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fix(deps): update module github.com/microsoft/hcsshim to v0.12.0-rc.1 

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
This commit is contained in:
renovate[bot] 2023-11-05 11:41:20 +00:00 committed by GitHub
parent 173c1a5443
commit 4489441fed
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GPG Key ID: 4AEE18F83AFDEB23
16 changed files with 138 additions and 153 deletions
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4
go.mod
View File

@ -5,7 +5,7 @@ module github.com/containers/storage
require (
github.com/BurntSushi/toml v1.3.2
github.com/Microsoft/go-winio v0.6.1
github.com/Microsoft/hcsshim v0.12.0-rc.0
github.com/Microsoft/hcsshim v0.12.0-rc.1
github.com/containerd/stargz-snapshotter/estargz v0.15.1
github.com/cyphar/filepath-securejoin v0.2.4
github.com/docker/go-units v0.5.0
@ -45,7 +45,7 @@ require (
github.com/pkg/errors v0.9.1 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
go.opencensus.io v0.24.0 // indirect
golang.org/x/mod v0.10.0 // indirect
golang.org/x/mod v0.11.0 // indirect
golang.org/x/sync v0.4.0 // indirect
golang.org/x/tools v0.8.0 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20230525234030-28d5490b6b19 // indirect

12
go.sum
View File

@ -4,8 +4,8 @@ github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8
github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
github.com/Microsoft/go-winio v0.6.1 h1:9/kr64B9VUZrLm5YYwbGtUJnMgqWVOdUAXu6Migciow=
github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5+sAH+4kjUM=
github.com/Microsoft/hcsshim v0.12.0-rc.0 h1:wX/F5huJxH9APBkhKSEAqaiZsuBvbbDnyBROZAqsSaY=
github.com/Microsoft/hcsshim v0.12.0-rc.0/go.mod h1:rvOnw3YlfoNnEp45wReUngvsXbwRW+AFQ10GVjG1kMU=
github.com/Microsoft/hcsshim v0.12.0-rc.1 h1:Hy+xzYujv7urO5wrgcG58SPMOXNLrj4WCJbySs2XX/A=
github.com/Microsoft/hcsshim v0.12.0-rc.1/go.mod h1:Y1a1S0QlYp1mBpyvGiuEdOfZqnao+0uX5AWHXQ5NhZU=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
@ -122,15 +122,15 @@ golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/mod v0.11.0 h1:bUO06HqtnRcc/7l71XBe4WcqTZ+3AH1J59zWDDwLKgU=
golang.org/x/mod v0.11.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@ -147,7 +147,7 @@ golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=

68
vendor/github.com/Microsoft/hcsshim/internal/hcs/process.go generated vendored
View File

@ -12,14 +12,16 @@ import (
"syscall"
"time"
"go.opencensus.io/trace"
"github.com/Microsoft/hcsshim/internal/cow"
hcsschema "github.com/Microsoft/hcsshim/internal/hcs/schema2"
"github.com/Microsoft/hcsshim/internal/log"
"github.com/Microsoft/hcsshim/internal/oc"
"github.com/Microsoft/hcsshim/internal/protocol/guestrequest"
"github.com/Microsoft/hcsshim/internal/vmcompute"
"go.opencensus.io/trace"
)
// ContainerError is an error encountered in HCS
type Process struct {
handleLock sync.RWMutex
handle vmcompute.HcsProcess
@ -50,35 +52,6 @@ func newProcess(process vmcompute.HcsProcess, processID int, computeSystem *Syst
}
}
type processModifyRequest struct {
Operation string
ConsoleSize *consoleSize `json:",omitempty"`
CloseHandle *closeHandle `json:",omitempty"`
}
type consoleSize struct {
Height uint16
Width uint16
}
type closeHandle struct {
Handle string
}
type processStatus struct {
ProcessID uint32
Exited bool
ExitCode uint32
LastWaitResult int32
}
const stdIn string = "StdIn"
const (
modifyConsoleSize string = "ConsoleSize"
modifyCloseHandle string = "CloseHandle"
)
// Pid returns the process ID of the process within the container.
func (process *Process) Pid() int {
return process.processID
@ -260,14 +233,14 @@ func (process *Process) waitBackground() {
process.handleLock.RLock()
defer process.handleLock.RUnlock()
// Make sure we didnt race with Close() here
// Make sure we didn't race with Close() here
if process.handle != 0 {
propertiesJSON, resultJSON, err = vmcompute.HcsGetProcessProperties(ctx, process.handle)
events := processHcsResult(ctx, resultJSON)
if err != nil {
err = makeProcessError(process, operation, err, events)
} else {
properties := &processStatus{}
properties := &hcsschema.ProcessStatus{}
err = json.Unmarshal([]byte(propertiesJSON), properties)
if err != nil {
err = makeProcessError(process, operation, err, nil)
@ -318,10 +291,9 @@ func (process *Process) ResizeConsole(ctx context.Context, width, height uint16)
if process.handle == 0 {
return makeProcessError(process, operation, ErrAlreadyClosed, nil)
}
modifyRequest := processModifyRequest{
Operation: modifyConsoleSize,
ConsoleSize: &consoleSize{
modifyRequest := hcsschema.ProcessModifyRequest{
Operation: guestrequest.ModifyProcessConsoleSize,
ConsoleSize: &hcsschema.ConsoleSize{
Height: height,
Width: width,
},
@ -421,18 +393,12 @@ func (process *Process) CloseStdin(ctx context.Context) (err error) {
return makeProcessError(process, operation, ErrAlreadyClosed, nil)
}
process.stdioLock.Lock()
defer process.stdioLock.Unlock()
if process.stdin == nil {
return nil
}
//HcsModifyProcess request to close stdin will fail if the process has already exited
if !process.stopped() {
modifyRequest := processModifyRequest{
Operation: modifyCloseHandle,
CloseHandle: &closeHandle{
Handle: stdIn,
modifyRequest := hcsschema.ProcessModifyRequest{
Operation: guestrequest.CloseProcessHandle,
CloseHandle: &hcsschema.CloseHandle{
Handle: guestrequest.STDInHandle,
},
}
@ -448,8 +414,12 @@ func (process *Process) CloseStdin(ctx context.Context) (err error) {
}
}
process.stdin.Close()
process.stdin = nil
process.stdioLock.Lock()
defer process.stdioLock.Unlock()
if process.stdin != nil {
process.stdin.Close()
process.stdin = nil
}
return nil
}

4
vendor/github.com/Microsoft/hcsshim/internal/hcs/schema2/close_handle.go generated vendored
View File

@ -9,6 +9,8 @@
package hcsschema
import "github.com/Microsoft/hcsshim/internal/protocol/guestrequest"
type CloseHandle struct {
Handle string `json:"Handle,omitempty"`
Handle guestrequest.STDIOHandle `json:"Handle,omitempty"` // NOTE: Swagger generated as string. Locally updated.
}

9
vendor/github.com/Microsoft/hcsshim/internal/hcs/schema2/console_size.go generated vendored
View File

@ -9,8 +9,11 @@
package hcsschema
type ConsoleSize struct {
Height int32 `json:"Height,omitempty"`
// NOTE: Swagger generated fields as int32. Locally updated to uint16 to match documentation.
// https://learn.microsoft.com/en-us/virtualization/api/hcs/schemareference#ConsoleSize
Width int32 `json:"Width,omitempty"`
type ConsoleSize struct {
Height uint16 `json:"Height,omitempty"`
Width uint16 `json:"Width,omitempty"`
}

6
vendor/github.com/Microsoft/hcsshim/internal/hcs/schema2/process_modify_request.go generated vendored
View File

@ -9,9 +9,11 @@
package hcsschema
// Passed to HcsRpc_ModifyProcess
import "github.com/Microsoft/hcsshim/internal/protocol/guestrequest"
// Passed to HcsRpc_ModifyProcess
type ProcessModifyRequest struct {
Operation string `json:"Operation,omitempty"`
Operation guestrequest.ProcessModifyOperation `json:"Operation,omitempty"` // NOTE: Swagger generated as string. Locally updated.
ConsoleSize *ConsoleSize `json:"ConsoleSize,omitempty"`

9
vendor/github.com/Microsoft/hcsshim/internal/hcs/schema2/process_status.go generated vendored
View File

@ -9,13 +9,16 @@
package hcsschema
// Status of a process running in a container
// NOTE: Swagger generated fields as int32. Locally updated to uint16 to match documentation.
// https://learn.microsoft.com/en-us/virtualization/api/hcs/schemareference#ConsoleSize
// Status of a process running in a container
type ProcessStatus struct {
ProcessId int32 `json:"ProcessId,omitempty"`
ProcessId uint32 `json:"ProcessId,omitempty"` // NOTE: Swagger generated as int32. Locally updated to match documentation.
Exited bool `json:"Exited,omitempty"`
ExitCode int32 `json:"ExitCode,omitempty"`
ExitCode uint32 `json:"ExitCode,omitempty"` // NOTE: Swagger generated as int32. Locally updated to match documentation.
LastWaitResult int32 `json:"LastWaitResult,omitempty"`
}

31
vendor/github.com/Microsoft/hcsshim/internal/hcs/system.go generated vendored
View File

@ -304,11 +304,22 @@ func (computeSystem *System) WaitError() error {
return computeSystem.waitError
}
// Wait synchronously waits for the compute system to shutdown or terminate. If
// the compute system has already exited returns the previous error (if any).
// Wait synchronously waits for the compute system to shutdown or terminate.
// If the compute system has already exited returns the previous error (if any).
func (computeSystem *System) Wait() error {
<-computeSystem.WaitChannel()
return computeSystem.WaitError()
return computeSystem.WaitCtx(context.Background())
}
// WaitCtx synchronously waits for the compute system to shutdown or terminate, or the context to be cancelled.
//
// See [System.Wait] for more information.
func (computeSystem *System) WaitCtx(ctx context.Context) error {
select {
case <-computeSystem.WaitChannel():
return computeSystem.WaitError()
case <-ctx.Done():
return ctx.Err()
}
}
// stopped returns true if the compute system stopped.
@ -735,9 +746,17 @@ func (computeSystem *System) OpenProcess(ctx context.Context, pid int) (*Process
}
// Close cleans up any state associated with the compute system but does not terminate or wait for it.
func (computeSystem *System) Close() (err error) {
func (computeSystem *System) Close() error {
return computeSystem.CloseCtx(context.Background())
}
// CloseCtx is similar to [System.Close], but accepts a context.
//
// The context is used for all operations, including waits, so timeouts/cancellations may prevent
// proper system cleanup.
func (computeSystem *System) CloseCtx(ctx context.Context) (err error) {
operation := "hcs::System::Close"
ctx, span := oc.StartSpan(context.Background(), operation)
ctx, span := oc.StartSpan(ctx, operation)
defer span.End()
defer func() { oc.SetSpanStatus(span, err) }()
span.AddAttributes(trace.StringAttribute("cid", computeSystem.id))

7
vendor/github.com/Microsoft/hcsshim/internal/log/format.go generated vendored
View File

@ -9,13 +9,16 @@ import (
"reflect"
"time"
"github.com/containerd/containerd/log"
"github.com/sirupsen/logrus"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
const TimeFormat = log.RFC3339NanoFixed
// TimeFormat is [time.RFC3339Nano] with nanoseconds padded using
// zeros to ensure the formatted time is always the same number of
// characters.
// Based on RFC3339NanoFixed from github.com/containerd/log
const TimeFormat = "2006-01-02T15:04:05.000000000Z07:00"
func FormatTime(t time.Time) string {
return t.Format(TimeFormat)

5
vendor/github.com/Microsoft/hcsshim/internal/log/hook.go generated vendored
View File

@ -6,7 +6,6 @@ import (
"time"
"github.com/Microsoft/hcsshim/internal/logfields"
"github.com/containerd/containerd/log"
"github.com/sirupsen/logrus"
"go.opencensus.io/trace"
)
@ -30,7 +29,7 @@ type Hook struct {
// An empty string disables formatting.
// When disabled, the fall back will the JSON encoding, if enabled.
//
// Default is [github.com/containerd/containerd/log.RFC3339NanoFixed].
// Default is [TimeFormat].
TimeFormat string
// Duration format converts a [time.Duration] fields to an appropriate encoding.
@ -49,7 +48,7 @@ var _ logrus.Hook = &Hook{}
func NewHook() *Hook {
return &Hook{
TimeFormat: log.RFC3339NanoFixed,
TimeFormat: TimeFormat,
DurationFormat: DurationFormatString,
AddSpanContext: true,
}

12
vendor/github.com/Microsoft/hcsshim/internal/log/nopformatter.go generated vendored Normal file
View File

@ -0,0 +1,12 @@
package log
import (
"github.com/sirupsen/logrus"
)
type NopFormatter struct{}
var _ logrus.Formatter = NopFormatter{}
// Format does nothing and returns a nil slice.
func (NopFormatter) Format(*logrus.Entry) ([]byte, error) { return nil, nil }

22
vendor/github.com/Microsoft/hcsshim/internal/protocol/guestrequest/types.go generated vendored
View File

@ -5,7 +5,7 @@ package guestrequest
type RequestType string
type ResourceType string
// RequestType const
// RequestType const.
const (
RequestTypeAdd RequestType = "Add"
RequestTypeRemove RequestType = "Remove"
@ -54,3 +54,23 @@ var (
"305891a9-b251-5dfe-91a2-c25d9212275b",
}
)
// constants for v2 schema ProcessModifyRequest
// Operation type for [hcsschema.ProcessModifyRequest].
type ProcessModifyOperation string
const (
ModifyProcessConsoleSize ProcessModifyOperation = "ConsoleSize"
CloseProcessHandle ProcessModifyOperation = "CloseHandle"
)
// Standard IO handle(s) to close for [hcsschema.CloseHandle] in [hcsschema.ProcessModifyRequest].
type STDIOHandle string
const (
STDInHandle STDIOHandle = "StdIn"
STDOutHandle STDIOHandle = "StdOut"
STDErrHandle STDIOHandle = "StdErr"
AllHandles STDIOHandle = "All"
)

24
vendor/github.com/Microsoft/hcsshim/internal/wclayer/layerutils.go generated vendored
View File

@ -7,6 +7,10 @@ package wclayer
import (
"context"
"fmt"
"os"
"path/filepath"
"strconv"
"syscall"
"github.com/Microsoft/go-winio/pkg/guid"
@ -101,3 +105,23 @@ func layerPathsToDescriptors(ctx context.Context, parentLayerPaths []string) ([]
return layers, nil
}
// GetLayerUvmBuild looks for a file named `uvmbuildversion` at `layerPath\uvmbuildversion` and returns the
// build number of the UVM from that file.
func GetLayerUvmBuild(layerPath string) (uint16, error) {
data, err := os.ReadFile(filepath.Join(layerPath, UvmBuildFileName))
if err != nil {
return 0, err
}
ver, err := strconv.ParseUint(string(data), 10, 16)
if err != nil {
return 0, err
}
return uint16(ver), nil
}
// WriteLayerUvmBuildFile writes a file at path `layerPath\uvmbuildversion` that contains the given `build`
// version for future reference.
func WriteLayerUvmBuildFile(layerPath string, build uint16) error {
return os.WriteFile(filepath.Join(layerPath, UvmBuildFileName), []byte(fmt.Sprintf("%d", build)), 0777)
}

1
vendor/github.com/Microsoft/hcsshim/layer.go generated vendored
View File

@ -32,6 +32,7 @@ func CreateScratchLayer(info DriverInfo, layerId, parentId string, parentLayerPa
func DeactivateLayer(info DriverInfo, id string) error {
return wclayer.DeactivateLayer(context.Background(), layerPath(&info, id))
}
func DestroyLayer(info DriverInfo, id string) error {
return wclayer.DestroyLayer(context.Background(), layerPath(&info, id))
}

72
vendor/github.com/containerd/containerd/log/context.go generated vendored
View File

@ -1,72 +0,0 @@
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package log
import (
"context"
"github.com/sirupsen/logrus"
)
var (
// G is an alias for GetLogger.
//
// We may want to define this locally to a package to get package tagged log
// messages.
G = GetLogger
// L is an alias for the standard logger.
L = logrus.NewEntry(logrus.StandardLogger())
)
type (
loggerKey struct{}
// Fields type to pass to `WithFields`, alias from `logrus`.
Fields = logrus.Fields
)
const (
// RFC3339NanoFixed is time.RFC3339Nano with nanoseconds padded using zeros to
// ensure the formatted time is always the same number of characters.
RFC3339NanoFixed = "2006-01-02T15:04:05.000000000Z07:00"
// TextFormat represents the text logging format
TextFormat = "text"
// JSONFormat represents the JSON logging format
JSONFormat = "json"
)
// WithLogger returns a new context with the provided logger. Use in
// combination with logger.WithField(s) for great effect.
func WithLogger(ctx context.Context, logger *logrus.Entry) context.Context {
e := logger.WithContext(ctx)
return context.WithValue(ctx, loggerKey{}, e)
}
// GetLogger retrieves the current logger from the context. If no logger is
// available, the default logger is returned.
func GetLogger(ctx context.Context) *logrus.Entry {
logger := ctx.Value(loggerKey{})
if logger == nil {
return L.WithContext(ctx)
}
return logger.(*logrus.Entry)
}

5
vendor/modules.txt vendored
View File

@ -11,7 +11,7 @@ github.com/Microsoft/go-winio/internal/socket
github.com/Microsoft/go-winio/internal/stringbuffer
github.com/Microsoft/go-winio/pkg/guid
github.com/Microsoft/go-winio/vhd
# github.com/Microsoft/hcsshim v0.12.0-rc.0
# github.com/Microsoft/hcsshim v0.12.0-rc.1
## explicit; go 1.18
github.com/Microsoft/hcsshim
github.com/Microsoft/hcsshim/computestorage
@ -44,7 +44,6 @@ github.com/containerd/cgroups/v3/cgroup1/stats
# github.com/containerd/containerd v1.7.0
## explicit; go 1.19
github.com/containerd/containerd/errdefs
github.com/containerd/containerd/log
# github.com/containerd/stargz-snapshotter/estargz v0.15.1
## explicit; go 1.19
github.com/containerd/stargz-snapshotter/estargz
@ -170,7 +169,7 @@ go.opencensus.io/internal
go.opencensus.io/trace
go.opencensus.io/trace/internal
go.opencensus.io/trace/tracestate
# golang.org/x/mod v0.10.0
# golang.org/x/mod v0.11.0
## explicit; go 1.17
golang.org/x/mod/semver
# golang.org/x/sync v0.4.0