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|
package images
import (
"context"
"fmt"
"os"
"strings"
"time"
"unicode"
"github.com/containers/common/pkg/report"
"github.com/containers/podman/v3/cmd/podman/common"
"github.com/containers/podman/v3/cmd/podman/registry"
"github.com/containers/podman/v3/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 [options] IMAGE",
Short: "Show history of a specified image",
Long: long,
Args: cobra.ExactArgs(1),
RunE: history,
ValidArgsFunction: common.AutocompleteImages,
Example: "podman history quay.io/fedora/fedora",
}
imageHistoryCmd = &cobra.Command{
Args: historyCmd.Args,
Use: historyCmd.Use,
Short: historyCmd.Short,
Long: historyCmd.Long,
ValidArgsFunction: historyCmd.ValidArgsFunction,
RunE: historyCmd.RunE,
Example: `podman image history quay.io/fedora/fedora`,
}
opts = struct {
human bool
noTrunc bool
quiet bool
format string
}{}
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Command: historyCmd,
})
historyFlags(historyCmd)
registry.Commands = append(registry.Commands, registry.CliCommand{
Command: imageHistoryCmd,
Parent: imageCmd,
})
historyFlags(imageHistoryCmd)
}
func historyFlags(cmd *cobra.Command) {
flags := cmd.Flags()
formatFlagName := "format"
flags.StringVar(&opts.format, formatFlagName, "", "Change the output to JSON or a Go template")
_ = cmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(entities.ImageHistoryLayer{}))
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 report.IsJSON(opts.format) {
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
}
hr := make([]historyReporter, 0, len(results.Layers))
for _, l := range results.Layers {
hr = append(hr, historyReporter{l})
}
hdrs := report.Headers(historyReporter{}, map[string]string{
"CreatedBy": "CREATED BY",
})
// Defaults
row := "{{.ID}}\t{{.Created}}\t{{.CreatedBy}}\t{{.Size}}\t{{.Comment}}\n"
switch {
case cmd.Flags().Changed("format"):
row = report.NormalizeFormat(opts.format)
case opts.quiet:
row = "{{.ID}}\n"
}
format := report.EnforceRange(row)
tmpl, err := report.NewTemplate("history").Parse(format)
if err != nil {
return err
}
w, err := report.NewWriterDefault(os.Stdout)
if err != nil {
return err
}
defer w.Flush()
if !opts.quiet && !cmd.Flags().Changed("format") {
if err := tmpl.Execute(w, hdrs); err != nil {
return errors.Wrapf(err, "failed to write report column headers")
}
}
return tmpl.Execute(w, hr)
}
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 !opts.noTrunc && 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
}
|
