contrib/diffall: comment actual reason for 'cdup'

The comment from an earlier commit did not reflect the actual reason this
operation is needed.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/diffall/git-diffall b/contrib/diffall/git-diffall
index 9bbd27f4a5db3352dc97d50e011615650ac0e533..d706a6dee32839007f8fcfb32794b51a1e59765a 100755 (executable)
--- a/contrib/diffall/git-diffall
+++ b/contrib/diffall/git-diffall
@@ -36,7 +36,9 @@ fi
 
 start_dir=$(pwd)
 
-# needed to access tar utility
+# All the file paths returned by the diff command are relative to the root
+# of the working copy. So if the script is called from a subdirectory, it
+# must switch to the root of working copy before trying to use those paths.
 cdup=$(git rev-parse --show-cdup) &&
 cd "$cdup" || {
        echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"