Merge pull request #46597 from dixudx/implement_proposal_34058

Automatic merge from submit-queue (batch tested with PRs 51113, 46597, 50397, 51052, 51166)

implement proposal 34058: hostPath volume type

**What this PR does / why we need it**:
implement proposal #34058

**Which issue this PR fixes** : fixes #46549

**Special notes for your reviewer**:
cc @thockin @luxas @euank PTAL

pkg/api/types.go

@@ -597,10 +597,36 @@ const (
 	ClaimLost PersistentVolumeClaimPhase = "Lost"
 )
 
+type HostPathType string
+
+const (
+	// For backwards compatible, leave it empty if unset
+	HostPathUnset HostPathType = ""
+	// If nothing exists at the given path, an empty directory will be created there
+	// as needed with file mode 0755, having the same group and ownership with Kubelet.
+	HostPathDirectoryOrCreate HostPathType = "DirectoryOrCreate"
+	// A directory must exist at the given path
+	HostPathDirectory HostPathType = "Directory"
+	// If nothing exists at the given path, an empty file will be created there
+	// as needed with file mode 0644, having the same group and ownership with Kubelet.
+	HostPathFileOrCreate HostPathType = "FileOrCreate"
+	// A file must exist at the given path
+	HostPathFile HostPathType = "File"
+	// A UNIX socket must exist at the given path
+	HostPathSocket HostPathType = "Socket"
+	// A character device must exist at the given path
+	HostPathCharDev HostPathType = "CharDevice"
+	// A block device must exist at the given path
+	HostPathBlockDev HostPathType = "BlockDevice"
+)
+
 // Represents a host path mapped into a pod.
 // Host path volumes do not support ownership management or SELinux relabeling.
 type HostPathVolumeSource struct {
+	// If the path is a symlink, it will follow the link to the real path.
 	Path string
+	// Defaults to ""
+	Type *HostPathType
 }
 
 // Represents an empty directory for a pod.