added base dockerfile (#14)

Added base dockerfile, updated circleci config.

Author: priom

.circleci/config.yml

@@ -1,10 +1,18 @@
 version: 2
 jobs:
   build:
+    working_directory: $HOME/go/src/github.com/ChainSafeSystems/go-pre
     docker:
       - image: circleci/golang:1.11
 
     steps:
-      - checkout
+      - checkout:
+          path: $HOME/go/src/github.com/ChainSafeSystems/go-pre
+      - attach_workspace:
+          at: $HOME/go/src/github.com/ChainSafeSystems/go-pre
+
       - run: go get -v -t -d ./...
-      - run: go test -v ./...
+      - run: go test -v ./...
+      - run: gometalinter ./...
+
+

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:1.11.5-alpine3.8 as build
+
+RUN apk --no-cache add git linux-headers ca-certificates
+COPY . /go/src/github.com/ChainSafeSystems/go-pre
+WORKDIR /go/src/github.com/ChainSafeSystems/go-pre
+ENV GO111MODULE=off
+RUN go install -v ./...
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o go-pre .
+
+
+FROM scratch
+
+WORKDIR /
+COPY --from=builder ./go/src/github.com/ChainSafeSystems/go-pre/go-pre .
+CMD ["./go-pre"]

codec/encode.go

@@ -56,7 +56,7 @@ func encodeInteger(i int) ([]byte, error) {
 		o := make([]byte, 4)
 		binary.LittleEndian.PutUint32(o, uint32(i<<2)+2)
 		return o, nil
-	} 
+	}
 
 	// TODO: this case only works for integers between 2**30 and 2**64 due to the fact that Go's integers only hold up
 	// to 2 ** 64. need to implement this case for integers > 2**64 using the big.Int library
@@ -89,6 +89,6 @@ func encodeInteger(i int) ([]byte, error) {
 func encodeBool(l bool) ([]byte, error) {
 	if l {
 		return []byte{0x01}, nil
-	} 
+	}
 	return []byte{0x00}, nil
 }