIFF HAS DETECTED UNKNOWN FILES"
+  diff -rq openjdk-git openjdk-hg -x '.git' -x '.hg' -x '.hgtags' | grep 'only in' || exit 1
+  exit 1
+fi
 
-  cd openjdk-git || exit 1
-  gitTag=$(git describe --abbrev=0 --tags) || exit 1
-  cd - || exit 1
+# get latest git tag
 
-  cd openjdk-hg || exit 1
-  hgTag=$(hg log -r "." --template "{latesttag}\n") || exit 1
-  cd - || exit 1
+cd openjdk-git || exit 1
+gitTag=$(git describe --abbrev=0 --tags) || exit 1
+cd - || exit 1
 
-  if [ "$gitTag" == "$hgTag" ]; then
-    echo "Latest Tags are in sync"
-  else
-    echo "ERROR - Git tag ${gitTag} is not equal to Hg tag ${hgTag}"
-    exit 1
-  fi
-}
+cd openjdk-hg || exit 1
+hgTag=$(hg log -r "." --template "{latesttag}\n") || exit 1
+cd - || exit 1
 
-cleanUp
-cloneRepos
-updateMercurialClone
-runDiff
-# No longer run the tag checking as we're only pulling in selective tags for
-# AdoptOpenJDK.  For others using this script (who are pulling in ALL of the
-# tags) you may wish to reenable this function and even enhance it to compare
-# all tags.
-#checkLatestTag
+if [ "$gitTag" == "$hgTag" ]; then
+  echo "Tags are in sync"
+else
+  echo "ERROR - THE TAGS ARE NOT IN SYNC"
+  exit 1
+fi
diff --git a/git-hg/import-common.sh b/git-hg/import-common.sh
index fc0db3407..bb05f0611 100755
--- a/git-hg/import-common.sh
+++ b/git-hg/import-common.sh
@@ -29,10 +29,7 @@ function checkGitVersion() {
   GIT_MAJOR_VERSION=$(echo "$GIT_VERSION" | cut -d. -f1)
   GIT_MINOR_VERSION=$(echo "$GIT_VERSION" | cut -d. -f2)
   [ "$GIT_MAJOR_VERSION" -eq 1 ] && echo I need git version 2.16 or later and you have "$GIT_VERSION" && exit 1
-  if [ "$GIT_MAJOR_VERSION" -eq 2 ] && [ "$GIT_MINOR_VERSION" -lt 16 ] ; then
-    echo I need git version 2.16 or later and you have "$GIT_VERSION"
-    exit 1
-  fi
+  [ "$GIT_MAJOR_VERSION" -eq 2 ] && [ "$GIT_MINOR_VERSION" -lt 16 ] && echo I need git version 2.16 or later and you have "$GIT_VERSION" && exit 1
 }
 
 function installGitRemoteHg() {
@@ -41,7 +38,7 @@ function installGitRemoteHg() {
     echo "Getting it from https://raw.githubusercontent.com/felipec/git-remote-hg/master/git-remote-hg"
     mkdir -p "$WORKSPACE/bin"
     PATH="$PATH:$WORKSPACE/bin"
-    wget -O "$WORKSPACE/bin/git-remote-hg" "https://raw.githubusercontent.com/felipec/git-remote-hg/master/git-remote-hg"
+    wget -O "$WORKSPACE/bin/git-remote-hg https://raw.githubusercontent.com/felipec/git-remote-hg/master/git-remote-hg"
     chmod ugo+x "$WORKSPACE/bin/git-remote-hg"
     if ! which git-remote-hg 2>/dev/null; then
       echo "Still cannot find it, exiting.."
@@ -49,12 +46,3 @@ function installGitRemoteHg() {
     fi
   fi
 }
-
-# Merge master into dev as we build off dev at the AdoptOpenJDK Build farm
-# dev contains patches that AdoptOpenJDK has beyond upstream OpenJDK
-function performMergeIntoDevFromMaster() {
-  git checkout dev || git checkout -b dev
-  git rebase master || exit 1
-  git push origin dev || exit 1
-}
-
diff --git a/git-hg/mercurialToGitWithSubModules.sh b/git-hg/mercurialToGitWithSubModules.sh
deleted file mode 100755
index 3f7cf7ff8..000000000
--- a/git-hg/mercurialToGitWithSubModules.sh
+++ /dev/null
@@ -1,430 +0,0 @@
-#!/bin/bash
-#
-# ===========================================================================
-# (c) Copyright IBM Corp. 2018 All Rights Reserved
-# ===========================================================================
-#
-# This code is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License version 2 only, as
-# published by the Free Software Foundation.
-#
-# This code is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-# version 2 for more details (a copy is included in the LICENSE file that
-# accompanied this code).
-#
-# You should have received a copy of the GNU General Public License version
-# 2 along with this work; if not, see <http://www.gnu.org/licenses/>.
-#
-# ===========================================================================
-
-################################################################################
-# mercurialToGitWithSubModules
-#
-# Create a Git clone of a OpenJDK mercurial repository for Java 8/9 complete
-# with tags and commit history.
-#
-# There are three repos involved in the overall operation
-#
-# REPO_LOCATION     - workspace/adoptopenjdk-clone/      - copy of upstream github repo where new commits will end up
-# MIRROR            - workspace/openjdk-clean-mirror     - Unmodified clones of openjdk mercurial (basically a local cache)
-# REWRITE_WORKSPACE - workspace/openjdk-rewritten-mirror - Workspace where mercurial is manipulated before being written into the upstream
-#                   - workspace/bin                      - Helper third party programs
-#
-# The overall technique used is to:
-#
-# 1. Setup what tags and modules we want to clone
-# 2. Check / Download some tooling we need
-# 3. Git clone the remote upstream where we eventually want to push REPO_LOCATION
-# 4. Clone / Update $MIRROR
-# 5. Rewrite git commits from the $MIRROR into $REWRITE_WORKSPACE which takes
-#    care of things like prefixing the module name for sub forests.
-# 6  Merge the changes in $REWRITE_WORKSPACE into $REPO_LOCATION
-# 7. Push that merged result back to the remote upstream of REPO_LOCATION
-#
-# WARN: Please do not make changes to this script without discussing on the
-# build channel on the AdoptOpenJDK Slack.
-#
-# TODO: Due to the interleaving of commits in mercurial for CPU and PSU updates
-# e.g. jdk8u151+b12 and jdk152+b16 this script does not gracefully handle
-# merging in both.  We recommend following a CPU or PSU strategy only.
-#
-################################################################################
-
-set -euxo
-
-# Set up the workspace to work from
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-mkdir -p $SCRIPT_DIR/workspace
-WORKSPACE=$SCRIPT_DIR/workspace
-
-# REPO_LOCATION     - workspace/adoptopenjdk-clone/      - copy of upstream github repo where new commits will end up
-# MIRROR            - workspace/openjdk-clean-mirror     - Unmodified clones of openjdk mercurial (basically a local cache)
-# REWRITE_WORKSPACE - workspace/openjdk-rewritten-mirror - Workspace where mercurial is manipulated before being written into the upstream
-#                   - workspace/bin                      - Helper third party programs
-MIRROR=$WORKSPACE/openjdk-clean-mirror
-REWRITE_WORKSPACE=$WORKSPACE/openjdk-rewritten-mirror/
-REPO_LOCATION=$WORKSPACE/adoptopenjdk-clone/
-
-# Setup workspace to work in.
-function setupWorkingDir() {
-  if [ -z ${DEBUG_SCRIPT+x} ]; then
-    rm -rf "$REWRITE_WORKSPACE"
-    mkdir -p "$REWRITE_WORKSPACE"
-  else
-    rm -rf "$REWRITE_WORKSPACE/root"
-    rm -rf "$REPO_LOCATION"
-  fi
-}
-
-setupWorkingDir
-
-echo "Import common functionality"
-# shellcheck disable=SC1091
-source import-common.sh
-
-function checkArgs() {
-  if [ $# -lt 3 ]; then
-     echo Usage: "$0" '[jdk8u|jdk9u] [TARGET_PROJECT] [TARGET_REPO] (TAGS)'
-     echo ""
-     echo "e.g. ./mercurialToGitWithSubModules.sh jdk8u git@github.com:AdoptOpenJDK openjdk-jdk8u jdk8u172-b11 jdk8u181-b13 HEAD"
-     echo ""
-     exit 1
-  fi
-  if [ -z "$WORKSPACE" ] || [ ! -d "$WORKSPACE" ] ; then
-    echo Cannot access \$WORKSPACE: "$WORKSPACE"
-    exit 2
-  fi
-}
-
-checkArgs $@
-
-# These the the modules in the mercurial forest that we'll have to iterate over
-MODULES=(corba langtools jaxp jaxws nashorn jdk hotspot)
-
-# OpenJDK version that we're wanting to mirror, e.g. jdk8u or jdk9u
-OPENJDK_VERSION="$1"
-shift
-
-# Get the target project, e.g. git@github.com:AdoptOpenJDK
-TARGET_PROJECT="$1"
-shift
-
-# Get the target repo, e.g. "openjdk-jdk8u"
-TARGET_REPO="$1"
-shift
-
-# Get a list of optional tags
-TAGS="$@"
-
-function setMercurialRepoAndTagsToRetrieve() {
-  case "$OPENJDK_VERSION" in
-     jdk8*) HG_REPO=http://hg.openjdk.java.net/jdk8u/jdk8u
-            # Would be nice to pull out the tags in an automated fashion, but
-            # OpenJDK does not provide this yet. HEAD is interpreted by the
-            # script below to mean tip/latest commit.
-            # Skipping jdk8u152-b16 as it seems to be problematic
-            if [ -z "$TAGS" ] ; then
-                TAGS="jdk8u144-b34 jdk8u162-b12 jdk8u172-b11 jdk8u181-b13 HEAD"
-            fi;;
-     jdk9*) HG_REPO=http://hg.openjdk.java.net/jdk-updates/jdk9u
-
-            if [ -z "$TAGS" ] ; then
-                TAGS="jdk-9+181 jdk-9.0.1+11 jdk-9.0.3+9 jdk-9.0.4+11 HEAD"
-            fi;;
-         *) Unknown JDK version - only jdk8u and jdk9u are supported; exit 1;;
-  esac
-}
-
-# Clone current Git repo
-function cloneGitOpenJDKRepo() {
-  echo "Clone current $TARGET_REPO"
-  if [ ! -d "$REPO_LOCATION" ] ; then
-    mkdir -p "$REPO_LOCATION"
-    cd "$REPO_LOCATION"
-    git clone "$TARGET_PROJECT/$TARGET_REPO.git" .
-    cd "$REPO_LOCATION" || exit 1;
-  else
-    cd "$REPO_LOCATION"
-    git fetch origin
-    git reset --hard origin/master
-  fi
-
-  commitCount=$(git rev-list --all --count)
-  if [ "$commitCount" == 0 ]; then
-    git checkout -b master
-    touch README.md
-    git add README.md
-    git commit -a -m "Initial commit"
-    git push --set-upstream origin master
-  fi
-
-  git checkout master
-  git pull --allow-unrelated-histories origin master
-  git fetch --tags
-  local oldtag=$(git describe --abbrev=0 --tags)
-  echo "Current openjdk level is $oldtag"
-}
-
-function updateRepo() {
-  repoName=$1
-  repoLocation=$2
-
-  if [ ! -d "$MIRROR/$repoName/.git" ]; then
-    rm -rf "$MIRROR/$repoName" || exit 1
-    mkdir -p "$MIRROR/$repoName" || exit 1
-    cd "$MIRROR/$repoName"
-    git clone "hg::${repoLocation}" .
-  fi
-
-  cd "$MIRROR/$repoName"
-  git fetch origin
-  git pull origin
-  git reset --hard origin/master
-  git fetch --all
-
-}
-
-TMP_WORKSPACE="/tmp/adopt-tmp/"
-
-cleanup () {
-  exit_code=$?
-  if [ -d "$TMP_WORKSPACE" ]; then
-    rm -rf "$TMP_WORKSPACE" || true
-  fi
-
-  if [ -d "/dev/shm/adopt/" ]; then
-    rm -rf "/dev/shm/adopt/" || true
-  fi
-  exit $exit_code
-}
-
-function updateMirrors() {
-  mkdir -p "$MIRROR"
-  cd "$MIRROR" || exit 1
-
-  updateRepo "root" "${HG_REPO}"
-
-  for module in "${MODULES[@]}" ; do
-      updateRepo "$module" "${HG_REPO}/$module"
-  done
-
-  rewriteMirror
-}
-
-function rewriteMirror() {
-  # If running locally on Mac OS X then use availableMemory=400
-  availableMemory=$(free -mw | grep Mem | egrep -o "[0-9]+$")
-
-  trap cleanup EXIT ERR INT TERM
-
-  if [[ $availableMemory -gt 500 ]]; then
-    echo "Detected more than 500mb of ram available, attempting to use ram dist to speed up"
-    TMP_WORKSPACE="/dev/shm/adopt/"
-  else
-    TMP_WORKSPACE="/tmp/adopt-tmp/"
-    rm -rf "$TMP_WORKSPACE" || true
-  fi
-
-  mkdir -p "$TMP_WORKSPACE" || exit 1
-
-  for module in "${MODULES[@]}" ; do
-    needsUpdate=$(doesModuleNeedUpdate "$module")
-
-    # dont rewrite mirror if HEAD in mirror is already merged in
-    if [ "$needsUpdate" == "true" ]; then
-
-      mkdir -p "$REWRITE_WORKSPACE/$module"
-      cd "$REWRITE_WORKSPACE/$module" || exit 1
-
-      # Clone the sub module
-      echo "$(date +%T)": "Clone $module"
-      git clone "$MIRROR/$module" . || exit 1
-
-      # Get to to the tag that we want
-      git fetch --tags
-
-      echo "$(date +%T)": "GIT filter on $module"
-      mkdir "$TMP_WORKSPACE/$module"
-      git reset --hard master
-
-      # This looks a bit odd but trust us, take all files and prepend $module to them
-      prefix_module_sed="s|$(printf '\t')\\\"*|&$module/|"
-      git filter-branch -d "$TMP_WORKSPACE/$module" -f --index-filter "git rm -f -q --cached --ignore-unmatch .hgignore .hgtags && git ls-files -s | sed \"$prefix_module_sed\" | GIT_INDEX_FILE=\$GIT_INDEX_FILE.new git update-index --index-info && mv \"\$GIT_INDEX_FILE.new\" \"\$GIT_INDEX_FILE\"" --prune-empty --tag-name-filter cat -- --all
-
-      rm -rf "$TMP_WORKSPACE/$module" || exit 1
-    fi
-  done
-
-  rm -rf "$TMP_WORKSPACE" || exit 1
-}
-
-function checkoutRoot() {
-  # If we haven't already mirrored the $OPENJDK_VERSION then git clone
-  if [ ! -d "$REWRITE_WORKSPACE/root/.git" ] ; then
-    rm -rf "$REWRITE_WORKSPACE/root" || true
-    mkdir "$REWRITE_WORKSPACE/root"
-    cd "$REWRITE_WORKSPACE/root"
-    git clone "$MIRROR/root" .
-    git remote set-url origin "file://$MIRROR/root"
-  fi
-
-  # Move into the $OPENJDK_VERSION and make sure we're on the latest master
-  cd "$REWRITE_WORKSPACE/root" || exit 1
-  git pull
-  git fetch --all
-  git reset --hard origin/master
-
-  # Remove certain Mercurial specific files from history
-  (git filter-branch -f --index-filter 'git rm -r -f -q --cached --ignore-unmatch .hg .hgignore .hgtags get_source.sh' --prune-empty --tag-name-filter cat -- --all)
-
-}
-
-function fetchRootTagIntoRepo() {
-  NEWTAG=$1
-
-  cd "$REWRITE_WORKSPACE/root" || exit 1
-  git reset --hard "$NEWTAG"
-
-  echo "$(date +%T)": "Updating master branch for $NEWTAG"
-  cd "$REPO_LOCATION" || exit 1
-  git branch --unset-upstream || true
-  git checkout master
-  git fetch "$REWRITE_WORKSPACE/root"
-  git merge --allow-unrelated-histories -m "Merge base $NEWTAG" FETCH_HEAD
-}
-
-
-function fetchModuleTagIntoRepo() {
-  NEWTAG=$1
-  module=$2
-
-  needsUpdate=$(doesModuleNeedUpdate "$module")
-
-  if [ "$needsUpdate" == "true" ]; then
-    cd "$REWRITE_WORKSPACE/$module"
-    newCommitId=$(git rev-list -n 1 "$NEWTAG")
-
-    cd "$MIRROR/$module"
-    originalCommitId=$(git rev-list -n 1 "$NEWTAG")
-
-    cd "$REPO_LOCATION" || exit 1
-
-    if [ "$NEWTAG" == "HEAD" ]
-    then
-      git fetch "$REWRITE_WORKSPACE/$module" master
-    else
-      git fetch "$REWRITE_WORKSPACE/$module" "refs/tags/$NEWTAG"
-    fi
-
-    echo "$(date +%T)": GIT merge of "$module"
-    if ! git merge --allow-unrelated-histories -m "Merge module $module at $NEWTAG. OriginalCommitId: $originalCommitId NewCommitId: $newCommitId" FETCH_HEAD; then
-      if ! tty; then
-        echo "Aborting - not running on a real tty therefore cannot allow manual intervention"
-        exit 10
-      else
-        echo "Please resolve them in another window then press return to continue"
-        read -r _
-      fi
-      echo Please resolve the conflicts above in "$REPO_LOCATION", and press return to continue
-      read -r _
-    fi
-  fi
-}
-
-function pushTagToMaster() {
-
-  NEWTAG=$1
-
-  cd "$REPO_LOCATION" || exit 1
-  git reset --hard master
-  git push origin master
-
-  echo "Pulling in changes to $TARGET_REPO branch"
-
-  # Grab anything that someone else may have pushed to the remote
-  git fetch origin master
-  if ! git merge --allow-unrelated-histories -m "Merge $NEWTAG into $TARGET_REPO" FETCH_HEAD; then
-    echo Conflict resolution needed in "$REPO_LOCATION"
-    if ! tty; then
-      echo "Aborting - not running on a real tty therefore cannot allow manual intervention"
-      exit 10
-    else
-      echo "Please resolve them in another window then press return to continue"
-      read -r _
-    fi
-  fi
-
-  if [ "$NEWTAG" != "HEAD" ] ; then
-    echo "Override existing tag on the tag from the server if it is present or push will fail"
-    git tag -f -a "$NEWTAG" -m "Merge $NEWTAG into master"
-  fi
-
-  if [ "$NEWTAG" != "HEAD" ] ; then
-    git push origin :refs/tags/"$NEWTAG"
-  fi
-
-  if [ "$NEWTAG" == "HEAD" ] ; then
-    git push origin master
-  fi
-
-  if [ "$NEWTAG" != "HEAD" ] ; then
-    git push origin master --tags
-  fi
-}
-
-function doesModuleNeedUpdate() {
-  module=$1
-
-  cd "$MIRROR/$module"
-  latestCommitInMirror=$(git rev-list -n 1 HEAD)
-
-  cd "$REPO_LOCATION"
-
-  # Merge module $module at $NEWTAG. OriginalCommitId: $originalCommitId NewCommitId: $newCommitId, tr -d is for Mac OS X
-  mergeCount=$(git log --all --pretty=format:"%H\n" --grep="Merge module $module at.*OriginalCommitId: $latestCommitInMirror" | wc -w | tr -d " ")
-
-  if [ "$mergeCount" == 0 ]; then
-    echo "true"
-  else
-    echo "false"
-  fi
-}
-
-function cloneMercurialOpenJDKRepo() {
-
-  if [ -z ${DEBUG_SCRIPT+x} ]; then
-    updateMirrors
-  fi
-
-  cd "$REWRITE_WORKSPACE" || exit 1
-  checkoutRoot
-
-  for NEWTAG in $TAGS ; do
-
-    cd "$REPO_LOCATION" || exit 1
-
-    if git tag | grep "^$NEWTAG$" ; then
-      echo "Skipping $NEWTAG as it already exists"
-    else
-      fetchRootTagIntoRepo "$NEWTAG"
-
-      # For each module
-      for module in "${MODULES[@]}" ; do
-        fetchModuleTagIntoRepo "$NEWTAG" "$module"
-      done
-      pushTagToMaster "$NEWTAG"
-    fi
-  done
-
-
-
-}
-
-setMercurialRepoAndTagsToRetrieve
-checkGitVersion
-installGitRemoteHg
-cloneGitOpenJDKRepo
-cloneMercurialOpenJDKRepo
-performMergeIntoDevFromMaster
diff --git a/git-hg/mercurialToGit.sh b/git-hg/mirrorMercurialIntoGit.sh
similarity index 91%
rename from git-hg/mercurialToGit.sh
rename to git-hg/mirrorMercurialIntoGit.sh
index c0e060faf..91220990c 100755
--- a/git-hg/mercurialToGit.sh
+++ b/git-hg/mirrorMercurialIntoGit.sh
@@ -83,6 +83,14 @@ function performMergeFromMercurialIntoGit() {
   git push origin "$BRANCH" --tags || exit 1
 }
 
+# Merge master into dev as we build off dev at the AdoptOpenJDK Build farm
+# dev contains patches that AdoptOpenJDK has beyond upstream OpenJDK
+function performMergeIntoDevFromMaster() {
+  git checkout dev || git checkout -b dev
+  git rebase master || exit 1
+  git push origin dev || exit 1
+}
+
 # TODO Need to cover always merging mercurial master into our GitHub dev branch
 checkArgs $#
 #checkGitVersion
diff --git a/git-hg/setup.sh b/git-hg/setup.sh
new file mode 100755
index 000000000..c133aa725
--- /dev/null
+++ b/git-hg/setup.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+set -euo pipefail
+rm -rf "$WORKSPACE/combined" "$WORKSPACE/hg"
+mkdir "$WORKSPACE/combined"
+mkdir "$WORKSPACE/hg"
+cd "$WORKSPACE/combined" || exit 1
+git init
+git checkout -b root-commit || exit 1
+git remote add github git@github.com:AdoptOpenJDK/openjdk-"${1}".git
+cd - || exit 1
+bash add-branch-without-modules.sh "${2:-jdk/jdk}"
diff --git a/git-hg/setup8.sh b/git-hg/setup8.sh
new file mode 100755
index 000000000..7d5f08e80
--- /dev/null
+++ b/git-hg/setup8.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+set -euo pipefail
+rm -rf "$WORKSPACE/combined" "$WORKSPACE/hg"
+mkdir "$WORKSPACE/combined"
+mkdir "$WORKSPACE/hg"
+cd "$WORKSPACE/combined" || exit 1
+git init
+git checkout -b root-commit || exit 1
+git remote add github git@github.com:AdoptOpenJDK/openjdk-jdk8u.git || exit 1
+cd - || exit 1
+bash add-branch.sh jdk8u/jdk8u
diff --git a/git-hg/setup9.sh b/git-hg/setup9.sh
new file mode 100755
index 000000000..068a7e96e
--- /dev/null
+++ b/git-hg/setup9.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+set -euo pipefail
+rm -rf "$WORKSPACE/combined" "$WORKSPACE/hg"
+mkdir "$WORKSPACE/combined"
+mkdir "$WORKSPACE/hg"
+cd "$WORKSPACE/combined" || exit 1
+git init
+git checkout -b root-commit || exit 1
+git remote add github git@github.com:AdoptOpenJDK/openjdk-jdk9.git
+cd - || exit 1
+bash add-branch.sh jdk9/jdk9
diff --git a/git-hg/setupAmber.sh b/git-hg/setupAmber.sh
new file mode 100644
index 000000000..50207133b
--- /dev/null
+++ b/git-hg/setupAmber.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+set -euo pipefail
+rm -rf "$WORKSPACE/combined" "$WORKSPACE/hg"
+mkdir "$WORKSPACE/combined"
+mkdir "$WORKSPACE/hg"
+cd "$WORKSPACE/combined" || exit 1
+git init
+git checkout -b root-commit || exit 1
+git remote add github git@github.com:AdoptOpenJDK/openjdk-amber.git
+cd - || exit 1
+bash add-branch-without-modules.sh amber/amber raw-string-literal
diff --git a/git-hg/update-without-modules.sh b/git-hg/update-without-modules.sh
new file mode 100755
index 000000000..d335540e1
--- /dev/null
+++ b/git-hg/update-without-modules.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+
+echo "Import common functionality"
+# shellcheck disable=SC1091
+source import-common.sh
+
+echo "Enter hg"
+cd hg || exit 1
+
+# shellcheck disable=SC2035
+bpaths=${1:-$(ls -d -1 */*)}     # maintain backward compatibility
+
+for bpath in $bpaths
+do
+    bpathAsArray=(${bpath/\// })       # for e.g. jdk10/jdk10 or jdk/jdk or openjfx/jfx-dev/rt, becomes:
+    hg_root_forest=${bpathAsArray[0]}  #          jdk10 or jdk or openjfx
+    hg_repo=${bpathAsArray[1]}         #          jdk10 or jdk or jfx-dev/rt
+
+    pushd "$hg_root_forest/$hg_repo/root"
+    echo "Update $hg_root_forest/$hg_repo -> (root)"
+    git hg fetch "http://hg.openjdk.java.net/$hg_root_forest/$hg_repo"
+    git hg pull "http://hg.openjdk.java.net/$hg_root_forest/$hg_repo"
+    popd
+
+    echo "Exit hg"
+
+    echo "Enter ../combined"
+    cd ../combined || exit 1
+
+    echo "Check out master"
+    git checkout master || exit 1
+
+    echo "Fetch (root) of the mercurial forest/repo"
+    git fetch "imports/$hg_root_forest/$hg_repo/root" || exit 1
+
+    echo "Merge (root)"
+    git merge "imports/$hg_root_forest/$hg_repo/root/master" -m "Merge from (root)" --no-ff || exit 1
+
+    echo "Push to GitHub"
+    git push github master --tags
+
+    echo "Exit back to ../hg"
+    cd ../hg || exit 1
+done
diff --git a/git-hg/updateforesttags.sh b/git-hg/updateforesttags.sh
new file mode 100755
index 000000000..1e4daded4
--- /dev/null
+++ b/git-hg/updateforesttags.sh
@@ -0,0 +1,151 @@
+#!/bin/bash
+#
+# ===========================================================================
+# (c) Copyright IBM Corp. 2018 All Rights Reserved
+# ===========================================================================
+#
+# This code is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, see <http://www.gnu.org/licenses/>.
+#
+# ===========================================================================
+
+if [ $# -lt 1 ]; then
+   echo Usage: "$0" '[jdk8u|jdk9] (TAGS)'
+   echo "Version supplied should match a repository in AdoptOpenJDK/openjdk-VERSION"
+   exit 1
+fi
+[ -z "$WORKSPACE" ] || [ ! -d "$WORKSPACE" ] && echo Cannot access \$WORKSPACE: "$WORKSPACE" && exit 2
+
+MODULES=(corba langtools jaxp jaxws nashorn jdk hotspot)
+
+OPENJDK_VERSION="$1"
+shift
+# shellcheck disable=SC2124
+TAGS="$@"
+GITHUB_PROJECT=git@github.com:AdoptOpenJDK
+GITHUB_REPO="openjdk-$OPENJDK_VERSION"
+
+case "$OPENJDK_VERSION" in
+   jdk8*) HG_REPO=http://hg.openjdk.java.net/jdk8u/jdk8u
+          [ -z "$TAGS" ] && TAGS="jdk8u144-b34 jdk8u151-b12 jdk8u152-b16 jdk8u161-b12 jdk8u162-b12 jdk8u172-b03 jdk8u172-b11";;
+   jdk9*) HG_REPO=http://hg.openjdk.java.net/jdk-updates/jdk9u
+          [ -z "$TAGS" ] && TAGS="jdk-9+181 jdk-9.0.1+11 jdk-9.0.3+9 jdk-9.0.4+11";;
+       *) Unknown JDK version - only jdk8u and jdk9 are supported; exit 1;;
+esac
+
+# Clean up
+rm    -rf "${WORKSPACE:?}/$GITHUB_REPO" "${WORKSPACE:?}/openjdk"
+mkdir -p  "$WORKSPACE/$GITHUB_REPO" "$WORKSPACE/openjdk/mirror"
+
+git --version || exit 1
+GIT_VERSION=$(git --version | awk '{print$NF}')
+GIT_MAJOR_VERSION=$(echo "$GIT_VERSION" | cut -d. -f1)
+GIT_MINOR_VERSION=$(echo "$GIT_VERSION" | cut -d. -f2)
+[ "$GIT_MAJOR_VERSION" -eq 1 ] && echo I need git version 2.16 or later and you have "$GIT_VERSION" && exit 1
+[ "$GIT_MAJOR_VERSION" -eq 2 ] && [ "$GIT_MINOR_VERSION" -lt 16 ] && echo I need git version 2.16 or later and you have "$GIT_VERSION" && exit 1
+
+if ! which git-remote-hg 2>/dev/null; then
+  echo "I need git-remote-hg and could not find it"
+  echo "Get it from http://raw.githubusercontent.com/felipec/git-remote-hg/master/git-remote-hg"
+  exit 1
+fi
+
+# Clone current AdoptOpenJDK repo
+cd "$WORKSPACE/$GITHUB_REPO" || exit 1
+echo "Clone current $GITHUB_REPO"
+git clone "$GITHUB_PROJECT/$GITHUB_REPO.git"
+cd "$GITHUB_REPO" || exit
+git fetch --tags
+OLDTAG=$(git describe --abbrev=0 --tags) 
+echo "Current openjdk level is $OLDTAG"
+
+# Clone current openjdk from Mercurial
+echo "Get base openjdk repository" 
+cd "$WORKSPACE/openjdk/mirror" || exit 1
+git init
+git clone --bare "hg::${HG_REPO}"
+
+cd "$OPENJDK_VERSION.git" || exit 1
+
+git filter-branch -f --index-filter 'git rm -r -f -q --cached --ignore-unmatch .hg .hgignore .hgtags get_source.sh' --prune-empty --tag-name-filter cat -- --all
+
+cd .. || exit
+git pull "$OPENJDK_VERSION"
+git fetch --tags "$OPENJDK_VERSION"
+for NEWTAG in $TAGS ; do
+  cd "$WORKSPACE/openjdk/mirror" || exit 1
+  git reset --hard "$NEWTAG"
+
+  echo "$(date +%T)": "Updating master branch for $NEWTAG"
+  cd "$WORKSPACE/$GITHUB_REPO/$GITHUB_REPO" || exit 1
+  git checkout master
+  git fetch "$WORKSPACE/openjdk/mirror"
+  git merge --allow-unrelated-histories -m "Merge base $NEWTAG" FETCH_HEAD
+
+  for module in "${MODULES[@]}"
+    do
+      if [ ! -d "$WORKSPACE/openjdk/$module" ]; then
+        rm -rf  "$WORKSPACE/openjdk/$module"
+        mkdir   "$WORKSPACE/openjdk/$module"
+        cd "$WORKSPACE/openjdk/$module" || exit 1
+        git init
+        echo "$(date +%T)": "Clone $module"
+        git clone --bare "hg::${HG_REPO}/$module" || exit 1
+        echo "$(date +%T)": "GIT filter on $module"
+        cd "$module.git" || exit
+        git filter-branch -f --index-filter "git rm -f -q --cached --ignore-unmatch .hgignore .hgtags && git ls-files -s | sed \"s|\t\\\"*|&$module/|\" | GIT_INDEX_FILE=\$GIT_INDEX_FILE.new git update-index --index-info && mv \"\$GIT_INDEX_FILE.new\" \"\$GIT_INDEX_FILE\"" --prune-empty --tag-name-filter cat -- --all
+        cd .. || exit
+      fi
+      echo "$(date +%T)": "GIT pull/reset on $module at $NEWTAG"
+      cd "$WORKSPACE/openjdk/$module" || exit 1
+      git pull "$module"
+      git fetch --tags "$module"
+      git reset --hard "$NEWTAG"
+      cd "$WORKSPACE/$GITHUB_REPO/$GITHUB_REPO" || exit 1
+      git fetch "$WORKSPACE/openjdk/$module"
+      echo "$(date +%T)": GIT filter on "$module"
+      if ! git merge --allow-unrelated-histories -m "Merge $module at $NEWTAG" FETCH_HEAD; then
+        if ! tty; then
+          echo "Aborting - not running on a real tty therefore cannot allow manual intervention"
+          exit 10
+        else
+          echo "Please resolve them in another window then press return to continue"
+          read -r _
+        fi
+         echo Please resolve the conflicts above in "$WORKSPACE/$GITHUB_REPO/$GITHUB_REPO", and press return to continue
+         read -r _
+      fi
+    done
+  cd "$WORKSPACE/$GITHUB_REPO/$GITHUB_REPO" || exit 1
+  git push origin master
+  
+  echo "Pulling in changes to $GITHUB_REPO branch"
+  git checkout master
+  git fetch origin master
+  if ! git merge --allow-unrelated-histories -m "Merge $NEWTAG into $GITHUB_REPO" FETCH_HEAD; then
+    echo Conflict resolution needed in "$WORKSPACE/$GITHUB_REPO/$GITHUB_REPO"
+    if ! tty; then
+      echo "Aborting - not running on a real tty therefore cannot allow manual intervention"
+      exit 10
+    else
+      echo "Please resolve them in another window then press return to continue"
+      read -r _
+    fi
+  fi
+  [ "$NEWTAG" != "HEAD" ] && git tag -f -a "$NEWTAG" -m "Merge $NEWTAG into master"
+  echo Deleting the old version of the tag from the server if it is present or push will fail
+  # shellcheck disable=SC2015
+  [ "$NEWTAG" != "HEAD" ] && git push origin :refs/tags/"$NEWTAG" || true
+  [ "$NEWTAG" == "HEAD" ] && git push origin master
+  [ "$NEWTAG" != "HEAD" ] && git push origin master --tags
+done