Fix devstructure#118.

bin/blueprint-create

@@ -7,6 +7,7 @@ import sys
 
 import blueprint.cli
 from blueprint import context_managers
+import blueprint.git
 
 parser = optparse.OptionParser('Usage: %prog [-d <subtrahend>] [-P|-C|-S|...] '
                                '[-m <message>] [-r] [-q] <name>')
@@ -57,6 +58,14 @@ if 1 != len(args):
     parser.print_usage()
     sys.exit(1)
 
+if not blueprint.git.configured():
+    logging.error('please give Git your name and email address so commits have an author')
+    logging.error('')
+    logging.error('    git config --global user.email "[email protected]"')
+    logging.error('    git config --global user.name "Your Name"')
+    logging.error('')
+    sys.exit(1)
+
 b = blueprint.cli.create(options, args)
 
 try:

blueprint/git.py

@@ -180,3 +180,12 @@ def commit_tree(tree, message='', parent=None):
     if 0 != status:
         return None
     return stdout.rstrip()
+
+
+def configured():
+    """
+    Return `True` if the author is configured in Git.  This allows Blueprint
+    to bail out early for users that don't have things configured just right.
+    """
+    return not git('config', 'user.name', raise_exc=False)[0] \
+       and not git('config', 'user.email', raise_exc=False)[0]