Add support for volume prune until filter to http api

As stated in #10579 docker silently implements until filter for volume prune.
This commit adds initial support to the HTTP API, both libpod and compat.
It enables further work on that issue, such as adding cli support in the future.

Signed-off-by: Jakub Guzik <jakubmguzik@gmail.com>

2 files changed, 17 insertions, 4 deletions

diff --git a/pkg/api/server/register_volumes.go b/pkg/api/server/register_volumes.go
index e5d6cf195..d58bf0662 100644
--- a/pkg/api/server/register_volumes.go
+++ b/pkg/api/server/register_volumes.go
@@ -88,7 +88,8 @@ func (s *APIServer) registerVolumeHandlers(r *mux.Router) error {
 	//    description: |
 	//      JSON encoded value of filters (a map[string][]string) to match volumes against before pruning.
 	//      Available filters:
-	//	      - label (label=<key>, label=<key>=<value>, label!=<key>, or label!=<key>=<value>) Prune volumes with (or without, in case label!=... is used) the specified labels.
+	//        - `until=<timestamp>` Prune volumes created before this timestamp. The `<timestamp>` can be Unix timestamps, date formatted timestamps, or Go duration strings (e.g. `10m`, `1h30m`) computed relative to the daemon machine’s time.
+	//        - `label` (`label=<key>`, `label=<key>=<value>`, `label!=<key>`, or `label!=<key>=<value>`) Prune volumes with (or without, in case `label!=...` is used) the specified labels.
 	// responses:
 	//   '200':
 	//      "$ref": "#/responses/VolumePruneResponse"
@@ -268,7 +269,8 @@ func (s *APIServer) registerVolumeHandlers(r *mux.Router) error {
 	//    description: |
 	//      JSON encoded value of filters (a map[string][]string) to match volumes against before pruning.
 	//      Available filters:
-	//	      - label (label=<key>, label=<key>=<value>, label!=<key>, or label!=<key>=<value>) Prune volumes with (or without, in case label!=... is used) the specified labels.
+	//        - `until=<timestamp>` Prune volumes created before this timestamp. The `<timestamp>` can be Unix timestamps, date formatted timestamps, or Go duration strings (e.g. `10m`, `1h30m`) computed relative to the daemon machine’s time.
+	//        - `label` (`label=<key>`, `label=<key>=<value>`, `label!=<key>`, or `label!=<key>=<value>`) Prune volumes with (or without, in case `label!=...` is used) the specified labels.
 	// responses:
 	//   '200':
 	//      "$ref": "#/responses/DockerVolumePruneResponse"
diff --git a/pkg/domain/filters/volumes.go b/pkg/domain/filters/volumes.go
index 9a08adf82..df23c31c0 100644
--- a/pkg/domain/filters/volumes.go
+++ b/pkg/domain/filters/volumes.go
@@ -86,11 +86,22 @@ func GeneratePruneVolumeFilters(filters url.Values) ([]libpod.VolumeFilter, erro
 	var vf []libpod.VolumeFilter
 	for filter, v := range filters {
 		for _, val := range v {
+			filterVal := val
 			switch filter {
 			case "label":
-				filter := val
 				vf = append(vf, func(v *libpod.Volume) bool {
-					return util.MatchLabelFilters([]string{filter}, v.Labels())
+					return util.MatchLabelFilters([]string{filterVal}, v.Labels())
+				})
+			case "until":
+				until, err := util.ComputeUntilTimestamp([]string{filterVal})
+				if err != nil {
+					return nil, err
+				}
+				vf = append(vf, func(v *libpod.Volume) bool {
+					if !until.IsZero() && v.CreatedTime().Before(until) {
+						return true
+					}
+					return false
 				})
 			default:
 				return nil, errors.Errorf("%q is an invalid volume filter", filter)