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#!/usr/bin/env python3 # This file is part of cloud-init. See LICENSE file for license information. """Generate multi-part mime messages for user-data.""" import argparse import sys from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from cloudinit import log from cloudinit.cmd.devel import addLogHandlerCLI from cloudinit.handlers import INCLUSION_TYPES_MAP NAME = "make-mime" LOG = log.getLogger(NAME) EPILOG = ( "Example: make-mime -a config.yaml:cloud-config " "-a script.sh:x-shellscript > user-data" ) def create_mime_message(files): sub_messages = [] errors = [] for i, (fh, filename, format_type) in enumerate(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 get_content_types(): msg = ( "content type %r for attachment %s " "may be incorrect!" ) % (content_type, i + 1) errors.append(msg) sub_messages.append(sub_message) combined_message = MIMEMultipart() for msg in sub_messages: combined_message.attach(msg) return (combined_message, errors) def file_content_type(text): """Return file content type by reading the first line of the input.""" try: filename, content_type = text.split(":", 1) return (open(filename, "r"), filename, content_type.strip()) except ValueError as e: raise argparse.ArgumentError( text, "Invalid value for %r" % (text) ) from e def get_parser(parser=None): """Build or extend and arg parser for make-mime utility. @param parser: Optional existing ArgumentParser instance representing the subcommand which will be extended to support the args of this utility. @returns: ArgumentParser with proper argument configuration. """ if not parser: parser = argparse.ArgumentParser() # update the parser's doc and add an epilog to show an example parser.description = __doc__ parser.epilog = EPILOG parser.add_argument( "-a", "--attach", dest="files", type=file_content_type, action="append", default=[], metavar="<file>:<content-type>", help="attach the given file as the specified content-type", ) parser.add_argument( "-l", "--list-types", action="store_true", default=False, help="List support cloud-init content types.", ) parser.add_argument( "-f", "--force", action="store_true", default=False, help="Ignore unknown content-type warnings", ) return parser def get_content_types(strip_prefix=False): """Return a list of cloud-init supported content types. Optionally strip out the leading 'text/' of the type if strip_prefix=True. """ return sorted( [ ctype.replace("text/", "") if strip_prefix else ctype for ctype in INCLUSION_TYPES_MAP.values() ] ) def handle_args(name, args): """Create a multi-part MIME archive for use as user-data. Optionally print out the list of supported content types of cloud-init. Also setup CLI log handlers to report to stderr since this is a development utility which should be run by a human on the CLI. @return 0 on success, 1 on failure. """ addLogHandlerCLI(LOG, log.DEBUG if args.debug else log.WARNING) if args.list_types: print("\n".join(get_content_types(strip_prefix=True))) return 0 combined_message, errors = create_mime_message(args.files) if errors: level = "WARNING" if args.force else "ERROR" for error in errors: sys.stderr.write(f"{level}: {error}\n") sys.stderr.write("Invalid content-types, override with --force\n") if not args.force: return 1 print(combined_message) return 0 def main(): args = get_parser().parse_args() return handle_args(NAME, args) if __name__ == "__main__": sys.exit(main())
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