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package main
import (
"reflect"
"strconv"
"strings"
"time"
"github.com/containers/libpod/cmd/podman/formats"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod/image"
units "github.com/docker/go-units"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
const createdByTruncLength = 45
// historyTemplateParams stores info about each layer
type historyTemplateParams struct {
ID string
Created string
CreatedBy string
Size string
Comment string
}
// historyOptions stores cli flag values
type historyOptions struct {
human bool
noTrunc bool
quiet bool
format string
}
var (
historyFlags = []cli.Flag{
cli.BoolTFlag{
Name: "human, H",
Usage: "Display sizes and dates in human readable format",
},
cli.BoolFlag{
Name: "no-trunc, notruncate",
Usage: "Do not truncate the output",
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "Display the numeric IDs only",
},
cli.StringFlag{
Name: "format",
Usage: "Change the output to JSON or a Go template",
},
}
historyDescription = "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."
historyCommand = cli.Command{
Name: "history",
Usage: "Show history of a specified image",
Description: historyDescription,
Flags: historyFlags,
Action: historyCmd,
ArgsUsage: "",
UseShortOptionHandling: true,
}
)
func historyCmd(c *cli.Context) error {
if err := validateFlags(c, historyFlags); err != nil {
return err
}
runtime, err := libpodruntime.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
format := genHistoryFormat(c.String("format"), c.Bool("quiet"))
args := c.Args()
if len(args) == 0 {
return errors.Errorf("an image name must be specified")
}
if len(args) > 1 {
return errors.Errorf("podman history takes at most 1 argument")
}
image, err := runtime.ImageRuntime().NewFromLocal(args[0])
if err != nil {
return err
}
opts := historyOptions{
human: c.BoolT("human"),
noTrunc: c.Bool("no-trunc"),
quiet: c.Bool("quiet"),
format: format,
}
history, err := image.History(getContext())
if err != nil {
return errors.Wrapf(err, "error getting history of image %q", image.InputName)
}
return generateHistoryOutput(history, opts)
}
func genHistoryFormat(format string, quiet bool) string {
if format != "" {
// "\t" from the command line is not being recognized as a tab
// replacing the string "\t" to a tab character if the user passes in "\t"
return strings.Replace(format, `\t`, "\t", -1)
}
if quiet {
return formats.IDString
}
return "table {{.ID}}\t{{.Created}}\t{{.CreatedBy}}\t{{.Size}}\t{{.Comment}}\t"
}
// historyToGeneric makes an empty array of interfaces for output
func historyToGeneric(templParams []historyTemplateParams, JSONParams []*image.History) (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 (h *historyTemplateParams) headerMap() map[string]string {
v := reflect.Indirect(reflect.ValueOf(h))
values := make(map[string]string)
for h := 0; h < v.NumField(); h++ {
key := v.Type().Field(h).Name
value := key
values[key] = strings.ToUpper(splitCamelCase(value))
}
return values
}
// getHistorytemplateOutput gets the modified history information to be printed in human readable format
func getHistoryTemplateOutput(history []*image.History, opts historyOptions) (historyOutput []historyTemplateParams) {
var (
outputSize string
createdTime string
createdBy string
)
for _, hist := range history {
imageID := hist.ID
if !opts.noTrunc && imageID != "<missing>" {
imageID = shortID(imageID)
}
if opts.human {
createdTime = units.HumanDuration(time.Since((*hist.Created))) + " ago"
outputSize = units.HumanSize(float64(hist.Size))
} else {
createdTime = (hist.Created).Format(time.RFC3339)
outputSize = strconv.FormatInt(hist.Size, 10)
}
createdBy = strings.Join(strings.Fields(hist.CreatedBy), " ")
if !opts.noTrunc && len(createdBy) > createdByTruncLength {
createdBy = createdBy[:createdByTruncLength-3] + "..."
}
params := historyTemplateParams{
ID: imageID,
Created: createdTime,
CreatedBy: createdBy,
Size: outputSize,
Comment: hist.Comment,
}
historyOutput = append(historyOutput, params)
}
return
}
// generateHistoryOutput generates the history based on the format given
func generateHistoryOutput(history []*image.History, opts historyOptions) error {
if len(history) == 0 {
return nil
}
var out formats.Writer
switch opts.format {
case formats.JSONString:
out = formats.JSONStructArray{Output: historyToGeneric([]historyTemplateParams{}, history)}
default:
historyOutput := getHistoryTemplateOutput(history, opts)
out = formats.StdoutTemplateArray{Output: historyToGeneric(historyOutput, []*image.History{}), Template: opts.format, Fields: historyOutput[0].headerMap()}
}
return formats.Writer(out).Out()
}
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