feature: display the size of images (#25)

* feature: display the size of images

* docs update

* minor: upgrade gomod version

---------

Co-authored-by: mandochen <[email protected]>

README.md

@@ -61,7 +61,7 @@ Examples:
 
 Flags:
   -A, --all-namespaces         if present, list images in all namespaces.
-  -c, --columns string         specify the columns to display, separated by comma. [0:Namespace, 1:PodName, 2:ContainerName, 3:ContainerImage, 4:ImagePullPolicy] (default "1,2,3")
+  -c, --columns string         specify the columns to display, separated by comma. [0:Namespace, 1:PodName, 2:ContainerName, 3:ContainerImage, 4:ImagePullPolicy, 5:ImageSize] (default "1,2,3")
   -C, --context string         The name of the kubeconfig context to use.
   -h, --help                   help for kubectl-images
   -k, --kubeconfig string      path to the kubeconfig file to use for CLI requests.

cmd/main.go

@@ -9,7 +9,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-const version = "0.5.2"
+const version = "0.6.0"
 
 var rootCmd *cobra.Command
 
@@ -55,7 +55,7 @@ func init() {
 	}
 	rootCmd.Flags().BoolP("all-namespaces", "A", false, "if present, list images in all namespaces.")
 	rootCmd.Flags().StringP("namespace", "n", "", "if present, list images in the specified namespace only. Use current namespace as fallback.")
-	rootCmd.Flags().StringP("columns", "c", "1,2,3", "specify the columns to display, separated by comma. [0:Namespace, 1:PodName, 2:ContainerName, 3:ContainerImage, 4:ImagePullPolicy]")
+	rootCmd.Flags().StringP("columns", "c", "1,2,3", "specify the columns to display, separated by comma. [0:Namespace, 1:PodName, 2:ContainerName, 3:ContainerImage, 4:ImagePullPolicy, 5:ImageSize]")
 	rootCmd.Flags().StringP("kubeconfig", "k", "", "path to the kubeconfig file to use for CLI requests.")
 	rootCmd.Flags().StringP("output-format", "o", "table", "output format. [json(j)|table(t)|yaml(y)]")
 	rootCmd.Flags().StringP("context", "C", "", "The name of the kubeconfig context to use.")

go.mod

@@ -1,9 +1,16 @@
 module github.com/chenjiandongx/kubectl-images
 
-go 1.13
+go 1.18
 
 require (
+	github.com/dustin/go-humanize v1.0.1
 	github.com/olekukonko/tablewriter v0.0.4
 	github.com/spf13/cobra v0.0.5
 	gopkg.in/yaml.v2 v2.2.8
 )
+
+require (
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/mattn/go-runewidth v0.0.7 // indirect
+	github.com/spf13/pflag v1.0.3 // indirect
+)

go.sum

@@ -5,6 +5,8 @@ github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8Nz
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=

kubectl_images.go

@@ -6,20 +6,24 @@ import (
 	"os"
 	"os/exec"
 	"regexp"
+	"strconv"
 	"strings"
 
+	"github.com/dustin/go-humanize"
 	"github.com/olekukonko/tablewriter"
 	"gopkg.in/yaml.v2"
 )
 
 const (
-	gotemplate = `go-template={{range .items}} {{.metadata.namespace}} {{","}} {{.metadata.name}} {{","}} {{range .spec.containers}} {{.name}} {{","}} {{.image}} {{","}} {{.imagePullPolicy}} {{"\n"}} {{end}} {{range .spec.initContainers}} {{"(init)"}} {{.name}} {{","}} {{.image}} {{","}} {{.imagePullPolicy}} {{"\n"}} {{end}} {{end}}`
+	podTemplate  = `go-template={{range .items}} {{.metadata.namespace}} {{","}} {{.metadata.name}} {{","}} {{range .spec.containers}} {{.name}} {{","}} {{.image}} {{","}} {{.imagePullPolicy}} {{"\n"}} {{end}} {{range .spec.initContainers}} {{"(init)"}} {{.name}} {{","}} {{.image}} {{","}} {{.imagePullPolicy}} {{"\n"}} {{end}} {{end}}`
+	nodeTemplate = `go-template={{range .items}} {{range .status.images}} {{range .names}} {{.}} {{","}} {{end}} {{.sizeBytes}} {{"\n"}} {{end}} {{end}}`
 
 	labelNamespace       = "Namespace"
 	labelPod             = "Pod"
 	labelContainer       = "Container"
 	labelImage           = "Image"
 	labelImagePullPolicy = "ImagePullPolicy"
+	labelImageSize       = "ImageSize"
 )
 
 type Parameters struct {
@@ -33,14 +37,17 @@ type Parameters struct {
 
 // KubeImage is the representation of a container image used in the cluster.
 type KubeImage struct {
-	entities []*ImageEntity
-	columns  []string
-	regx     *regexp.Regexp
-	params   Parameters
+	entities     []*ImageEntity
+	columns      []string
+	regx         *regexp.Regexp
+	params       Parameters
+	imageSize    map[string]int
+	needNodeInfo bool
 }
 
 // NewKubeImage creates a new KubeImage instance.
 func NewKubeImage(regx *regexp.Regexp, params Parameters) *KubeImage {
+	var needNodeInfo bool
 	names := make([]string, 0)
 	for _, c := range stringSplit(params.Columns, ",") {
 		switch c {
@@ -54,13 +61,18 @@ func NewKubeImage(regx *regexp.Regexp, params Parameters) *KubeImage {
 			names = append(names, labelImage)
 		case "4":
 			names = append(names, labelImagePullPolicy)
+		case "5":
+			names = append(names, labelImageSize)
+			needNodeInfo = true
 		}
 	}
 
 	return &KubeImage{
-		columns: names,
-		params:  params,
-		regx:    regx,
+		columns:      names,
+		params:       params,
+		regx:         regx,
+		imageSize:    make(map[string]int),
+		needNodeInfo: needNodeInfo,
 	}
 }
 
@@ -71,6 +83,7 @@ type ImageEntity struct {
 	Container       string `json:"container,omitempty" yaml:"container,omitempty"`
 	Image           string `json:"image,omitempty" yaml:"image,omitempty"`
 	ImagePullPolicy string `json:"imagePullPolicy,omitempty" yaml:"imagePullPolicy,omitempty"`
+	ImageSize       string `json:"imageSize,omitempty" yaml:"imageSize,omitempty"`
 }
 
 func (ie *ImageEntity) selectBy(columns []string) []string {
@@ -87,6 +100,8 @@ func (ie *ImageEntity) selectBy(columns []string) []string {
 			result = append(result, ie.Image)
 		case labelImagePullPolicy:
 			result = append(result, ie.ImagePullPolicy)
+		case labelImageSize:
+			result = append(result, ie.ImageSize)
 		}
 	}
 	return result
@@ -106,6 +121,8 @@ func (ie *ImageEntity) filterBy(columns []string) ImageEntity {
 			entity.Image = ie.Image
 		case labelImagePullPolicy:
 			entity.ImagePullPolicy = ie.ImagePullPolicy
+		case labelImageSize:
+			entity.ImageSize = ie.ImageSize
 		}
 	}
 	return entity
@@ -142,8 +159,8 @@ func stringSplit(in, sep string) []string {
 	return out
 }
 
-// Commands builds the command to be executed based on user input.
-func (ki *KubeImage) Commands() []string {
+// podCommands builds the command to be executed based on user input.
+func (ki *KubeImage) podCommands() []string {
 	kubecfg := make([]string, 0)
 	if ki.params.KubeConfig != "" {
 		kubecfg = append(kubecfg, "--kubeconfig", ki.params.KubeConfig)
@@ -154,18 +171,60 @@ func (ki *KubeImage) Commands() []string {
 	}
 
 	if ki.params.AllNamespace {
-		return append([]string{"get", "pods", "--all-namespaces", "-o", gotemplate}, kubecfg...)
+		return append([]string{"get", "pods", "--all-namespaces", "-o", podTemplate}, kubecfg...)
 	} else if ki.params.Namespace != "" {
-		return append([]string{"get", "pods", "-n", ki.params.Namespace, "-o", gotemplate}, kubecfg...)
+		return append([]string{"get", "pods", "-n", ki.params.Namespace, "-o", podTemplate}, kubecfg...)
 	}
-	return append([]string{"get", "pods", "-o", gotemplate}, kubecfg...)
+	return append([]string{"get", "pods", "-o", podTemplate}, kubecfg...)
 }
 
-func (ki *KubeImage) exec() {
-	process := exec.Command("kubectl", ki.Commands()...)
+func (ki *KubeImage) nodeCommands() []string {
+	kubecfg := make([]string, 0)
+	if ki.params.KubeConfig != "" {
+		kubecfg = append(kubecfg, "--kubeconfig", ki.params.KubeConfig)
+	}
+
+	if ki.params.Context != "" {
+		kubecfg = append(kubecfg, "--context", ki.params.Context)
+	}
+
+	return append([]string{"get", "nodes", "-o", nodeTemplate}, kubecfg...)
+}
+
+func (ki *KubeImage) execNodeCommand() {
+	process := exec.Command("kubectl", ki.nodeCommands()...)
+	bs, err := process.CombinedOutput()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "[Oh...] Execute nodes command error: %v, %s", err, string(bs))
+		os.Exit(1)
+	}
+
+	for _, line := range stringSplit(string(bs), "\n") {
+		items := stringSplit(line, ",")
+		switch len(items) {
+		case 3:
+			size, err := strconv.Atoi(items[2])
+			if err != nil {
+				continue
+			}
+			ki.imageSize[items[0]] = size
+			ki.imageSize[items[1]] = size
+		}
+	}
+
+	for _, entity := range ki.entities {
+		size, ok := ki.imageSize[entity.Image]
+		if ok {
+			entity.ImageSize = humanize.IBytes(uint64(size))
+		}
+	}
+}
+
+func (ki *KubeImage) execPodCommand() {
+	process := exec.Command("kubectl", ki.podCommands()...)
 	bs, err := process.CombinedOutput()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "[Oh...] Execute command error: %v, %s", err, string(bs))
+		fmt.Fprintf(os.Stderr, "[Oh...] Execute pods command error: %v, %s", err, string(bs))
 		os.Exit(1)
 	}
 
@@ -293,7 +352,10 @@ func (ki *KubeImage) yamlRender() {
 
 // Render renders and displays the table output.
 func (ki *KubeImage) Render(format string) {
-	ki.exec()
+	ki.execPodCommand()
+	if ki.needNodeInfo {
+		ki.execNodeCommand()
+	}
 
 	if len(ki.entities) == 0 {
 		fmt.Fprintln(os.Stdout, "[Oh...] No images matched!")