builder: add worker gc policies and labels

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

builder/driver.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/buildx/util/dockerutil"
 	"github.com/docker/buildx/util/imagetools"
 	"github.com/docker/buildx/util/platformutil"
+	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/util/grpcerrors"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -23,6 +24,8 @@ type Driver struct {
 	Driver      driver.Driver
 	Info        *driver.Info
 	Platforms   []ocispecs.Platform
+	GCPolicy    []client.PruneInfo
+	Labels      map[string]string
 	ImageOpt    imagetools.Opt
 	ProxyConfig map[string]string
 	Version     string
@@ -206,8 +209,12 @@ func (d *Driver) loadData(ctx context.Context) error {
 		if err != nil {
 			return errors.Wrap(err, "listing workers")
 		}
-		for _, w := range workers {
+		for idx, w := range workers {
 			d.Platforms = append(d.Platforms, w.Platforms...)
+			if idx == 0 {
+				d.GCPolicy = w.GCPolicy
+				d.Labels = w.Labels
+			}
 		}
 		d.Platforms = platformutil.Dedupe(d.Platforms)
 		inf, err := driverClient.Info(ctx)

commands/inspect.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"sort"
 	"strings"
 	"text/tabwriter"
 	"time"
@@ -12,6 +13,7 @@ import (
 	"github.com/docker/buildx/util/platformutil"
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
+	"github.com/docker/go-units"
 	"github.com/moby/buildkit/util/appcontext"
 	"github.com/spf13/cobra"
 )
@@ -84,7 +86,27 @@ func runInspect(dockerCli command.Cli, in inspectOptions) error {
 					fmt.Fprintf(w, "Flags:\t%s\n", strings.Join(n.Flags, " "))
 				}
 				if drivers[i].Version != "" {
-					fmt.Fprintf(w, "Buildkit:\t%s\n", drivers[i].Version)
+					fmt.Fprintf(w, "BuildKit:\t%s\n", drivers[i].Version)
+				}
+				if len(drivers[i].Labels) > 0 {
+					fmt.Fprintf(w, "Labels:\n")
+					for _, k := range sortedKeys(drivers[i].Labels) {
+						v := drivers[i].Labels[k]
+						fmt.Fprintf(w, "\t%s:\t%s\n", k, v)
+					}
+				}
+				for ri, rule := range drivers[i].GCPolicy {
+					fmt.Fprintf(w, "GC Policy rule#%d:\n", ri)
+					fmt.Fprintf(w, "\tAll:\t%v\n", rule.All)
+					if len(rule.Filter) > 0 {
+						fmt.Fprintf(w, "\tFilters:\t%s\n", strings.Join(rule.Filter, " "))
+					}
+					if rule.KeepDuration > 0 {
+						fmt.Fprintf(w, "\tKeep Duration:\t%v\n", rule.KeepDuration.String())
+					}
+					if rule.KeepBytes > 0 {
+						fmt.Fprintf(w, "\tKeep Bytes:\t%s\n", units.BytesSize(float64(rule.KeepBytes)))
+					}
 				}
 				fmt.Fprintf(w, "Platforms:\t%s\n", strings.Join(platformutil.FormatInGroups(n.Platforms, drivers[i].Platforms), ", "))
 			}
@@ -117,3 +139,14 @@ func inspectCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 
 	return cmd
 }
+
+func sortedKeys(m map[string]string) []string {
+	s := make([]string, len(m))
+	i := 0
+	for k := range m {
+		s[i] = k
+		i++
+	}
+	sort.Strings(s)
+	return s
+}