Implement APIv2 Exec Create and Inspect Endpoints

Start and Resize require further implementation work.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

3 files changed, 120 insertions, 8 deletions

diff --git a/pkg/api/handlers/compat/exec.go b/pkg/api/handlers/compat/exec.go
new file mode 100644
index 000000000..1fa50d23b
--- /dev/null
+++ b/pkg/api/handlers/compat/exec.go
@@ -0,0 +1,104 @@
+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"
+)
+
+// 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
+	}
+
+	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)
+}
diff --git a/pkg/api/handlers/types.go b/pkg/api/handlers/types.go
index c6b70251b..6fa776d0f 100644
--- a/pkg/api/handlers/types.go
+++ b/pkg/api/handlers/types.go
@@ -177,6 +177,14 @@ type ImageTreeResponse struct {
 	Layers []ImageLayer `json:"layers"`
 }
 
+type ExecCreateConfig struct {
+	docker.ExecConfig
+}
+
+type ExecCreateResponse struct {
+	docker.IDResponse
+}
+
 func EventToApiEvent(e *events.Event) *Event {
 	return &Event{dockerEvents.Message{
 		Type:   e.Type.String(),
diff --git a/pkg/api/server/register_exec.go b/pkg/api/server/register_exec.go
index d27d21a04..71fb50307 100644
--- a/pkg/api/server/register_exec.go
+++ b/pkg/api/server/register_exec.go
@@ -8,7 +8,7 @@ import (
 )
 
 func (s *APIServer) registerExecHandlers(r *mux.Router) error {
-	// swagger:operation POST /containers/{name}/create compat createExec
+	// swagger:operation POST /containers/{name}/exec compat createExec
 	// ---
 	// tags:
 	//   - exec (compat)
@@ -74,9 +74,9 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//	   description: container is paused
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/containers/{name}/create"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle(VersionedPath("/containers/{name}/exec"), s.APIHandler(compat.ExecCreateHandler)).Methods(http.MethodPost)
 	// Added non version path to URI to support docker non versioned paths
-	r.Handle("/containers/{name}/create", s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle("/containers/{name}/exec", s.APIHandler(compat.ExecCreateHandler)).Methods(http.MethodPost)
 	// swagger:operation POST /exec/{id}/start compat startExec
 	// ---
 	// tags:
@@ -169,15 +169,15 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//     $ref: "#/responses/NoSuchExecInstance"
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/exec/{id}/json"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodGet)
+	r.Handle(VersionedPath("/exec/{id}/json"), s.APIHandler(compat.ExecInspectHandler)).Methods(http.MethodGet)
 	// Added non version path to URI to support docker non versioned paths
-	r.Handle("/exec/{id}/json", s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodGet)
+	r.Handle("/exec/{id}/json", s.APIHandler(compat.ExecInspectHandler)).Methods(http.MethodGet)
 
 	/*
 		libpod api follows
 	*/
 
-	// swagger:operation POST /libpod/containers/{name}/create libpod libpodCreateExec
+	// swagger:operation POST /libpod/containers/{name}/exec libpod libpodCreateExec
 	// ---
 	// tags:
 	//   - exec
@@ -243,7 +243,7 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//	   description: container is paused
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/libpod/containers/{name}/create"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodPost)
+	r.Handle(VersionedPath("/libpod/containers/{name}/exec"), s.APIHandler(compat.ExecCreateHandler)).Methods(http.MethodPost)
 	// swagger:operation POST /libpod/exec/{id}/start libpod libpodStartExec
 	// ---
 	// tags:
@@ -332,6 +332,6 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
 	//     $ref: "#/responses/NoSuchExecInstance"
 	//   500:
 	//     $ref: "#/responses/InternalError"
-	r.Handle(VersionedPath("/libpod/exec/{id}/json"), s.APIHandler(compat.UnsupportedHandler)).Methods(http.MethodGet)
+	r.Handle(VersionedPath("/libpod/exec/{id}/json"), s.APIHandler(compat.ExecInspectHandler)).Methods(http.MethodGet)
 	return nil
 }