diff --git a/precise/docker-builder/README b/precise/docker-builder/README
new file mode 100644
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--- /dev/null
+++ b/precise/docker-builder/README
@@ -0,0 +1,28 @@
+
+
+Unfinished because untested. But, the script docker-updater is
+tested and used.
+
+
+This LXC requires a kernel >3.8 at least. (to be able to run docker in
+LXC) It requires also "aufs" capabilities (apparmor.d permission, but
+also available in kernel)
+
+XXXvlab: we could run docker in LXC via a socket towards an host's
+install of docker and remove this constraint.
+
+
+It is meant to build image of applications based on a single git-sub
+code.
+
+It provides an IMAGE that does not requires 'git' tool, and won't
+contain any git history.
+
+Then, it'll be able to update this image by small "docker commits"
+quite efficiently.
+
+
+Currently the image produced can only be run on docker host that
+support running aufs in the containers (this implies, that the docker
+fs driver IS NOT aufs, that the host kernel support aufs, and that
+permissions are set so that container can mount an aufs filesystem).
diff --git a/precise/docker-builder/config b/precise/docker-builder/config
new file mode 100644
index 0000000..de6f698
--- /dev/null
+++ b/precise/docker-builder/config
@@ -0,0 +1 @@
+lxc.aa_profile = unconfined
diff --git a/precise/docker-builder/hooks/install b/precise/docker-builder/hooks/install
new file mode 100755
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--- /dev/null
+++ b/precise/docker-builder/hooks/install
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -eux # -x for verbose logging to juju debug-log
+
+##
+## add files
+##
+
+cp src/usr/local/sbin/* src/usr/local/sbin/
+
+## Could consider not using docker inside the LXC for compatibility
+## reason in this case you need to setup a --lts connection.  You can
+## use "DOCKER_MAIN_OPTS" to add this to every usage of docker one
+## 0k-docker is installed.
+
+## install 
+##  - 0k-docker for docker-build-charm
+ln -sf /opt/apps/0k-docker/bin/docker-build-charm /usr/local/sbin
+
+##  - 0k-charm for charms
+ln -sf /opt/apps/0k-charms/precise /srv/charm-store
+
+apt-get install python-pip  ## for 'pip install shyaml'
+pip install shyaml          ## for docker-build-charm
+
+apt-get install kal-shlib-pretty  ## for docker-build-charm
+
+
+
diff --git a/precise/docker-builder/hooks/start b/precise/docker-builder/hooks/start
new file mode 100755
index 0000000..9eb7853
--- /dev/null
+++ b/precise/docker-builder/hooks/start
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+juju-log "Nothing to Start for base."
diff --git a/precise/docker-builder/hooks/stop b/precise/docker-builder/hooks/stop
new file mode 100755
index 0000000..170162b
--- /dev/null
+++ b/precise/docker-builder/hooks/stop
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+juju-log "Nothing to stop for base."
diff --git a/precise/docker-builder/metadata.yaml b/precise/docker-builder/metadata.yaml
new file mode 100644
index 0000000..777584c
--- /dev/null
+++ b/precise/docker-builder/metadata.yaml
@@ -0,0 +1,11 @@
+name: docker-builder
+summary: "Docker Builder"
+maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
+inherit: docker
+description: |
+    Docker Builder
+data-resources:
+  - /var/lib/docker
+  - /srv/docker-updates
+config-resources:
+  - /etc/docker
diff --git a/precise/docker-builder/revision b/precise/docker-builder/revision
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/precise/docker-builder/revision
@@ -0,0 +1 @@
+0
diff --git a/precise/docker-builder/src/usr/lib/docker-updater/wrap-application b/precise/docker-builder/src/usr/lib/docker-updater/wrap-application
new file mode 100644
index 0000000..a51465a
--- /dev/null
+++ b/precise/docker-builder/src/usr/lib/docker-updater/wrap-application
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+orig=$0.diverted
+
+if [ -z "$APP_LOCATION" ]; then
+   echo "Error: APP_LOCATION was not defined."
+   exit 1
+fi
+
+app=/srv/app
+root=$app/root
+changes=$app/changes/0000
+mnt=$app/mnt
+
+## All these should be in the root image
+#mkdir -p $root $mnt
+#mkdir -p "$(dirname "$APP_LOCATION")"
+
+if [ -d "$changes" ]; then
+    clean_all() {
+        cd /
+        mountpoint "$mnt" 2>/dev/null && umount "$mnt"
+    }
+
+
+    trap "clean_all" EXIT
+    mount -t aufs -o br=$changes:$root -o udba=none  none "$mnt"
+    if [ "$?" != 0 ]; then
+        echo "Error: aufs mount failed."
+        exit 1
+    fi
+
+    ln -sf "$mnt" "$APP_LOCATION"
+else
+    ln -sf "$root" "$APP_LOCATION"
+fi
+
+"$orig" "$@"
diff --git a/precise/docker-builder/src/usr/local/bin/docker-build b/precise/docker-builder/src/usr/local/bin/docker-build
new file mode 100755
index 0000000..f6f0c93
--- /dev/null
+++ b/precise/docker-builder/src/usr/local/bin/docker-build
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+## Called by git-hooks or by hand, it should produce a master git-sub repository
+
+## it should:
+##  - checkout the correct BRANCH of GIT_REPOS in DOCKER_UPDATE_PATH
+##  - launch a build of IMAGE with special option to copy the git repos checkouted
+##  - push the image to UPDATED_IMAGE_NAME
+
+
+#!-
+. /etc/shlib
+#!-
+
+
+DOCKER_UPDATE_PATH=${DOCKER_UPDATE_PATH:-/srv/docker-builder}
+
+
+include common
+include pretty
+
+usage="$exname COMPONENT CHARM MASTER_IMAGE_NAME BRANCH"
+
+if [ "$#" == 0 ]; then
+    print_usage
+    exit 0
+fi
+
+COMPONENT_NAME="$1"
+CHARM="$2"
+MASTER_IMAGE_NAME="$3"
+BRANCH="$4"
+
+if [ -z "$COMPONENT_NAME" ]; then
+    print_error "You need to specify a component name as first argument."
+fi
+
+if [ -z "$CHARM" ]; then
+    print_error "You need to specify a charm name as second argument."
+fi
+
+if [ -z "$MASTER_IMAGE_NAME" ]; then
+    print_error "You need to specify a master image ame as first argument. (ie: docker.0k.io/odoo:master)"
+fi
+
+if [ -z "$BRANCH" ]; then
+    print_error "You need to specify a branch as fourth argument. (ie: 8.0/0k/dev/master)"
+fi
+
+
+. /etc/charm/global.conf
+
+## git-sub co should be so much better !
+set -ex
+
+mkdir -p "$DOCKER_UPDATE_PATH"
+cd "$DOCKER_UPDATE_PATH"
+rm -rf "$COMPONENT_NAME"
+time git sub clone $GIT_0K_CLONE_OPTIONS $GIT_0K_SUB_CLONE_OPTIONS -b "$BRANCH" \
+    "$GIT_0K_BASE"/0k/"$COMPONENT_NAME"
+docker rmi "$CHARM" || true
+export DOCKER_RUN_OPTS="-v $DOCKER_UPDATE_PATH/$COMPONENT_NAME:$DOCKER_UPDATE_PATH/$COMPONENT_NAME"
+time ODOO_CP_FROM_DIR="$DOCKER_UPDATE_PATH/$COMPONENT_NAME" EXTRA_CHARM_VARS="ODOO_CP_FROM_DIR" docker-build-charm "$CHARM"
+
+docker tag "$CHARM" "$MASTER_IMAGE_NAME" 
+
+docker push "$MASTER_IMAGE_NAME"
+
diff --git a/precise/docker-builder/src/usr/local/bin/docker-update b/precise/docker-builder/src/usr/local/bin/docker-update
new file mode 100755
index 0000000..5e1302c
--- /dev/null
+++ b/precise/docker-builder/src/usr/local/bin/docker-update
@@ -0,0 +1,110 @@
+#!/bin/bash
+
+
+#!-
+. /etc/shlib
+#!-
+
+
+DOCKER_UPDATE_PATH=${DOCKER_UPDATE_PATH:-/srv/docker-builder}
+
+
+include common
+include pretty
+
+usage="$exname COMPONENT MASTER_IMAGE_NAME BRANCH UPDATED_IMAGE_NAME"
+
+
+COMPONENT_NAME="$1"
+MASTER_IMAGE_NAME="$2"
+BRANCH="$3"
+UPDATED_IMAGE_NAME="$4"
+
+## Note: we will need in the DOCKER_UPDATE_HOST:
+##  - git-sub
+
+## should we check for aufs ?
+
+mkdir -p "$DOCKER_UPDATE_PATH"
+cd "$DOCKER_UPDATE_PATH"
+if ! [ -d "$COMPONENT_NAME" ]; then
+   echo "ERROR: repository $DOCKER_UPDATE_PATH/$COMPONENT_NAME is not existent."
+   echo "You should build it on this host prior to run this hook."
+   echo "As a remainder: this host is supposed to keep the reference git that"
+   echo "was used to built the master image."
+   exit 1
+fi
+
+if [ -e "$COMPONENT_NAME.locked" ]; then
+   echo "Master is being updated."
+   echo "Or '$COMPONENT_NAME.locked' file was left dangling over."
+   exit 1
+fi
+
+
+clean_all() {
+   cd /
+   mountpoint "$tmpdir_root" 2>/dev/null && umount "$tmpdir_root"
+   [ -d "$tmpdir_root" ] && rmdir "$tmpdir_root"
+   [ -d "$tmpdir_changes" ] && rm -rf "$tmpdir_changes"
+}
+
+tmpdir_changes=$(mktemp -d /tmp/$COMPONENT_NAME.changes.XXXXXX)
+tmpdir_root=$(mktemp -d /tmp/$COMPONENT_NAME.root.XXXXXX)
+
+trap "clean_all" EXIT
+mount -t aufs -o br=$tmpdir_changes:$DOCKER_UPDATE_PATH/$COMPONENT_NAME -o udba=none  none "$tmpdir_root"
+cd "$tmpdir_root"
+
+## XXXvlab: We probably would need to:
+##   - fetch only the module concerned
+##   - fetch only the ref concerned
+git fetch origin "$BRANCH"
+git checkout "$BRANCH"
+git sub update
+
+cd / &&
+umount "$tmpdir_root" &&
+rmdir "$tmpdir_root"
+if [ "$?" != 0 ]; then
+    echo "Uh oh... could not umount aufs $tmpdir_root or delete it."
+    exit 1
+fi
+cd "$tmpdir_changes"
+
+echo "Cleaning the change layer."
+find  . -name .git -type d -exec  rm -rf {} \; -prune
+
+
+
+## XXXvlab: if we produced it we shouldn't have to pull it
+#
+#echo "Pulling $MASTER_IMAGE_NAME"
+#docker pull "$MASTER_IMAGE_NAME" || exit 1
+container_id=$(
+    docker run -d \
+    -v $tmpdir_changes:/mnt/changes \
+    --entrypoint '/bin/bash' \
+    "$MASTER_IMAGE_NAME" \
+    -c "
+        mkdir -p /srv/app/{root,changes}
+        cp -a /mnt/changes /srv/app/changes/0000
+        ls /srv/app/changes/0000
+    ")
+if [ "$?" != 0 ]; then
+    echo "Failed to call docker run..."
+    exit 1
+fi
+if [ "$(docker wait "$container_id")" != "0" ]; then
+    echo "Copy of changes to docker images failed !"
+    echo "Log of container:"
+    docker logs "$container_id"
+    exit 1
+fi
+
+docker commit --author "$exname" \
+    --message "Automatic Updater" \
+    "$container_id" \
+    "$UPDATED_IMAGE_NAME"
+
+docker push "$UPDATED_IMAGE_NAME"