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package compat
import (
"encoding/json"
"fmt"
"net/http"
"strings"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/libpod/define"
"github.com/containers/libpod/pkg/api/handlers"
"github.com/containers/libpod/pkg/api/handlers/utils"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ExecCreateHandler creates an exec session for a given container.
func ExecCreateHandler(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value("runtime").(*libpod.Runtime)
input := new(handlers.ExecCreateConfig)
if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
utils.InternalServerError(w, errors.Wrapf(err, "error decoding request body as JSON"))
return
}
ctrName := utils.GetName(r)
ctr, err := runtime.LookupContainer(ctrName)
if err != nil {
utils.ContainerNotFound(w, ctrName, err)
return
}
libpodConfig := new(libpod.ExecConfig)
libpodConfig.Command = input.Cmd
libpodConfig.Terminal = input.Tty
libpodConfig.AttachStdin = input.AttachStdin
libpodConfig.AttachStderr = input.AttachStderr
libpodConfig.AttachStdout = input.AttachStdout
if input.DetachKeys != "" {
libpodConfig.DetachKeys = &input.DetachKeys
}
libpodConfig.Environment = make(map[string]string)
for _, envStr := range input.Env {
split := strings.SplitN(envStr, "=", 2)
if len(split) != 2 {
utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest, errors.Errorf("environment variable %q badly formed, must be key=value", envStr))
return
}
libpodConfig.Environment[split[0]] = split[1]
}
libpodConfig.WorkDir = input.WorkingDir
libpodConfig.Privileged = input.Privileged
libpodConfig.User = input.User
sessID, err := ctr.ExecCreate(libpodConfig)
if err != nil {
if errors.Cause(err) == define.ErrCtrStateInvalid {
// Check if the container is paused. If so, return a 409
state, err := ctr.State()
if err == nil {
// Ignore the error != nil case. We're already
// throwing an InternalServerError below.
if state == define.ContainerStatePaused {
utils.Error(w, "Container is paused", http.StatusConflict, errors.Errorf("cannot create exec session as container %s is paused", ctr.ID()))
return
}
}
}
utils.InternalServerError(w, err)
return
}
resp := new(handlers.ExecCreateResponse)
resp.ID = sessID
utils.WriteResponse(w, http.StatusCreated, resp)
}
// ExecInspectHandler inspects a given exec session.
func ExecInspectHandler(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value("runtime").(*libpod.Runtime)
sessionID := mux.Vars(r)["id"]
sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
if err != nil {
utils.Error(w, fmt.Sprintf("No such exec session: %s", sessionID), http.StatusNotFound, err)
return
}
logrus.Debugf("Inspecting exec session %s of container %s", sessionID, sessionCtr.ID())
session, err := sessionCtr.ExecSession(sessionID)
if err != nil {
utils.InternalServerError(w, errors.Wrapf(err, "error retrieving exec session %s from container %s", sessionID, sessionCtr.ID()))
return
}
inspectOut, err := session.Inspect()
if err != nil {
utils.InternalServerError(w, err)
return
}
utils.WriteResponse(w, http.StatusOK, inspectOut)
// Only for the Compat API: we want to remove sessions that were
// stopped. This is very hacky, but should suffice for now.
if !utils.IsLibpodRequest(r) && inspectOut.CanRemove {
logrus.Infof("Pruning stale exec session %s from container %s", sessionID, sessionCtr.ID())
if err := sessionCtr.ExecRemove(sessionID, false); err != nil && errors.Cause(err) != define.ErrNoSuchExecSession {
logrus.Errorf("Error removing stale exec session %s from container %s: %v", sessionID, sessionCtr.ID(), err)
}
}
}
// ExecStartHandler runs a given exec session.
func ExecStartHandler(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value("runtime").(*libpod.Runtime)
sessionID := mux.Vars(r)["id"]
// TODO: We should read/support Tty and Detach from here.
bodyParams := new(handlers.ExecStartConfig)
if err := json.NewDecoder(r.Body).Decode(&bodyParams); err != nil {
utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
errors.Wrapf(err, "failed to decode parameters for %s", r.URL.String()))
return
}
if bodyParams.Detach {
utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
errors.Errorf("Detached exec is not yet supported"))
return
}
// TODO: Verify TTY setting against what inspect session was made with
sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
if err != nil {
utils.Error(w, fmt.Sprintf("No such exec session: %s", sessionID), http.StatusNotFound, err)
return
}
logrus.Debugf("Starting exec session %s of container %s", sessionID, sessionCtr.ID())
state, err := sessionCtr.State()
if err != nil {
utils.InternalServerError(w, err)
return
}
if state != define.ContainerStateRunning {
utils.Error(w, http.StatusText(http.StatusConflict), http.StatusConflict, errors.Errorf("cannot exec in a container that is not running; container %s is %s", sessionCtr.ID(), state.String()))
return
}
// Hijack the connection
hijacker, ok := w.(http.Hijacker)
if !ok {
utils.InternalServerError(w, errors.Errorf("unable to hijack connection"))
return
}
connection, buffer, err := hijacker.Hijack()
if err != nil {
utils.InternalServerError(w, errors.Wrapf(err, "error hijacking connection"))
return
}
fmt.Fprintf(connection, AttachHeader)
logrus.Debugf("Hijack for attach of container %s exec session %s successful", sessionCtr.ID(), sessionID)
if err := sessionCtr.ExecHTTPStartAndAttach(sessionID, connection, buffer, nil, nil, nil); err != nil {
logrus.Errorf("Error attaching to container %s exec session %s: %v", sessionCtr.ID(), sessionID, err)
}
logrus.Debugf("Attach for container %s exec session %s completed successfully", sessionCtr.ID(), sessionID)
}
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