--- a/Dockerfile	Tue Dec 05 00:11:48 2017 +0100
+++ b/Dockerfile	Wed Dec 06 09:56:32 2017 +0100
@@ -1,8 +1,17 @@
 # Builds Beremiz windows installer
 
-# usage :
+# initialize :
 #   docker build --build-arg UID=$(id -u) --build-arg GID=$(id -g) -t beremiz_builder .
+#
+# build installer as-is :
 #   docker run -v ~/src:/home/devel/src -v ~/build/:/home/devel/build --rm beremiz_builder
+#
+# to use on code-build-test cycle :
+#   docker create --name current -v ~/src:/home/devel/src -v ~/build/:/home/devel/build -i -t beremiz_builder /bin/bash
+#   docker start -i current 
+#       # call build operations from here
+#   docker stop current
+#   docker rm current
 
 FROM ubuntu:xenial
 

--- a/Makefile	Tue Dec 05 00:11:48 2017 +0100
+++ b/Makefile	Wed Dec 06 09:56:32 2017 +0100
@@ -27,8 +27,9 @@
 
 version = 1.2-rc1
 
+src := $(shell dirname $(lastword $(MAKEFILE_LIST)))
 HGREMOTE ?= https://hg.beremiz.org/
-HGROOT ?= $(abspath $(CURDIR)/..)
+HGROOT ?= $(abspath $(src)/..)
 GITROOT := $(HGROOT)
 DIST =
 CPUS = 8
@@ -45,7 +46,6 @@
 	cp $(CROSS_COMPILE_LIBS_DIR)/libstdc++-6.dll $(1)
 endef
 
-src := $(shell dirname $(lastword $(MAKEFILE_LIST)))
 distfiles = $(src)/distfiles
 sfmirror = downloads
 tmp := $(shell mktemp -d)