add build command for small binaries

.gitignore

@@ -1,3 +1,6 @@
+bin/*
+
+
 # Binaries for programs and plugins
 *.exe
 *.exe~

Makefile

@@ -1,18 +1,26 @@
 PROJECT_DIR = $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 
+BUILD_IMAGE      = local/pspy-build:latest
+BUILD_DOCKERFILE = $(PROJECT_DIR)/docker/Dockerfile.build
+
 DEV_IMAGE      = local/pspy-development:latest
 DEV_DOCKERFILE = $(PROJECT_DIR)/docker/Dockerfile.development
 
 TEST_IMAGE      = local/pspy-testing:latest
 TEST_DOCKERFILE = $(PROJECT_DIR)/docker/Dockerfile.testing
 
+# Run unit test and integration test inside container
 test:
 	docker build -f $(TEST_DOCKERFILE) -t $(TEST_IMAGE) . 
 	docker run -it --rm $(TEST_IMAGE)
 
+# Build Docker image for development
+# pspy has to run on Linux - use this if you develop on another OS
 dev-build:
 	docker build -f $(DEV_DOCKERFILE) -t $(DEV_IMAGE) .
 
+# Drops you into a shell in the development container and mounts the source code
+# You can edit to source on your host, then run go commans (e.g., `go test ./...`) inside the container
 dev:
 	docker run -it \
 		       --rm \
@@ -23,26 +31,48 @@ dev:
 EXAMPLE_IMAGE      = local/pspy-example:latest
 EXAMPLE_DOCKERFILE = $(PROJECT_DIR)/docker/Dockerfile.example
 
+# Run the example demonstrating what pspy does
 example:
 	docker build -t $(EXAMPLE_IMAGE) -f $(EXAMPLE_DOCKERFILE) .
 	docker run -it --rm $(EXAMPLE_IMAGE)
 
-BUILD_IMAGE = golang:1.10-alpine
 
-release:
+build-build-image:
+	docker build -f $(BUILD_DOCKERFILE) -t $(BUILD_IMAGE) .
+
+# Build different binaries
+# builds binaries for both 32bit and 64bit systems
+# builds one set of static binaries that should work on any system without dependencies, but are huge
+# builds another set of binaries that are as small as possible, but may not work 
+build:
+	mkdir -p $(PROJECT_DIR)/bin
 	docker run -it \
 		       --rm \
 		       -v $(PROJECT_DIR):/go/src/github.com/dominicbreuker/pspy \
 			   -w "/go/src/github.com/dominicbreuker" \
 			   --env CGO_ENABLED=0 \
 			   --env GOOS=linux \
 			   --env GOARCH=386 \
-	           $(BUILD_IMAGE) go build -a -ldflags '-extldflags "-static"' -o pspy/bin/pspy32 pspy/main.go
+	           $(BUILD_IMAGE) /bin/sh -c "go build -a -ldflags '-extldflags \"-static\"' -o pspy/bin/pspy32 pspy/main.go"
 	docker run -it \
 		       --rm \
 		       -v $(PROJECT_DIR):/go/src/github.com/dominicbreuker/pspy \
 			   -w "/go/src/github.com/dominicbreuker" \
 			   --env CGO_ENABLED=0 \
 			   --env GOOS=linux \
 			   --env GOARCH=amd64 \
-	           $(BUILD_IMAGE) go build -a -ldflags '-extldflags "-static"' -o pspy/bin/pspy64 pspy/main.go
+	           $(BUILD_IMAGE) /bin/sh -c "go build -a -ldflags '-extldflags \"-static\"' -o pspy/bin/pspy64 pspy/main.go"
+	docker run -it \
+		       --rm \
+		       -v $(PROJECT_DIR):/go/src/github.com/dominicbreuker/pspy \
+			   -w "/go/src/github.com/dominicbreuker" \
+			   --env GOOS=linux \
+			   --env GOARCH=386 \
+	           $(BUILD_IMAGE) /bin/sh -c "go build -ldflags '-w -s' -o pspy/bin/pspy32s pspy/main.go && upx pspy/bin/pspy32s"
+	docker run -it \
+		       --rm \
+		       -v $(PROJECT_DIR):/go/src/github.com/dominicbreuker/pspy \
+			   -w "/go/src/github.com/dominicbreuker" \
+			   --env GOOS=linux \
+			   --env GOARCH=amd64 \
+	           $(BUILD_IMAGE) /bin/sh -c "go build -ldflags '-w -s' -o pspy/bin/pspy64s pspy/main.go && upx pspy/bin/pspy64s"

docker/Dockerfile.build

@@ -0,0 +1,3 @@
+FROM golang:1.10-alpine
+
+RUN apk add upx --no-cache