Sync with v2.2.1

* maint:
  Git 2.2.1
  Git 2.1.4
  Git 2.0.5
  Git 1.9.5
  Git 1.8.5.6
  fsck: complain about NTFS ".git" aliases in trees
  read-cache: optionally disallow NTFS .git variants
  path: add is_ntfs_dotgit() helper
  fsck: complain about HFS+ ".git" aliases in trees
  read-cache: optionally disallow HFS+ .git variants
  utf8: add is_hfs_dotgit() helper
  fsck: notice .git case-insensitively
  t1450: refactor ".", "..", and ".git" fsck tests
  verify_dotfile(): reject .git case-insensitively
  read-tree: add tests for confusing paths like ".." and ".git"
  unpack-trees: propagate errors adding entries to the index

1 files changed, 33 insertions, 0 deletions

diff --git a/path.c b/path.c
index f68df0cf88..e608993801 100644
--- a/path.c
+++ b/path.c
@@ -823,3 +823,36 @@ int daemon_avoid_alias(const char *p)
 		}
 	}
 }
+
+static int only_spaces_and_periods(const char *path, size_t len, size_t skip)
+{
+	if (len < skip)
+		return 0;
+	len -= skip;
+	path += skip;
+	while (len-- > 0) {
+		char c = *(path++);
+		if (c != ' ' && c != '.')
+			return 0;
+	}
+	return 1;
+}
+
+int is_ntfs_dotgit(const char *name)
+{
+	int len;
+
+	for (len = 0; ; len++)
+		if (!name[len] || name[len] == '\\' || is_dir_sep(name[len])) {
+			if (only_spaces_and_periods(name, len, 4) &&
+					!strncasecmp(name, ".git", 4))
+				return 1;
+			if (only_spaces_and_periods(name, len, 5) &&
+					!strncasecmp(name, "git~1", 5))
+				return 1;
+			if (name[len] != '\\')
+				return 0;
+			name += len + 1;
+			len = -1;
+		}
+}