Now "diff --check" can detect not just whitespace errors but also notices
leftover conflict marker lines, we can use it in the sample pre-commit
hook script.
These days the object layer knows about the empty tree object without
actually having one in the repository, so we can run the test even for the
initial commit.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We used to mark hooks we ship as samples by making them unexecutable, but
some filesystems cannot tell what is executable and what is not.
This makes it much more explicit. The hooks are suffixed with .sample
(but now are made executable), so enabling it is still one step operation
(instead of "chmod +x $hook", you would do "mv $hook.sample $hook") but
now they won't get accidentally enabled on systems without executable bit.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
