vc-revert-buffer
vc-revert-buffer is an alias for `vc-revert' in `vc.el
'.
(vc-revert-buffer)
This function is obsolete since 23.1;
use `vc-revert' instead.
Revert working copies of the selected fileset to their repository contents.
This asks for confirmation if the buffer contents are not identical
to the working revision (except for keyword expansion).