Method disk_new

cloud-hypervisor/tests/integration.rs:9682–9774

TODO Cleanup image file explicitly after test, if there's some space issues.

(&self, fs: u8, sz: usize)

        // TODO Cleanup image file explicitly after test, if there's some space issues.
        fn disk_new(&self, fs: u8, sz: usize) -> String {
            let mut guard = NEXT_DISK_ID.lock().unwrap();
            let id = *guard;
            *guard = id + 1;

            let img = PathBuf::from(format!("/tmp/test-hotplug-{id}.raw"));
            let _ = fs::remove_file(&img);

            // Create an image file
            let out = Command::new("qemu-img")
                .args([
                    "create",
                    "-f",
                    "raw",
                    img.to_str().unwrap(),
                    format!("{sz}m").as_str(),
                ])
                .output()
                .expect("qemu-img command failed")
                .stdout;
            println!("{out:?}");

            // Associate image to a loop device
            let out = Command::new("losetup")
                .args(["--show", "-f", img.to_str().unwrap()])
                .output()
                .expect("failed to create loop device")
                .stdout;
            let _tmp = String::from_utf8_lossy(&out);
            let loop_dev = _tmp.trim();
            println!("{out:?}");

            // Create a partition table
            // echo 'type=7' | sudo sfdisk "${LOOP}"
            let mut child = Command::new("sfdisk")
                .args([loop_dev])
                .stdin(Stdio::piped())
                .spawn()
                .unwrap();
            let stdin = child.stdin.as_mut().expect("failed to open stdin");
            stdin
                .write_all("type=7".as_bytes())
                .expect("failed to write stdin");
            let out = child.wait_with_output().expect("sfdisk failed").stdout;
            println!("{out:?}");

            // Disengage the loop device
            let out = Command::new("losetup")
                .args(["-d", loop_dev])
                .output()
                .expect("loop device not found")
                .stdout;
            println!("{out:?}");

            // Re-associate loop device pointing to the partition only
            let out = Command::new("losetup")
                .args([
                    "--show",