vendor: Update github.com/kata-containers/agent to handle hvsock issue

Update github.com/kata-containers/agent to handle hvsock issue.

Shortlog:
    33f3208 client.go: HybridVSockDialer: Close dup fd after receive packet
    74a3b95 release: Kata Containers 1.10.0-rc0
    afd0871 ci: install docker before configure
    c502552 client.go: HybridVSockDialer: Check return size n of unix.Recvfrom
    f8e4ce8 client.go: HybridVSockDialer: Change Read EOT to recv peek
    5b64d42 agent: get current cpuset from /sys/devices/system/cpu/online
    183a24a release: Kata Containers 1.10.0-alpha1
    1ee8516 config: add option to control hotplug timeout of block devices
    40567f6 release: Kata Containers 1.10.0-alpha0
    19bee57 agent: connect debugging console in a specific vsock port
    8361150 docs: Add enable services and installation steps for TRACING.md
    a4f7373 agent: fix pause bin on musl
    f9f129a docs: Add missing steps at TRACING.md
    d3e66bf tracing: Wrapper for tracing functions
    7a7dba7 network: ensure parent directories exist
    455f728 tracing: Generate an alias for opentracing.Span
    5f302e5 agent: Revert "client: remove the parameter of 'enableYamux'"
    717ee24 client: remove the parameter of 'enableYamux'
    d387c77 vendor: Update github.com/syndtr/gocapability/capability
    b3d737b vendor: update libcontainer to 1.0.0-rc9
    6eac713 release: Kata Containers 1.9.0-rc0

Fixes: #2284

Signed-off-by: Hui Zhu <teawater@antfin.com>

Gopkg.lock

@@ -405,7 +405,7 @@
   revision = "8cba5a8e5f2816f26f9dc34b8ea968279a5a76eb"
 
 [[projects]]
-  digest = "1:903bfb87f41dc18a533d327b5b03fd2f562f34deafcbd0db93d4be3fa8d6099c"
+  digest = "1:6da9487ef0cc0cca3eeb1a24e3bb018ce2e07b7c2fc4d50975b54efdcc942118"
   name = "github.com/kata-containers/agent"
   packages = [
     "pkg/types",
@@ -413,7 +413,7 @@
     "protocols/grpc",
   ]
   pruneopts = "NUT"
-  revision = "32c87e75c2e4c014961f104c3c59b87f2aee3384"
+  revision = "6182fa34c64ba6eb1b6028d8b6647a86844129c4"
 
 [[projects]]
   branch = "master"

Gopkg.toml

@@ -52,7 +52,7 @@
 
 [[constraint]]
   name = "github.com/kata-containers/agent"
-  revision = "32c87e75c2e4c014961f104c3c59b87f2aee3384"
+  revision = "6182fa34c64ba6eb1b6028d8b6647a86844129c4"
 
 [[constraint]]
   name = "github.com/containerd/cri-containerd"

vendor/github.com/kata-containers/agent/protocols/client/client.go

@@ -9,16 +9,19 @@ package client
 import (
 	"context"
 	"fmt"
+	"io"
 	"net"
 	"net/url"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"
 
 	"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
 	"github.com/hashicorp/yamux"
 	"github.com/mdlayher/vsock"
 	opentracing "github.com/opentracing/opentracing-go"
+	"golang.org/x/sys/unix"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	grpcStatus "google.golang.org/grpc/status"
@@ -407,12 +410,24 @@ func HybridVSockDialer(sock string, timeout time.Duration) (net.Conn, error) {
 			return nil, err
 		}
 
-		// Read EOT (End of transmission) byte
-		eot := make([]byte, 32)
-		if _, err = conn.Read(eot); err != nil {
-			// Just close the connection, gRPC will dial again
-			// without errors
-			conn.Close()
+		// Receive the packet from the connection without removing it from
+		// the receive queue (MSG_PEEK), ensuring the connection is usable.
+		if uc, ok := conn.(*net.UnixConn); ok {
+			file, err := uc.File()
+			if err != nil {
+				conn.Close()
+				return nil, err
+			}
+			eot := make([]byte, 1)
+			n, _, err := unix.Recvfrom(int(file.Fd()), eot, syscall.MSG_PEEK)
+			file.Close()
+			if err != nil || n == 0 {
+				conn.Close()
+				if err == nil {
+					err = io.EOF
+				}
+				return nil, err
+			}
 		}
 
 		return conn, nil