[19.03 backport] build: buildkit now also uses systemd's resolv.conf

daemon/daemon_linux.go

@@ -9,18 +9,13 @@ import (
 	"strings"
 
 	"github.com/docker/docker/daemon/config"
-	"github.com/docker/docker/internal/procfs"
 	"github.com/docker/docker/pkg/fileutils"
 	"github.com/docker/docker/pkg/mount"
+	"github.com/docker/libnetwork/resolvconf"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
 
-const (
-	defaultResolvConf   = "/etc/resolv.conf"
-	alternateResolvConf = "/run/systemd/resolve/resolv.conf"
-)
-
 // On Linux, plugins use a static path for storing execution state,
 // instead of deriving path from daemon's exec-root. This is because
 // plugin socket files are created here and they cannot exceed max
@@ -148,20 +143,5 @@ func setupResolvConf(config *config.Config) {
 	if config.ResolvConf != "" {
 		return
 	}
-
-	config.ResolvConf = defaultResolvConf
-	pids, err := procfs.PidOf("systemd-resolved")
-	if err != nil {
-		logrus.Errorf("unable to check systemd-resolved status: %s", err)
-		return
-	}
-	if len(pids) > 0 && pids[0] > 0 {
-		_, err := os.Stat(alternateResolvConf)
-		if err == nil {
-			logrus.Infof("systemd-resolved is running, so using resolvconf: %s", alternateResolvConf)
-			config.ResolvConf = alternateResolvConf
-			return
-		}
-		logrus.Infof("systemd-resolved is running, but %s is not present, fallback to %s", alternateResolvConf, defaultResolvConf)
-	}
+	config.ResolvConf = resolvconf.Path()
 }

vendor.conf

@@ -27,7 +27,7 @@ github.com/imdario/mergo                            7c29201646fa3de8506f70121347
 golang.org/x/sync                                   e225da77a7e68af35c70ccbf71af2b83e6acac3c
 
 # buildkit
-github.com/moby/buildkit                            37d53758a68d9f5cede1806dbb2da7c3caa8d5bc
+github.com/moby/buildkit                            1f89ec125f84c097bdf3a063be622c4238dba5f8
 github.com/tonistiigi/fsutil                        3bbb99cdbd76619ab717299830c60f6f2a533a6b
 github.com/grpc-ecosystem/grpc-opentracing          8e809c8a86450a29b90dcc9efbf062d0fe6d9746
 github.com/opentracing/opentracing-go               1361b9cd60be79c4c3a7fa9841b3c132e40066a7
@@ -39,7 +39,7 @@ github.com/gofrs/flock                              7f43ea2e6a643ad441fc12d0ecc0
 # libnetwork
 
 # When updating, also update LIBNETWORK_COMMIT in hack/dockerfile/install/proxy.installer accordingly
-github.com/docker/libnetwork                        5ac07abef4eee176423fdc1b870d435258e2d381
+github.com/docker/libnetwork                        fc5a7d91d54cc98f64fc28f9e288b46a0bee756c
 github.com/docker/go-events                         9461782956ad83b30282bf90e31fa6a70c255ba9
 github.com/armon/go-radix                           e39d623f12e8e41c7b5529e9a9dd67a1e2261f80
 github.com/armon/go-metrics                         eb0af217e5e9747e41dd5303755356b62d28e3ec