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package dockerfile // import "github.com/docker/docker/builder/dockerfile"
import (
"context"
"fmt"
"io"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/builder"
containerpkg "github.com/docker/docker/container"
"github.com/docker/docker/pkg/stringid"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type containerManager struct {
tmpContainers map[string]struct{}
backend builder.ExecBackend
}
// newContainerManager creates a new container backend
func newContainerManager(docker builder.ExecBackend) *containerManager {
return &containerManager{
backend: docker,
tmpContainers: make(map[string]struct{}),
}
}
// Create a container
func (c *containerManager) Create(runConfig *container.Config, hostConfig *container.HostConfig) (container.ContainerCreateCreatedBody, error) {
container, err := c.backend.ContainerCreateIgnoreImagesArgsEscaped(types.ContainerCreateConfig{
Config: runConfig,
HostConfig: hostConfig,
})
if err != nil {
return container, err
}
c.tmpContainers[container.ID] = struct{}{}
return container, nil
}
var errCancelled = errors.New("build cancelled")
// Run a container by ID
func (c *containerManager) Run(ctx context.Context, cID string, stdout, stderr io.Writer) (err error) {
attached := make(chan struct{})
errCh := make(chan error, 1)
go func() {
errCh <- c.backend.ContainerAttachRaw(cID, nil, stdout, stderr, true, attached)
}()
select {
case err := <-errCh:
return err
case <-attached:
}
finished := make(chan struct{})
cancelErrCh := make(chan error, 1)
go func() {
select {
case <-ctx.Done():
logrus.Debugln("Build cancelled, killing and removing container:", cID)
c.backend.ContainerKill(cID, 0)
c.removeContainer(cID, stdout)
cancelErrCh <- errCancelled
case <-finished:
cancelErrCh <- nil
}
}()
if err := c.backend.ContainerStart(cID, nil, "", ""); err != nil {
close(finished)
logCancellationError(cancelErrCh, "error from ContainerStart: "+err.Error())
return err
}
// Block on reading output from container, stop on err or chan closed
if err := <-errCh; err != nil {
close(finished)
logCancellationError(cancelErrCh, "error from errCh: "+err.Error())
return err
}
waitC, err := c.backend.ContainerWait(ctx, cID, containerpkg.WaitConditionNotRunning)
if err != nil {
close(finished)
logCancellationError(cancelErrCh, fmt.Sprintf("unable to begin ContainerWait: %s", err))
return err
}
if status := <-waitC; status.ExitCode() != 0 {
close(finished)
logCancellationError(cancelErrCh,
fmt.Sprintf("a non-zero code from ContainerWait: %d", status.ExitCode()))
return &statusCodeError{code: status.ExitCode(), err: status.Err()}
}
close(finished)
return <-cancelErrCh
}
func logCancellationError(cancelErrCh chan error, msg string) {
if cancelErr := <-cancelErrCh; cancelErr != nil {
logrus.Debugf("Build cancelled (%v): %s", cancelErr, msg)
}
}
type statusCodeError struct {
code int
err error
}
func (e *statusCodeError) Error() string {
if e.err == nil {
return ""
}
return e.err.Error()
}
func (e *statusCodeError) StatusCode() int {
return e.code
}
func (c *containerManager) removeContainer(containerID string, stdout io.Writer) error {
rmConfig := &types.ContainerRmConfig{
ForceRemove: true,
RemoveVolume: true,
}
if err := c.backend.ContainerRm(containerID, rmConfig); err != nil {
fmt.Fprintf(stdout, "Error removing intermediate container %s: %v\n", stringid.TruncateID(containerID), err)
return err
}
return nil
}
// RemoveAll containers managed by this container manager
func (c *containerManager) RemoveAll(stdout io.Writer) {
for containerID := range c.tmpContainers {
if err := c.removeContainer(containerID, stdout); err != nil {
return
}
delete(c.tmpContainers, containerID)
fmt.Fprintf(stdout, "Removing intermediate container %s\n", stringid.TruncateID(containerID))
}
}
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