1 files changed, 152 insertions, 0 deletions
diff --git a/cmd/podman/images/history.go b/cmd/podman/images/history.go
new file mode 100644
index 000000000..c92072bff
--- /dev/null
+++ b/cmd/podman/images/history.go
@@ -0,0 +1,152 @@
+package images
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+	"text/tabwriter"
+	"text/template"
+	"time"
+	"unicode"
+
+	"github.com/containers/libpod/cmd/podman/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/docker/go-units"
+	jsoniter "github.com/json-iterator/go"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+var (
+	long = `Displays the history of an image.
+
+  The information can be printed out in an easy to read, or user specified format, and can be truncated.`
+
+	// podman _history_
+	historyCmd = &cobra.Command{
+		Use:     "history [flags] IMAGE",
+		Short:   "Show history of a specified image",
+		Long:    long,
+		Example: "podman history quay.io/fedora/fedora",
+		Args:    cobra.ExactArgs(1),
+		RunE:    history,
+	}
+
+	opts = struct {
+		human   bool
+		noTrunc bool
+		quiet   bool
+		format  string
+	}{}
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: historyCmd,
+	})
+
+	flags := historyCmd.Flags()
+	flags.StringVar(&opts.format, "format", "", "Change the output to JSON or a Go template")
+	flags.BoolVarP(&opts.human, "human", "H", true, "Display sizes and dates in human readable format")
+	flags.BoolVar(&opts.noTrunc, "no-trunc", false, "Do not truncate the output")
+	flags.BoolVar(&opts.noTrunc, "notruncate", false, "Do not truncate the output")
+	flags.BoolVarP(&opts.quiet, "quiet", "q", false, "Display the numeric IDs only")
+}
+
+func history(cmd *cobra.Command, args []string) error {
+	results, err := registry.ImageEngine().History(context.Background(), args[0], entities.ImageHistoryOptions{})
+	if err != nil {
+		return err
+	}
+
+	if opts.format == "json" {
+		var err error
+		if len(results.Layers) == 0 {
+			_, err = fmt.Fprintf(os.Stdout, "[]\n")
+		} else {
+			// ah-hoc change to "Created": type and format
+			type layer struct {
+				entities.ImageHistoryLayer
+				Created string `json:"Created"`
+			}
+
+			layers := make([]layer, len(results.Layers))
+			for i, l := range results.Layers {
+				layers[i].ImageHistoryLayer = l
+				layers[i].Created = l.Created.Format(time.RFC3339)
+			}
+			json := jsoniter.ConfigCompatibleWithStandardLibrary
+			enc := json.NewEncoder(os.Stdout)
+			err = enc.Encode(layers)
+		}
+		return err
+	}
+	var hr []historyreporter
+	for _, l := range results.Layers {
+		hr = append(hr, historyreporter{l})
+	}
+	// Defaults
+	hdr := "ID\tCREATED\tCREATED BY\tSIZE\tCOMMENT\n"
+	row := "{{.ID}}\t{{.Created}}\t{{.CreatedBy}}\t{{.Size}}\t{{.Comment}}\n"
+
+	if len(opts.format) > 0 {
+		hdr = ""
+		row = opts.format
+		if !strings.HasSuffix(opts.format, "\n") {
+			row += "\n"
+		}
+	} else {
+		switch {
+		case opts.human:
+			row = "{{.ID}}\t{{.Created}}\t{{.CreatedBy}}\t{{.Size}}\t{{.Comment}}\n"
+		case opts.noTrunc:
+			row = "{{.ID}}\t{{.Created}}\t{{.CreatedBy}}\t{{.Size}}\t{{.Comment}}\n"
+		case opts.quiet:
+			hdr = ""
+			row = "{{.ID}}\n"
+		}
+	}
+	format := hdr + "{{range . }}" + row + "{{end}}"
+
+	tmpl := template.Must(template.New("report").Parse(format))
+	w := tabwriter.NewWriter(os.Stdout, 8, 2, 2, ' ', 0)
+	err = tmpl.Execute(w, hr)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, errors.Wrapf(err, "Failed to print report"))
+	}
+	w.Flush()
+	return nil
+}
+
+type historyreporter struct {
+	entities.ImageHistoryLayer
+}
+
+func (h historyreporter) Created() string {
+	if opts.human {
+		return units.HumanDuration(time.Since(h.ImageHistoryLayer.Created)) + " ago"
+	}
+	return h.ImageHistoryLayer.Created.Format(time.RFC3339)
+}
+
+func (h historyreporter) Size() string {
+	s := units.HumanSizeWithPrecision(float64(h.ImageHistoryLayer.Size), 3)
+	i := strings.LastIndexFunc(s, unicode.IsNumber)
+	return s[:i+1] + " " + s[i+1:]
+}
+
+func (h historyreporter) CreatedBy() string {
+	if len(h.ImageHistoryLayer.CreatedBy) > 45 {
+		return h.ImageHistoryLayer.CreatedBy[:45-3] + "..."
+	}
+	return h.ImageHistoryLayer.CreatedBy
+}
+
+func (h historyreporter) ID() string {
+	if !opts.noTrunc && len(h.ImageHistoryLayer.ID) >= 12 {
+		return h.ImageHistoryLayer.ID[0:12]
+	}
+	return h.ImageHistoryLayer.ID
+}