infra: remove dead code

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

pkg/domain/infra/runtime_libpod.go

@@ -294,57 +294,6 @@ func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []strin
 		options.AutoUserNsOpts = *opts
 		return &options, nil
 	}
-	if mode.IsKeepID() {
-		if len(uidMapSlice) > 0 || len(gidMapSlice) > 0 {
-			return nil, errors.New("cannot specify custom mappings with --userns=keep-id")
-		}
-		if len(subUIDMap) > 0 || len(subGIDMap) > 0 {
-			return nil, errors.New("cannot specify subuidmap or subgidmap with --userns=keep-id")
-		}
-		if !rootless.IsRootless() {
-			return nil, errors.New("keep-id is only supported in rootless mode")
-		}
-		min := func(a, b int) int {
-			if a < b {
-				return a
-			}
-			return b
-		}
-
-		uid := rootless.GetRootlessUID()
-		gid := rootless.GetRootlessGID()
-
-		uids, gids, err := rootless.GetConfiguredMappings()
-		if err != nil {
-			return nil, fmt.Errorf("cannot read mappings: %w", err)
-		}
-		maxUID, maxGID := 0, 0
-		for _, u := range uids {
-			maxUID += u.Size
-		}
-		for _, g := range gids {
-			maxGID += g.Size
-		}
-
-		options.UIDMap, options.GIDMap = nil, nil
-
-		options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(uid, maxUID)})
-		options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid, HostID: 0, Size: 1})
-		if maxUID > uid {
-			options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid + 1, HostID: uid + 1, Size: maxUID - uid})
-		}
-
-		options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(gid, maxGID)})
-		options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid, HostID: 0, Size: 1})
-		if maxGID > gid {
-			options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid + 1, HostID: gid + 1, Size: maxGID - gid})
-		}
-
-		options.HostUIDMapping = false
-		options.HostGIDMapping = false
-		// Simply ignore the setting and do not set up an inner namespace for root as it is a no-op
-		return &options, nil
-	}
 
 	if subGIDMap == "" && subUIDMap != "" {
 		subGIDMap = subUIDMap