pre-commit hook

The pre-commit hooks as follows.

 10 # This is slightly modified from Andrew Morton's Perfect Patch.
 11 # Lines you introduce should not have trailing whitespace.
 12 # Also check for an indentation that has SP before a TAB.
 13 
 14 if git-rev-parse --verify HEAD 2>/dev/null
 15 then
 16   git-diff-index -p -M --cached HEAD --
 17 else
 18   # NEEDSWORK: we should produce a diff with an empty tree here
 19   # if we want to do the same verification for the initial import.
 20   :                                                                                                                        
 21 fi |
 22 perl -e '

Will it also include binary files and thus corrupt data? And "git-rev-parse" should already deprecated.