Merge pull request #10836 from Luap99/diff

podman diff accept two images or containers

1 files changed, 79 insertions, 0 deletions

diff --git a/cmd/podman/diff/diff.go b/cmd/podman/diff/diff.go
new file mode 100644
index 000000000..81bbb6c43
--- /dev/null
+++ b/cmd/podman/diff/diff.go
@@ -0,0 +1,79 @@
+package diff
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/containers/common/pkg/report"
+	"github.com/containers/podman/v3/cmd/podman/registry"
+	"github.com/containers/podman/v3/pkg/domain/entities"
+	"github.com/docker/docker/pkg/archive"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+func Diff(cmd *cobra.Command, args []string, options entities.DiffOptions) error {
+	results, err := registry.ContainerEngine().Diff(registry.GetContext(), args, options)
+	if err != nil {
+		return err
+	}
+
+	switch {
+	case report.IsJSON(options.Format):
+		return changesToJSON(results)
+	case options.Format == "":
+		return changesToTable(results)
+	default:
+		return errors.New("only supported value for '--format' is 'json'")
+	}
+}
+
+type ChangesReportJSON struct {
+	Changed []string `json:"changed,omitempty"`
+	Added   []string `json:"added,omitempty"`
+	Deleted []string `json:"deleted,omitempty"`
+}
+
+func changesToJSON(diffs *entities.DiffReport) error {
+	body := ChangesReportJSON{}
+	for _, row := range diffs.Changes {
+		switch row.Kind {
+		case archive.ChangeAdd:
+			body.Added = append(body.Added, row.Path)
+		case archive.ChangeDelete:
+			body.Deleted = append(body.Deleted, row.Path)
+		case archive.ChangeModify:
+			body.Changed = append(body.Changed, row.Path)
+		default:
+			return errors.Errorf("output kind %q not recognized", row.Kind)
+		}
+	}
+
+	// Pull in configured json library
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "     ")
+	return enc.Encode(body)
+}
+
+func changesToTable(diffs *entities.DiffReport) error {
+	for _, row := range diffs.Changes {
+		fmt.Fprintln(os.Stdout, row.String())
+	}
+	return nil
+}
+
+// IDOrLatestArgs used to validate a nameOrId was provided or the "--latest" flag
+func ValidateContainerDiffArgs(cmd *cobra.Command, args []string) error {
+	given, _ := cmd.Flags().GetBool("latest")
+	if len(args) > 0 && !given {
+		return cobra.RangeArgs(1, 2)(cmd, args)
+	}
+	if len(args) > 0 && given {
+		return errors.New("--latest and containers cannot be used together")
+	}
+	if len(args) == 0 && !given {
+		return errors.Errorf("%q requires a name, id, or the \"--latest\" flag", cmd.CommandPath())
+	}
+	return nil
+}