Add makefile target for cross

Can be run with:

```
docker build --rm --force-rm -t notary .

docker run --rm -it \
    -v $(pwd)/cross:/go/src/github.com/docker/notary/cross \
    notary \
    make cross
```

Signed-off-by: Jessica Frazelle <princess@docker.com>

.gitignore

@@ -1,4 +1,5 @@
 /cmd/notary-server/notary-server
 cover
 bin
+cross
 *.swp

Dockerfile

@@ -1,7 +1,7 @@
 FROM golang:1.4.2-cross
 
 RUN apt-get update && apt-get install -y \
-    libltdl-dev \
+	libltdl-dev \
 	--no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 

Makefile

@@ -2,14 +2,17 @@
 PREFIX?=$(shell pwd)
 
 # Used to populate version variable in main package.
-GO_LDFLAGS=-ldflags "-X `go list ./version`.Version `git describe --match 'v[0-9]*' --dirty='.m' --always`"
+GO_LDFLAGS=-ldflags "-w -X `go list ./version`.Version `git describe --match 'v[0-9]*' --dirty='.m' --always`"
+GO_LDFLAGS_STATIC=-ldflags "-w -extldflags -static -X `go list ./version`.Version `git describe --match 'v[0-9]*' --dirty='.m' --always`"
+GOOSES = darwin freebsd linux windows
+GOARCHS = amd64 386
 
-.PHONY: clean all fmt vet lint build test binaries
+.PHONY: clean all fmt vet lint build test binaries cross
 .DEFAULT: default
 all: AUTHORS clean fmt vet fmt lint build test binaries
 
 AUTHORS: .git/HEAD
-	 git log --format='%aN <%aE>' | sort -fu > $@
+	git log --format='%aN <%aE>' | sort -fu > $@
 
 # This only needs to be generated by hand when cutting full releases.
 version/version.go:
@@ -62,6 +65,15 @@ clean-protos:
 binaries: ${PREFIX}/bin/notary-server ${PREFIX}/bin/notary ${PREFIX}/bin/notary-signer
 	@echo "+ $@"
 
+
+define template
+mkdir -p ${PREFIX}/cross/$(1)/$(2);
+GOOS=$(1) GOARCH=$(2) go build -o ${PREFIX}/cross/$(1)/$(2)/notary -a -tags "static_build netgo" -installsuffix netgo ${GO_LDFLAGS_STATIC} ./cmd/notary;
+endef
+
+cross:
+	$(foreach GOARCH,$(GOARCHS),$(foreach GOOS,$(GOOSES),$(call template,$(GOOS),$(GOARCH))))
+
 clean:
 	@echo "+ $@"
 	@rm -rf "${PREFIX}/bin/notary-server" "${PREFIX}/bin/notary" "${PREFIX}/bin/notary-signer"

notary-server-Dockerfile

@@ -2,8 +2,8 @@ FROM golang
 
 RUN apt-get update && apt-get install -y \
     libltdl-dev \
-	--no-install-recommends \
-	&& rm -rf /var/lib/apt/lists/*
+    --no-install-recommends \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY . /go/src/github.com/docker/notary
 

notary-signer-Dockerfile

@@ -1,5 +1,4 @@
 FROM diogomonica/golang-softhsm2
-
 MAINTAINER Diogo Monica "diogo@docker.com"
 
 # CHANGE-ME: Default values for SoftHSM2 PIN and SOPIN, used to initialize the first token
@@ -9,22 +8,13 @@ ENV LIBDIR="/usr/local/lib/softhsm/"
 
 # Install openSC and dependencies
 RUN apt-get update && \
-	apt-get install -y \
-	build-essential \
-	autoconf \
-	automake \
-	libtool \
-	gtk-doc-tools \
-	gengetopt \
-	help2man \
-	libpcsclite-dev \
-	libzip-dev \
-	opensc \
-	libssl-dev \
-	usbutils \
-	vim \
-	--no-install-recommends \
-	&& rm -rf /var/lib/apt/lists/*
+    apt-get install -y \
+    libltdl-dev \
+    libpcsclite-dev \
+    opensc \
+    usbutils \
+    --no-install-recommends \
+    && rm -rf /var/lib/apt/lists/*
 
 # Initialize the SoftHSM2 token on slod 0, using PIN and SOPIN varaibles
 RUN softhsm2-util --init-token --slot 0 --label "test_token" --pin $PIN --so-pin $SOPIN
@@ -39,5 +29,4 @@ RUN go install github.com/docker/notary/cmd/notary-signer
 
 EXPOSE 4443
 
-#ENTRYPOINT notary-signer -cert /go/src/github.com/docker/notary/fixtures/notary-signer.crt -key /go/src/github.com/docker/notary/fixtures/notary-signer.key -debug -pkcs11 /usr/lib/x86_64-linux-gnu/opensc-pkcs11.so -pin 123456
 ENTRYPOINT notary-signer -cert /go/src/github.com/docker/notary/fixtures/notary-signer.crt -key /go/src/github.com/docker/notary/fixtures/notary-signer.key -debug -pkcs11 $LIBDIR/libsofthsm2.so -pin 1234