tests: switch from lazy_static to once_cell

Once_cell does not require using macro and is slated to become part of
Rust std at some point.

Signed-off-by: Wei Liu <liuwe@microsoft.com>

Cargo.lock

@@ -165,10 +165,10 @@ dependencies = [
  "epoll",
  "event_monitor",
  "hypervisor",
- "lazy_static",
  "libc",
  "log",
  "net_util",
+ "once_cell",
  "option_parser",
  "seccompiler",
  "serde_json",
@@ -1038,8 +1038,8 @@ version = "0.1.0"
 dependencies = [
  "dirs",
  "epoll",
- "lazy_static",
  "libc",
+ "once_cell",
  "ssh2",
  "vmm-sys-util",
  "wait-timeout",

Cargo.toml

@@ -44,8 +44,8 @@ versionize_derive = { git = "https://github.com/cloud-hypervisor/versionize_deri
 
 [dev-dependencies]
 dirs = "4.0.0"
-lazy_static= "1.4.0"
 net_util = { path = "net_util" }
+once_cell = "1.12.0"
 serde_json = "1.0.81"
 test_infra = { path = "test_infra" }
 wait-timeout = "0.2.0"

test_infra/Cargo.toml

@@ -7,8 +7,8 @@ edition = "2021"
 [dependencies]
 dirs = "4.0.0"
 epoll = "4.3.1"
-lazy_static = "1.4.0"
 libc = "0.2.126"
+once_cell = "1.12.0"
 ssh2 = { version = "0.9.1", features = ["vendored-openssl"]}
 vmm-sys-util = "0.9.0"
 wait-timeout = "0.2.0"

test_infra/src/lib.rs

@@ -3,9 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-#[macro_use]
+use once_cell::sync::Lazy;
-extern crate lazy_static;
-
 use ssh2::Session;
 use std::env;
 use std::ffi::OsStr;
@@ -722,9 +720,7 @@ pub fn exec_host_command_output(command: &str) -> Output {
 
 pub const PIPE_SIZE: i32 = 32 << 20;
 
-lazy_static! {
+static NEXT_VM_ID: Lazy<Mutex<u8>> = Lazy::new(|| Mutex::new(1));
-    static ref NEXT_VM_ID: Mutex<u8> = Mutex::new(1);
-}
 
 pub struct Guest {
     pub tmp_dir: TempDir,

tests/integration.rs

@@ -8,10 +8,6 @@
 // related warnings for our quality workflow to pass.
 #![allow(dead_code)]
 
-#[cfg(target_arch = "x86_64")]
-#[macro_use]
-extern crate lazy_static;
-
 extern crate test_infra;
 
 use net_util::MacAddr;
@@ -6565,10 +6561,9 @@ mod sequential {
 #[cfg(target_arch = "x86_64")]
 mod windows {
     use crate::*;
+    use once_cell::sync::Lazy;
 
-    lazy_static! {
+    static NEXT_DISK_ID: Lazy<Mutex<u8>> = Lazy::new(|| Mutex::new(1));
-        static ref NEXT_DISK_ID: Mutex<u8> = Mutex::new(1);
-    }
 
     struct WindowsGuest {
         guest: Guest,