From a4b6b96f30bdd994ab535b222cf4b4bf09f20668 Mon Sep 17 00:00:00 2001 From: Ryan Harper Date: Mon, 17 Aug 2020 11:06:20 -0500 Subject: cli: add devel make-mime subcommand (#518) * cli: add devel make-mime subcommand Cloud-init documents an in-source-tree tool, make-mime.py used to help users create multi-part mime user-data. This tool is not shipped in the cloud-init install and unavailable at runtime. This patch takes tools/make-mime.py and makes the functionality available via the devel subcommand. The primary interface of --attach file:content-type is still present. The cli now adds: -l, --list-types Print out a list of supported content-types -f, --force Ignore errors for unsupported content-types The tool will now raise a RunTime error if the supplied content-type is not supported (or more likely a typo: x-shell-script vs. x-shellscript) * make-mime: write to stderr and exit 1 instead of raising RuntimeError * Update example to match docs * Update docs for make-mime subcommand * Remove tools/make-mime.py; replaced by cloud-init devel make-mime Co-authored-by: Rick Harding --- cloudinit/cmd/devel/make_mime.py | 112 +++++++++++++++++++++++++++++++++++++++ cloudinit/cmd/devel/parser.py | 5 +- 2 files changed, 116 insertions(+), 1 deletion(-) create mode 100755 cloudinit/cmd/devel/make_mime.py (limited to 'cloudinit') diff --git a/cloudinit/cmd/devel/make_mime.py b/cloudinit/cmd/devel/make_mime.py new file mode 100755 index 00000000..77e10540 --- /dev/null +++ b/cloudinit/cmd/devel/make_mime.py @@ -0,0 +1,112 @@ +# 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.handlers import INCLUSION_TYPES_MAP +from . import addLogHandlerCLI + +NAME = 'make-mime' +LOG = log.getLogger(NAME) +EPILOG = ("Example: make-mime -a config.yaml:cloud-config " + "-a script.sh:x-shellscript > user-data") + + +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: + raise argparse.ArgumentError(text, "Invalid value for %r" % (text)) + + +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=":", + 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 + + sub_messages = [] + errors = [] + 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 get_content_types(): + level = "WARNING" if args.force else "ERROR" + msg = (level + ": content type %r for attachment %s " + "may be incorrect!") % (content_type, i + 1) + sys.stderr.write(msg + '\n') + errors.append(msg) + sub_messages.append(sub_message) + if len(errors) and not args.force: + sys.stderr.write("Invalid content-types, override with --force\n") + return 1 + combined_message = MIMEMultipart() + for msg in sub_messages: + combined_message.attach(msg) + print(combined_message) + return 0 + + +def main(): + args = get_parser().parse_args() + return(handle_args(NAME, args)) + + +if __name__ == '__main__': + sys.exit(main()) + + +# vi: ts=4 expandtab diff --git a/cloudinit/cmd/devel/parser.py b/cloudinit/cmd/devel/parser.py index 99a234ce..1a3c46a4 100644 --- a/cloudinit/cmd/devel/parser.py +++ b/cloudinit/cmd/devel/parser.py @@ -9,6 +9,7 @@ from cloudinit.config import schema from . import net_convert from . import render +from . import make_mime def get_parser(parser=None): @@ -25,7 +26,9 @@ def get_parser(parser=None): (net_convert.NAME, net_convert.__doc__, net_convert.get_parser, net_convert.handle_args), (render.NAME, render.__doc__, - render.get_parser, render.handle_args) + render.get_parser, render.handle_args), + (make_mime.NAME, make_mime.__doc__, + make_mime.get_parser, make_mime.handle_args), ] for (subcmd, helpmsg, get_parser, handler) in subcmds: parser = subparsers.add_parser(subcmd, help=helpmsg) -- cgit v1.2.3