package main import ( "fmt" "github.com/containers/buildah/pkg/formats" "github.com/containers/libpod/cmd/podman/cliconfig" "github.com/containers/libpod/pkg/adapter" "github.com/containers/storage/pkg/archive" "github.com/pkg/errors" "github.com/spf13/cobra" ) 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 ( diffCommand cliconfig.DiffValues diffDescription = fmt.Sprint(`Displays changes on a container or image's filesystem. The container or image will be compared to its parent layer.`) _diffCommand = &cobra.Command{ Use: "diff [flags] CONTAINER | IMAGE", Short: "Inspect changes on container's file systems", Long: diffDescription, RunE: func(cmd *cobra.Command, args []string) error { diffCommand.InputArgs = args diffCommand.GlobalFlags = MainGlobalOpts return diffCmd(&diffCommand) }, Example: `podman diff imageID podman diff ctrID podman diff --format json redis:alpine`, } ) func init() { diffCommand.Command = _diffCommand diffCommand.SetHelpTemplate(HelpTemplate()) diffCommand.SetUsageTemplate(UsageTemplate()) flags := diffCommand.Flags() flags.BoolVar(&diffCommand.Archive, "archive", true, "Save the diff as a tar archive") flags.StringVar(&diffCommand.Format, "format", "", "Change the output format") flags.MarkHidden("archive") } 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 *cliconfig.DiffValues) error { if len(c.InputArgs) != 1 { return errors.Errorf("container, image, or layer name must be specified: podman diff [options [...]] ID-NAME") } runtime, err := adapter.GetRuntime(&c.PodmanCommand) if err != nil { return errors.Wrapf(err, "could not get runtime") } defer runtime.Shutdown(false) to := c.InputArgs[0] changes, err := runtime.Diff(c, to) if err != nil { return errors.Wrapf(err, "could not get changes for %q", to) } diffOutput := []diffOutputParams{} outputFormat := c.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 }