Add lint subcommand

cmd/plugin/lints/deployment.go

@@ -0,0 +1,108 @@
+/*
+Copyright 2019 The Kubernetes 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 lints
+
+import (
+	"fmt"
+	"strings"
+
+	v1 "k8s.io/api/apps/v1"
+	kmeta "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/ingress-nginx/cmd/plugin/util"
+)
+
+// DeploymentLint is a validation for a deployment
+type DeploymentLint struct {
+	message string
+	version string
+	issue   int
+	f       func(cmp v1.Deployment) bool
+}
+
+// Check returns true if the lint detects an issue
+func (lint DeploymentLint) Check(obj kmeta.Object) bool {
+	cmp := obj.(*v1.Deployment)
+	return lint.f(*cmp)
+}
+
+// Message is a description of the lint
+func (lint DeploymentLint) Message() string {
+	return lint.message
+}
+
+// Version is the ingress-nginx version the lint was added for, or the empty string
+func (lint DeploymentLint) Version() string {
+	return lint.version
+}
+
+// Link is a URL to the issue or PR explaining the lint
+func (lint DeploymentLint) Link() string {
+	if lint.issue > 0 {
+		return fmt.Sprintf("%v%v", util.IssuePrefix, lint.issue)
+	}
+
+	return ""
+}
+
+// GetDeploymentLints retuns all of the lints for ingresses
+func GetDeploymentLints() []DeploymentLint {
+	return []DeploymentLint{
+		removedFlag("sort-backends", 3655, "0.22.0"),
+		removedFlag("force-namespace-isolation", 3887, "0.24.0"),
+	}
+}
+
+func removedFlag(flag string, issueNumber int, version string) DeploymentLint {
+	return DeploymentLint{
+		message: fmt.Sprintf("Uses removed config flag --%v", flag),
+		issue:   issueNumber,
+		version: version,
+		f: func(dep v1.Deployment) bool {
+			if !isIngressNginxDeployment(dep) {
+				return false
+			}
+
+			args := getNginxArgs(dep)
+			for _, arg := range args {
+				if strings.HasPrefix(arg, fmt.Sprintf("--%v", flag)) {
+					return true
+				}
+			}
+
+			return false
+		},
+	}
+}
+
+func getNginxArgs(dep v1.Deployment) []string {
+	for _, container := range dep.Spec.Template.Spec.Containers {
+		if len(container.Args) > 0 && container.Args[0] == "/nginx-ingress-controller" {
+			return container.Args
+		}
+	}
+	return make([]string, 0)
+}
+
+func isIngressNginxDeployment(dep v1.Deployment) bool {
+	containers := dep.Spec.Template.Spec.Containers
+	for _, container := range containers {
+		if len(container.Args) > 0 && container.Args[0] == "/nginx-ingress-controller" {
+			return true
+		}
+	}
+	return false
+}