Sync with 1.8.1.5

Documentation/RelNotes/1.8.1.5.txt

@@ -8,6 +8,12 @@ Fixes since v1.8.1.4
    the command line where an option is expected, the option parser
    used just one byte of the unknown letter when reporting an error.
 
+ * In v1.8.1, the attribute parser was tightened too restrictive to
+   error out upon seeing an entry that begins with an ! (exclamation),
+   which may confuse users to expect a "negative match", which does
+   not exist.  This has been demoted to a warning; such an entry is
+   still ignored.
+
  * "git apply --summary" has been taught to make sure the similarity
    value shown in its output is sensible, even when the input had a
    bogus value.

Documentation/git.txt

@@ -43,9 +43,10 @@ unreleased) version of Git, that is available from 'master'
 branch of the `git.git` repository.
 Documentation for older releases are available here:
 
-* link:v1.8.1.4/git.html[documentation for release 1.8.1.4]
+* link:v1.8.1.5/git.html[documentation for release 1.8.1.5]
 
 * release notes for
+  link:RelNotes/1.8.1.5.txt[1.8.1.5],
   link:RelNotes/1.8.1.4.txt[1.8.1.4],
   link:RelNotes/1.8.1.3.txt[1.8.1.3],
   link:RelNotes/1.8.1.2.txt[1.8.1.2],

Documentation/githooks.txt

@@ -365,7 +365,7 @@ preceding SP is also omitted.  Currently, no commands pass any
 'extra-info'.
 
 The hook always runs after the automatic note copying (see
-"notes.rewrite.<command>" in linkgit:git-config.txt) has happened, and
+"notes.rewrite.<command>" in linkgit:git-config.txt[1]) has happened, and
 thus has access to these notes.
 
 The following command-specific comments apply:

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;

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' '