gitfs: Fix use of deprecated pygit2 function

0.27.4 (released 5 days ago) removed pygit2.Reference.get_object()

salt/utils/gitfs.py

@@ -1410,6 +1410,19 @@ def __init__(self, opts, remote, per_remote_defaults, per_remote_only,
             override_params, cache_root, role
         )
 
+    def peel(self, obj):
+        '''
+        Compatibility function for pygit2.Reference objects. Older versions of
+        pygit2 use .get_object() to return the object to which the reference
+        points, while newer versions use .peel(). In pygit2 0.27.4,
+        .get_object() was removed. This function will try .peel() first and
+        fall back to .get_object().
+        '''
+        try:
+            return obj.peel()
+        except AttributeError:
+            return obj.get_object()
+
     def checkout(self):
         '''
         Checkout the configured branch/tag
@@ -1428,7 +1441,7 @@ def checkout(self):
             return None
 
         try:
-            head_sha = local_head.get_object().hex
+            head_sha = self.peel(local_head).hex
         except AttributeError:
             # Shouldn't happen, but just in case a future pygit2 API change
             # breaks things, avoid a traceback and log an error.
@@ -1477,15 +1490,15 @@ def _perform_checkout(checkout_ref, branch=True):
         try:
             if remote_ref in refs:
                 # Get commit id for the remote ref
-                oid = self.repo.lookup_reference(remote_ref).get_object().id
+                oid = self.peel(self.repo.lookup_reference(remote_ref)).id
                 if local_ref not in refs:
                     # No local branch for this remote, so create one and point
                     # it at the commit id of the remote ref
                     self.repo.create_reference(local_ref, oid)
 
                 try:
                     target_sha = \
-                        self.repo.lookup_reference(remote_ref).get_object().hex
+                        self.peel(self.repo.lookup_reference(remote_ref)).hex
                 except KeyError:
                     log.error(
                         'pygit2 was unable to get SHA for %s in %s remote '
@@ -1857,8 +1870,8 @@ def get_tree_from_branch(self, ref):
         refs/remotes/origin/
         '''
         try:
-            return self.repo.lookup_reference(
-                'refs/remotes/origin/{0}'.format(ref)).get_object().tree
+            return self.peel(self.repo.lookup_reference(
+                'refs/remotes/origin/{0}'.format(ref))).tree
         except KeyError:
             return None
 
@@ -1867,8 +1880,8 @@ def get_tree_from_tag(self, ref):
         Return a pygit2.Tree object matching a tag ref fetched into refs/tags/
         '''
         try:
-            return self.repo.lookup_reference(
-                'refs/tags/{0}'.format(ref)).get_object().tree
+            return self.peel(self.repo.lookup_reference(
+                'refs/tags/{0}'.format(ref))).tree
         except KeyError:
             return None