move prune filter parsing to common

there was some eerily similar code in c/common and in podman for
creating filter functions for various types. Move some of it here
and add support for the label!= filter in libnetwork only. Libimage already supports it.

after this merges, will file a PR with the fix for containers within podman as well

see containers/podman#14182

Signed-off-by: Charlie Doern <[email protected]>

libimage/filters.go

@@ -160,7 +160,6 @@ func (r *Runtime) compileImageFilters(ctx context.Context, options *ListImagesOp
 
 		case "label":
 			filter = filterLabel(ctx, value)
-
 		case "readonly":
 			readOnly, err := r.bool(duplicate, key, value)
 			if err != nil {

libnetwork/util/filters.go

@@ -65,7 +65,10 @@ func createPruneFilterFuncs(key string, filterValues []string) (types.FilterFunc
 		return func(net types.Network) bool {
 			return filters.MatchLabelFilters(filterValues, net.Labels)
 		}, nil
-
+	case "label!":
+		return func(net types.Network) bool {
+			return !filters.MatchLabelFilters(filterValues, net.Labels)
+		}, nil
 	case "until":
 		until, err := filters.ComputeUntilTimestamp(filterValues)
 		if err != nil {

libnetwork/util/filters_test.go

@@ -0,0 +1,47 @@
+package util
+
+import "testing"
+
+func TestGenerateFilterFunc(t *testing.T) {
+	testValues := []string{
+		"",
+		"test",
+		"",
+	}
+	type args struct {
+		keys   []string
+		labels []string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "Match when all filters the same as labels",
+			args: args{
+				keys:   []string{"label", "label", "label"},
+				labels: testValues,
+			},
+			want: true,
+		},
+		{
+			name: "Match with inverse",
+			args: args{
+				keys:   []string{"label", "label", "label!"},
+				labels: testValues,
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			for _, entry := range tt.args.keys {
+				if _, err := createFilterFuncs(entry, tt.args.labels); err != nil {
+					t.Errorf("createPruneFilterFuncs() failed on %s with entry %s: %s", tt.name, entry, err.Error())
+				}
+			}
+		})
+	}
+}

pkg/filters/filters.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -112,11 +113,24 @@ outer:
 			filterValue = ""
 		}
 		for labelKey, labelValue := range labels {
-			if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
-				continue outer
+			if filterValue == "" || labelValue == filterValue {
+				if labelKey == filterKey || matchPattern(filterKey, labelKey) {
+					continue outer
+				}
 			}
 		}
 		return false
 	}
 	return true
 }
+
+func matchPattern(pattern string, value string) bool {
+	if strings.Contains(pattern, "*") {
+		filter := fmt.Sprintf("*%s*", pattern)
+		filter = strings.ReplaceAll(filter, string(filepath.Separator), "|")
+		newName := strings.ReplaceAll(value, string(filepath.Separator), "|")
+		match, _ := filepath.Match(filter, newName)
+		return match
+	}
+	return false
+}