validate: change platform default value

Signed-off-by: zhouhao <zhouhao@cn.fujitsu.com>

Author: zhouhao

cmd/oci-runtime-tool/validate.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"runtime"
 
 	rfc2119 "github.com/opencontainers/runtime-tools/error"
 	"github.com/opencontainers/runtime-tools/specerror"
@@ -12,7 +13,7 @@ import (
 
 var bundleValidateFlags = []cli.Flag{
 	cli.StringFlag{Name: "path", Value: ".", Usage: "path to a bundle"},
-	cli.StringFlag{Name: "platform", Value: "linux", Usage: "platform of the target bundle (linux, windows, solaris)"},
+	cli.StringFlag{Name: "platform", Value: runtime.GOOS, Usage: "platform of the target bundle (linux, windows, solaris)"},
 }
 
 var bundleValidateCommand = cli.Command{

man/oci-runtime-tool-validate.1.md

@@ -19,7 +19,7 @@ Validate an OCI bundle
   Path to bundle. The default is current working directory.
 
 **--platform**=PLATFORM
-  Platform of the target bundle. (linux, windows, solaris) (default: "linux")
+  Platform of the target bundle. (linux, windows, solaris) The default is host platform.
   It will be overwritten by the host platform if the global option '--host-specific' was set.
 
 # SEE ALSO