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 containers#8658

cmd/podman/system/prune.go

@@ -13,6 +13,7 @@ import (
 	"github.com/containers/podman/v2/cmd/podman/validate"
 	lpfilters "github.com/containers/podman/v2/libpod/filters"
 	"github.com/containers/podman/v2/pkg/domain/entities"
+	"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
 }

cmd/podman/utils/utils.go

@@ -41,21 +41,21 @@ func PrintPodPruneResults(podPruneReports []*entities.PodPruneReport, heading bo
 	return errs.PrintErrors()
 }
 
-func PrintContainerPruneResults(containerPruneReport *entities.ContainerPruneReport, heading bool) error {
+func PrintContainerPruneResults(containerPruneReports []*entities.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 []*entities.PruneReport, heading bool) error {
 	var errs OutputErrors
 	if heading && len(volumePruneReport) > 0 {
 		fmt.Println("Deleted Volumes")
@@ -70,18 +70,16 @@ 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 []*entities.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
 }

libpod/image/prune.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/containers/podman/v2/libpod/events"
+	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/containers/podman/v2/pkg/timetype"
 	"github.com/containers/storage"
 	"github.com/pkg/errors"
@@ -110,7 +111,8 @@ func (ir *Runtime) GetPruneImages(ctx context.Context, all bool, filterFuncs []I
 
 // PruneImages prunes dangling and optionally all unused images from the local
 // image store
-func (ir *Runtime) PruneImages(ctx context.Context, all bool, filter []string) ([]string, error) {
+func (ir *Runtime) PruneImages(ctx context.Context, all bool, filter []string) ([]*entities.PruneReport, error) {
+	reports := make([]*entities.PruneReport, 0)
 	filterFuncs := make([]ImageFilter, 0, len(filter))
 	for _, f := range filter {
 		filterSplit := strings.SplitN(f, "=", 2)
@@ -125,7 +127,6 @@ func (ir *Runtime) PruneImages(ctx context.Context, all bool, filter []string) (
 		filterFuncs = append(filterFuncs, generatedFunc)
 	}
 
-	pruned := []string{}
 	prev := 0
 	for {
 		toPrune, err := ir.GetPruneImages(ctx, all, filterFuncs)
@@ -143,6 +144,13 @@ func (ir *Runtime) PruneImages(ctx context.Context, all bool, filter []string) (
 			if err != nil {
 				return nil, err
 			}
+			nameOrID := img.ID()
+			s, err := img.Size(ctx)
+			imgSize := *s
+			if err != nil {
+				logrus.Warnf("Failed to collect image size for: %s, %s", nameOrID, err)
+				imgSize = 0
+			}
 			if err := img.Remove(ctx, false); err != nil {
 				if errors.Cause(err) == storage.ErrImageUsedByContainer {
 					logrus.Warnf("Failed to prune image %s as it is in use: %v.\nA container associated with containers/storage (e.g., Buildah, CRI-O, etc.) maybe associated with this image.\nUsing the rmi command with the --force option will remove the container and image, but may cause failures for other dependent systems.", img.ID(), err)
@@ -151,13 +159,18 @@ func (ir *Runtime) PruneImages(ctx context.Context, all bool, filter []string) (
 				return nil, errors.Wrap(err, "failed to prune image")
 			}
 			defer img.newImageEvent(events.Prune)
-			nameOrID := img.ID()
+
 			if len(repotags) > 0 {
 				nameOrID = repotags[0]
 			}
-			pruned = append(pruned, nameOrID)
+
+			reports = append(reports, &entities.PruneReport{
+				Id:   nameOrID,
+				Err:  nil,
+				Size: uint64(imgSize),
+			})
 		}
 
 	}
-	return pruned, nil
+	return reports, nil
 }

libpod/runtime_ctr.go

@@ -14,6 +14,7 @@ import (
 	"github.com/containers/podman/v2/libpod/events"
 	"github.com/containers/podman/v2/libpod/shutdown"
 	"github.com/containers/podman/v2/pkg/cgroups"
+	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/containers/podman/v2/pkg/rootless"
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/stringid"
@@ -884,9 +885,8 @@ func (r *Runtime) GetExecSessionContainer(id string) (*Container, error) {
 
 // PruneContainers removes stopped and exited containers from localstorage.  A set of optional filters
 // can be provided to be more granular.
-func (r *Runtime) PruneContainers(filterFuncs []ContainerFilter) (map[string]int64, map[string]error, error) {
-	pruneErrors := make(map[string]error)
-	prunedContainers := make(map[string]int64)
+func (r *Runtime) PruneContainers(filterFuncs []ContainerFilter) ([]*entities.PruneReport, error) {
+	reports := make([]*entities.PruneReport, 0)
 	// We add getting the exited and stopped containers via a filter
 	containerStateFilter := func(c *Container) bool {
 		if c.PodID() != "" {
@@ -906,23 +906,28 @@ func (r *Runtime) PruneContainers(filterFuncs []ContainerFilter) (map[string]int
 	filterFuncs = append(filterFuncs, containerStateFilter)
 	delContainers, err := r.GetContainers(filterFuncs...)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	for _, c := range delContainers {
-		ctr := c
-		size, err := ctr.RWSize()
+		report := new(entities.PruneReport)
+		report.Id = c.ID()
+		report.Err = nil
+		report.Size = 0
+		size, err := c.RWSize()
 		if err != nil {
-			pruneErrors[ctr.ID()] = err
+			report.Err = err
+			reports = append(reports, report)
 			continue
 		}
-		err = r.RemoveContainer(context.Background(), ctr, false, false)
+		err = r.RemoveContainer(context.Background(), c, false, false)
 		if err != nil {
-			pruneErrors[ctr.ID()] = err
+			report.Err = err
 		} else {
-			prunedContainers[ctr.ID()] = size
+			report.Size = (uint64)(size)
 		}
+		reports = append(reports, report)
 	}
-	return prunedContainers, pruneErrors, nil
+	return reports, nil
 }
 
 // MountStorageContainer mounts the storage container's root filesystem

libpod/runtime_volume.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/containers/podman/v2/libpod/define"
 	"github.com/containers/podman/v2/libpod/events"
+	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/pkg/errors"
 )
 
@@ -133,22 +134,30 @@ func (r *Runtime) GetAllVolumes() ([]*Volume, error) {
 }
 
 // PruneVolumes removes unused volumes from the system
-func (r *Runtime) PruneVolumes(ctx context.Context, filterFuncs []VolumeFilter) (map[string]error, error) {
-	reports := make(map[string]error)
+func (r *Runtime) PruneVolumes(ctx context.Context, filterFuncs []VolumeFilter) ([]*entities.PruneReport, error) {
+	reports := make([]*entities.PruneReport, 0)
 	vols, err := r.Volumes(filterFuncs...)
 	if err != nil {
 		return nil, err
 	}
 
 	for _, vol := range vols {
+		report := new(entities.PruneReport)
+		volSize, err := vol.Size()
+		if err != nil {
+			volSize = 0
+		}
+		report.Size = volSize
+		report.Id = vol.Name()
 		if err := r.RemoveVolume(ctx, vol, false); err != nil {
 			if errors.Cause(err) != define.ErrVolumeBeingUsed && errors.Cause(err) != define.ErrVolumeRemoved {
-				reports[vol.Name()] = err
+				report.Err = err
 			}
-			continue
+		} else {
+			vol.newVolumeEvent(events.Prune)
 		}
-		vol.newVolumeEvent(events.Prune)
-		reports[vol.Name()] = nil
+		report.Err = nil
+		reports = append(reports, report)
 	}
 	return reports, nil
 }

libpod/volume.go

@@ -1,6 +1,8 @@
 package libpod
 
 import (
+	"os"
+	"path/filepath"
 	"time"
 
 	"github.com/containers/podman/v2/libpod/define"
@@ -79,6 +81,18 @@ func (v *Volume) Name() string {
 	return v.config.Name
 }
 
+// Returns the size on disk of volume
+func (v *Volume) Size() (uint64, error) {
+	var size uint64
+	err := filepath.Walk(v.config.MountPoint, func(path string, info os.FileInfo, err error) error {
+		if err == nil && !info.IsDir() {
+			size += (uint64)(info.Size())
+		}
+		return err
+	})
+	return size, err
+}
+
 // Driver retrieves the volume's driver.
 func (v *Volume) Driver() string {
 	return v.config.Driver

pkg/api/handlers/compat/containers_prune.go

@@ -7,16 +7,11 @@ import (
 	lpfilters "github.com/containers/podman/v2/libpod/filters"
 	"github.com/containers/podman/v2/pkg/api/handlers/utils"
 	"github.com/containers/podman/v2/pkg/domain/entities"
-	"github.com/docker/docker/api/types"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
 )
 
 func PruneContainers(w http.ResponseWriter, r *http.Request) {
-	var (
-		delContainers []string
-		space         int64
-	)
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 	decoder := r.Context().Value("decoder").(*schema.Decoder)
 
@@ -49,36 +44,21 @@ func PruneContainers(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	prunedContainers, pruneErrors, err := runtime.PruneContainers(filterFuncs)
+	report, err := runtime.PruneContainers(filterFuncs)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return
 	}
-	for ctrID, size := range prunedContainers {
-		if pruneErrors[ctrID] == nil {
-			space += size
-			delContainers = append(delContainers, ctrID)
-		}
-	}
-	report := types.ContainersPruneReport{
-		ContainersDeleted: delContainers,
-		SpaceReclaimed:    uint64(space),
-	}
 	utils.WriteResponse(w, http.StatusOK, report)
 }
 
 func PruneContainersHelper(w http.ResponseWriter, r *http.Request, filterFuncs []libpod.ContainerFilter) (
-	*entities.ContainerPruneReport, error) {
+	[]*entities.PruneReport, error) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
-	prunedContainers, pruneErrors, err := runtime.PruneContainers(filterFuncs)
+	reports, err := runtime.PruneContainers(filterFuncs)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return nil, err
 	}
-
-	report := &entities.ContainerPruneReport{
-		Err: pruneErrors,
-		ID:  prunedContainers,
-	}
-	return report, nil
+	return reports, nil
 }

pkg/api/handlers/compat/images.go

@@ -99,21 +99,23 @@ func PruneImages(w http.ResponseWriter, r *http.Request) {
 			filters = append(filters, fmt.Sprintf("%s=%s", k, val))
 		}
 	}
-	pruneCids, err := runtime.ImageRuntime().PruneImages(r.Context(), query.All, filters)
+	imagePruneReports, err := runtime.ImageRuntime().PruneImages(r.Context(), query.All, filters)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return
 	}
-	for _, p := range pruneCids {
+	reclaimedSpace := uint64(0)
+	for _, p := range imagePruneReports {
 		idr = append(idr, types.ImageDeleteResponseItem{
-			Deleted: p,
+			Deleted: p.Id,
 		})
+		reclaimedSpace = reclaimedSpace + p.Size
 	}
 
 	// FIXME/TODO to do this exactly correct, pruneimages needs to return idrs and space-reclaimed, then we are golden
 	ipr := types.ImagesPruneReport{
 		ImagesDeleted:  idr,
-		SpaceReclaimed: 1, // TODO we cannot supply this right now
+		SpaceReclaimed: reclaimedSpace,
 	}
 	utils.WriteResponse(w, http.StatusOK, handlers.ImagesPruneReport{ImagesPruneReport: ipr})
 }

pkg/api/handlers/compat/volumes.go

@@ -269,9 +269,9 @@ func PruneVolumes(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	prunedIds := make([]string, 0, len(pruned))
-	for k := range pruned {
+	for _, v := range pruned {
 		// XXX: This drops any pruning per-volume error messages on the floor
-		prunedIds = append(prunedIds, k)
+		prunedIds = append(prunedIds, v.Id)
 	}
 	pruneResponse := docker_api_types.VolumesPruneReport{
 		VolumesDeleted: prunedIds,

pkg/api/handlers/libpod/images.go

@@ -156,12 +156,12 @@ func PruneImages(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	cids, err := runtime.ImageRuntime().PruneImages(r.Context(), query.All, libpodFilters)
+	imagePruneReports, err := runtime.ImageRuntime().PruneImages(r.Context(), query.All, libpodFilters)
 	if err != nil {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
 		return
 	}
-	utils.WriteResponse(w, http.StatusOK, cids)
+	utils.WriteResponse(w, http.StatusOK, imagePruneReports)
 }
 
 func ExportImage(w http.ResponseWriter, r *http.Request) {