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// Copyright 2026 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package vm
import (
"context"
"io"
"strings"
"testing"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/report"
"github.com/google/syzkaller/vm/vmimpl"
"github.com/stretchr/testify/assert"
)
type localInstancePool struct {
}
func (pool *localInstancePool) Count() int {
return 1
}
func (pool *localInstancePool) Create(_ context.Context, workdir string, index int) (vmimpl.Instance, error) {
return makeLocalInstance(workdir), nil
}
func (pool *localInstancePool) Close() error {
return nil
}
type localInstance struct {
merger *vmimpl.OutputMerger
workdir string
}
func makeLocalInstance(workdir string) *localInstance {
var tee io.Writer
// TODO: tee to t.Logf.
return &localInstance{
merger: vmimpl.NewOutputMerger(tee),
workdir: workdir,
}
}
func (inst *localInstance) Copy(hostSrc string) (string, error) {
return "", nil
}
func (inst *localInstance) Forward(port int) (string, error) {
return "", nil
}
func (inst *localInstance) Run(ctx context.Context, command string) (
<-chan vmimpl.Chunk, <-chan error, error) {
rpipe, wpipe, err := osutil.LongPipe()
if err != nil {
return nil, nil, err
}
rpipeErr, wpipeErr, err := osutil.LongPipe()
if err != nil {
rpipe.Close()
wpipe.Close()
return nil, nil, err
}
inst.merger.Add("ssh", vmimpl.OutputStdout, rpipe)
inst.merger.Add("ssh-err", vmimpl.OutputStderr, rpipeErr)
args := strings.Split(command, " ")
cmd := osutil.Command(args[0], args[1:]...)
cmd.Dir = inst.workdir
cmd.Stdout = wpipe
cmd.Stderr = wpipeErr
if err := cmd.Start(); err != nil {
wpipe.Close()
wpipeErr.Close()
return nil, nil, err
}
wpipe.Close()
wpipeErr.Close()
return vmimpl.Multiplex(ctx, cmd, inst.merger, vmimpl.MultiplexConfig{
Scale: 1,
})
}
func (inst *localInstance) Diagnose(rep *report.Report) ([]byte, bool) {
return nil, false
}
func (inst *localInstance) Close() error {
inst.merger.Wait()
return nil
}
func init() {
ctor := func(env *vmimpl.Env) (vmimpl.Pool, error) {
return &localInstancePool{}, nil
}
vmimpl.Register("test-local", vmimpl.Type{
Ctor: ctor,
Preemptible: true,
})
}
func TestMultipleRun(t *testing.T) {
inst, reporter := makeLinuxAMD64Futex(t, "test-local")
for i := 0; i < 3; i++ {
output, _, err := inst.Run(context.Background(), reporter,
`echo Hello`, WithExitCondition(ExitNormal))
assert.NoError(t, err)
assert.Equal(t, "Hello\n", string(output))
}
}
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