new: [docker-builder] don't force a reset origin.

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

@@ -57,12 +57,14 @@ tmpdir_root=$(mktemp -d $tmpdir/$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 "$tmpdir_root"
-
+set -eux
 ## XXXvlab: We probably would need to:
 ##   - fetch only the module concerned
 ##   - fetch only the ref concerned
 git fetch origin "$BRANCH"
 git checkout "$BRANCH"
+git reset --hard origin/$BRANCH
+#git reset --hard "origin/$BRANCH"
 git sub update
 
 cd / &&