pre-commit hook: complain about conflict markers.

Several <<< or === or >>> characters at the beginning of a line
is very likely to be leftover conflict markers from a failed
automerge the user resolved incorrectly, so detect them.

As usual, this can be defeated with "git commit --no-verify" if
you really do want to have those files, just like changes that
introduce trailing whitespaces.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/templates/hooks--pre-commit b/templates/hooks--pre-commit
index 43d3b6e..723a9ef 100644 (file)
--- a/templates/hooks--pre-commit
+++ b/templates/hooks--pre-commit
@@ -61,6 +61,9 @@ perl -e '
            if (/^\s*   /) {
                bad_line("indent SP followed by a TAB", $_);
            }
+           if (/^(?:[<>=]){7}/) {
+               bad_line("unresolved merge conflict", $_);
+           }
        }
     }
     exit($found_bad);