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docker: use a docker API client instead of a subshell (#201)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| package dctr | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
|
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| "github.com/docker/docker/api/types" | ||
| "github.com/docker/docker/api/types/container" | ||
| "github.com/docker/docker/api/types/network" | ||
| "github.com/docker/docker/client" | ||
| specs "github.com/opencontainers/image-spec/specs-go/v1" | ||
| ) | ||
|
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| // Docker Container client. | ||
| type Client interface { | ||
| ImagePull(ctx context.Context, image string, options types.ImagePullOptions) (io.ReadCloser, error) | ||
|
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| ContainerList(ctx context.Context, options types.ContainerListOptions) ([]types.Container, error) | ||
| ContainerInspect(ctx context.Context, containerID string) (types.ContainerJSON, error) | ||
| ContainerRemove(ctx context.Context, id string, options types.ContainerRemoveOptions) error | ||
| ContainerCreate(ctx context.Context, config *container.Config, hostConfig *container.HostConfig, networkingConfig *network.NetworkingConfig, platform *specs.Platform, containerName string) (container.ContainerCreateCreatedBody, error) | ||
| ContainerStart(ctx context.Context, containerID string, options types.ContainerStartOptions) error | ||
| } | ||
|
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| // A simplified remove-container-if-necessary helper. | ||
| func RemoveIfNecessary(ctx context.Context, c Client, name string) error { | ||
| container, err := c.ContainerInspect(ctx, name) | ||
| if err != nil { | ||
| if client.IsErrNotFound(err) { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
| if container.ContainerJSONBase == nil { | ||
| return nil | ||
| } | ||
|
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| return c.ContainerRemove(ctx, container.ID, types.ContainerRemoveOptions{ | ||
| Force: true, | ||
| }) | ||
| } | ||
|
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| // A simplified run-container-and-detach helper for background support containers (like socat and the registry). | ||
| func Run(ctx context.Context, c Client, name string, config *container.Config, hostConfig *container.HostConfig, networkingConfig *network.NetworkingConfig) error { | ||
|
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| ctr, err := c.ContainerInspect(ctx, name) | ||
| if err == nil && (ctr.ContainerJSONBase != nil && ctr.State.Running) { | ||
| // The service is already running! | ||
| return nil | ||
| } else if err == nil { | ||
| // The service exists, but is not running | ||
| err := c.ContainerRemove(ctx, name, types.ContainerRemoveOptions{Force: true}) | ||
| if err != nil { | ||
| return fmt.Errorf("creating %s: %v", name, err) | ||
| } | ||
| } else if !client.IsErrNotFound(err) { | ||
| return fmt.Errorf("inspecting %s: %v", name, err) | ||
| } | ||
|
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| resp, err := c.ContainerCreate(ctx, config, hostConfig, networkingConfig, nil, name) | ||
| if err != nil { | ||
| if !client.IsErrNotFound(err) { | ||
| return fmt.Errorf("creating %s: %v", name, err) | ||
| } | ||
|
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| err := pull(ctx, c, config.Image) | ||
| if err != nil { | ||
| return fmt.Errorf("pulling image %s: %v", config.Image, err) | ||
| } | ||
|
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||
| resp, err = c.ContainerCreate(ctx, config, hostConfig, networkingConfig, nil, name) | ||
| if err != nil { | ||
| return fmt.Errorf("creating %s: %v", name, err) | ||
| } | ||
| } | ||
|
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| id := resp.ID | ||
| err = c.ContainerStart(ctx, id, types.ContainerStartOptions{}) | ||
| if err != nil { | ||
| return fmt.Errorf("starting %s: %v", name, err) | ||
| } | ||
| return nil | ||
| } | ||
|
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| func pull(ctx context.Context, c Client, image string) error { | ||
| resp, err := c.ImagePull(ctx, image, types.ImagePullOptions{}) | ||
| if err != nil { | ||
| return fmt.Errorf("pulling image %s: %v", image, err) | ||
| } | ||
| defer resp.Close() | ||
|
|
||
| _, _ = io.Copy(ioutil.Discard, resp) | ||
| return nil | ||
| } |
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