*: update drainExecSyncIO docs and validate the timeout

We should validate the drainExecSyncIO timeout at the beginning and
raise the error for any invalid input.

Signed-off-by: Wei Fu <fuweid89@gmail.com>

pkg/cri/config/config.go

@@ -357,6 +357,8 @@ type PluginConfig struct {
 	//
 	// The string is in the golang duration format, see:
 	//   https://golang.org/pkg/time/#ParseDuration
+	//
+	// For example, the value can be '5h', '2h30m', '10s'.
 	DrainExecSyncIOTimeout string `toml:"drain_exec_sync_io_timeout" json:"drainExecSyncIOTimeout"`
 }
 

pkg/cri/config/config_unix.go

@@ -110,6 +110,6 @@ func DefaultConfig() PluginConfig {
 		EnableCDI:                false,
 		CDISpecDirs:              []string{"/etc/cdi", "/var/run/cdi"},
 		ImagePullProgressTimeout: time.Minute.String(),
-		DrainExecSyncIOTimeout:   "0",
+		DrainExecSyncIOTimeout:   "0s",
 	}
 }

pkg/cri/config/config_windows.go

@@ -86,6 +86,6 @@ func DefaultConfig() PluginConfig {
 			KeyModel: KeyModelNode,
 		},
 		ImagePullProgressTimeout: time.Minute.String(),
-		DrainExecSyncIOTimeout:   "0",
+		DrainExecSyncIOTimeout:   "0s",
 	}
 }