Move gen_sock() helper into util module

Move the gen_sock() helper function into the util module, where it will
be accessible by more than just the qemu module. Also switch over to
using std::env::temp_dir() for retrieving the path to the hosts temp
directory instead of hard coding it.

Signed-off-by: Daniel Müller <deso@posteo.net>

src/lib.rs

@@ -16,3 +16,4 @@ pub use crate::vmtest::*;
 
 mod qemu;
 mod qga;
+mod util;

src/qemu.rs

@@ -20,13 +20,13 @@ use std::time::Duration;
 use anyhow::{anyhow, bail, Context, Result};
 use log::{debug, log_enabled, warn, Level};
 use qapi::{qga, qmp, Qmp};
-use rand::Rng;
 use serde_derive::Serialize;
 use tempfile::{Builder, NamedTempFile};
 use tinytemplate::{format_unescaped, TinyTemplate};
 
 use crate::output::Output;
 use crate::qga::QgaWrapper;
+use crate::util::gen_sock;
 use crate::{Mount, Target, VMConfig};
 
 const INIT_TEMPLATE: &str = include_str!("init/init.sh.template");
@@ -118,13 +118,6 @@ fn host_supports_kvm(arch: &str) -> bool {
     arch == ARCH && Path::new("/dev/kvm").exists()
 }
 
-// Generate a path to a randomly named socket
-fn gen_sock(prefix: &str) -> PathBuf {
-    let id = rand::thread_rng().gen_range(100_000..1_000_000);
-    let sock = format!("/tmp/{prefix}-{id}.sock");
-    PathBuf::from(sock)
-}
-
 // Given a guest temp dir and a host init path, generate the path to the init file
 // in the guest.
 // This path is the one that will be passed to the guest via the kernel's `init=` parameter.

src/util.rs

@@ -0,0 +1,11 @@
+use std::env::temp_dir;
+use std::path::PathBuf;
+
+use rand::Rng as _;
+
+
+/// Generate a path to a randomly named socket
+pub(crate) fn gen_sock(prefix: &str) -> PathBuf {
+  let id = rand::thread_rng().gen_range(100_000..1_000_000);
+  temp_dir().join(format!("{prefix}-{id}.sock"))
+}