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|
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"
"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)
}
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
}
|
