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|
//! An abstraction on top of the libvirt bindings.
use crate::util::wait_for_ssh;
use log::debug;
use std::path::Path;
use std::thread;
use std::time::Duration;
use virt::connect::Connect;
use virt::domain::{
Domain, VIR_DOMAIN_AFFECT_CONFIG, VIR_DOMAIN_AFFECT_CURRENT, VIR_DOMAIN_AFFECT_LIVE,
};
/// Errors from this module.
#[derive(Debug, thiserror::Error)]
pub enum VirtError {
/// Error creating virtual machine.
#[error(transparent)]
VirtError(#[from] virt::error::Error),
/// Error doing I/O.
#[error(transparent)]
IoError(#[from] std::io::Error),
}
/// Access libvirt for all the things this program needs.
pub struct Libvirt {
conn: Connect,
}
impl Libvirt {
pub fn connect(url: &str) -> Result<Self, VirtError> {
debug!("connecting to libvirtd {}", url);
let conn = Connect::open(url)?;
Ok(Self { conn })
}
fn get_domains(&self) -> Result<Vec<Domain>, VirtError> {
debug!("listing all domains");
Ok(self.conn.list_all_domains(0)?)
}
fn get_domain(&self, name: &str) -> Result<Option<Domain>, VirtError> {
for domain in self.get_domains()? {
if domain.get_name()? == name {
return Ok(Some(domain));
}
}
Ok(None)
}
pub fn names(&self) -> Result<Vec<String>, VirtError> {
let mut ret = vec![];
for domain in self.get_domains()? {
ret.push(domain.get_name()?);
}
Ok(ret)
}
pub fn is_active(&self, name: &str) -> Result<bool, VirtError> {
if let Some(domain) = self.get_domain(name)? {
Ok(domain.is_active()?)
} else {
Ok(false)
}
}
pub fn wait_for_inactive(&self, name: &str) -> Result<(), VirtError> {
loop {
if !self.is_active(name)? {
break;
}
}
Ok(())
}
pub fn detach_cloud_init_iso(&self, name: &str) -> Result<(), VirtError> {
if let Some(domain) = self.get_domain(name)? {
debug!("detaching cloud-init ISO from {}", name);
let xml = domain.get_xml_desc(0)?;
let disk = find_iso_xml(&xml);
let flags =
VIR_DOMAIN_AFFECT_CONFIG | VIR_DOMAIN_AFFECT_CURRENT | VIR_DOMAIN_AFFECT_LIVE;
if disk.len() > 0 {
domain.detach_device_flags(&disk, flags)?;
}
}
Ok(())
}
pub fn trigger_start(&self, name: &str) -> Result<(), VirtError> {
if let Some(domain) = self.get_domain(name)? {
if !domain.is_active()? {
debug!("starting {}", name);
domain.create()?;
}
}
Ok(())
}
pub fn start(&self, name: &str) -> Result<(), VirtError> {
if let Some(_) = self.get_domain(name)? {
self.trigger_start(name)?;
wait_for_ssh(name);
}
Ok(())
}
pub fn trigger_shutdown(&self, name: &str) -> Result<(), VirtError> {
if let Some(domain) = self.get_domain(name)? {
debug!("asking {} to shut down", name);
if domain.is_active()? {
domain.shutdown()?;
}
}
Ok(())
}
pub fn shutdown(&self, name: &str) -> Result<(), VirtError> {
if let Some(domain) = self.get_domain(name)? {
debug!("shutting down {}", name);
self.trigger_shutdown(name)?;
wait_until_inactive(&domain, name);
}
Ok(())
}
pub fn delete(&self, name: &str, image: &Path) -> Result<(), VirtError> {
if let Some(domain) = self.get_domain(name)? {
self.shutdown(name)?;
debug!("undefine {}", name);
domain.undefine()?;
debug!("removing image file {}", image.display());
std::fs::remove_file(image)?;
}
Ok(())
}
pub fn set_autostart(&self, name: &str, autostart: bool) -> Result<(), VirtError> {
if let Some(domain) = self.get_domain(name)? {
domain.set_autostart(autostart)?;
}
Ok(())
}
}
fn wait_until_inactive(domain: &Domain, name: &str) {
debug!("waiting for domain {} to become inactive", name);
let briefly = Duration::from_millis(1000);
loop {
thread::sleep(briefly);
match domain.is_active() {
Ok(true) => (),
Ok(false) => break,
Err(err) => {
debug!("is_active: {}", err);
}
}
debug!("domain {} is still running", name);
}
}
// This is a HACK. The XML description of a domain contains
// descriptions of attached virtual disks. We find one that contains
// ".iso", and return that.
//
// <disk type='file' device='disk'>
// <driver name='qemu' type='raw'/>
// <source file='/tmp/.tmp2rAiVW/cloudinit.iso'/>
// <backingStore/>
// <target dev='vdb' bus='virtio'/>
// <readonly/>
// <alias name='virtio-disk1'/>
// <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
// </disk>
fn find_iso_xml(xml: &str) -> String {
let mut xml = xml;
loop {
let start = xml.find("<disk ");
if start.is_none() {
break;
}
let start = start.unwrap();
xml = &xml[start..];
let end = xml.find("</disk>");
if end.is_none() {
break;
}
let end = end.unwrap();
let disk = &xml[..end + 7];
if let Some(_) = disk.find(".iso") {
return disk.to_string();
}
xml = &xml[end..];
}
"".to_string()
}
|
