Move packages to proejct/pkg to follow go project folder structure convention (#1190)

cmd/builder/Dockerfile.fission-builder

@@ -0,0 +1,26 @@
+FROM golang:1.11-alpine as fission-builder
+RUN apk add bash ca-certificates git gcc g++ libc-dev
+
+ARG GITCOMMIT=unknown
+# E.g. GITCOMMIT=$(git rev-parse HEAD)
+
+ARG BUILDVERSION=unknown
+# E.g. BUILDVERSION=$(git rev-parse HEAD)
+
+ARG BUILDDATE=unknown
+# E.g. BUILDDATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+
+ARG GOPKG=github.com/fission/fission
+COPY . /go/src/${GOPKG}
+WORKDIR /go/src/${GOPKG}/cmd/builder
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -o /go/bin/builder \
+    -gcflags=-trimpath=$GOPATH \
+    -asmflags=-trimpath=$GOPATH \
+    -ldflags "-X github.com/fission/fission/pkg/info.GitCommit=${GITCOMMIT} -X github.com/fission/fission/pkg/info.BuildDate=${BUILDDATE} -X github.com/fission/fission/pkg/info.Version=${BUILDVERSION}"
+
+FROM alpine:3.5
+COPY --from=fission-builder /go/bin/builder /
+EXPOSE 8001
+
+ENTRYPOINT ["/builder"]

cmd/builder/app/server.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2016 The Fission Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package app
+
+import (
+	"net/http"
+
+	"go.uber.org/zap"
+
+	builder "github.com/fission/fission/pkg/builder"
+)
+
+// Usage: builder <shared volume path>
+func Run(logger *zap.Logger, shareVolume string) error {
+	builder := builder.MakeBuilder(logger, shareVolume)
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", builder.Handler)
+	mux.HandleFunc("/version", builder.VersionHandler)
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	})
+	return http.ListenAndServe(":8001", mux)
+}

cmd/builder/main.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2018 The Fission Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"log"
+	"os"
+
+	"go.uber.org/zap"
+
+	"github.com/fission/fission/cmd/builder/app"
+)
+
+// Usage: builder <shared volume path>
+func main() {
+	logger, err := zap.NewProduction()
+	if err != nil {
+		log.Fatalf("can't initialize zap logger: %v", err)
+	}
+	defer logger.Sync()
+
+	shareVolume := os.Args[1]
+	if _, err := os.Stat(shareVolume); err != nil {
+		if os.IsNotExist(err) {
+			err = os.MkdirAll(shareVolume, os.ModeDir|0700)
+			if err != nil {
+				logger.Fatal("error creating directory: %v", zap.Error(err), zap.String("directory", shareVolume))
+			}
+		}
+	}
+
+	err = app.Run(logger, shareVolume)
+	logger.Error("error running builder", zap.Error(err))
+}