forked from snapcore/spread
/
qemu.go
144 lines (119 loc) · 3.18 KB
/
qemu.go
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package spread
import (
"fmt"
"math/rand"
"os"
"os/exec"
"strconv"
"golang.org/x/net/context"
)
func QEMU(p *Project, b *Backend, o *Options) Provider {
return &qemuProvider{p, b, o}
}
type qemuProvider struct {
project *Project
backend *Backend
options *Options
}
type qemuServer struct {
p *qemuProvider
d qemuServerData
system *System
address string
}
type qemuServerData struct {
PID int
}
func (s *qemuServer) String() string {
return s.system.String()
}
func (s *qemuServer) Label() string {
return s.system.String()
}
func (s *qemuServer) Provider() Provider {
return s.p
}
func (s *qemuServer) Address() string {
return s.address
}
func (s *qemuServer) System() *System {
return s.system
}
func (s *qemuServer) ReuseData() interface{} {
return &s.d
}
func (s *qemuServer) Discard(ctx context.Context) error {
p, err := os.FindProcess(s.d.PID)
if err != nil {
return nil // But never happens on Unix, per docs.
}
err = p.Kill()
// Ought to have a better way to distinguish the error. :-/
if err != nil && err.Error() == "os: process already finished" {
return nil
}
if err != nil {
return fmt.Errorf("cannot discard qemu %s: %v", s, err)
}
return nil
}
func (p *qemuProvider) Backend() *Backend {
return p.backend
}
func (p *qemuProvider) GarbageCollect() error {
return nil
}
func (p *qemuProvider) Reuse(ctx context.Context, rsystem *ReuseSystem, system *System) (Server, error) {
s := &qemuServer{
p: p,
system: system,
address: rsystem.Address,
}
err := rsystem.UnmarshalData(&s.d)
if err != nil {
return nil, fmt.Errorf("cannot unmarshal qemu reuse data: %v", err)
}
return s, nil
}
func systemPath(system *System) string {
return os.ExpandEnv("$HOME/.spread/qemu/" + system.Image + ".img")
}
func (p *qemuProvider) Allocate(ctx context.Context, system *System) (Server, error) {
// FIXME Find an available port more reliably.
port := 59301 + rand.Intn(99)
path := systemPath(system)
if info, err := os.Stat(path); err != nil || info.IsDir() {
return nil, &FatalError{fmt.Errorf("cannot find qemu image at %s", path)}
}
mem := 1500
if p.backend.Memory > 0 {
mem = int(p.backend.Memory / mb)
}
serial := fmt.Sprintf("telnet:127.0.0.1:%d,server,nowait", port+100)
monitor := fmt.Sprintf("telnet:127.0.0.1:%d,server,nowait", port+200)
fwd := fmt.Sprintf("user,hostfwd=tcp:127.0.0.1:%d-:22", port)
cmd := exec.Command("qemu-system-x86_64", "-enable-kvm", "-snapshot", "-m", strconv.Itoa(mem), "-net", "nic", "-net", fwd, "-serial", serial, "-monitor", monitor, path)
if os.Getenv("SPREAD_QEMU_GUI") != "1" {
cmd.Args = append([]string{cmd.Args[0], "-nographic"}, cmd.Args[1:]...)
}
printf("Serial and monitor for %s available at ports %d and %d.", system, port+100, port+200)
err := cmd.Start()
if err != nil {
return nil, &FatalError{fmt.Errorf("cannot launch qemu %s: %v", system, err)}
}
s := &qemuServer{
p: p,
d: qemuServerData{
PID: cmd.Process.Pid,
},
system: system,
address: "localhost:" + strconv.Itoa(port),
}
printf("Waiting for %s to make SSH available...", system)
if err := waitPortUp(ctx, system, s.address); err != nil {
s.Discard(ctx)
return nil, err
}
printf("Allocated %s.", s)
return s, nil
}