buffer: introduce git_buf_attach_notowned

Provide a convenience function that creates a buffer that can be provided
to callers but will not be freed via `git_buf_free`, so the buffer
creator maintains the allocation lifecycle of the buffer's contents.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/attr.c b/src/attr.c
index 44593da81..38420807a 100644
--- a/src/attr.c
+++ b/src/attr.c
@@ -282,9 +282,8 @@ static int system_attr_file(
 	 * a consumer. This allows them to treat this as a regular `git_buf`,
 	 * but their call to `git_buf_free` will not attempt to free it.
 	 */
-	out->ptr = attr_session->sysdir.ptr;
-	out->size = attr_session->sysdir.size;
-	out->asize = 0;
+	git_buf_attach_notowned(
+		out, attr_session->sysdir.ptr, attr_session->sysdir.size);
 	return 0;
 }