Report location (filename and line number) for inventory syntax errors

When AnsibleError is raised for a syntax error in an inventory file,
report filename and line number to help pinpointing the error.

lib/ansible/inventory/ini.py

@@ -36,6 +36,7 @@ class InventoryParser(object):
     def __init__(self, filename=C.DEFAULT_HOST_LIST):
 
         with open(filename) as fh:
+            self.filename = filename
             self.lines = fh.readlines()
             self.groups = {}
             self.hosts = {}
@@ -87,8 +88,8 @@ class InventoryParser(object):
         self.groups = dict(all=all, ungrouped=ungrouped)
         active_group_name = 'ungrouped'
 
-        for line in self.lines:
-            line = utils.before_comment(line).strip()
+        for lineno in range(len(self.lines)):
+            line = utils.before_comment(self.lines[lineno]).strip()
             if line.startswith("[") and line.endswith("]"):
                 active_group_name = line.replace("[","").replace("]","")
                 if ":vars" in line or ":children" in line:
@@ -142,7 +143,7 @@ class InventoryParser(object):
                             try:
                                 (k,v) = t.split("=", 1)
                             except ValueError, e:
-                                raise errors.AnsibleError("Invalid ini entry: %s - %s" % (t, str(e)))
+                                raise errors.AnsibleError("%s:%s: Invalid ini entry: %s - %s" % (self.filename, lineno + 1, t, str(e)))
                             host.set_variable(k, self._parse_value(v))
                     self.groups[active_group_name].add_host(host)
 
@@ -153,8 +154,8 @@ class InventoryParser(object):
     def _parse_group_children(self):
         group = None
 
-        for line in self.lines:
-            line = line.strip()
+        for lineno in range(len(self.lines)):
+            line = self.lines[lineno].strip()
             if line is None or line == '':
                 continue
             if line.startswith("[") and ":children]" in line:
@@ -169,7 +170,7 @@ class InventoryParser(object):
             elif group:
                 kid_group = self.groups.get(line, None)
                 if kid_group is None:
-                    raise errors.AnsibleError("child group is not defined: (%s)" % line)
+                    raise errors.AnsibleError("%s:%d: child group is not defined: (%s)" % (self.filename, lineno + 1, line))
                 else:
                     group.add_child_group(kid_group)
 
@@ -180,13 +181,13 @@ class InventoryParser(object):
 
     def _parse_group_variables(self):
         group = None
-        for line in self.lines:
-            line = line.strip()
+        for lineno in range(len(self.lines)):
+            line = self.lines[lineno].strip()
             if line.startswith("[") and ":vars]" in line:
                 line = line.replace("[","").replace(":vars]","")
                 group = self.groups.get(line, None)
                 if group is None:
-                    raise errors.AnsibleError("can't add vars to undefined group: %s" % line)
+                    raise errors.AnsibleError("%s:%d: can't add vars to undefined group: %s" % (self.filename, lineno + 1, line))
             elif line.startswith("#") or line.startswith(";"):
                 pass
             elif line.startswith("["):
@@ -195,7 +196,7 @@ class InventoryParser(object):
                 pass
             elif group:
                 if "=" not in line:
-                    raise errors.AnsibleError("variables assigned to group must be in key=value form")
+                    raise errors.AnsibleError("%s:%d: variables assigned to group must be in key=value form" % (self.filename, lineno + 1))
                 else:
                     (k, v) = [e.strip() for e in line.split("=", 1)]
                     group.set_variable(k, self._parse_value(v))