podman manifest exists

Add podman manifest exists command with remote support.

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

14 files changed, 276 insertions, 0 deletions

diff --git a/cmd/podman/manifest/exists.go b/cmd/podman/manifest/exists.go
new file mode 100644
index 000000000..14e01edab
--- /dev/null
+++ b/cmd/podman/manifest/exists.go
@@ -0,0 +1,39 @@
+package manifest
+
+import (
+	"github.com/containers/podman/v2/cmd/podman/common"
+	"github.com/containers/podman/v2/cmd/podman/registry"
+	"github.com/containers/podman/v2/pkg/domain/entities"
+	"github.com/spf13/cobra"
+)
+
+var (
+	existsCmd = &cobra.Command{
+		Use:               "exists MANIFEST",
+		Short:             "Check if a manifest list exists in local storage",
+		Long:              `If the manifest list exists in local storage, podman manifest exists exits with 0, otherwise the exit code will be 1.`,
+		Args:              cobra.ExactArgs(1),
+		RunE:              exists,
+		ValidArgsFunction: common.AutocompleteImages,
+		Example:           "podman manifest exists mylist",
+	}
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: existsCmd,
+		Parent:  manifestCmd,
+	})
+}
+
+func exists(cmd *cobra.Command, args []string) error {
+	found, err := registry.ImageEngine().ManifestExists(registry.GetContext(), args[0])
+	if err != nil {
+		return err
+	}
+	if !found.Value {
+		registry.SetExitCode(1)
+	}
+	return nil
+}
diff --git a/docs/source/manifest.rst b/docs/source/manifest.rst
index c63c28502..b35deaad7 100644
--- a/docs/source/manifest.rst
+++ b/docs/source/manifest.rst
@@ -7,6 +7,8 @@ Create and manipulate manifest lists and image indexes
 
 :doc:`create <markdown/podman-manifest-create.1>` Create a manifest list or image index
 
+:doc:`exists <markdown/podman-manifest-exists.1>` Check if the given manifest list exists in local storage
+
 :doc:`inspect <markdown/podman-manifest-inspect.1>` Display a manifest list or image index
 
 :doc:`push <markdown/podman-manifest-push.1>` Push a manifest list or image index to a registry
diff --git a/docs/source/markdown/podman-manifest-exists.1.md b/docs/source/markdown/podman-manifest-exists.1.md
new file mode 100644
index 000000000..e15110126
--- /dev/null
+++ b/docs/source/markdown/podman-manifest-exists.1.md
@@ -0,0 +1,43 @@
+% podman-manifest-exists(1)
+
+## NAME
+podman\-manifest\-exists - Check if the given manifest list exists in local storage
+
+## SYNOPSIS
+**podman manifest exists** *manifest*
+
+## DESCRIPTION
+**podman manifest exists** checks if a manifest list exists on local storage. Podman will
+return an exit code of `0` when the manifest is found. A `1` will be returned otherwise.
+An exit code of `125` indicates there was another issue.
+
+
+## OPTIONS
+
+#### **--help**, **-h**
+
+Print usage statement.
+
+## EXAMPLE
+
+Check if a manifest list called `list1` exists (the manifest list does actually exist).
+```
+$ podman manifest exists list1
+$ echo $?
+0
+$
+```
+
+Check if an manifest called `mylist` exists (the manifest list does not actually exist).
+```
+$ podman manifest exists mylist
+$ echo $?
+1
+$
+```
+
+## SEE ALSO
+podman(1), podman-manifest-create(1), podman-manifest-remove(1)
+
+## HISTORY
+January 2021, Originally compiled by Paul Holzinger `<paul.holzinger@web.de>`
diff --git a/docs/source/markdown/podman-manifest.1.md b/docs/source/markdown/podman-manifest.1.md
index 3353979ac..30ccdc56a 100644
--- a/docs/source/markdown/podman-manifest.1.md
+++ b/docs/source/markdown/podman-manifest.1.md
@@ -18,6 +18,7 @@ The `podman manifest` command provides subcommands which can be used to:
 | add      | [podman-manifest-add(1)](podman-manifest-add.1.md)           | Add an image to a manifest list or image index.                             |
 | annotate | [podman-manifest-annotate(1)](podman-manifest-annotate.1.md) | Add or update information about an entry in a manifest list or image index. |
 | create   | [podman-manifest-create(1)](podman-manifest-create.1.md)     | Create a manifest list or image index.                                      |
+| exists   | [podman-manifest-exists(1)](podman-manifest-exists.1.md)     | Check if the given manifest list exists in local storage                    |
 | inspect  | [podman-manifest-inspect(1)](podman-manifest-inspect.1.md)   | Display a manifest list or image index.                                     |
 | push     | [podman-manifest-push(1)](podman-manifest-push.1.md)         | Push a manifest list or image index to a registry.                          |
 | remove   | [podman-manifest-remove(1)](podman-manifest-remove.1.md)     | Remove an image from a manifest list or image index.                        |
diff --git a/libpod/image/manifests.go b/libpod/image/manifests.go
index 14f7c2f83..1ae3693c9 100644
--- a/libpod/image/manifests.go
+++ b/libpod/image/manifests.go
@@ -46,6 +46,15 @@ func (i *Image) InspectManifest() (*manifest.Schema2List, error) {
 	return list.Docker(), nil
 }
 
+// ExistsManifest checks if a manifest list exists
+func (i *Image) ExistsManifest() (bool, error) {
+	_, err := i.getManifestList()
+	if err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
 // RemoveManifest removes the given digest from the manifest list.
 func (i *Image) RemoveManifest(d digest.Digest) (string, error) {
 	list, err := i.getManifestList()
diff --git a/pkg/api/handlers/libpod/manifests.go b/pkg/api/handlers/libpod/manifests.go
index dce861f6f..35221ecf1 100644
--- a/pkg/api/handlers/libpod/manifests.go
+++ b/pkg/api/handlers/libpod/manifests.go
@@ -48,6 +48,24 @@ func ManifestCreate(w http.ResponseWriter, r *http.Request) {
 	utils.WriteResponse(w, http.StatusOK, handlers.IDResponse{ID: manID})
 }
 
+// ExistsManifest check if a manifest list exists
+func ExistsManifest(w http.ResponseWriter, r *http.Request) {
+	runtime := r.Context().Value("runtime").(*libpod.Runtime)
+	name := utils.GetName(r)
+
+	ic := abi.ImageEngine{Libpod: runtime}
+	report, err := ic.ManifestExists(r.Context(), name)
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
+		return
+	}
+	if !report.Value {
+		utils.Error(w, "manifest not found", http.StatusNotFound, errors.New("manifest not found"))
+		return
+	}
+	utils.WriteResponse(w, http.StatusNoContent, "")
+}
+
 func ManifestInspect(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 	name := utils.GetName(r)
diff --git a/pkg/api/server/register_manifest.go b/pkg/api/server/register_manifest.go
index 5e7d94538..eefcc396e 100644
--- a/pkg/api/server/register_manifest.go
+++ b/pkg/api/server/register_manifest.go
@@ -38,6 +38,26 @@ func (s *APIServer) registerManifestHandlers(r *mux.Router) error {
 	//   500:
 	//     $ref: "#/responses/InternalError"
 	r.Handle(VersionedPath("/libpod/manifests/create"), s.APIHandler(libpod.ManifestCreate)).Methods(http.MethodPost)
+	// swagger:operation GET /libpod/manifests/{name}/exists manifests Exists
+	// ---
+	// summary: Exists
+	// description: Check if manifest list exists
+	// parameters:
+	//  - in: path
+	//    name: name
+	//    type: string
+	//    required: true
+	//    description: the name of the manifest list
+	// produces:
+	// - application/json
+	// responses:
+	//   204:
+	//     description: manifest list exists
+	//   404:
+	//     $ref: '#/responses/NoSuchManifest'
+	//   500:
+	//     $ref: '#/responses/InternalError'
+	r.Handle(VersionedPath("/libpod/manifests/{name}/exists"), s.APIHandler(libpod.ExistsManifest)).Methods(http.MethodGet)
 	// swagger:operation GET /libpod/manifests/{name:.*}/json manifests Inspect
 	// ---
 	// summary: Inspect
diff --git a/pkg/bindings/manifests/manifests.go b/pkg/bindings/manifests/manifests.go
index b6db64b02..fec9832a0 100644
--- a/pkg/bindings/manifests/manifests.go
+++ b/pkg/bindings/manifests/manifests.go
@@ -49,6 +49,19 @@ func Create(ctx context.Context, names, images []string, options *CreateOptions)
 	return idr.ID, response.Process(&idr)
 }
 
+// Exists returns true if a given maifest list exists
+func Exists(ctx context.Context, name string, options *ExistsOptions) (bool, error) {
+	conn, err := bindings.GetClient(ctx)
+	if err != nil {
+		return false, err
+	}
+	response, err := conn.DoRequest(nil, http.MethodGet, "/manifests/%s/exists", nil, nil, name)
+	if err != nil {
+		return false, err
+	}
+	return response.IsSuccess(), nil
+}
+
 // Inspect returns a manifest list for a given name.
 func Inspect(ctx context.Context, name string, options *InspectOptions) (*manifest.Schema2List, error) {
 	var list manifest.Schema2List
diff --git a/pkg/bindings/manifests/types.go b/pkg/bindings/manifests/types.go
index 7f84d69fc..fde90a865 100644
--- a/pkg/bindings/manifests/types.go
+++ b/pkg/bindings/manifests/types.go
@@ -11,6 +11,12 @@ type CreateOptions struct {
 	All *bool
 }
 
+//go:generate go run ../generator/generator.go ExistsOptions
+// ExistsOptions are optional options for checking
+// if a manifest list exists
+type ExistsOptions struct {
+}
+
 //go:generate go run ../generator/generator.go AddOptions
 // AddOptions are optional options for adding manifests
 type AddOptions struct {
diff --git a/pkg/bindings/manifests/types_exists_options.go b/pkg/bindings/manifests/types_exists_options.go
new file mode 100644
index 000000000..fd2cd3ee9
--- /dev/null
+++ b/pkg/bindings/manifests/types_exists_options.go
@@ -0,0 +1,88 @@
+package manifests
+
+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/domain/entities/engine_image.go b/pkg/domain/entities/engine_image.go
index 935ee6f20..ee611502f 100644
--- a/pkg/domain/entities/engine_image.go
+++ b/pkg/domain/entities/engine_image.go
@@ -32,6 +32,7 @@ type ImageEngine interface {
 	Unmount(ctx context.Context, images []string, options ImageUnmountOptions) ([]*ImageUnmountReport, error)
 	Untag(ctx context.Context, nameOrID string, tags []string, options ImageUntagOptions) error
 	ManifestCreate(ctx context.Context, names, images []string, opts ManifestCreateOptions) (string, error)
+	ManifestExists(ctx context.Context, name string) (*BoolReport, error)
 	ManifestInspect(ctx context.Context, name string) ([]byte, error)
 	ManifestAdd(ctx context.Context, opts ManifestAddOptions) (string, error)
 	ManifestAnnotate(ctx context.Context, names []string, opts ManifestAnnotateOptions) (string, error)
diff --git a/pkg/domain/infra/abi/manifest.go b/pkg/domain/infra/abi/manifest.go
index 139032ad6..626f1f7bf 100644
--- a/pkg/domain/infra/abi/manifest.go
+++ b/pkg/domain/infra/abi/manifest.go
@@ -40,6 +40,18 @@ func (ir *ImageEngine) ManifestCreate(ctx context.Context, names, images []strin
 	return imageID, err
 }
 
+// ManifestExists checks if a manifest list with the given name exists in local storage
+func (ir *ImageEngine) ManifestExists(ctx context.Context, name string) (*entities.BoolReport, error) {
+	if image, err := ir.Libpod.ImageRuntime().NewFromLocal(name); err == nil {
+		exists, err := image.ExistsManifest()
+		if err != nil && errors.Cause(err) != buildahManifests.ErrManifestTypeNotSupported {
+			return nil, err
+		}
+		return &entities.BoolReport{Value: exists}, nil
+	}
+	return &entities.BoolReport{Value: false}, nil
+}
+
 // ManifestInspect returns the content of a manifest list or image
 func (ir *ImageEngine) ManifestInspect(ctx context.Context, name string) ([]byte, error) {
 	if newImage, err := ir.Libpod.ImageRuntime().NewFromLocal(name); err == nil {
diff --git a/pkg/domain/infra/tunnel/manifest.go b/pkg/domain/infra/tunnel/manifest.go
index 22ca44165..c12ba0045 100644
--- a/pkg/domain/infra/tunnel/manifest.go
+++ b/pkg/domain/infra/tunnel/manifest.go
@@ -23,6 +23,15 @@ func (ir *ImageEngine) ManifestCreate(ctx context.Context, names, images []strin
 	return imageID, err
 }
 
+// ManifestExists checks if a manifest list with the given name exists
+func (ir *ImageEngine) ManifestExists(ctx context.Context, name string) (*entities.BoolReport, error) {
+	exists, err := manifests.Exists(ir.ClientCtx, name, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &entities.BoolReport{Value: exists}, nil
+}
+
 // ManifestInspect returns contents of manifest list with given name
 func (ir *ImageEngine) ManifestInspect(ctx context.Context, name string) ([]byte, error) {
 	list, err := manifests.Inspect(ir.ClientCtx, name, nil)
diff --git a/test/e2e/manifest_test.go b/test/e2e/manifest_test.go
index 3e13057d3..e6ac83aea 100644
--- a/test/e2e/manifest_test.go
+++ b/test/e2e/manifest_test.go
@@ -251,4 +251,19 @@ var _ = Describe("Podman manifest", func() {
 		session.WaitWithDefaultTimeout()
 		Expect(session.ExitCode()).To(Not(Equal(0)))
 	})
+
+	It("podman manifest exists", func() {
+		manifestList := "manifest-list"
+		session := podmanTest.Podman([]string{"manifest", "create", manifestList})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+
+		session = podmanTest.Podman([]string{"manifest", "exists", manifestList})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		session = podmanTest.Podman([]string{"manifest", "exists", "no-manifest"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(1))
+	})
 })