1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use crate::{image::QEMU_IMG_DEFAULT_FORMAT, launcher, storage::StorageHandler};
use anyhow::{anyhow, Result};
use std::path::PathBuf;

const QEMU_BIN_NAME: &str = "qemu-system-x86_64";

macro_rules! append_vec {
    ( $v:expr, $( $x:expr ),* ) => {
        {
            $(
                $v.push($x.into());
            )*
        }
    };
}

macro_rules! into_vec {
    ( $( $x:expr ),* ) => {
        {
            let mut temp_vec = Vec::new();

            $(
                temp_vec.push($x.into());
            )*

            temp_vec
        }
    };
}

pub struct Emulator {}

impl Emulator {
    fn hostfwd_rules(&self, vm_name: &str, rc: &launcher::RuntimeConfig) -> Result<String> {
        let config = rc.dsh.config(vm_name)?;
        config.check_ports()?;
        let mut res = String::new();
        for (host, guest) in config.ports {
            res += &format!(",hostfwd=tcp:127.0.0.1:{}-:{}", host, guest);
        }

        Ok(res)
    }

    fn cdrom_rules(&self, v: &mut Vec<String>, disk: Option<PathBuf>, index: u8) -> Result<()> {
        if let Some(cd) = disk {
            match std::fs::metadata(&cd) {
                Ok(_) => {
                    append_vec!(
                        v,
                        "-drive",
                        format!("file={},media=cdrom,index={}", cd.display(), index)
                    );
                }
                Err(e) => return Err(anyhow!("error locating cdrom file: {}", e)),
            }
        }
        Ok(())
    }

    fn display_rule(&self, v: &mut Vec<String>, headless: bool) {
        append_vec!(v, "-display");
        if !headless {
            append_vec!(v, "gtk");
        } else {
            append_vec!(v, "none");
        }
    }
}

impl launcher::Emulator for Emulator {
    fn args(&self, vm_name: &str, rc: &launcher::RuntimeConfig) -> Result<Vec<String>> {
        let config = rc.dsh.config(vm_name)?;
        if config.valid().is_ok() {
            let disk_list = rc.dsh.disk_list(vm_name)?;
            let mut disks = Vec::new();
            for (x, disk) in disk_list.iter().enumerate() {
                disks.push("-drive".to_string());
                disks.push(format!(
                    "driver={},if={},file={},cache=none,media=disk,index={}",
                    QEMU_IMG_DEFAULT_FORMAT,
                    config.machine.image_interface,
                    disk.display(),
                    x
                ));
            }

            let mon = rc.dsh.monitor_path(vm_name)?;

            let mut v: Vec<String> = into_vec![
                "-nodefaults",
                "-chardev",
                format!("socket,server=on,wait=off,id=char0,path={}", mon.display()),
                "-mon",
                "chardev=char0,mode=control,pretty=on",
                "-machine",
                "accel=kvm",
                "-vga",
                config.machine.vga,
                "-m",
                format!("{}M", config.machine.memory),
                "-cpu",
                config.machine.cpu_type,
                "-smp",
                format!(
                    "cpus={},cores={},maxcpus={}",
                    config.machine.cpus, config.machine.cpus, config.machine.cpus
                ),
                "-nic",
                format!("user{}", self.hostfwd_rules(vm_name, rc)?)
            ];

            v.append(&mut disks);

            self.display_rule(&mut v, rc.headless);
            self.cdrom_rules(&mut v, rc.cdrom.clone(), (disks.len() + 2) as u8)?;
            self.cdrom_rules(&mut v, rc.extra_disk.clone(), (disks.len() + 3) as u8)?;

            Ok(v)
        } else {
            Err(anyhow!("vm configuration is invalid: {:?}", config.valid(),))
        }
    }

    fn bin(&self) -> Result<String> {
        Ok(QEMU_BIN_NAME.to_string())
    }
}