devtool: fix devtool finish when gitmodules file is empty

When a .gitmodules file exists but is empty then devtool finish fails.
Add an additional check for this.

[YOCTO #14999]

Signed-off-by: Thomas Roos <throos@amazon.de>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b4f0f7c4934bade9e4d4a1086f9d8b29d8e9ad45)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index ed118afada4579b63d7f32970c6b7008cc4ccfbf..9c9451e5285645f389727180218951bac37bf802 100644 (file)
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -225,7 +225,7 @@ def srctree_hash_files(d, srcdir=None):
             env['GIT_INDEX_FILE'] = tmp_index.name
             subprocess.check_output(['git', 'add', '-A', '.'], cwd=s_dir, env=env)
             git_sha1 = subprocess.check_output(['git', 'write-tree'], cwd=s_dir, env=env).decode("utf-8")
-            if os.path.exists(os.path.join(s_dir, ".gitmodules")):
+            if os.path.exists(os.path.join(s_dir, ".gitmodules")) and os.path.getsize(os.path.join(s_dir, ".gitmodules")) > 0:
                 submodule_helper = subprocess.check_output(["git", "config", "--file", ".gitmodules", "--get-regexp", "path"], cwd=s_dir, env=env).decode("utf-8")
                 for line in submodule_helper.splitlines():
                     module_dir = os.path.join(s_dir, line.rsplit(maxsplit=1)[1])