Add volume prune --filter support

This change adds support for the `--filter` / `?filters` arguments on
the `podman volume prune` subcommand.

  * Adds ParseFilterArgumentsIntoFilters helper for consistent
    Filter string slice handling
  * Adds `--filter` support to podman volume prune cli
  * Adds `?filters...` support to podman volume prune api
  * Updates apiv2 / e2e tests

Closes #8672

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

2 files changed, 26 insertions, 6 deletions

diff --git a/pkg/api/handlers/compat/volumes.go b/pkg/api/handlers/compat/volumes.go
index 71b848932..f76e18ee3 100644
--- a/pkg/api/handlers/compat/volumes.go
+++ b/pkg/api/handlers/compat/volumes.go
@@ -3,6 +3,7 @@ package compat
 import (
 	"encoding/json"
 	"net/http"
+	"net/url"
 	"time"
 
 	"github.com/containers/podman/v2/libpod"
@@ -254,14 +255,15 @@ func PruneVolumes(w http.ResponseWriter, r *http.Request) {
 		utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
 		return
 	}
-	// TODO: We have no ability to pass pruning filters to `PruneVolumes()` so
-	// we'll explicitly reject the request if we see any
-	if len(query.Filters) > 0 {
-		utils.InternalServerError(w, errors.New("filters for pruning volumes is not implemented"))
+
+	f := (url.Values)(query.Filters)
+	filterFuncs, err := filters.GenerateVolumeFilters(f)
+	if err != nil {
+		utils.Error(w, "Something when wrong.", http.StatusBadRequest, errors.Wrapf(err, "failed to parse filters for %s", f.Encode()))
 		return
 	}
 
-	pruned, err := runtime.PruneVolumes(r.Context())
+	pruned, err := runtime.PruneVolumes(r.Context(), filterFuncs)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return
diff --git a/pkg/api/handlers/libpod/volumes.go b/pkg/api/handlers/libpod/volumes.go
index b0d40fd8b..b02a6a8ce 100644
--- a/pkg/api/handlers/libpod/volumes.go
+++ b/pkg/api/handlers/libpod/volumes.go
@@ -3,6 +3,7 @@ package libpod
 import (
 	"encoding/json"
 	"net/http"
+	"net/url"
 
 	"github.com/containers/podman/v2/libpod"
 	"github.com/containers/podman/v2/libpod/define"
@@ -180,8 +181,25 @@ func PruneVolumes(w http.ResponseWriter, r *http.Request) {
 func pruneVolumesHelper(r *http.Request) ([]*entities.VolumePruneReport, error) {
 	var (
 		runtime = r.Context().Value("runtime").(*libpod.Runtime)
+		decoder = r.Context().Value("decoder").(*schema.Decoder)
 	)
-	pruned, err := runtime.PruneVolumes(r.Context())
+	query := struct {
+		Filters map[string][]string `schema:"filters"`
+	}{
+		// override any golang type defaults
+	}
+
+	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
+		return nil, err
+	}
+
+	f := (url.Values)(query.Filters)
+	filterFuncs, err := filters.GenerateVolumeFilters(f)
+	if err != nil {
+		return nil, err
+	}
+
+	pruned, err := runtime.PruneVolumes(r.Context(), filterFuncs)
 	if err != nil {
 		return nil, err
 	}