Move main package to cmd subdir

Makefile

@@ -13,7 +13,8 @@
 # limitations under the License.
 
 GO := go
-pkgs  = $(shell $(GO) list ./... | grep -v vendor)
+pkgs     = $(shell $(GO) list ./... | grep -v vendor)
+cmd_pkgs = $(shell cd cmd && $(GO) list ./... | grep -v vendor)
 arch ?= $(shell go env GOARCH)
 
 ifeq ($(arch), amd64)
@@ -28,6 +29,7 @@ all: presubmit build test
 test:
 	@echo ">> running tests"
 	@$(GO) test -short -race $(pkgs)
+	@cd cmd && $(GO) test -short -race $(cmd_pkgs)
 
 test-integration:
 	GO_FLAGS="-race" ./build/build.sh
@@ -41,10 +43,12 @@ test-runner:
 format:
 	@echo ">> formatting code"
 	@$(GO) fmt $(pkgs)
+	@cd cmd && $(GO) fmt $(cmd_pkgs)
 
 vet:
 	@echo ">> vetting code"
 	@$(GO) vet $(pkgs)
+	@cd cmd && $(GO) vet $(cmd_pkgs)
 
 build: assets
 	@echo ">> building binaries"

build/build.sh

@@ -50,12 +50,15 @@ if [ -n "$VERBOSE" ]; then
   echo "Building with -ldflags $ldflags"
 fi
 
-
+# Since github.com/google/cadvisor/cmd is a submodule, we must build from inside that directory
+output_file="$PWD/cadvisor"
+pushd cmd > /dev/null
 if [ -z "$GOARCH" ]
 then
-  GOBIN=$PWD go build ${GO_FLAGS} -ldflags "${ldflags}" "${repo_path}"
+  go build ${GO_FLAGS} -ldflags "${ldflags}" -o "${output_file}" "${repo_path}/cmd"
 else
-  GOBIN=$PWD env GOOS=linux GOARCH=$GOARCH go build ${GO_FLAGS} -ldflags "${ldflags}" "${repo_path}"
+  env GOOS=linux GOARCH=$GOARCH go build ${GO_FLAGS} -ldflags "${ldflags}" -o "${output_file}" "${repo_path}/cmd"
 fi
+popd > /dev/null
 
 exit 0

cmd/cadvisor.go

@@ -82,7 +82,7 @@ var (
 		container.NetworkAdvancedTcpUsageMetrics: struct{}{},
 		container.ProcessSchedulerMetrics:        struct{}{},
 		container.ProcessMetrics:                 struct{}{},
-		container.HugetlbUsageMetrics:			  struct{}{},
+		container.HugetlbUsageMetrics:            struct{}{},
 	}}
 
 	// List of metrics that can be ignored.
@@ -96,7 +96,7 @@ var (
 		container.PerCpuUsageMetrics:             struct{}{},
 		container.ProcessSchedulerMetrics:        struct{}{},
 		container.ProcessMetrics:                 struct{}{},
-		container.HugetlbUsageMetrics:			  struct{}{},
+		container.HugetlbUsageMetrics:            struct{}{},
 	}
 )
 
@@ -106,7 +106,7 @@ type metricSetValue struct {
 
 func (ml *metricSetValue) String() string {
 	var values []string
-	for metric, _ := range ml.MetricSet {
+	for metric := range ml.MetricSet {
 		values = append(values, string(metric))
 	}
 	return strings.Join(values, ",")

cmd/cadvisor_test.go

@@ -65,8 +65,7 @@ func TestToIncludedMetrics(t *testing.T) {
 		{
 			container.CpuUsageMetrics: struct{}{},
 		},
-		{
-		},
+		{},
 		container.AllMetrics,
 	}
 
@@ -85,7 +84,7 @@ func TestToIncludedMetrics(t *testing.T) {
 			container.NetworkUdpUsageMetrics:         struct{}{},
 			container.ProcessMetrics:                 struct{}{},
 			container.AppMetrics:                     struct{}{},
-			container.HugetlbUsageMetrics:			  struct{}{},
+			container.HugetlbUsageMetrics:            struct{}{},
 		},
 		container.AllMetrics,
 		{},

doc.go

@@ -0,0 +1,15 @@
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// 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 cadvisor