Teach new attribute 'export-ignore' to git-archive

Paths marked with this attribute are not output to git-archive
output.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/archive.c b/archive.c
index 7a32c19d3..6502b76ef 100644
--- a/archive.c
+++ b/archive.c
@@ -82,3 +82,16 @@ void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
 	return buffer;
 }
 
+int is_archive_path_ignored(const char *path)
+{
+	static struct git_attr *attr_export_ignore;
+	struct git_attr_check check[1];
+
+	if (!attr_export_ignore)
+		attr_export_ignore = git_attr("export-ignore", 13);
+
+	check[0].attr = attr_export_ignore;
+	if (git_checkattr(path, ARRAY_SIZE(check), check))
+		return 0;
+	return ATTR_TRUE(check[0].value);
+}