ext4: Initial work for fscrypt-ext4

1 files changed, 36 insertions, 0 deletions

diff --git a/ext4/feature_flag.go b/ext4/feature_flag.go
new file mode 100644
index 0000000..4c64e0a
--- /dev/null
+++ b/ext4/feature_flag.go
@@ -0,0 +1,36 @@
+package main
+
+/*
+#cgo LDFLAGS: -lext2fs
+#include <ext2fs/ext2_fs.h>
+#include <ext2fs/ext2fs.h>
+
+#include <stdlib.h>
+*/
+import "C"
+import (
+	"fmt"
+	"unsafe"
+)
+
+// isExt4EncryptionEnabled returns true if the provided ext4 filesystem (as a
+// path to a device or mountpoint) has the encrypt feature flag enabled.
+func isExt4EncryptionEnabled(path string) bool {
+	cPath := C.CString(path)
+	defer C.free(unsafe.Pointer(cPath))
+
+	var fs C.ext2_filsys
+	ret := C.ext2fs_open(cPath, 0, 0, 0, C.unix_io_manager, &fs)
+	if ret != 0 {
+		panic(fmt.Errorf("Got error code %v when opening %s", ret, path))
+	}
+
+	hasEncryption := C.ext2fs_has_feature_encrypt(fs.super)
+	return hasEncryption != 0
+}
+
+// enableExt4Encryption enables encryption on the filesystem at the specified
+// path.
+
+// disableExt4Encryption disables encryption on the filesystem at the specified
+// path. Note that this operation is not supported and can cause data loss.