Rework pruning to report reclaimed space

This change adds code to report the reclaimed space after a prune.
Reclaimed space from volumes, images, and containers is recorded
during the prune call in a PruneReport struct. These structs are
collected into a slice during a system prune and processed afterwards
to calculate the total reclaimed space.

Closes #8658

Signed-off-by: Baron Lenardson <lenardson.baron@gmail.com>

2 files changed, 27 insertions, 21 deletions

diff --git a/cmd/podman/system/prune.go b/cmd/podman/system/prune.go
index 93b4a1157..87bb947ed 100644
--- a/cmd/podman/system/prune.go
+++ b/cmd/podman/system/prune.go
@@ -13,6 +13,7 @@ import (
 	"github.com/containers/podman/v2/cmd/podman/validate"
 	"github.com/containers/podman/v2/pkg/domain/entities"
 	dfilters "github.com/containers/podman/v2/pkg/domain/filters"
+	"github.com/docker/go-units"
 	"github.com/spf13/cobra"
 )
 
@@ -90,7 +91,7 @@ Are you sure you want to continue? [y/N] `, volumeString)
 		return err
 	}
 	// Print container prune results
-	err = utils.PrintContainerPruneResults(response.ContainerPruneReport, true)
+	err = utils.PrintContainerPruneResults(response.ContainerPruneReports, true)
 	if err != nil {
 		return err
 	}
@@ -101,11 +102,17 @@ Are you sure you want to continue? [y/N] `, volumeString)
 	}
 	// Print Volume prune results
 	if pruneOptions.Volume {
-		err = utils.PrintVolumePruneResults(response.VolumePruneReport, true)
+		err = utils.PrintVolumePruneResults(response.VolumePruneReports, true)
 		if err != nil {
 			return err
 		}
 	}
 	// Print Images prune results
-	return utils.PrintImagePruneResults(response.ImagePruneReport, true)
+	err = utils.PrintImagePruneResults(response.ImagePruneReports, true)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("Total reclaimed space: %s\n", units.HumanSize((float64)(response.ReclaimedSpace)))
+	return nil
 }
diff --git a/cmd/podman/utils/utils.go b/cmd/podman/utils/utils.go
index 2ca2c4c92..f42243f69 100644
--- a/cmd/podman/utils/utils.go
+++ b/cmd/podman/utils/utils.go
@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"github.com/containers/podman/v2/pkg/domain/entities"
+	"github.com/containers/podman/v2/pkg/domain/entities/reports"
 )
 
 // IsDir returns true if the specified path refers to a directory.
@@ -41,21 +42,21 @@ func PrintPodPruneResults(podPruneReports []*entities.PodPruneReport, heading bo
 	return errs.PrintErrors()
 }
 
-func PrintContainerPruneResults(containerPruneReport *entities.ContainerPruneReport, heading bool) error {
+func PrintContainerPruneResults(containerPruneReports []*reports.PruneReport, heading bool) error {
 	var errs OutputErrors
-	if heading && (len(containerPruneReport.ID) > 0 || len(containerPruneReport.Err) > 0) {
+	if heading && (len(containerPruneReports) > 0) {
 		fmt.Println("Deleted Containers")
 	}
-	for k := range containerPruneReport.ID {
-		fmt.Println(k)
-	}
-	for _, v := range containerPruneReport.Err {
-		errs = append(errs, v)
+	for _, v := range containerPruneReports {
+		fmt.Println(v.Id)
+		if v.Err != nil {
+			errs = append(errs, v.Err)
+		}
 	}
 	return errs.PrintErrors()
 }
 
-func PrintVolumePruneResults(volumePruneReport []*entities.VolumePruneReport, heading bool) error {
+func PrintVolumePruneResults(volumePruneReport []*reports.PruneReport, heading bool) error {
 	var errs OutputErrors
 	if heading && len(volumePruneReport) > 0 {
 		fmt.Println("Deleted Volumes")
@@ -70,18 +71,16 @@ func PrintVolumePruneResults(volumePruneReport []*entities.VolumePruneReport, he
 	return errs.PrintErrors()
 }
 
-func PrintImagePruneResults(imagePruneReport *entities.ImagePruneReport, heading bool) error {
-	if heading && (len(imagePruneReport.Report.Id) > 0 || len(imagePruneReport.Report.Err) > 0) {
+func PrintImagePruneResults(imagePruneReports []*reports.PruneReport, heading bool) error {
+	if heading {
 		fmt.Println("Deleted Images")
 	}
-	for _, i := range imagePruneReport.Report.Id {
-		fmt.Println(i)
-	}
-	for _, e := range imagePruneReport.Report.Err {
-		fmt.Fprint(os.Stderr, e.Error()+"\n")
-	}
-	if imagePruneReport.Size > 0 {
-		fmt.Fprintf(os.Stdout, "Size: %d\n", imagePruneReport.Size)
+	for _, r := range imagePruneReports {
+		fmt.Println(r.Id)
+		if r.Err != nil {
+			fmt.Fprint(os.Stderr, r.Err.Error()+"\n")
+		}
 	}
+
 	return nil
 }