package compat import ( "net/http" "github.com/containers/podman/v4/libpod" "github.com/containers/podman/v4/libpod/define" "github.com/containers/podman/v4/pkg/api/handlers/utils" "github.com/containers/podman/v4/pkg/api/server/idle" api "github.com/containers/podman/v4/pkg/api/types" "github.com/gorilla/schema" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) func AttachContainer(w http.ResponseWriter, r *http.Request) { runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime) decoder := r.Context().Value(api.DecoderKey).(*schema.Decoder) query := struct { DetachKeys string `schema:"detachKeys"` Logs bool `schema:"logs"` Stream bool `schema:"stream"` Stdin bool `schema:"stdin"` Stdout bool `schema:"stdout"` Stderr bool `schema:"stderr"` }{ Stream: true, } if err := decoder.Decode(&query, r.URL.Query()); err != nil { utils.Error(w, "Error parsing parameters", http.StatusBadRequest, err) return } // Detach keys: explicitly set to "" is very different from unset // TODO: Our format for parsing these may be different from Docker. var detachKeys *string if _, found := r.URL.Query()["detachKeys"]; found { detachKeys = &query.DetachKeys } streams := new(libpod.HTTPAttachStreams) streams.Stdout = true streams.Stderr = true streams.Stdin = true useStreams := false if _, found := r.URL.Query()["stdin"]; found { streams.Stdin = query.Stdin useStreams = true } if _, found := r.URL.Query()["stdout"]; found { streams.Stdout = query.Stdout useStreams = true } if _, found := r.URL.Query()["stderr"]; found { streams.Stderr = query.Stderr useStreams = true } if !useStreams { streams = nil } if useStreams && !streams.Stdout && !streams.Stderr && !streams.Stdin { utils.Error(w, "Parameter conflict", http.StatusBadRequest, errors.Errorf("at least one of stdin, stdout, stderr must be true")) return } // At least one of these must be set if !query.Stream && !query.Logs { utils.Error(w, "Unsupported parameter", http.StatusBadRequest, errors.Errorf("at least one of Logs or Stream must be set")) return } name := utils.GetName(r) ctr, err := runtime.LookupContainer(name) if err != nil { utils.ContainerNotFound(w, name, err) return } state, err := ctr.State() if err != nil { utils.InternalServerError(w, err) return } // For Docker compatibility, we need to re-initialize containers in these states. if state == define.ContainerStateConfigured || state == define.ContainerStateExited { if err := ctr.Init(r.Context(), ctr.PodID() != ""); err != nil { utils.Error(w, "Container in wrong state", http.StatusConflict, errors.Wrapf(err, "error preparing container %s for attach", ctr.ID())) return } } else if !(state == define.ContainerStateCreated || state == define.ContainerStateRunning) { utils.InternalServerError(w, errors.Wrapf(define.ErrCtrStateInvalid, "can only attach to created or running containers - currently in state %s", state.String())) return } logErr := func(e error) { logrus.Error(errors.Wrapf(e, "error attaching to container %s", ctr.ID())) } // Perform HTTP attach. // HTTPAttach will handle everything about the connection from here on // (including closing it and writing errors to it). hijackChan := make(chan bool, 1) err = ctr.HTTPAttach(r, w, streams, detachKeys, nil, query.Stream, query.Logs, hijackChan) if <-hijackChan { // If connection was Hijacked, we have to signal it's being closed t := r.Context().Value(api.IdleTrackerKey).(*idle.Tracker) defer t.Close() if err != nil { // Cannot report error to client as a 500 as the Upgrade set status to 101 logErr(err) } } else { // If the Hijack failed we are going to assume we can still inform client of failure utils.InternalServerError(w, err) logErr(err) } logrus.Debugf("Attach for container %s completed successfully", ctr.ID()) }