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| | // SPDX-License-Identifier: EUPL-1.2+
// SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
mod ch;
mod net;
use std::borrow::Cow;
use std::env::args_os;
use std::ffi::{CString, OsStr, OsString};
use std::io::{self, ErrorKind};
use std::os::unix::prelude::*;
use std::path::{Path, PathBuf};
use std::process::Command;
use net::{format_mac, net_setup, NetConfig};
pub fn prog_name() -> String {
args_os()
.next()
.as_ref()
.map(Path::new)
.and_then(Path::file_name)
.map(OsStr::to_string_lossy)
.unwrap_or(Cow::Borrowed("start-vm"))
.into_owned()
}
pub fn vm_command(dir: PathBuf, config_root: &Path) -> 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 config_dir = config_root.join(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=PARTLABEL=root"]);
command.args(&["--memory", "size=128M,shared=on"]);
command.args(&["--console", "pty"]);
command.arg("--kernel");
command.arg(config_dir.join("vmlinux"));
let net_providers_dir = config_dir.join("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 provider_name is the name of a directory entry, so
// can'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("--disk");
let blk_dir = config_dir.join("blk");
match blk_dir.read_dir() {
Ok(entries) => {
for result in entries {
let entry = result
.map_err(|e| format!("examining directory entry: {}", e))?
.path();
if entry.extension() != Some(OsStr::new("img")) {
continue;
}
if entry.as_os_str().as_bytes().contains(&b',') {
return Err(format!("illegal ',' character in path {:?}", entry));
}
let mut arg = OsString::from("path=");
arg.push(entry);
arg.push(",readonly=on");
command.arg(arg);
}
}
Err(e) => return Err(format!("reading directory {:?}: {}", blk_dir, e)),
}
if command.get_args().last() == Some(OsStr::new("--disk")) {
return Err("no block devices specified".to_string());
}
let shared_dirs_dir = config_dir.join("shared-dirs");
match shared_dirs_dir.read_dir().map(Iterator::peekable) {
Ok(mut entries) => {
if entries.peek().is_some() {
command.arg("--fs");
}
for result in entries {
let entry = result
.map_err(|e| format!("examining directory entry: {}", e))?
.file_name();
let mut arg = OsString::from("tag=");
arg.push(&entry);
arg.push(",socket=../");
arg.push(vm_name);
arg.push("-fs-");
arg.push(&entry);
arg.push("/env/virtiofsd.sock");
command.arg(arg);
}
}
Err(e) if e.kind() == ErrorKind::NotFound => {}
Err(e) => return Err(format!("reading directory {:?}: {}", shared_dirs_dir, e)),
}
command.arg("--serial").arg({
let mut serial = OsString::from("file=/run/");
serial.push(&vm_name);
serial.push(".log");
serial
});
Ok(command)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_vm_name_comma() {
assert!(vm_command("/v,m".into(), Path::new("/"))
.unwrap_err()
.contains("comma"));
}
}
|