config: pass down PullOptions from the storage configuration

maintain the PullOptions as read from the storage.conf file, so that
we don't lose options like `convert_images` that are necessary to
convert existing images to a format usable with composefs.

Do not bother to expose this configuration in the crio drop-in
configuration as the PullOptions API is still experimental in
containers/storage.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

pkg/config/config.go

@@ -153,6 +153,9 @@ type RootConfig struct {
 	// StorageOption is a list of storage driver specific options.
 	StorageOptions []string `toml:"storage_option"`
 
+	// PullOptions is a map of pull options that are passed to the storage driver.
+	pullOptions map[string]string
+
 	// LogDir is the default log directory where all logs will go unless kubelet
 	// tells us to put them somewhere else.
 	LogDir string `toml:"log_dir"`
@@ -186,6 +189,7 @@ func (c *RootConfig) GetStore() (storage.Store, error) {
 		ImageStore:         c.ImageStore,
 		GraphDriverName:    c.Storage,
 		GraphDriverOptions: c.StorageOptions,
+		PullOptions:        c.pullOptions,
 	})
 }
 
@@ -863,6 +867,7 @@ func DefaultConfig() (*Config, error) {
 			ImageStore:        storeOpts.ImageStore,
 			Storage:           storeOpts.GraphDriverName,
 			StorageOptions:    storeOpts.GraphDriverOptions,
+			pullOptions:       storeOpts.PullOptions,
 			LogDir:            "/var/log/crio/pods",
 			VersionFile:       CrioVersionPathTmp,
 			CleanShutdownFile: CrioCleanShutdownFile,
@@ -1059,6 +1064,7 @@ func (c *RootConfig) Validate(onExecution bool) error {
 		c.Root = store.GraphRoot()
 		c.Storage = store.GraphDriverName()
 		c.StorageOptions = store.GraphOptions()
+		c.pullOptions = store.PullOptions()
 	}
 
 	return nil