Report explorer error better

Fixes #766

cdist/__init__.py

@@ -181,17 +181,40 @@ class CdistObjectError(CdistEntityError):
                          params, stdout_paths, stderr_paths, subject)
 
 
+class CdistObjectExplorerError(CdistEntityError):
+    """
+    Something went wrong while working on a specific
+    cdist object explorer
+    """
+    def __init__(self, cdist_object, explorer_name, explorer_path,
+                 stderr_path, subject=''):
+        params = [
+            ('object name', cdist_object.name, ),
+            ('object path', cdist_object.absolute_path, ),
+            ('object source', " ".join(cdist_object.source), ),
+            ('object type', os.path.realpath(
+                cdist_object.cdist_type.absolute_path), ),
+            ('explorer name', explorer_name, ),
+            ('explorer path', explorer_path, ),
+        ]
+        stdout_paths = []
+        stderr_paths = [
+            ('remote', stderr_path, ),
+        ]
+        super().__init__("explorer '{}' of object '{}'".format(
+            explorer_name, cdist_object.name), params, stdout_paths,
+            stderr_paths, subject)
+
+
 class InitialManifestError(CdistEntityError):
     """Something went wrong while executing initial manifest"""
     def __init__(self, initial_manifest, stdout_path, stderr_path, subject=''):
         params = [
             ('path', initial_manifest, ),
         ]
-        stdout_paths = []
         stdout_paths = [
             ('init', stdout_path, ),
         ]
-        stderr_paths = []
         stderr_paths = [
             ('init', stderr_path, ),
         ]
@@ -199,6 +222,20 @@ class InitialManifestError(CdistEntityError):
                          stderr_paths, subject)
 
 
+class GlobalExplorerError(CdistEntityError):
+    """Something went wrong while executing global explorer"""
+    def __init__(self, name, path, stderr_path, subject=''):
+        params = [
+            ('name', name, ),
+            ('path', path, ),
+        ]
+        stderr_paths = [
+            ('remote', stderr_path, ),
+        ]
+        super().__init__("global explorer '{}'".format(name),
+                         params, [], stderr_paths, subject)
+
+
 def file_to_list(filename):
     """Return list from \n seperated file"""
     if os.path.isfile(filename):

cdist/config.py

@@ -702,12 +702,11 @@ class Config(object):
 
     def object_prepare(self, cdist_object, transfer_type_explorers=True):
         """Prepare object: Run type explorer + manifest"""
+        self.log.verbose("Preparing object {}".format(cdist_object.name))
+        self.log.verbose(
+            "Running manifest and explorers for " + cdist_object.name)
+        self.explorer.run_type_explorers(cdist_object, transfer_type_explorers)
         try:
-            self.log.verbose("Preparing object {}".format(cdist_object.name))
-            self.log.verbose(
-                    "Running manifest and explorers for " + cdist_object.name)
-            self.explorer.run_type_explorers(cdist_object,
-                                             transfer_type_explorers)
             self.manifest.run_type_manifest(cdist_object)
             cdist_object.state = core.CdistObject.STATE_PREPARED
         except cdist.Error as e:

cdist/core/explorer.py

@@ -109,10 +109,17 @@ class Explorer(object):
             self._run_global_explorers_parallel(out_path)
 
     def _run_global_explorer(self, explorer, out_path):
-        output = self.run_global_explorer(explorer)
+        try:
-        path = os.path.join(out_path, explorer)
+            path = os.path.join(out_path, explorer)
-        with open(path, 'w') as fd:
+            output = self.run_global_explorer(explorer)
-            fd.write(output)
+            with open(path, 'w') as fd:
+                fd.write(output)
+        except cdist.Error as e:
+            local_path = os.path.join(self.local.global_explorer_path,
+                                      explorer)
+            stderr_path = os.path.join(self.local.stderr_base_path, "remote")
+            raise cdist.GlobalExplorerError(explorer, local_path, stderr_path,
+                                            e)
 
     def _run_global_explorers_seq(self, out_path):
         self.log.debug("Running global explorers sequentially")
@@ -186,11 +193,20 @@ class Explorer(object):
         self.log.trace("Transferring object parameters for object: %s",
                        cdist_object.name)
         self.transfer_object_parameters(cdist_object)
-        for explorer in self.list_type_explorer_names(cdist_object.cdist_type):
+        cdist_type = cdist_object.cdist_type
-            output = self.run_type_explorer(explorer, cdist_object)
+        for explorer in self.list_type_explorer_names(cdist_type):
             self.log.trace("Running type explorer '%s' for object '%s'",
                            explorer, cdist_object.name)
-            cdist_object.explorers[explorer] = output
+            try:
+                output = self.run_type_explorer(explorer, cdist_object)
+                cdist_object.explorers[explorer] = output
+            except cdist.Error as e:
+                path = os.path.join(self.local.type_path,
+                                    cdist_type.explorer_path,
+                                    explorer)
+                stderr_path = os.path.join(self.local.stderr_base_path, "remote")
+                raise cdist.CdistObjectExplorerError(
+                    cdist_object, explorer, path, stderr_path, e)
 
     def run_type_explorer(self, explorer, cdist_object):
         """Run the given type explorer for the given object and return