Remove the last traces of the "override_kernel_check" option

The logic that depended on override_kernel_check was changed to test for
the feature at runtime, so we don't need to be suggesting to people that
they need to set this option, or that the option is even a thing.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

docs/containers-storage.conf.5.md

@@ -52,11 +52,6 @@ The `storage.options` table supports the following options:
 **size**=""
   Maximum size of a container image.   This flag can be used to set quota on the size of container images. (default: 10GB)
 
-**override_kernel_check**=""
-  Tell storage drivers to ignore kernel version checks.  Some storage drivers assume that if a kernel is too
-  old, the driver is not supported.  But for kernels that have had the drivers backported, this flag
-  allows users to override the checks
-
 **mount_program**=""
   Specifies the path to a custom program to use instead for mounting the file system.
 

drivers/overlay/overlay.go

@@ -85,13 +85,12 @@ const (
 )
 
 type overlayOptions struct {
-	overrideKernelCheck bool
-	imageStores         []string
-	quota               quota.Quota
-	mountProgram        string
-	ostreeRepo          string
-	skipMountHome       bool
-	mountOptions        string
+	imageStores   []string
+	quota         quota.Quota
+	mountProgram  string
+	ostreeRepo    string
+	skipMountHome bool
+	mountOptions  string
 }
 
 // Driver contains information about the home directory and the list of active mounts that are created using this driver.
@@ -226,12 +225,6 @@ func parseOptions(options []string) (*overlayOptions, error) {
 		}
 		key = strings.ToLower(key)
 		switch key {
-		case ".override_kernel_check", "overlay.override_kernel_check", "overlay2.override_kernel_check":
-			logrus.Debugf("overlay: override_kernelcheck=%s", val)
-			o.overrideKernelCheck, err = strconv.ParseBool(val)
-			if err != nil {
-				return nil, err
-			}
 		case ".mountopt", "overlay.mountopt", "overlay2.mountopt":
 			o.mountOptions = val
 		case ".size", "overlay.size", "overlay2.size":

storage.conf

@@ -29,9 +29,6 @@ size = ""
 # directly.
 #mount_program = "/usr/bin/fuse-overlayfs"
 
-# OverrideKernelCheck tells the driver to ignore kernel checks based on kernel version
-override_kernel_check = "false"
-
 # mountopt specifies comma separated list of extra mount options
 mountopt = "nodev"
 

store.go

@@ -3064,9 +3064,6 @@ type OptionsConfig struct {
 	// Size
 	Size string `toml:"size"`
 
-	// OverrideKernelCheck
-	OverrideKernelCheck string `toml:"override_kernel_check"`
-
 	// RemapUIDs is a list of default UID mappings to use for layers.
 	RemapUIDs string `toml:"remap-uids"`
 	// RemapGIDs is a list of default GID mappings to use for layers.
@@ -3191,9 +3188,6 @@ func ReloadConfigurationFile(configFile string, storeOptions *StoreOptions) {
 	if config.Storage.Options.MountOpt != "" {
 		storeOptions.GraphDriverOptions = append(storeOptions.GraphDriverOptions, fmt.Sprintf("%s.mountopt=%s", config.Storage.Driver, config.Storage.Options.MountOpt))
 	}
-	if config.Storage.Options.OverrideKernelCheck != "" {
-		storeOptions.GraphDriverOptions = append(storeOptions.GraphDriverOptions, fmt.Sprintf("%s.override_kernel_check=%s", config.Storage.Driver, config.Storage.Options.OverrideKernelCheck))
-	}
 	if config.Storage.Options.RemapUser != "" && config.Storage.Options.RemapGroup == "" {
 		config.Storage.Options.RemapGroup = config.Storage.Options.RemapUser
 	}