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monitor: Enable to exec into the container
Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,216 @@ | ||
| package build | ||
|
|
||
| import ( | ||
| "context" | ||
| _ "crypto/sha256" // ensure digests can be computed | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "sync" | ||
| "sync/atomic" | ||
| "syscall" | ||
|
|
||
| controllerapi "github.com/docker/buildx/controller/pb" | ||
| "github.com/moby/buildkit/client" | ||
| "github.com/moby/buildkit/exporter/containerimage/exptypes" | ||
| gateway "github.com/moby/buildkit/frontend/gateway/client" | ||
| "github.com/moby/buildkit/solver/pb" | ||
| specs "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "github.com/pkg/errors" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // ResultContext is a build result with the client that built it. | ||
| type ResultContext struct { | ||
| Client *client.Client | ||
| Res *gateway.Result | ||
| } | ||
|
|
||
| type Container struct { | ||
| cancelOnce sync.Once | ||
| containerCancel func() | ||
|
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| isUnavailable atomic.Bool | ||
|
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| initStarted atomic.Bool | ||
|
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| container gateway.Container | ||
| image *specs.Image | ||
|
|
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| releaseCh chan struct{} | ||
| } | ||
|
|
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| func NewContainer(ctx context.Context, resultCtx *ResultContext) (*Container, error) { | ||
| c, res := resultCtx.Client, resultCtx.Res | ||
|
|
||
| mainCtx := ctx | ||
|
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| ctrCh := make(chan *Container) | ||
| errCh := make(chan error) | ||
| go func() { | ||
| _, err := c.Build(context.TODO(), client.SolveOpt{}, "buildx", func(ctx context.Context, c gateway.Client) (*gateway.Result, error) { | ||
| ctx, cancel := context.WithCancel(ctx) | ||
| go func() { | ||
| <-mainCtx.Done() | ||
| cancel() | ||
| }() | ||
|
|
||
| if res.Ref == nil { | ||
| return nil, errors.Errorf("no reference is registered") | ||
| } | ||
| st, err := res.Ref.ToState() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| def, err := st.Marshal(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| imgRef, err := c.Solve(ctx, gateway.SolveRequest{ | ||
| Definition: def.ToPB(), | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| containerCtx, containerCancel := context.WithCancel(ctx) | ||
| defer containerCancel() | ||
| bkContainer, err := c.NewContainer(containerCtx, gateway.NewContainerRequest{ | ||
| Mounts: []gateway.Mount{ | ||
| { | ||
| Dest: "/", | ||
| MountType: pb.MountType_BIND, | ||
| Ref: imgRef.Ref, | ||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| imgData := res.Metadata[exptypes.ExporterImageConfigKey] | ||
| var img *specs.Image | ||
| if len(imgData) > 0 { | ||
| img = &specs.Image{} | ||
| if err := json.Unmarshal(imgData, img); err != nil { | ||
| fmt.Println(err) | ||
| return nil, err | ||
| } | ||
| } | ||
| releaseCh := make(chan struct{}) | ||
| container := &Container{ | ||
| containerCancel: containerCancel, | ||
| container: bkContainer, | ||
| image: img, | ||
| releaseCh: releaseCh, | ||
| } | ||
| ctrCh <- container | ||
| <-container.releaseCh | ||
|
|
||
| return nil, bkContainer.Release(ctx) | ||
| }, nil) | ||
| if err != nil { | ||
| errCh <- err | ||
| } | ||
| }() | ||
| select { | ||
| case ctr := <-ctrCh: | ||
| return ctr, nil | ||
| case err := <-errCh: | ||
| return nil, err | ||
| case <-mainCtx.Done(): | ||
| return nil, mainCtx.Err() | ||
| } | ||
| } | ||
|
|
||
| func (c *Container) Cancel() { | ||
| c.markUnavailable() | ||
| c.cancelOnce.Do(func() { | ||
| if c.containerCancel != nil { | ||
| c.containerCancel() | ||
| } | ||
| close(c.releaseCh) | ||
| }) | ||
| } | ||
|
|
||
| func (c *Container) IsUnavailable() bool { | ||
| return c.isUnavailable.Load() | ||
| } | ||
|
|
||
| func (c *Container) markUnavailable() { | ||
| c.isUnavailable.Store(true) | ||
| } | ||
|
|
||
| func (c *Container) Exec(ctx context.Context, cfg *controllerapi.InvokeConfig, stdin io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) error { | ||
| if isInit := c.initStarted.CompareAndSwap(false, true); isInit { | ||
| defer func() { | ||
| // container can't be used after init exits | ||
| c.markUnavailable() | ||
| }() | ||
| } | ||
| err := exec(ctx, cfg, c.container, c.image, stdin, stdout, stderr) | ||
| if err != nil { | ||
| // Container becomes unavailable if one of the processes fails in it. | ||
| c.markUnavailable() | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| func exec(ctx context.Context, cfg *controllerapi.InvokeConfig, ctr gateway.Container, img *specs.Image, stdin io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) error { | ||
| user := "" | ||
| if !cfg.NoUser { | ||
| user = cfg.User | ||
| } else if img != nil { | ||
| user = img.Config.User | ||
| } | ||
|
|
||
| cwd := "" | ||
| if !cfg.NoCwd { | ||
| cwd = cfg.Cwd | ||
| } else if img != nil { | ||
| cwd = img.Config.WorkingDir | ||
| } | ||
|
|
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| env := []string{} | ||
| if img != nil { | ||
| env = append(env, img.Config.Env...) | ||
| } | ||
| env = append(env, cfg.Env...) | ||
|
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||
| args := []string{} | ||
| if cfg.Entrypoint != nil { | ||
| args = append(args, cfg.Entrypoint...) | ||
| } | ||
| if cfg.Cmd != nil { | ||
| args = append(args, cfg.Cmd...) | ||
| } | ||
| // caller should always set args | ||
| if len(args) == 0 { | ||
| return errors.Errorf("specify args to execute") | ||
| } | ||
| proc, err := ctr.Start(ctx, gateway.StartRequest{ | ||
| Args: args, | ||
| Env: env, | ||
| User: user, | ||
| Cwd: cwd, | ||
| Tty: cfg.Tty, | ||
| Stdin: stdin, | ||
| Stdout: stdout, | ||
| Stderr: stderr, | ||
| }) | ||
| if err != nil { | ||
| return errors.Errorf("failed to start container: %v", err) | ||
| } | ||
|
|
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| doneCh := make(chan struct{}) | ||
| defer close(doneCh) | ||
| go func() { | ||
| select { | ||
| case <-ctx.Done(): | ||
| if err := proc.Signal(ctx, syscall.SIGKILL); err != nil { | ||
| logrus.Warnf("failed to kill process: %v", err) | ||
| } | ||
| case <-doneCh: | ||
| } | ||
| }() | ||
|
|
||
| return proc.Wait() | ||
| } |
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