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// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
mod ch;
mod net;
use std::env::{args, current_dir};
use std::ffi::{CString, OsString};
use std::io::{self, ErrorKind};
use std::os::unix::prelude::*;
use std::path::PathBuf;
use std::process::{exit, Command};
use net::{format_mac, net_setup, NetConfig};
fn vm_command(dir: PathBuf) -> Result<Command, String> {
let dir = dir.into_os_string().into_vec();
let dir = PathBuf::from(OsString::from_vec(dir));
let vm_name = dir
.file_name()
.ok_or_else(|| "directory has no name".to_string())?;
if vm_name.as_bytes().contains(&b',') {
return Err(format!("VM name may not contain a comma: {:?}", vm_name));
}
let mut command = Command::new("s6-notifyoncheck");
command.args(&["-dc", "test -S env/cloud-hypervisor.sock"]);
command.arg("cloud-hypervisor");
command.args(&["--api-socket", "env/cloud-hypervisor.sock"]);
command.args(&["--cmdline", "console=ttyS0 root=/dev/vda"]);
command.args(&["--memory", "size=128M"]);
command.args(&["--console", "pty"]);
let mut net_providers_dir = PathBuf::new();
net_providers_dir.push("/ext/svc/data");
net_providers_dir.push(vm_name);
net_providers_dir.push("providers/net");
match net_providers_dir.read_dir() {
Ok(entries) => {
for r in entries {
let entry = r
.map_err(|e| format!("examining directory entry: {}", e))?
.file_name();
// Safe because prov is the name of a directory entry, so
// con't contain a null byte.
let provider_name = unsafe { CString::from_vec_unchecked(entry.into_vec()) };
// Safe because we pass a valid pointer and check the result.
let NetConfig { fd, mac } = unsafe { net_setup(provider_name.as_ptr()) };
if fd == -1 {
let e = io::Error::last_os_error();
return Err(format!("setting up networking failed: {}", e));
}
command
.arg("--net")
.arg(format!("fd={},mac={}", fd, format_mac(&mac)));
// TODO: to support multiple net providers, we'll need
// a better naming scheme for tap and bridge devices.
break;
}
}
Err(e) if e.kind() == ErrorKind::NotFound => {}
Err(e) => return Err(format!("reading directory {:?}: {}", net_providers_dir, e)),
}
command.arg("--kernel").arg({
let mut kernel = OsString::from("/ext/svc/data/");
kernel.push(&vm_name);
kernel.push("/vmlinux");
kernel
});
command.arg("--disk").arg({
let mut disk = OsString::from("path=/ext/svc/data/");
disk.push(&vm_name);
disk.push("/rootfs.ext4,readonly=on");
disk
});
command.arg("--serial").arg({
let mut serial = OsString::from("file=/run/");
serial.push(&vm_name);
serial.push(".log");
serial
});
Ok(command)
}
fn run() -> String {
let dir = match current_dir().map_err(|e| format!("getting current directory: {}", e)) {
Ok(dir) => dir,
Err(e) => return e,
};
match vm_command(dir) {
Ok(mut command) => format!("failed to exec: {}", command.exec()),
Err(e) => e,
}
}
fn main() {
let argv0_option = args().next();
let argv0 = argv0_option
.as_ref()
.map(String::as_str)
.unwrap_or("start-vm");
eprintln!("{}: {}", argv0, run());
exit(1);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_vm_name_comma() {
assert!(vm_command("/v,m".into()).unwrap_err().contains("comma"));
}
}
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