Add in a tool to help make mime multipart messages.

tools/make-mime.py

@@ -0,0 +1,60 @@
+#!/usr/bin/python
+
+import argparse
+import sys
+
+from email.mime.multipart import MIMEMultipart
+from email.mime.text import MIMEText
+
+KNOWN_CONTENT_TYPES = [
+    'text/x-include-once-url',
+    'text/x-include-url',
+    'text/cloud-config-archive',
+    'text/upstart-job',
+    'text/cloud-config',
+    'text/part-handler',
+    'text/x-shellscript',
+    'text/cloud-boothook',
+]
+
+
+def file_content_type(text):
+    try:
+        filename, content_type = text.split(":", 1)
+        return (open(filename, 'r'), filename, content_type.strip())
+    except:
+        raise argparse.ArgumentError("Invalid value for %r" % (text))
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-a", "--attach",
+                        dest="files",
+                        type=file_content_type,
+                        action='append',
+                        default=[],
+                        required=True,
+                        metavar="<file>:<content-type>",
+                        help="attach the given file in the specified "
+                             "content type")
+    args = parser.parse_args()
+    sub_messages = []
+    for i, (fh, filename, format_type) in enumerate(args.files):
+        contents = fh.read()
+        sub_message = MIMEText(contents, format_type, sys.getdefaultencoding())
+        sub_message.add_header('Content-Disposition',
+                               'attachment; filename="%s"' % (filename))
+        content_type = sub_message.get_content_type().lower()
+        if content_type not in KNOWN_CONTENT_TYPES:
+            sys.stderr.write(("WARNING: content type %r for attachment %s "
+                             "may be incorrect!\n") % (content_type, i + 1))
+        sub_messages.append(sub_message)
+    combined_message = MIMEMultipart()
+    for msg in sub_messages:
+        combined_message.attach(msg)
+    print(combined_message)
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())