[windows] skip window creation on auth exec (#1095)

* don't create a window for auth exec

Signed-off-by: goenning <me@goenning.net>

* rust fmt

Signed-off-by: goenning <me@goenning.net>

* move it close to other imports

Signed-off-by: goenning <me@goenning.net>

* Update kube-client/src/client/auth/mod.rs

Co-authored-by: kazk <kazk.dev@gmail.com>
Signed-off-by: Guilherme Oenning <me@goenning.net>

Signed-off-by: goenning <me@goenning.net>
Signed-off-by: Guilherme Oenning <me@goenning.net>
Co-authored-by: kazk <kazk.dev@gmail.com>
Co-authored-by: Eirik A <sszynrae@gmail.com>

kube-client/src/client/auth/mod.rs

@@ -4,6 +4,7 @@ use std::{
     sync::Arc,
 };
 
+
 use chrono::{DateTime, Duration, Utc};
 use futures::future::BoxFuture;
 use http::{
@@ -21,6 +22,7 @@ use crate::config::{AuthInfo, AuthProviderConfig, ExecConfig};
 
 #[cfg(feature = "oauth")] mod oauth;
 #[cfg(feature = "oauth")] pub use oauth::Error as OAuthError;
+#[cfg(target_os = "windows")] use std::os::windows::process::CommandExt;
 
 #[derive(Error, Debug)]
 /// Client auth errors
@@ -504,6 +506,12 @@ fn auth_exec(auth: &ExecConfig) -> Result<ExecCredential, Error> {
         }
     }
 
+    #[cfg(target_os = "windows")]
+    {
+        const CREATE_NO_WINDOW: u32 = 0x08000000;
+        cmd.creation_flags(CREATE_NO_WINDOW);
+    }
+
     let out = cmd.output().map_err(Error::AuthExecStart)?;
     if !out.status.success() {
         return Err(Error::AuthExecRun {