basic function comparing uids of host/container

internal/app/wwctl/container/syncuser/root.go

@@ -0,0 +1,35 @@
+package syncuser
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/container"
+	"github.com/spf13/cobra"
+)
+
+var (
+	baseCmd = &cobra.Command{
+		DisableFlagsInUseLine: true,
+		Use:                   "syncuser [OPTIONS] CONTAINER",
+		Short:                 "Synchronizes user in container",
+		Long: `Synchronize the uids and gids from the host to the container.
+Users/groups which are only present in the container will be preserved if no
+uid/gid collision is detected. File ownerships are also changed.`,
+		RunE: CobraRunE,
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			if len(args) != 0 {
+				return nil, cobra.ShellCompDirectiveNoFileComp
+			}
+			list, _ := container.ListSources()
+			return list, cobra.ShellCompDirectiveNoFileComp
+		},
+
+		Args: cobra.MinimumNArgs(1),
+	}
+)
+
+func init() {
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}