AB#1903 Add grpc interface to push decryption keys

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

state/setup/interface.go

@@ -0,0 +1,45 @@
+package setup
+
+import (
+	"io/fs"
+	"os"
+	"syscall"
+)
+
+// Mounter is an interface for mount and unmount operations.
+type Mounter interface {
+	Mount(source string, target string, fstype string, flags uintptr, data string) error
+	Unmount(target string, flags int) error
+	MkdirAll(path string, perm fs.FileMode) error
+}
+
+// DeviceMapper is an interface for device mapping operations.
+type DeviceMapper interface {
+	DiskUUID() string
+	FormatDisk(passphrase string) error
+	MapDisk(target string, passphrase string) error
+}
+
+// KeyWaiter is an interface to request and wait for disk decryption keys.
+type KeyWaiter interface {
+	WaitForDecryptionKey(uuid, addr string) ([]byte, error)
+	ResetKey()
+}
+
+// DiskMounter uses the syscall package to mount disks.
+type DiskMounter struct{}
+
+// Mount performs a mount syscall.
+func (m DiskMounter) Mount(source string, target string, fstype string, flags uintptr, data string) error {
+	return syscall.Mount(source, target, fstype, flags, data)
+}
+
+// Unmount performs an unmount syscall.
+func (m DiskMounter) Unmount(target string, flags int) error {
+	return syscall.Unmount(target, flags)
+}
+
+// MkdirAll uses os.MkdirAll to create the directory.
+func (m DiskMounter) MkdirAll(path string, perm fs.FileMode) error {
+	return os.MkdirAll(path, perm)
+}