APIv2 add generate systemd endpoint

Add support for generating systemd units
via the api and podman-remote.

Change the GenerateSystemdReport type to return the
units as map[string]string with the unit name as key.

Add `--format` flag to `podman generate systemd`
to allow the output to be formatted as json.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

2 files changed, 107 insertions, 0 deletions

diff --git a/pkg/api/handlers/libpod/generate.go b/pkg/api/handlers/libpod/generate.go
index 966874a2b..33bb75391 100644
--- a/pkg/api/handlers/libpod/generate.go
+++ b/pkg/api/handlers/libpod/generate.go
@@ -7,10 +7,55 @@ import (
 	"github.com/containers/podman/v2/pkg/api/handlers/utils"
 	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/containers/podman/v2/pkg/domain/infra/abi"
+	"github.com/containers/podman/v2/pkg/util"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
 )
 
+func GenerateSystemd(w http.ResponseWriter, r *http.Request) {
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+	decoder := r.Context().Value("decoder").(*schema.Decoder)
+	query := struct {
+		Name            bool   `schema:"useName"`
+		New             bool   `schema:"new"`
+		RestartPolicy   string `schema:"restartPolicy"`
+		StopTimeout     uint   `schema:"stopTimeout"`
+		ContainerPrefix string `schema:"containerPrefix"`
+		PodPrefix       string `schema:"podPrefix"`
+		Separator       string `schema:"separator"`
+	}{
+		RestartPolicy:   "on-failure",
+		StopTimeout:     util.DefaultContainerConfig().Engine.StopTimeout,
+		ContainerPrefix: "container",
+		PodPrefix:       "pod",
+		Separator:       "-",
+	}
+
+	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
+		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
+			errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
+		return
+	}
+
+	containerEngine := abi.ContainerEngine{Libpod: runtime}
+	options := entities.GenerateSystemdOptions{
+		Name:            query.Name,
+		New:             query.New,
+		RestartPolicy:   query.RestartPolicy,
+		StopTimeout:     &query.StopTimeout,
+		ContainerPrefix: query.ContainerPrefix,
+		PodPrefix:       query.PodPrefix,
+		Separator:       query.Separator,
+	}
+	report, err := containerEngine.GenerateSystemd(r.Context(), utils.GetName(r), options)
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "error generating systemd units"))
+		return
+	}
+
+	utils.WriteResponse(w, http.StatusOK, report.Units)
+}
+
 func GenerateKube(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 	decoder := r.Context().Value("decoder").(*schema.Decoder)
diff --git a/pkg/api/server/register_generate.go b/pkg/api/server/register_generate.go
index 7db8ee387..60e5b03f7 100644
--- a/pkg/api/server/register_generate.go
+++ b/pkg/api/server/register_generate.go
@@ -8,6 +8,68 @@ import (
 )
 
 func (s *APIServer) registerGenerateHandlers(r *mux.Router) error {
+	// swagger:operation GET /libpod/generate/{name:.*}/systemd libpod libpodGenerateSystemd
+	// ---
+	// tags:
+	//  - containers
+	//  - pods
+	// summary: Generate Systemd Units
+	// description: Generate Systemd Units based on a pod or container.
+	// parameters:
+	//  - in: path
+	//    name: name:.*
+	//    type: string
+	//    required: true
+	//    description: Name or ID of the container or pod.
+	//  - in: query
+	//    name: useName
+	//    type: boolean
+	//    default: false
+	//    description: Use container/pod names instead of IDs.
+	//  - in: query
+	//    name: new
+	//    type: boolean
+	//    default: false
+	//    description: Create a new container instead of starting an existing one.
+	//  - in: query
+	//    name: time
+	//    type: integer
+	//    default: 10
+	//    description: Stop timeout override.
+	//  - in: query
+	//    name: restartPolicy
+	//    default: on-failure
+	//    type: string
+	//    enum: ["no", on-success, on-failure, on-abnormal, on-watchdog, on-abort, always]
+	//    description: Systemd restart-policy.
+	//  - in: query
+	//    name: containerPrefix
+	//    type: string
+	//    default: container
+	//    description: Systemd unit name prefix for containers.
+	//  - in: query
+	//    name: podPrefix
+	//    type: string
+	//    default: pod
+	//    description: Systemd unit name prefix for pods.
+	//  - in: query
+	//    name: separator
+	//    type: string
+	//    default: "-"
+	//    description: Systemd unit name separator between name/id and prefix.
+	// produces:
+	// - application/json
+	// responses:
+	//   200:
+	//     description: no error
+	//     schema:
+	//       type: object
+	//       additionalProperties:
+	//         type: string
+	//   500:
+	//     $ref: "#/responses/InternalError"
+	r.HandleFunc(VersionedPath("/libpod/generate/{name:.*}/systemd"), s.APIHandler(libpod.GenerateSystemd)).Methods(http.MethodGet)
+
 	// swagger:operation GET /libpod/generate/{name:.*}/kube libpod libpodGenerateKube
 	// ---
 	// tags: