Fix inconsistencies between --all and --filter=all in volume prune

Signed-off-by: Šimon Brauner <sbrauner@redhat.com>

Author: simonbrauner

cmd/podman/volumes/prune.go

@@ -3,6 +3,7 @@ package volumes
 import (
 	"bufio"
 	"context"
+	"errors"
 	"fmt"
 	"os"
 	"strings"
@@ -64,6 +65,11 @@ func prune(cmd *cobra.Command, _ []string) error {
 
 	// --all adds filter all=true (Docker-compatible; behavior is filter-only)
 	allFlag, _ := cmd.Flags().GetBool("all")
+	filterAllFlag := strings.EqualFold(pruneOptions.Filters.Get("all"), "true")
+	if allFlag && filterAllFlag {
+		return errors.New("--all and --filter all cannot be used together")
+	}
+	allFlag = allFlag || filterAllFlag
 	if allFlag {
 		pruneOptions.Filters.Set("all", "true")
 	}
@@ -79,6 +85,7 @@ func prune(cmd *cobra.Command, _ []string) error {
 		if err != nil {
 			return err
 		}
+		delete(listOptions.Filter, "all") // list does not support --filter all
 		filteredVolumes, err := registry.ContainerEngine().VolumeList(context.Background(), listOptions)
 		if err != nil {
 			return err

test/e2e/volume_prune_test.go

@@ -42,6 +42,14 @@ var _ = Describe("Podman volume prune", func() {
 		Expect(session.OutputToString()).To(ContainSubstring("named_vol"))
 	})
 
+	It("podman volume prune --all removes all unused volumes", func() {
+		podmanTest.PodmanExitCleanly("volume", "create", "prune_all_test")
+		podmanTest.PodmanExitCleanly("volume", "prune", "--all", "--force")
+
+		session := podmanTest.PodmanExitCleanly("volume", "ls")
+		Expect(session.OutputToStringArray()).To(HaveLen(1))
+	})
+
 	It("podman volume prune --filter all=true removes all unused volumes", func() {
 		podmanTest.PodmanExitCleanly("volume", "create", "prune_filter_all_test")
 		podmanTest.PodmanExitCleanly("volume", "prune", "--filter", "all=true", "--force")
@@ -50,6 +58,10 @@ var _ = Describe("Podman volume prune", func() {
 		Expect(session.OutputToStringArray()).To(HaveLen(1))
 	})
 
+	It("podman volume prune --filter all=true does not crash without --force", func() {
+		podmanTest.PodmanExitCleanly("volume", "prune", "--filter", "all=true")
+	})
+
 	It("podman prune volume --filter until", func() {
 		podmanTest.PodmanExitCleanly("volume", "create", "--label", "label1=value1", "myvol1")