Completely re-vamped restore command. Fixes #12403

The byteback-restore command now uses the rsync xattrs to display
information about the files due to be restored.  It can handle filenames
with spaces (!) and other characters.

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/ffi-xattr/linux_lib.rb b/lib/ffi-xattr/linux_lib.rb
new file mode 100644
index 0000000..e90a8ad
--- /dev/null
+++ b/lib/ffi-xattr/linux_lib.rb
@@ -0,0 +1,52 @@
+class Xattr # :nodoc: all
+  module Lib
+    extend FFI::Library
+
+    ffi_lib "c"
+
+    attach_function :strerror, [:int], :string
+
+    attach_function :listxattr,   [:string, :pointer, :size_t], :size_t
+    attach_function :setxattr,    [:string, :string, :pointer, :size_t, :int], :int
+    attach_function :getxattr,    [:string, :string, :pointer, :size_t], :int
+    attach_function :removexattr, [:string, :string], :int
+
+    attach_function :llistxattr,   [:string, :pointer, :size_t], :size_t
+    attach_function :lsetxattr,    [:string, :string, :pointer, :size_t, :int], :int
+    attach_function :lgetxattr,    [:string, :string, :pointer, :size_t], :int
+    attach_function :lremovexattr, [:string, :string], :int
+
+    class << self
+      def list(path, no_follow)
+        method = no_follow ? :llistxattr : :listxattr
+        size = send(method, path, nil, 0)
+        res_ptr = FFI::MemoryPointer.new(:pointer, size)
+        send(method, path, res_ptr, size)
+
+        res_ptr.read_string(size).split("\000")
+      end
+
+      def get(path, no_follow, key)
+        method = no_follow ? :lgetxattr : :getxattr
+        size = send(method, path, key, nil, 0)
+        return unless size > 0
+
+        str_ptr = FFI::MemoryPointer.new(:char, size)
+        send(method, path, key, str_ptr, size)
+
+        str_ptr.read_string(size)
+      end
+
+      def set(path, no_follow, key, value)
+        method = no_follow ? :lsetxattr : :setxattr
+        Error.check send(method, path, key, value, value.bytesize, 0)
+      end
+
+      def remove(path, no_follow, key)
+        method = no_follow ? :lremovexattr : :removexattr
+        Error.check send(method, path, key)
+      end
+    end
+
+  end
+end