Merge pull request #1958 from thaJeztah/0.11_backport_buildkit_0.12

.github/workflows/build.yml

@@ -102,7 +102,7 @@ jobs:
           ./hack/test
         env:
           TEST_DOCKERD: "${{ (matrix.worker == 'docker' || matrix.worker == 'docker-container') && '1' || '0' }}"
-          TESTFLAGS: "${{ (matrix.worker == 'docker' || matrix.worker == 'docker-container') && env.TESTFLAGS_DOCKER || env.TESTFLAGS }} --run=//worker=${{ matrix.worker }}$"
+          TESTFLAGS: "${{ (matrix.worker == 'docker') && env.TESTFLAGS_DOCKER || env.TESTFLAGS }} --run=//worker=${{ matrix.worker }}$"
           TESTPKGS: "${{ matrix.pkg }}"
           SKIP_INTEGRATION_TESTS: "${{ matrix.skip-integration-tests }}"
       -

go.mod

@@ -22,7 +22,7 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/go-cty-funcs v0.0.0-20200930094925-2721b1e36840
 	github.com/hashicorp/hcl/v2 v2.8.2
-	github.com/moby/buildkit v0.11.0-rc3.0.20230609092854-67a08623b95a
+	github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353 // v0.12.1-dev
 	github.com/moby/sys/mountinfo v0.6.2
 	github.com/moby/sys/signal v0.7.0
 	github.com/morikuni/aec v1.0.0
@@ -75,6 +75,7 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.0 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/cloudflare/cfssl v0.0.0-20181213083726-b94e044bb51e // indirect
+	github.com/containerd/ttrpc v1.2.2 // indirect
 	github.com/cyphar/filepath-securejoin v0.2.3 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/distribution/distribution/v3 v3.0.0-20230214150026-36d8c594d7aa // indirect
@@ -137,10 +138,10 @@ require (
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
 	github.com/spf13/viper v1.14.0 // indirect
 	github.com/theupdateframework/notary v0.6.1 // indirect
-	github.com/tonistiigi/fsutil v0.0.0-20230407161946-9e7a6df48576 // indirect
+	github.com/tonistiigi/fsutil v0.0.0-20230629203738-36ef4d8c0dbb // indirect
 	github.com/tonistiigi/units v0.0.0-20180711220420-6950e57a87ea // indirect
 	github.com/tonistiigi/vt100 v0.0.0-20230623042737-f9a4f7ef6531 // indirect
-	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
+	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.40.0 // indirect

go.sum

@@ -136,6 +136,7 @@ github.com/containerd/nydus-snapshotter v0.8.2 h1:7SOrMU2YmLzfbsr5J7liMZJlNi5WT6
 github.com/containerd/stargz-snapshotter v0.14.3 h1:OTUVZoPSPs8mGgmQUE1dqw3WX/3nrsmsurW7UPLWl1U=
 github.com/containerd/stargz-snapshotter/estargz v0.14.3 h1:OqlDCK3ZVUO6C3B/5FSkDwbkEETK84kQgEeFwDC+62k=
 github.com/containerd/ttrpc v1.2.2 h1:9vqZr0pxwOF5koz6N0N3kJ0zDHokrcPxIR/ZR2YFtOs=
+github.com/containerd/ttrpc v1.2.2/go.mod h1:sIT6l32Ph/H9cvnJsfXM5drIVzTr5A2flTf1G5tYZak=
 github.com/containerd/typeurl/v2 v2.1.1 h1:3Q4Pt7i8nYwy2KmQWIw2+1hTvwTE/6w9FqcttATPO/4=
 github.com/containerd/typeurl/v2 v2.1.1/go.mod h1:IDp2JFvbwZ31H8dQbEIY7sDl2L3o3HZj1hsSQlywkQ0=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
@@ -268,6 +269,7 @@ github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
@@ -369,8 +371,8 @@ github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzC
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
-github.com/moby/buildkit v0.11.0-rc3.0.20230609092854-67a08623b95a h1:1k3bAXwxC2N1FncWijq/43sLj2OVIZ11FT0APIXWhMg=
-github.com/moby/buildkit v0.11.0-rc3.0.20230609092854-67a08623b95a/go.mod h1:4sM7BBBqXOQ+vV6LrVAOAMhZI9cVNYV5RhZCl906a64=
+github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353 h1:/ZIwqvOF3QKObJbjX96xVvAKtnWdw/AuEqysbbujaZA=
+github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353/go.mod h1:+n9GmkxwBCjVz4u7wmiyh+oqvjIjQM+1zk3iJrWfdos=
 github.com/moby/locker v1.0.1 h1:fOXqR41zeveg4fFODix+1Ch4mj/gT0NE1XJbp/epuBg=
 github.com/moby/locker v1.0.1/go.mod h1:S7SDdo5zpBK84bzzVlKr2V0hz+7x9hWbYC/kq7oQppc=
 github.com/moby/patternmatcher v0.5.0 h1:YCZgJOeULcxLw1Q+sVR636pmS7sPEn1Qo2iAN6M7DBo=
@@ -435,6 +437,7 @@ github.com/prometheus/common v0.42.0/go.mod h1:xBwqVerjNdUDjgODMpudtOMwlOwf2SaTr
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.3/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
+github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/prometheus/procfs v0.9.0 h1:wzCHvIvM5SxWqYvwgVL7yJY8Lz3PKn49KQtpgMYJfhI=
 github.com/prometheus/procfs v0.9.0/go.mod h1:+pB4zwohETzFnmlpe6yd2lSc+0/46IYZRB/chUwxUZY=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
@@ -452,6 +455,7 @@ github.com/shibumi/go-pathspec v1.3.0 h1:QUyMZhFo0Md5B8zV8x2tesohbb5kfbpTi9rBnKh
 github.com/shibumi/go-pathspec v1.3.0/go.mod h1:Xutfslp817l2I1cZvgcfeMQJG5QnU2lh5tVaaMCl3jE=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
 github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
@@ -480,8 +484,8 @@ github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXl
 github.com/subosito/gotenv v1.4.1 h1:jyEFiXpy21Wm81FBN71l9VoMMV8H8jG+qIK3GCpY6Qs=
 github.com/theupdateframework/notary v0.6.1 h1:7wshjstgS9x9F5LuB1L5mBI2xNMObWqjz+cjWoom6l0=
 github.com/theupdateframework/notary v0.6.1/go.mod h1:MOfgIfmox8s7/7fduvB2xyPPMJCrjRLRizA8OFwpnKY=
-github.com/tonistiigi/fsutil v0.0.0-20230407161946-9e7a6df48576 h1:fZXPQDVh5fm2x7pA0CH1TtH80tiZ0L7i834kZqZN8Pw=
-github.com/tonistiigi/fsutil v0.0.0-20230407161946-9e7a6df48576/go.mod h1:q1CxMSzcAbjUkVGHoZeQUcCaALnaE4XdWk+zJcgMYFw=
+github.com/tonistiigi/fsutil v0.0.0-20230629203738-36ef4d8c0dbb h1:uUe8rNyVXM8moActoBol6Xf6xX2GMr7SosR2EywMvGg=
+github.com/tonistiigi/fsutil v0.0.0-20230629203738-36ef4d8c0dbb/go.mod h1:SxX/oNQ/ag6Vaoli547ipFK9J7BZn5JqJG0JE8lf8bA=
 github.com/tonistiigi/units v0.0.0-20180711220420-6950e57a87ea h1:SXhTLE6pb6eld/v/cCndK0AMpt1wiVFb/YYmqB3/QG0=
 github.com/tonistiigi/units v0.0.0-20180711220420-6950e57a87ea/go.mod h1:WPnis/6cRcDZSUvVmezrxJPkiO87ThFYsoUiMwWNDJk=
 github.com/tonistiigi/vt100 v0.0.0-20230623042737-f9a4f7ef6531 h1:Y/M5lygoNPKwVNLMPXgVfsRT40CSFKXCxuU8LoHySjs=
@@ -490,8 +494,9 @@ github.com/vbatts/tar-split v0.11.2 h1:Via6XqJr0hceW4wff3QRzD5gAk/tatMw/4ZA7cTlI
 github.com/vmihailenco/msgpack v3.3.3+incompatible/go.mod h1:fy3FlTQTDXWkZ7Bh6AcGMlsjHatGryHQYUTf1ShIgkk=
 github.com/vmihailenco/msgpack/v4 v4.3.12/go.mod h1:gborTTJjAo/GWTqqRjrLCn9pgNN+NXzzngzBKDPIqw4=
 github.com/vmihailenco/tagparser v0.1.1/go.mod h1:OeAg3pn3UbLjkWt+rN9oFYB6u/cQgqMEUPoW2WPyhdI=
-github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f h1:J9EGpcZtP0E/raorCMxlFGSTBrsSlaDGf3jU/qvAE2c=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
+github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb h1:zGWFAtiMcyryUHoUjUJX0/lt1H2+i2Ka2n+D3DImSNo=
+github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHovont7NscjpAxXsDA8S8BMYve8Y5+7cuRE7R0=
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
 github.com/xeipuuv/gojsonschema v1.2.0 h1:LhYJRs+L4fBtjZUfuSZIKGeVu0QRy8e5Xi7D17UxZ74=
@@ -631,6 +636,7 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
 golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -648,6 +654,7 @@ golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -672,6 +679,7 @@ golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
 golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=

tests/integration.go

@@ -47,6 +47,7 @@ func buildxCmd(sb integration.Sandbox, opts ...cmdOpt) *exec.Cmd {
 
 	if builder := sb.Address(); builder != "" {
 		cmd.Args = append(cmd.Args, "--builder="+builder)
+		cmd.Env = append(cmd.Env, "BUILDX_CONFIG=/tmp/buildx-"+builder)
 	}
 	if context := sb.DockerAddress(); context != "" {
 		cmd.Env = append(cmd.Env, "DOCKER_CONTEXT="+context)

tests/workers/docker-container.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"os"
 	"os/exec"
+	"sync"
 
 	"github.com/moby/buildkit/identity"
 	"github.com/moby/buildkit/util/testutil/integration"
@@ -18,6 +19,11 @@ func InitDockerContainerWorker() {
 
 type containerWorker struct {
 	id string
+
+	docker      integration.Backend
+	dockerClose func() error
+	dockerErr   error
+	dockerOnce  sync.Once
 }
 
 func (w *containerWorker) Name() string {
@@ -29,9 +35,11 @@ func (w *containerWorker) Rootless() bool {
 }
 
 func (w *containerWorker) New(ctx context.Context, cfg *integration.BackendConfig) (integration.Backend, func() error, error) {
-	bk, bkclose, err := dockerWorker{id: w.id}.New(ctx, cfg)
-	if err != nil {
-		return bk, bkclose, err
+	w.dockerOnce.Do(func() {
+		w.docker, w.dockerClose, w.dockerErr = dockerWorker{id: w.id}.New(ctx, cfg)
+	})
+	if w.dockerErr != nil {
+		return w.docker, w.dockerClose, w.dockerErr
 	}
 
 	name := "integration-container-" + identity.NewID()
@@ -42,25 +50,36 @@ func (w *containerWorker) New(ctx context.Context, cfg *integration.BackendConfi
 		"--driver=docker-container",
 		"--driver-opt=network=host",
 	)
-	cmd.Env = append(os.Environ(), "DOCKER_CONTEXT="+bk.DockerAddress())
+	cmd.Env = append(
+		os.Environ(),
+		"BUILDX_CONFIG=/tmp/buildx-"+name,
+		"DOCKER_CONTEXT="+w.docker.DockerAddress(),
+	)
 	if err := cmd.Run(); err != nil {
 		return nil, nil, errors.Wrapf(err, "failed to create buildx instance %s", name)
 	}
 
 	cl := func() error {
-		var err error
-		if err1 := bkclose(); err == nil {
-			err = err1
-		}
 		cmd := exec.Command("buildx", "rm", "-f", name)
-		if err1 := cmd.Run(); err == nil {
-			err = err1
-		}
-		return err
+		return cmd.Run()
 	}
 
 	return &backend{
-		context: bk.DockerAddress(),
+		context: w.docker.DockerAddress(),
 		builder: name,
 	}, cl, nil
 }
+
+func (w *containerWorker) Close() error {
+	if close := w.dockerClose; close != nil {
+		return close()
+	}
+
+	// reset the worker to be ready to go again
+	w.docker = nil
+	w.dockerClose = nil
+	w.dockerErr = nil
+	w.dockerOnce = sync.Once{}
+
+	return nil
+}

tests/workers/docker.go

@@ -2,6 +2,7 @@ package workers
 
 import (
 	"context"
+	"os"
 	"os/exec"
 
 	"github.com/moby/buildkit/identity"
@@ -41,8 +42,9 @@ func (c dockerWorker) New(ctx context.Context, cfg *integration.BackendConfig) (
 		name,
 		"--docker", "host="+bk.DockerAddress(),
 	)
+	cmd.Env = append(os.Environ(), "BUILDX_CONFIG=/tmp/buildx-"+name)
 	if err := cmd.Run(); err != nil {
-		return nil, cl, errors.Wrapf(err, "failed to create buildx instance %s", name)
+		return bk, cl, errors.Wrapf(err, "failed to create buildx instance %s", name)
 	}
 
 	cl = func() error {
@@ -62,3 +64,7 @@ func (c dockerWorker) New(ctx context.Context, cfg *integration.BackendConfig) (
 		context: name,
 	}, cl, nil
 }
+
+func (c dockerWorker) Close() error {
+	return nil
+}

tests/workers/remote.go

@@ -2,6 +2,7 @@ package workers
 
 import (
 	"context"
+	"os"
 	"os/exec"
 
 	"github.com/moby/buildkit/identity"
@@ -41,6 +42,7 @@ func (w remoteWorker) New(ctx context.Context, cfg *integration.BackendConfig) (
 		"--driver=remote",
 		bk.Address(),
 	)
+	cmd.Env = append(os.Environ(), "BUILDX_CONFIG=/tmp/buildx-"+name)
 	if err := cmd.Run(); err != nil {
 		return nil, nil, errors.Wrapf(err, "failed to create buildx instance %s", name)
 	}
@@ -61,3 +63,7 @@ func (w remoteWorker) New(ctx context.Context, cfg *integration.BackendConfig) (
 		builder: name,
 	}, cl, nil
 }
+
+func (w remoteWorker) Close() error {
+	return nil
+}