Initial windows runtime work

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

cmd/ctr/exec_unix.go

@@ -0,0 +1,69 @@
+// +build !windows
+
+package main
+
+import (
+	"encoding/json"
+	"path/filepath"
+
+	"github.com/containerd/containerd/api/services/execution"
+	protobuf "github.com/gogo/protobuf/types"
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/urfave/cli"
+)
+
+func createProcessSpec(args []string, cwd string, tty bool) specs.Process {
+	env := []string{
+		"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+	}
+	if tty {
+		env = append(env, "TERM=xterm")
+	}
+	if cwd == "" {
+		cwd = "/"
+	}
+	return specs.Process{
+		Args:            args,
+		Env:             env,
+		Terminal:        tty,
+		Cwd:             cwd,
+		NoNewPrivileges: true,
+		User: specs.User{
+			UID: 0,
+			GID: 0,
+		},
+		Capabilities: &specs.LinuxCapabilities{
+			Bounding:    capabilities,
+			Permitted:   capabilities,
+			Inheritable: capabilities,
+			Effective:   capabilities,
+			Ambient:     capabilities,
+		},
+		Rlimits: []specs.LinuxRlimit{
+			{
+				Type: "RLIMIT_NOFILE",
+				Hard: uint64(1024),
+				Soft: uint64(1024),
+			},
+		},
+	}
+}
+
+func newExecRequest(context *cli.Context, tmpDir, id string) (*execution.ExecRequest, error) {
+	process := createProcessSpec(context.Args(), context.String("cwd"), context.Bool("tty"))
+	data, err := json.Marshal(process)
+	if err != nil {
+		return nil, err
+	}
+	return &execution.ExecRequest{
+		ID: id,
+		Spec: &protobuf.Any{
+			TypeUrl: specs.Version,
+			Value:   data,
+		},
+		Terminal: context.Bool("tty"),
+		Stdin:    filepath.Join(tmpDir, "stdin"),
+		Stdout:   filepath.Join(tmpDir, "stdout"),
+		Stderr:   filepath.Join(tmpDir, "stderr"),
+	}, nil
+}