// Wait blocks until the named container exits, returning the exit information.
func Wait(client dockerclient.Client, name string) (*dockerclient.ContainerInfo, error) {
defer func() {
client.StopContainer(name, 5)
client.KillContainer(name, "9")
}()
for attempts := 0; attempts < 5; attempts++ {
done := client.Wait(name)
<-done
info, err := client.InspectContainer(name)
if err != nil {
return nil, err
}
if !info.State.Running {
return info, nil
}
log.Debugf("attempting to resume waiting after %d attempts.\n", attempts)
}
return nil, errors.New("reached maximum wait attempts")
}
func (e *engine) runJobNotify(r *Task, client dockerclient.Client) error {
name := fmt.Sprintf("drone_build_%d_notify", r.Build.ID)
defer func() {
client.KillContainer(name, "9")
client.RemoveContainer(name, true, true)
}()
// encode the build payload to write to stdin
// when launching the build container
in, err := encodeToLegacyFormat(r)
if err != nil {
log.Errorf("failure to marshal work. %s", err)
return err
}
args := DefaultNotifyArgs
args = append(args, "--")
args = append(args, string(in))
conf := &dockerclient.ContainerConfig{
Image: DefaultAgent,
Entrypoint: DefaultEntrypoint,
Cmd: args,
Env: e.envs,
HostConfig: dockerclient.HostConfig{
Binds: []string{"/var/run/docker.sock:/var/run/docker.sock"},
MemorySwappiness: -1,
},
Volumes: map[string]struct{}{
"/var/run/docker.sock": struct{}{},
},
}
log.Infof("preparing container %s", name)
info, err := docker.Run(client, conf, name)
if err != nil {
log.Errorf("Error starting notification container %s. %s", name, err)
}
// for debugging purposes we print a failed notification executions
// output to the logs. Otherwise we have no way to troubleshoot failed
// notifications. This is temporary code until I've come up with
// a better solution.
if info != nil && info.State.ExitCode != 0 && log.GetLevel() >= log.InfoLevel {
var buf bytes.Buffer
rc, err := client.ContainerLogs(name, docker.LogOpts)
if err == nil {
defer rc.Close()
stdcopy.StdCopy(&buf, &buf, io.LimitReader(rc, 50000))
}
log.Infof("Notification container %s exited with %d", name, info.State.ExitCode)
log.Infoln(buf.String())
}
return err
}
func Run(client dockerclient.Client, conf *dockerclient.ContainerConfig, auth *dockerclient.AuthConfig, pull bool, outw, errw io.Writer) (*dockerclient.ContainerInfo, error) {
if outw == nil {
outw = os.Stdout
}
if errw == nil {
errw = os.Stdout
}
// fetches the container information.
info, err := Start(client, conf, auth, pull)
if err != nil {
return nil, err
}
// ensures the container is always stopped
// and ready to be removed.
defer func() {
client.StopContainer(info.Id, 5)
client.KillContainer(info.Id, "9")
}()
// channel listening for errors while the
// container is running async.
errc := make(chan error, 1)
infoc := make(chan *dockerclient.ContainerInfo, 1)
go func() {
// blocks and waits for the container to finish
// by streaming the logs (to /dev/null). Ideally
// we could use the `wait` function instead
rc, err := client.ContainerLogs(info.Id, logOptsTail)
if err != nil {
log.Errorf("Error tailing %s. %s\n", conf.Image, err)
errc <- err
return
}
defer rc.Close()
StdCopy(outw, errw, rc)
// fetches the container information
info, err := client.InspectContainer(info.Id)
if err != nil {
log.Errorf("Error getting exit code for %s. %s\n", conf.Image, err)
errc <- err
return
}
infoc <- info
}()
select {
case info := <-infoc:
return info, nil
case err := <-errc:
return info, err
}
}
// Wait blocks until the named container exits, returning the exit information.
func Wait(client dockerclient.Client, name string) (*dockerclient.ContainerInfo, error) {
defer func() {
client.StopContainer(name, 5)
client.KillContainer(name, "9")
}()
errc := make(chan error, 1)
infoc := make(chan *dockerclient.ContainerInfo, 1)
go func() {
// blocks and waits for the container to finish
// by streaming the logs (to /dev/null). Ideally
// we could use the `wait` function instead
rc, err := client.ContainerLogs(name, LogOptsTail)
if err != nil {
errc <- err
return
}
io.Copy(ioutil.Discard, rc)
rc.Close()
info, err := client.InspectContainer(name)
if err != nil {
errc <- err
return
}
infoc <- info
}()
select {
case info := <-infoc:
return info, nil
case err := <-errc:
return nil, err
}
}
func (e *engine) runJob(c context.Context, r *Task, updater *updater, client dockerclient.Client) error {
name := fmt.Sprintf("drone_build_%d_job_%d", r.Build.ID, r.Job.ID)
defer func() {
if r.Job.Status == model.StatusRunning {
r.Job.Status = model.StatusError
r.Job.Finished = time.Now().UTC().Unix()
r.Job.ExitCode = 255
}
if r.Job.Status == model.StatusPending {
r.Job.Status = model.StatusError
r.Job.Started = time.Now().UTC().Unix()
r.Job.Finished = time.Now().UTC().Unix()
r.Job.ExitCode = 255
}
updater.SetJob(c, r)
client.KillContainer(name, "9")
client.RemoveContainer(name, true, true)
}()
// marks the task as running
r.Job.Status = model.StatusRunning
r.Job.Started = time.Now().UTC().Unix()
// encode the build payload to write to stdin
// when launching the build container
in, err := encodeToLegacyFormat(r)
if err != nil {
log.Errorf("failure to marshal work. %s", err)
return err
}
// CREATE AND START BUILD
args := DefaultBuildArgs
if r.Build.Event == model.EventPull {
args = DefaultPullRequestArgs
}
args = append(args, "--")
args = append(args, string(in))
conf := &dockerclient.ContainerConfig{
Image: DefaultAgent,
Entrypoint: DefaultEntrypoint,
Cmd: args,
Env: e.envs,
HostConfig: dockerclient.HostConfig{
Binds: []string{"/var/run/docker.sock:/var/run/docker.sock"},
},
Volumes: map[string]struct{}{
"/var/run/docker.sock": struct{}{},
},
}
log.Infof("preparing container %s", name)
client.PullImage(conf.Image, nil)
_, err = docker.RunDaemon(client, conf, name)
if err != nil {
log.Errorf("error starting build container. %s", err)
return err
}
// UPDATE STATUS
err = updater.SetJob(c, r)
if err != nil {
log.Errorf("error updating job status as running. %s", err)
return err
}
// WAIT FOR OUTPUT
info, builderr := docker.Wait(client, name)
switch {
case info.State.ExitCode == 128:
r.Job.ExitCode = info.State.ExitCode
r.Job.Status = model.StatusKilled
case info.State.ExitCode == 130:
r.Job.ExitCode = info.State.ExitCode
r.Job.Status = model.StatusKilled
case builderr != nil:
r.Job.Status = model.StatusError
case info.State.ExitCode != 0:
r.Job.ExitCode = info.State.ExitCode
r.Job.Status = model.StatusFailure
default:
r.Job.Status = model.StatusSuccess
}
// send the logs to the datastore
var buf bytes.Buffer
rc, err := client.ContainerLogs(name, docker.LogOpts)
if err != nil && builderr != nil {
buf.WriteString("Error launching build")
buf.WriteString(builderr.Error())
} else if err != nil {
buf.WriteString("Error launching build")
buf.WriteString(err.Error())
log.Errorf("error opening connection to logs. %s", err)
return err
} else {
defer rc.Close()
stdcopy.StdCopy(&buf, &buf, io.LimitReader(rc, 5000000))
}
// update the task in the datastore
r.Job.Finished = time.Now().UTC().Unix()
err = updater.SetJob(c, r)
if err != nil {
log.Errorf("error updating job after completion. %s", err)
return err
}
err = updater.SetLogs(c, r, ioutil.NopCloser(&buf))
if err != nil {
log.Errorf("error updating logs. %s", err)
return err
}
log.Debugf("completed job %d with status %s.", r.Job.ID, r.Job.Status)
return nil
}
func Run(client dockerclient.Client, conf *dockerclient.ContainerConfig, auth *dockerclient.AuthConfig, pull bool, outw, errw io.Writer) (*dockerclient.ContainerInfo, error) {
if outw == nil {
outw = os.Stdout
}
if errw == nil {
errw = os.Stdout
}
// fetches the container information.
info, err := Start(client, conf, auth, pull)
if err != nil {
return nil, err
}
// ensures the container is always stopped
// and ready to be removed.
defer func() {
client.StopContainer(info.Id, 5)
client.KillContainer(info.Id, "9")
}()
// channel listening for errors while the
// container is running async.
errc := make(chan error, 1)
infoc := make(chan *dockerclient.ContainerInfo, 1)
go func() {
// options to fetch the stdout and stderr logs
// by tailing the output.
logOptsTail := &dockerclient.LogOptions{
Follow: true,
Stdout: true,
Stderr: true,
}
// It's possible that the docker logs endpoint returns before the container
// is done, we'll naively resume up to 5 times if when the logs unblocks
// the container is still reported to be running.
for attempts := 0; attempts < 5; attempts++ {
if attempts > 0 {
// When resuming the stream, only grab the last line when starting
// the tailing.
logOptsTail.Tail = 1
}
// blocks and waits for the container to finish
// by streaming the logs (to /dev/null). Ideally
// we could use the `wait` function instead
rc, err := client.ContainerLogs(info.Id, logOptsTail)
if err != nil {
log.Errorf("Error tailing %s. %s\n", conf.Image, err)
errc <- err
return
}
defer rc.Close()
_, err = StdCopy(outw, errw, rc)
if err != nil {
log.Errorf("Error streaming docker logs for %s. %s\n", conf.Image, err)
errc <- err
return
}
// fetches the container information
info, err := client.InspectContainer(info.Id)
if err != nil {
log.Errorf("Error getting exit code for %s. %s\n", conf.Image, err)
errc <- err
return
}
if !info.State.Running {
// The container is no longer running, there should be no more logs to tail.
infoc <- info
return
}
log.Debugf("Attempting to resume log tailing after %d attempts.\n", attempts)
}
errc <- errors.New("Maximum number of attempts made while tailing logs.")
}()
select {
case info := <-infoc:
return info, nil
case err := <-errc:
return info, err
}
}
func Run(client dockerclient.Client, conf *dockerclient.ContainerConfig, auth *dockerclient.AuthConfig, pull bool, outw, errw io.Writer) (*dockerclient.ContainerInfo, error) {
if outw == nil {
outw = os.Stdout
}
if errw == nil {
errw = os.Stdout
}
// fetches the container information.
info, err := Start(client, conf, auth, pull)
if err != nil {
return nil, err
}
// ensures the container is always stopped
// and ready to be removed.
defer func() {
client.StopContainer(info.Id, 5)
client.KillContainer(info.Id, "9")
}()
// channel listening for errors while the
// container is running async.
errc := make(chan error, 1)
infoc := make(chan *dockerclient.ContainerInfo, 1)
go func() {
// It's possible that the docker logs endpoint returns before the container
// is done, we'll naively resume up to 5 times if when the logs unblocks
// the container is still reported to be running.
var total int64
for attempts := 0; attempts < 5; attempts++ {
// blocks and waits for the container to finish
// by streaming the logs (to /dev/null). Ideally
// we could use the `wait` function instead
rc, err := client.ContainerLogs(info.Id, logOptsTail)
if err != nil {
log.Errorf("Error tailing %s. %s\n", conf.Image, err)
errc <- err
return
}
defer rc.Close()
if total != 0 {
// Discard off the total bytes we've received so far.
// io.LimitReader returns EOF once it has read the specified number
// of bytes as per https://golang.org/pkg/io/#LimitReader.
r := io.LimitReader(rc, total)
_, err := io.Copy(ioutil.Discard, r)
if err != nil && err != io.EOF {
log.Errorf("Error resuming streaming docker logs for %s. %s\n", conf.Image, err)
errc <- err
return
}
}
rcv, err := StdCopy(outw, errw, rc)
if err != nil {
log.Errorf("Error streaming docker logs for %s. %s\n", conf.Image, err)
errc <- err
return
}
// fetches the container information
info, err := client.InspectContainer(info.Id)
if err != nil {
log.Errorf("Error getting exit code for %s. %s\n", conf.Image, err)
errc <- err
return
}
if !info.State.Running {
// The container is no longer running, there should be no more logs to tail.
infoc <- info
return
}
total += rcv
log.Debugf("Attempting to resume log tailing after receiving %d bytes. Attempts %d.\n", total, attempts)
}
errc <- errors.New("Maximum number of attempts made while tailing logs.")
}()
select {
case info := <-infoc:
return info, nil
case err := <-errc:
return info, err
}
}