build: Fix beta clippy issue (useless_vec)

warning: useless use of `vec!`
   --> test_infra/src/lib.rs:111:30
    |
111 |             let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); 1];
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can use an array directly: `[epoll::Event::new(epoll::Events::empty(), 0); 1]`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_vec
    = note: `#[warn(clippy::useless_vec)]` on by default

Signed-off-by: Yu Li <liyu.yukiteru@bytedance.com>

src/main.rs

@@ -799,7 +799,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_cpus() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",
@@ -917,7 +917,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_kernel() {
-        vec![(
+        [(
             vec!["cloud-hypervisor", "--kernel", "/path/to/kernel"],
             r#"{
                 "payload": {"kernel": "/path/to/kernel"}
@@ -932,7 +932,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_cmdline() {
-        vec![(
+        [(
             vec![
                 "cloud-hypervisor",
                 "--kernel",
@@ -953,7 +953,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_disks() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",
@@ -1227,7 +1227,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_rng() {
-        vec![(
+        [(
             vec![
                 "cloud-hypervisor",
                 "--kernel",
@@ -1249,8 +1249,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_fs() {
-        vec![
+        [(
-            (
                 vec![
                     "cloud-hypervisor", "--kernel", "/path/to/kernel",
                     "--memory", "shared=true",
@@ -1320,8 +1319,7 @@ mod unit_tests {
                     ]
                 }"#,
                 true,
-            ),
+            )]
-        ]
         .iter()
         .for_each(|(cli, openapi, equal)| {
             compare_vm_config_cli_vs_json(cli, openapi, *equal);
@@ -1330,7 +1328,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_pmem() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",
@@ -1394,7 +1392,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_serial_console() {
-        vec![
+        [
             (
                 vec!["cloud-hypervisor", "--kernel", "/path/to/kernel"],
                 r#"{
@@ -1445,7 +1443,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_serial_pty_console_pty() {
-        vec![
+        [
             (
                 vec!["cloud-hypervisor", "--kernel", "/path/to/kernel"],
                 r#"{
@@ -1593,7 +1591,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_vdpa() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",
@@ -1640,7 +1638,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_vsock() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",
@@ -1723,7 +1721,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_tpm_socket() {
-        vec![(
+        [(
             vec![
                 "cloud-hypervisor",
                 "--kernel",

test_infra/src/lib.rs

@@ -108,7 +108,7 @@ impl GuestNetworkConfig {
                 epoll::Event::new(epoll::Events::EPOLLIN, 0),
             )
             .expect("Cannot add 'tcp_listener' event to epoll");
-            let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); 1];
+            let mut events = [epoll::Event::new(epoll::Events::empty(), 0); 1];
             loop {
                 let num_events = match epoll::wait(epoll_fd, timeout * 1000_i32, &mut events[..]) {
                     Ok(num_events) => Ok(num_events),
@@ -252,7 +252,7 @@ impl DiskConfig for UbuntuDiskConfig {
             .join("ubuntu")
             .join("ci");
 
-        vec!["meta-data"].iter().for_each(|x| {
+        ["meta-data"].iter().for_each(|x| {
             rate_limited_copy(source_file_dir.join(x), cloud_init_directory.join(x))
                 .expect("Expect copying cloud-init meta-data to succeed");
         });
@@ -308,7 +308,7 @@ impl DiskConfig for UbuntuDiskConfig {
             .output()
             .expect("Expect creating disk image to succeed");
 
-        vec!["user-data", "meta-data", "network-config"]
+        ["user-data", "meta-data", "network-config"]
             .iter()
             .for_each(|x| {
                 std::process::Command::new("mcopy")

virtio-devices/src/vsock/unix/muxer.rs

@@ -971,7 +971,7 @@ mod tests {
             self.init_pkt(local_port, peer_port, uapi::VSOCK_OP_RESPONSE);
             self.send();
 
-            let mut buf = vec![0u8; 32];
+            let mut buf = [0u8; 32];
             let len = stream.read(&mut buf[..]).unwrap();
             assert_eq!(&buf[..len], format!("OK {local_port}\n").as_bytes());
 

vmm/src/serial_manager.rs

@@ -229,7 +229,7 @@ impl SerialManager {
                     const EPOLL_EVENTS_LEN: usize = 3;
 
                     let mut events =
-                        vec![epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
+                        [epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
 
                     loop {
                         let num_events = match epoll::wait(epoll_fd, timeout, &mut events[..]) {