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package main
import (
"fmt"
"github.com/containers/libpod/cmd/podman/formats"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/storage/pkg/archive"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
type diffJSONOutput struct {
Changed []string `json:"changed,omitempty"`
Added []string `json:"added,omitempty"`
Deleted []string `json:"deleted,omitempty"`
}
type diffOutputParams struct {
Change archive.ChangeType
Path string
}
type stdoutStruct struct {
output []diffOutputParams
}
func (so stdoutStruct) Out() error {
for _, d := range so.output {
fmt.Printf("%s %s\n", d.Change, d.Path)
}
return nil
}
var (
diffFlags = []cli.Flag{
cli.BoolFlag{
Name: "archive",
Usage: "Save the diff as a tar archive",
Hidden: true,
},
cli.StringFlag{
Name: "format",
Usage: "Change the output format.",
},
}
diffDescription = fmt.Sprint(`Displays changes on a container or image's filesystem. The
container or image will be compared to its parent layer`)
diffCommand = cli.Command{
Name: "diff",
Usage: "Inspect changes on container's file systems",
Description: diffDescription,
Flags: diffFlags,
Action: diffCmd,
ArgsUsage: "ID-NAME",
OnUsageError: usageErrorHandler,
}
)
func formatJSON(output []diffOutputParams) (diffJSONOutput, error) {
jsonStruct := diffJSONOutput{}
for _, output := range output {
switch output.Change {
case archive.ChangeModify:
jsonStruct.Changed = append(jsonStruct.Changed, output.Path)
case archive.ChangeAdd:
jsonStruct.Added = append(jsonStruct.Added, output.Path)
case archive.ChangeDelete:
jsonStruct.Deleted = append(jsonStruct.Deleted, output.Path)
default:
return jsonStruct, errors.Errorf("output kind %q not recognized", output.Change.String())
}
}
return jsonStruct, nil
}
func diffCmd(c *cli.Context) error {
if err := validateFlags(c, diffFlags); err != nil {
return err
}
if len(c.Args()) != 1 {
return errors.Errorf("container, image, or layer name must be specified: podman diff [options [...]] ID-NAME")
}
runtime, err := libpodruntime.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
to := c.Args().Get(0)
changes, err := runtime.GetDiff("", to)
if err != nil {
return errors.Wrapf(err, "could not get changes for %q", to)
}
diffOutput := []diffOutputParams{}
outputFormat := c.String("format")
for _, change := range changes {
params := diffOutputParams{
Change: change.Kind,
Path: change.Path,
}
diffOutput = append(diffOutput, params)
}
var out formats.Writer
if outputFormat != "" {
switch outputFormat {
case formats.JSONString:
data, err := formatJSON(diffOutput)
if err != nil {
return err
}
out = formats.JSONStruct{Output: data}
default:
return errors.New("only valid format for diff is 'json'")
}
} else {
out = stdoutStruct{output: diffOutput}
}
formats.Writer(out).Out()
return nil
}
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