podman volume exists

Add podman volume exists command with remote support.

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

8 files changed, 169 insertions, 0 deletions

diff --git a/pkg/api/handlers/libpod/volumes.go b/pkg/api/handlers/libpod/volumes.go
index 38fdf1b4d..1a8759c6c 100644
--- a/pkg/api/handlers/libpod/volumes.go
+++ b/pkg/api/handlers/libpod/volumes.go
@@ -11,6 +11,7 @@ import (
 	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/containers/podman/v2/pkg/domain/entities/reports"
 	"github.com/containers/podman/v2/pkg/domain/filters"
+	"github.com/containers/podman/v2/pkg/domain/infra/abi"
 	"github.com/containers/podman/v2/pkg/domain/infra/abi/parse"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
@@ -203,3 +204,21 @@ func RemoveVolume(w http.ResponseWriter, r *http.Request) {
 	}
 	utils.WriteResponse(w, http.StatusNoContent, "")
 }
+
+// ExistsVolume check if a volume exists
+func ExistsVolume(w http.ResponseWriter, r *http.Request) {
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+	name := utils.GetName(r)
+
+	ic := abi.ContainerEngine{Libpod: runtime}
+	report, err := ic.VolumeExists(r.Context(), name)
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
+		return
+	}
+	if !report.Value {
+		utils.Error(w, "volume not found", http.StatusNotFound, define.ErrNoSuchVolume)
+		return
+	}
+	utils.WriteResponse(w, http.StatusNoContent, "")
+}
diff --git a/pkg/api/server/register_volumes.go b/pkg/api/server/register_volumes.go
index aa0f67604..68727f2e1 100644
--- a/pkg/api/server/register_volumes.go
+++ b/pkg/api/server/register_volumes.go
@@ -28,6 +28,28 @@ func (s *APIServer) registerVolumeHandlers(r *mux.Router) error {
 	//   '500':
 	//      "$ref": "#/responses/InternalError"
 	r.Handle(VersionedPath("/libpod/volumes/create"), s.APIHandler(libpod.CreateVolume)).Methods(http.MethodPost)
+	// swagger:operation GET /libpod/volumes/{name}/exists libpod libpodExistsVolume
+	// ---
+	// tags:
+	//  - volumes
+	// summary: Volume exists
+	// description: Check if a volume exists
+	// parameters:
+	//  - in: path
+	//    name: name
+	//    type: string
+	//    required: true
+	//    description: the name of the volume
+	// produces:
+	// - application/json
+	// responses:
+	//   204:
+	//     description: volume exists
+	//   404:
+	//     $ref: '#/responses/NoSuchVolume'
+	//   500:
+	//     $ref: '#/responses/InternalError'
+	r.Handle(VersionedPath("/libpod/volumes/{name}/exists"), s.APIHandler(libpod.ExistsVolume)).Methods(http.MethodGet)
 	// swagger:operation GET /libpod/volumes/json libpod libpodListVolumes
 	// ---
 	// tags:
diff --git a/pkg/bindings/volumes/types.go b/pkg/bindings/volumes/types.go
index 379174e33..3fda77ddd 100644
--- a/pkg/bindings/volumes/types.go
+++ b/pkg/bindings/volumes/types.go
@@ -30,3 +30,9 @@ type RemoveOptions struct {
 	// Force removes the volume even if it is being used
 	Force *bool
 }
+
+//go:generate go run ../generator/generator.go ExistsOptions
+// ExistsOptions are optional options for checking
+// if a volume exists
+type ExistsOptions struct {
+}
diff --git a/pkg/bindings/volumes/types_exists_options.go b/pkg/bindings/volumes/types_exists_options.go
new file mode 100644
index 000000000..c66586a23
--- /dev/null
+++ b/pkg/bindings/volumes/types_exists_options.go
@@ -0,0 +1,88 @@
+package volumes
+
+import (
+	"net/url"
+	"reflect"
+	"strconv"
+	"strings"
+
+	jsoniter "github.com/json-iterator/go"
+	"github.com/pkg/errors"
+)
+
+/*
+This file is generated automatically by go generate.  Do not edit.
+*/
+
+// Changed
+func (o *ExistsOptions) Changed(fieldName string) bool {
+	r := reflect.ValueOf(o)
+	value := reflect.Indirect(r).FieldByName(fieldName)
+	return !value.IsNil()
+}
+
+// ToParams
+func (o *ExistsOptions) ToParams() (url.Values, error) {
+	params := url.Values{}
+	if o == nil {
+		return params, nil
+	}
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
+	s := reflect.ValueOf(o)
+	if reflect.Ptr == s.Kind() {
+		s = s.Elem()
+	}
+	sType := s.Type()
+	for i := 0; i < s.NumField(); i++ {
+		fieldName := sType.Field(i).Name
+		if !o.Changed(fieldName) {
+			continue
+		}
+		fieldName = strings.ToLower(fieldName)
+		f := s.Field(i)
+		if reflect.Ptr == f.Kind() {
+			f = f.Elem()
+		}
+		switch f.Kind() {
+		case reflect.Bool:
+			params.Set(fieldName, strconv.FormatBool(f.Bool()))
+		case reflect.String:
+			params.Set(fieldName, f.String())
+		case reflect.Int, reflect.Int64:
+			// f.Int() is always an int64
+			params.Set(fieldName, strconv.FormatInt(f.Int(), 10))
+		case reflect.Uint, reflect.Uint64:
+			// f.Uint() is always an uint64
+			params.Set(fieldName, strconv.FormatUint(f.Uint(), 10))
+		case reflect.Slice:
+			typ := reflect.TypeOf(f.Interface()).Elem()
+			switch typ.Kind() {
+			case reflect.String:
+				sl := f.Slice(0, f.Len())
+				s, ok := sl.Interface().([]string)
+				if !ok {
+					return nil, errors.New("failed to convert to string slice")
+				}
+				for _, val := range s {
+					params.Add(fieldName, val)
+				}
+			default:
+				return nil, errors.Errorf("unknown slice type %s", f.Kind().String())
+			}
+		case reflect.Map:
+			lowerCaseKeys := make(map[string][]string)
+			iter := f.MapRange()
+			for iter.Next() {
+				lowerCaseKeys[iter.Key().Interface().(string)] = iter.Value().Interface().([]string)
+
+			}
+			s, err := json.MarshalToString(lowerCaseKeys)
+			if err != nil {
+				return nil, err
+			}
+
+			params.Set(fieldName, s)
+		}
+	}
+	return params, nil
+}
diff --git a/pkg/bindings/volumes/volumes.go b/pkg/bindings/volumes/volumes.go
index fe081eb46..60fdd0a23 100644
--- a/pkg/bindings/volumes/volumes.go
+++ b/pkg/bindings/volumes/volumes.go
@@ -114,3 +114,16 @@ func Remove(ctx context.Context, nameOrID string, options *RemoveOptions) error
 	}
 	return response.Process(nil)
 }
+
+// Exists returns true if a given volume exists
+func Exists(ctx context.Context, nameOrID string, options *ExistsOptions) (bool, error) {
+	conn, err := bindings.GetClient(ctx)
+	if err != nil {
+		return false, err
+	}
+	response, err := conn.DoRequest(nil, http.MethodGet, "/volumes/%s/exists", nil, nil, nameOrID)
+	if err != nil {
+		return false, err
+	}
+	return response.IsSuccess(), nil
+}
diff --git a/pkg/domain/entities/engine_container.go b/pkg/domain/entities/engine_container.go
index 7b43ac961..39bda1d72 100644
--- a/pkg/domain/entities/engine_container.go
+++ b/pkg/domain/entities/engine_container.go
@@ -86,6 +86,7 @@ type ContainerEngine interface {
 	Unshare(ctx context.Context, args []string) error
 	Version(ctx context.Context) (*SystemVersionReport, error)
 	VolumeCreate(ctx context.Context, opts VolumeCreateOptions) (*IDOrNameResponse, error)
+	VolumeExists(ctx context.Context, namesOrId string) (*BoolReport, error)
 	VolumeInspect(ctx context.Context, namesOrIds []string, opts InspectOptions) ([]*VolumeInspectReport, []error, error)
 	VolumeList(ctx context.Context, opts VolumeListOptions) ([]*VolumeListReport, error)
 	VolumePrune(ctx context.Context, options VolumePruneOptions) ([]*reports.PruneReport, error)
diff --git a/pkg/domain/infra/abi/volumes.go b/pkg/domain/infra/abi/volumes.go
index 823605052..f15aa2d14 100644
--- a/pkg/domain/infra/abi/volumes.go
+++ b/pkg/domain/infra/abi/volumes.go
@@ -153,3 +153,12 @@ func (ic *ContainerEngine) VolumeList(ctx context.Context, opts entities.VolumeL
 	}
 	return reports, nil
 }
+
+// VolumeExists check if a given volume name exists
+func (ic *ContainerEngine) VolumeExists(ctx context.Context, nameOrID string) (*entities.BoolReport, error) {
+	exists, err := ic.Libpod.HasVolume(nameOrID)
+	if err != nil {
+		return nil, err
+	}
+	return &entities.BoolReport{Value: exists}, nil
+}
diff --git a/pkg/domain/infra/tunnel/volumes.go b/pkg/domain/infra/tunnel/volumes.go
index f21336828..ffd2c1d35 100644
--- a/pkg/domain/infra/tunnel/volumes.go
+++ b/pkg/domain/infra/tunnel/volumes.go
@@ -80,3 +80,14 @@ func (ic *ContainerEngine) VolumeList(ctx context.Context, opts entities.VolumeL
 	options := new(volumes.ListOptions).WithFilters(opts.Filter)
 	return volumes.List(ic.ClientCtx, options)
 }
+
+// VolumeExists checks if the given volume exists
+func (ic *ContainerEngine) VolumeExists(ctx context.Context, nameOrID string) (*entities.BoolReport, error) {
+	exists, err := volumes.Exists(ic.ClientCtx, nameOrID, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &entities.BoolReport{
+		Value: exists,
+	}, nil
+}