cmd: initialize manifest command

Signed-off-by: ChengyuZhu6 <hudson@cyzhu.com>

Author: ChengyuZhu6

cmd/nerdctl/manifest/manifest.go

@@ -0,0 +1,39 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package manifest
+
+import (
+	"github.com/containerd/nerdctl/v2/cmd/nerdctl/helpers"
+	"github.com/spf13/cobra"
+)
+
+func Command() *cobra.Command {
+	cmd := &cobra.Command{
+		Annotations:   map[string]string{helpers.Category: helpers.Management},
+		Use:           "manifest",
+		Short:         "Manage image manifests and manifest lists.",
+		RunE:          helpers.UnknownSubcommandAction,
+		SilenceUsage:  true,
+		SilenceErrors: true,
+	}
+
+	cmd.AddCommand(
+		InspectCommand(),
+	)
+
+	return cmd
+}

cmd/nerdctl/manifest/manifest_inspect.go

@@ -0,0 +1,43 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package manifest
+
+import (
+	"github.com/containerd/nerdctl/v2/cmd/nerdctl/completion"
+	"github.com/spf13/cobra"
+)
+
+func InspectCommand() *cobra.Command {
+	var cmd = &cobra.Command{
+		Use:               "inspect [OPTIONS] [MANIFEST_LIST] MANIFEST",
+		Short:             "Display the contents of a manifest list or manifest",
+		Args:              cobra.MinimumNArgs(1),
+		RunE:              inspectAction,
+		ValidArgsFunction: inspectShellComplete,
+		SilenceUsage:      true,
+		SilenceErrors:     true,
+	}
+	return cmd
+}
+
+func inspectAction(cmd *cobra.Command, args []string) error {
+	return nil
+}
+
+func inspectShellComplete(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	return completion.ImageNames(cmd)
+}