fix: [docker-builder] using docker-update fixes the vanishing entrypoint issue.

precise/docker-builder/src/usr/local/bin/hook-docker-update

@@ -15,7 +15,6 @@ include pretty
 
 usage="$exname COMPONENT MASTER_IMAGE_NAME BRANCH UPDATED_IMAGE_NAME"
 
-
 COMPONENT_NAME="$1"
 MASTER_IMAGE_NAME="$2"
 BRANCH="$3"
@@ -95,30 +94,11 @@ fi
 #
 #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" \
-    "$UPDATED_IMAGE_NAME"
+cat <<EOF | docker-update "$MASTER_IMAGE_NAME" -v "$tmpdir_changes:/mnt/changes"
+mkdir -p /srv/app/{root,changes}
+cp -a /mnt/changes /srv/app/changes/0000
+ls /srv/app/changes/0000
+EOF
 
 docker push "$UPDATED_IMAGE_NAME"