externalsrc: Handle .git not being a directory

Use git rev-parse to determine the location of the .git directory, in
case it is not an immediate child of EXTERNALSRC (e.g. when using
submodules). In the event git can't resolve the .git directory, fall
back to the non-git method for hashing.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index 9aabb426d9eb30cfe68f3c8380faf9a765da947c..8141f25e0419de83071cca31db4def7bf53c4b43 100644 (file)
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -184,11 +184,19 @@ def srctree_hash_files(d, srcdir=None):
     import tempfile
 
     s_dir = srcdir or d.getVar('EXTERNALSRC')
-    git_dir = os.path.join(s_dir, '.git')
-    oe_hash_file = os.path.join(git_dir, 'oe-devtool-tree-sha1')
+    git_dir = None
+
+    try:
+        # git rev-parse returns the path relative to the current working
+        # directory
+        git_dir = os.path.join(s_dir,
+            subprocess.check_output(['git', 'rev-parse', '--git-dir'], cwd=s_dir).decode("utf-8").rstrip())
+    except subprocess.CalledProcessError:
+        pass
 
     ret = " "
-    if os.path.exists(git_dir):
+    if git_dir is not None:
+        oe_hash_file = os.path.join(git_dir, 'oe-devtool-tree-sha1')
         with tempfile.NamedTemporaryFile(prefix='oe-devtool-index') as tmp_index:
             # Clone index
             shutil.copyfile(os.path.join(git_dir, 'index'), tmp_index.name)