Update `xntcall` to change working directory

I can't make any assumptions about what sub code is called, therefore it is
safer (and easy enough) to have xnt change the working directory before
invoking the sub build

2 files changed, 6 insertions, 2 deletions

diff --git a/xnt/commands/target.py b/xnt/commands/target.py
index ca6f7fe..0520c74 100644
--- a/xnt/commands/target.py
+++ b/xnt/commands/target.py
@@ -62,7 +62,7 @@ class TargetCommand(Command):
             except AttributeError:
                 return None
         try:
-            if len(props) > 0:
+            if props and len(props) > 0:
                 setattr(self.build,
                         "properties",
                         process_params(props, __get_properties()))
diff --git a/xnt/tasks.py b/xnt/tasks.py
index a647b0b..1fdc0da 100644
--- a/xnt/tasks.py
+++ b/xnt/tasks.py
@@ -129,8 +129,12 @@ def xntcall(path, targets=None, props=None):
     """
     import xnt.xenant
     from xnt.commands.target import TargetCommand
+    cwd = os.getcwd()
     command = TargetCommand(xnt.xenant.load_build(path))
-    return command.run(targets=targets, props=props)
+    os.chdir(path)
+    error_code = command.run(targets=targets, props=props)
+    os.chdir(cwd)
+    return error_code
 
 def call(command, stdout=None, stderr=None):
     """ Execute the given command, redirecting stdout and stderr