package main import ( "fmt" "reflect" "strings" "time" "github.com/containers/image/types" "github.com/containers/storage" "github.com/docker/go-units" digest "github.com/opencontainers/go-digest" "github.com/pkg/errors" "github.com/projectatomic/libpod/cmd/kpod/formats" "github.com/projectatomic/libpod/libpod" "github.com/projectatomic/libpod/libpod/common" "github.com/urfave/cli" ) type imagesTemplateParams struct { Repository string Tag string ID string Digest digest.Digest Created string Size string } type imagesJSONParams struct { ID string `json:"id"` Name []string `json:"names"` Digest digest.Digest `json:"digest"` Created time.Time `json:"created"` Size int64 `json:"size"` } type imagesOptions struct { quiet bool noHeading bool noTrunc bool digests bool format string } var ( imagesFlags = []cli.Flag{ cli.BoolFlag{ Name: "quiet, q", Usage: "display only image IDs", }, cli.BoolFlag{ Name: "noheading, n", Usage: "do not print column headings", }, cli.BoolFlag{ Name: "no-trunc, notruncate", Usage: "do not truncate output", }, cli.BoolFlag{ Name: "digests", Usage: "show digests", }, cli.StringFlag{ Name: "format", Usage: "Change the output format to JSON or a Go template", }, cli.StringFlag{ Name: "filter, f", Usage: "filter output based on conditions provided (default [])", }, } imagesDescription = "lists locally stored images." imagesCommand = cli.Command{ Name: "images", Usage: "list images in local storage", Description: imagesDescription, Flags: imagesFlags, Action: imagesCmd, ArgsUsage: "", UseShortOptionHandling: true, } ) func imagesCmd(c *cli.Context) error { if err := validateFlags(c, imagesFlags); err != nil { return err } runtime, err := getRuntime(c) if err != nil { return errors.Wrapf(err, "Could not get runtime") } defer runtime.Shutdown(false) var format string if c.IsSet("format") { format = c.String("format") } else { format = genImagesFormat(c.Bool("quiet"), c.Bool("noheading"), c.Bool("digests")) } opts := imagesOptions{ quiet: c.Bool("quiet"), noHeading: c.Bool("noheading"), noTrunc: c.Bool("no-trunc"), digests: c.Bool("digests"), format: format, } var imageInput string if len(c.Args()) == 1 { imageInput = c.Args().Get(0) } if len(c.Args()) > 1 { return errors.New("'kpod images' requires at most 1 argument") } params, err := runtime.ParseImageFilter(imageInput, c.String("filter")) if err != nil { return errors.Wrapf(err, "error parsing filter") } // generate the different filters labelFilter := generateImagesFilter(params, "label") beforeImageFilter := generateImagesFilter(params, "before-image") sinceImageFilter := generateImagesFilter(params, "since-image") danglingFilter := generateImagesFilter(params, "dangling") referenceFilter := generateImagesFilter(params, "reference") imageInputFilter := generateImagesFilter(params, "image-input") images, err := runtime.GetImages(params, labelFilter, beforeImageFilter, sinceImageFilter, danglingFilter, referenceFilter, imageInputFilter) if err != nil { return errors.Wrapf(err, "could not get list of images matching filter") } return generateImagesOutput(runtime, images, opts) } func genImagesFormat(quiet, noHeading, digests bool) (format string) { if quiet { return formats.IDString } format = "table {{.Repository}}\t{{.Tag}}\t" if noHeading { format = "{{.Repository}}\t{{.Tag}}\t" } if digests { format += "{{.Digest}}\t" } format += "{{.ID}}\t{{.Created}}\t{{.Size}}\t" return } // imagesToGeneric creates an empty array of interfaces for output func imagesToGeneric(templParams []imagesTemplateParams, JSONParams []imagesJSONParams) (genericParams []interface{}) { if len(templParams) > 0 { for _, v := range templParams { genericParams = append(genericParams, interface{}(v)) } return } for _, v := range JSONParams { genericParams = append(genericParams, interface{}(v)) } return } // generate the header based on the template provided func (i *imagesTemplateParams) headerMap() map[string]string { v := reflect.Indirect(reflect.ValueOf(i)) values := make(map[string]string) for i := 0; i < v.NumField(); i++ { key := v.Type().Field(i).Name value := key if value == "ID" { value = "Image" + value } values[key] = strings.ToUpper(splitCamelCase(value)) } return values } // getImagesTemplateOutput returns the images information to be printed in human readable format func getImagesTemplateOutput(runtime *libpod.Runtime, images []*storage.Image, opts imagesOptions) (imagesOutput []imagesTemplateParams) { var ( lastID string ) for _, img := range images { if opts.quiet && lastID == img.ID { continue // quiet should not show the same ID multiple times } createdTime := img.Created imageID := "sha256:" + img.ID if !opts.noTrunc { imageID = img.ID[:idTruncLength] } repository := "" tag := "" if len(img.Names) > 0 { arr := strings.Split(img.Names[0], ":") repository = arr[0] if len(arr) == 2 { tag = arr[1] } } info, imageDigest, size, _ := runtime.InfoAndDigestAndSize(*img) if info != nil { createdTime = info.Created } params := imagesTemplateParams{ Repository: repository, Tag: tag, ID: imageID, Digest: imageDigest, Created: units.HumanDuration(time.Since((createdTime))) + " ago", Size: units.HumanSizeWithPrecision(float64(size), 3), } imagesOutput = append(imagesOutput, params) } return } // getImagesJSONOutput returns the images information in its raw form func getImagesJSONOutput(runtime *libpod.Runtime, images []*storage.Image) (imagesOutput []imagesJSONParams) { for _, img := range images { createdTime := img.Created info, imageDigest, size, _ := runtime.InfoAndDigestAndSize(*img) if info != nil { createdTime = info.Created } params := imagesJSONParams{ ID: img.ID, Name: img.Names, Digest: imageDigest, Created: createdTime, Size: size, } imagesOutput = append(imagesOutput, params) } return } // generateImagesOutput generates the images based on the format provided func generateImagesOutput(runtime *libpod.Runtime, images []*storage.Image, opts imagesOptions) error { if len(images) == 0 { return nil } var out formats.Writer switch opts.format { case formats.JSONString: imagesOutput := getImagesJSONOutput(runtime, images) out = formats.JSONStructArray{Output: imagesToGeneric([]imagesTemplateParams{}, imagesOutput)} default: imagesOutput := getImagesTemplateOutput(runtime, images, opts) out = formats.StdoutTemplateArray{Output: imagesToGeneric(imagesOutput, []imagesJSONParams{}), Template: opts.format, Fields: imagesOutput[0].headerMap()} } return formats.Writer(out).Out() } // generateImagesFilter returns an ImageFilter based on filterType // to add more filters, define a new case and write what the ImageFilter function should do func generateImagesFilter(params *libpod.ImageFilterParams, filterType string) libpod.ImageFilter { switch filterType { case "label": return func(image *storage.Image, info *types.ImageInspectInfo) bool { if params == nil || params.Label == "" { return true } pair := strings.SplitN(params.Label, "=", 2) if val, ok := info.Labels[pair[0]]; ok { if len(pair) == 2 && val == pair[1] { return true } if len(pair) == 1 { return true } } return false } case "before-image": return func(image *storage.Image, info *types.ImageInspectInfo) bool { if params == nil || params.BeforeImage.IsZero() { return true } return info.Created.Before(params.BeforeImage) } case "since-image": return func(image *storage.Image, info *types.ImageInspectInfo) bool { if params == nil || params.SinceImage.IsZero() { return true } return info.Created.After(params.SinceImage) } case "dangling": return func(image *storage.Image, info *types.ImageInspectInfo) bool { if params == nil || params.Dangling == "" { return true } if common.IsFalse(params.Dangling) && params.ImageName != "" { return true } if common.IsTrue(params.Dangling) && params.ImageName == "" { return true } return false } case "reference": return func(image *storage.Image, info *types.ImageInspectInfo) bool { if params == nil || params.ReferencePattern == "" { return true } return libpod.MatchesReference(params.ImageName, params.ReferencePattern) } case "image-input": return func(image *storage.Image, info *types.ImageInspectInfo) bool { if params == nil || params.ImageInput == "" { return true } return libpod.MatchesReference(params.ImageName, params.ImageInput) } default: fmt.Println("invalid filter type", filterType) return nil } }