podman system prune support prune unused networks

This is an enhancement for the podman system prune feature.

In this issue, it is mentioned that 'network prune' should be
wired into 'podman system prune'
https://github.com/containers/podman/issues/8673

Therefore, I add the function to remove unused networks.

Signed-off-by: Toshiki Sonoda <sonoda.toshiki@fujitsu.com>

3 files changed, 36 insertions, 5 deletions

diff --git a/pkg/domain/entities/system.go b/pkg/domain/entities/system.go
index 21026477d..331d2bcdc 100644
--- a/pkg/domain/entities/system.go
+++ b/pkg/domain/entities/system.go
@@ -28,6 +28,7 @@ type SystemPruneReport struct {
 	PodPruneReport        []*PodPruneReport
 	ContainerPruneReports []*reports.PruneReport
 	ImagePruneReports     []*reports.PruneReport
+	NetworkPruneReports   []*reports.PruneReport
 	VolumePruneReports    []*reports.PruneReport
 	ReclaimedSpace        uint64
 }
diff --git a/pkg/domain/infra/abi/network.go b/pkg/domain/infra/abi/network.go
index 47f7917f4..c5f3cf8b3 100644
--- a/pkg/domain/infra/abi/network.go
+++ b/pkg/domain/infra/abi/network.go
@@ -142,7 +142,7 @@ func (ic *ContainerEngine) NetworkExists(ctx context.Context, networkname string
 	}, nil
 }
 
-// Network prune removes unused cni networks
+// Network prune removes unused networks
 func (ic *ContainerEngine) NetworkPrune(ctx context.Context, options entities.NetworkPruneOptions) ([]*entities.NetworkPruneReport, error) {
 	cons, err := ic.Libpod.GetAllContainers()
 	if err != nil {
diff --git a/pkg/domain/infra/abi/system.go b/pkg/domain/infra/abi/system.go
index 762f0d79a..820ba529b 100644
--- a/pkg/domain/infra/abi/system.go
+++ b/pkg/domain/infra/abi/system.go
@@ -137,7 +137,7 @@ func (ic *ContainerEngine) SetupRootless(_ context.Context, noMoveProcess bool)
 	return nil
 }
 
-// SystemPrune removes unused data from the system. Pruning pods, containers, volumes and images.
+// SystemPrune removes unused data from the system. Pruning pods, containers, networks, volumes and images.
 func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.SystemPruneOptions) (*entities.SystemPruneReport, error) {
 	var systemPruneReport = new(entities.SystemPruneReport)
 	filters := []string{}
@@ -148,6 +148,9 @@ func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.Sys
 	found := true
 	for found {
 		found = false
+
+		// TODO: Figure out cleaner way to handle all of the different PruneOptions
+		// Remove all unused pods.
 		podPruneReport, err := ic.prunePodHelper(ctx)
 		if err != nil {
 			return nil, err
@@ -155,9 +158,10 @@ func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.Sys
 		if len(podPruneReport) > 0 {
 			found = true
 		}
+
 		systemPruneReport.PodPruneReport = append(systemPruneReport.PodPruneReport, podPruneReport...)
 
-		// TODO: Figure out cleaner way to handle all of the different PruneOptions
+		// Remove all unused containers.
 		containerPruneOptions := entities.ContainerPruneOptions{}
 		containerPruneOptions.Filters = (url.Values)(options.Filters)
 
@@ -165,16 +169,18 @@ func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.Sys
 		if err != nil {
 			return nil, err
 		}
+
 		reclaimedSpace += reports.PruneReportsSize(containerPruneReports)
 		systemPruneReport.ContainerPruneReports = append(systemPruneReport.ContainerPruneReports, containerPruneReports...)
+
+		// Remove all unused images.
 		imagePruneOptions := entities.ImagePruneOptions{
 			All:    options.All,
 			Filter: filters,
 		}
+
 		imageEngine := ImageEngine{Libpod: ic.Libpod}
 		imagePruneReports, err := imageEngine.Prune(ctx, imagePruneOptions)
-		reclaimedSpace += reports.PruneReportsSize(imagePruneReports)
-
 		if err != nil {
 			return nil, err
 		}
@@ -182,10 +188,33 @@ func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.Sys
 			found = true
 		}
 
+		reclaimedSpace += reports.PruneReportsSize(imagePruneReports)
 		systemPruneReport.ImagePruneReports = append(systemPruneReport.ImagePruneReports, imagePruneReports...)
+
+		// Remove all unused networks.
+		networkPruneOptions := entities.NetworkPruneOptions{}
+		networkPruneOptions.Filters = options.Filters
+
+		networkPruneReport, err := ic.NetworkPrune(ctx, networkPruneOptions)
+		if err != nil {
+			return nil, err
+		}
+		if len(networkPruneReport) > 0 {
+			found = true
+		}
+		for _, net := range networkPruneReport {
+			systemPruneReport.NetworkPruneReports = append(systemPruneReport.NetworkPruneReports, &reports.PruneReport{
+				Id:   net.Name,
+				Err:  net.Error,
+				Size: 0,
+			})
+		}
+
+		// Remove unused volume data.
 		if options.Volume {
 			volumePruneOptions := entities.VolumePruneOptions{}
 			volumePruneOptions.Filters = (url.Values)(options.Filters)
+
 			volumePruneReport, err := ic.VolumePrune(ctx, volumePruneOptions)
 			if err != nil {
 				return nil, err
@@ -193,6 +222,7 @@ func (ic *ContainerEngine) SystemPrune(ctx context.Context, options entities.Sys
 			if len(volumePruneReport) > 0 {
 				found = true
 			}
+
 			reclaimedSpace += reports.PruneReportsSize(volumePruneReport)
 			systemPruneReport.VolumePruneReports = append(systemPruneReport.VolumePruneReports, volumePruneReport...)
 		}