[OE-core][dunfell 03/19] externalsrc: Detect code changes in submodules

["Steve Sakoman" <steve@sakoman.com>]

From: Douglas Royds <douglas.royds@taitradio.com>

Further to 50ff9afb39, only detect code changes in submodules that are
subdirectories of the EXTERNALSRC directory.

The (undocumented) git submodule--helper returns a path
for each submodule relative to the top of the repo.
Don't add submodules that are not within our source subtree.

[YOCTO #14333]

Signed-off-by: Douglas Royds <douglas.royds@taitradio.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 1c18225d3ef94a41fc073ae87c163b68e6d46571)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
---
 meta/classes/externalsrc.bbclass | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index 1d7300d65b..c7fcdca6ef 100644
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -219,11 +219,12 @@ def srctree_hash_files(d, srcdir=None):
             submodule_helper = subprocess.check_output(['git', 'submodule--helper', 'list'], 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])
-                proc = subprocess.Popen(['git', 'add', '-A', '.'], cwd=module_dir, env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
-                proc.communicate()
-                proc = subprocess.Popen(['git', 'write-tree'], cwd=module_dir, env=env, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
-                stdout, _ = proc.communicate()
-                git_sha1 += stdout.decode("utf-8")
+                if os.path.isdir(module_dir):
+                    proc = subprocess.Popen(['git', 'add', '-A', '.'], cwd=module_dir, env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                    proc.communicate()
+                    proc = subprocess.Popen(['git', 'write-tree'], cwd=module_dir, env=env, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
+                    stdout, _ = proc.communicate()
+                    git_sha1 += stdout.decode("utf-8")
             sha1 = hashlib.sha1(git_sha1.encode("utf-8")).hexdigest()
         with open(oe_hash_file, 'w') as fobj:
             fobj.write(sha1)
-- 
2.25.1