switch back from golang.org/x/sys/execabs to os/exec (go1.19)

This is effectively a revert of 2ac9968401, which
switched from os/exec to the golang.org/x/sys/execabs package to mitigate
security issues (mainly on Windows) with lookups resolving to binaries in the
current directory.

from the go1.19 release notes https://go.dev/doc/go1.19#os-exec-path

> ## PATH lookups
>
> Command and LookPath no longer allow results from a PATH search to be found
> relative to the current directory. This removes a common source of security
> problems but may also break existing programs that depend on using, say,
> exec.Command("prog") to run a binary named prog (or, on Windows, prog.exe) in
> the current directory. See the os/exec package documentation for information
> about how best to update such programs.
>
> On Windows, Command and LookPath now respect the NoDefaultCurrentDirectoryInExePath
> environment variable, making it possible to disable the default implicit search
> of “.” in PATH lookups on Windows systems.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

integration/client/client_test.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
 	"testing"
 	"time"
 
@@ -30,7 +31,6 @@ import (
 	"github.com/opencontainers/image-spec/identity"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/otel"
-	exec "golang.org/x/sys/execabs"
 
 	. "github.com/containerd/containerd/v2/client"
 	"github.com/containerd/containerd/v2/defaults"

integration/client/container_fuzzer.go

@@ -26,13 +26,13 @@ import (
 	"io"
 	"net/http"
 	"os"
+	"os/exec"
 	"strings"
 	"time"
 
 	fuzz "github.com/AdaLogics/go-fuzz-headers"
 	containerd "github.com/containerd/containerd/v2/client"
 	"github.com/containerd/containerd/v2/oci"
-	exec "golang.org/x/sys/execabs"
 )
 
 var (

integration/client/container_linux_test.go

@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -44,7 +45,6 @@ import (
 
 	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/stretchr/testify/require"
-	exec "golang.org/x/sys/execabs"
 	"golang.org/x/sys/unix"
 )
 

integration/client/container_test.go

@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
 	"path"
 	"path/filepath"
 	"runtime"
@@ -49,7 +50,6 @@ import (
 	"github.com/containerd/typeurl/v2"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/stretchr/testify/require"
-	exec "golang.org/x/sys/execabs"
 )
 
 func empty() cio.Creator {

integration/client/daemon.go

@@ -21,13 +21,13 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"os/exec"
 	"runtime"
 	"sync"
 	"syscall"
 	"time"
 
 	. "github.com/containerd/containerd/v2/client"
-	exec "golang.org/x/sys/execabs"
 )
 
 type daemon struct {

integration/client/restart_monitor_test.go

@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strconv"
@@ -38,7 +39,6 @@ import (
 	srvconfig "github.com/containerd/containerd/v2/services/server/config"
 	"github.com/containerd/typeurl/v2"
 	"github.com/stretchr/testify/require"
-	exec "golang.org/x/sys/execabs"
 )
 
 func newDaemonWithConfig(t *testing.T, configTOML string) (*Client, *daemon, func()) {