introduce top-level Makefile to build the docker binary

.gitignore

@@ -9,3 +9,4 @@ command-line-arguments.test
 .flymake*
 docker.test
 auth/auth.test
+build/

Makefile

@@ -0,0 +1,33 @@
+DOCKER_PACKAGE := github.com/dotcloud/docker
+
+BUILD_DIR := $(CURDIR)/build
+
+GOPATH ?= $(BUILD_DIR)
+export GOPATH
+
+SRC_DIR := $(GOPATH)/src
+
+DOCKER_DIR := $(SRC_DIR)/$(DOCKER_PACKAGE)
+DOCKER_MAIN := $(DOCKER_DIR)/docker
+
+DOCKER_BIN := $(CURDIR)/bin/docker
+
+.PHONY: all clean
+
+all: $(DOCKER_BIN)
+
+$(DOCKER_BIN): $(DOCKER_DIR)
+	@mkdir -p  $(dir $@)
+	(cd $(DOCKER_MAIN); go get; go build -o $@)
+
+$(DOCKER_DIR):
+	@mkdir -p $(dir $@)
+	@ln -sf $(CURDIR)/ $@
+
+clean:
+	@rm -rf $(dir $(DOCKER_BIN))
+ifeq ($(GOPATH), $(BUILD_DIR))
+	@rm -rf $(BUILD_DIR)
+else ifneq ($(DOCKER_DIR), $(realpath $(DOCKER_DIR)))
+	@rm -f $(DOCKER_DIR)
+endif

README.md

@@ -53,6 +53,22 @@ Under the hood, Docker is built on the following components:
 Install instructions
 ==================
 
+Building from source
+--------------------
+
+1. Make sure you have a [Go language](http://golang.org) compiler.
+
+    On a Debian/wheezy or Ubuntu 12.10 install the package:
+
+    ```bash
+
+    $ sudo apt-get install golang-go
+    ```
+
+2. Execute ``make``
+
+3. Find your binary in ``bin/docker``
+
 Installing on Ubuntu 12.04 and 12.10
 ------------------------------------