defaults: add DefaultConfigDir

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

cmd/containerd/command/main.go

@@ -27,6 +27,7 @@ import (
 	"runtime"
 	"time"
 
+	"github.com/containerd/containerd/defaults"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/mount"
@@ -80,7 +81,7 @@ can be used and modified as necessary as a custom configuration.`
 		cli.StringFlag{
 			Name:  "config,c",
 			Usage: "path to the configuration file",
-			Value: defaultConfigPath,
+			Value: filepath.Join(defaults.DefaultConfigDir, "config.toml"),
 		},
 		cli.StringFlag{
 			Name:  "log-level,l",

cmd/containerd/command/main_unix.go

@@ -27,8 +27,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-const defaultConfigPath = "/etc/containerd/config.toml"
-
 var handledSignals = []os.Signal{
 	unix.SIGTERM,
 	unix.SIGINT,

cmd/containerd/command/main_windows.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"path/filepath"
 	"unsafe"
 
 	"github.com/Microsoft/go-winio/pkg/etw"
@@ -33,8 +32,7 @@ import (
 )
 
 var (
-	defaultConfigPath = filepath.Join(os.Getenv("programfiles"), "containerd", "config.toml")
-	handledSignals    = []os.Signal{
+	handledSignals = []os.Signal{
 		windows.SIGTERM,
 		windows.SIGINT,
 	}