Make !pattern in .gitattributes non-fatal

Before 82dce99 (attr: more matching optimizations from .gitignore,
2012-10-15), .gitattributes did not have any special treatment of a
leading '!'.  The docs, however, always said

  The rules how the pattern matches paths are the same as in
  `.gitignore` files; see linkgit:gitignore[5].

By those rules, leading '!' means pattern negation.  So 82dce99
correctly determined that this kind of line makes no sense and should
be disallowed.

However, users who actually had a rule for files starting with a '!'
are in a bad position: before 82dce99 '!' matched that literal
character, so it is conceivable that users have .gitattributes with
such lines in them.  After 82dce99 the unescaped version was
disallowed in such a way that git outright refuses to run(!) most
commands in the presence of such a .gitattributes.  It therefore
becomes very hard to fix, let alone work with, such repositories.

Let's at least allow the users to fix their repos: change the fatal
error into a warning.

Reported-by: mathstuf@gmail.com
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/attr.c b/attr.c
index 8985c5c25b365276259838c1a50945b7e600dc31..d181d98b0e12959bff2074720c77daea661429dd 100644 (file)
--- a/attr.c
+++ b/attr.c
@@ -255,9 +255,11 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
                                      &res->u.pat.patternlen,
                                      &res->u.pat.flags,
                                      &res->u.pat.nowildcardlen);
-               if (res->u.pat.flags & EXC_FLAG_NEGATIVE)
-                       die(_("Negative patterns are forbidden in git attributes\n"
-                             "Use '\\!' for literal leading exclamation."));
+               if (res->u.pat.flags & EXC_FLAG_NEGATIVE) {
+                       warning(_("Negative patterns are ignored in git attributes\n"
+                                 "Use '\\!' for literal leading exclamation."));
+                       return NULL;
+               }
        }
        res->is_macro = is_macro;
        res->num_attr = num_attr;

diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index 807b8b88e215df5ce39504b1858be8694499727d..1035a14b37203202a5476f65d07f9bc505bfb52c 100755 (executable)
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -198,7 +198,8 @@ test_expect_success 'root subdir attribute test' '
 
 test_expect_success 'negative patterns' '
        echo "!f test=bar" >.gitattributes &&
-       test_must_fail git check-attr test -- f
+       git check-attr test -- '"'"'!f'"'"' 2>errors &&
+       test_i18ngrep "Negative patterns are ignored" errors
 '
 
 test_expect_success 'patterns starting with exclamation' '