# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

"""Runcmd: run arbitrary commands at rc.local with output to the console"""

import os
from textwrap import dedent

from cloudinit import util
from cloudinit.config.schema import get_meta_doc, validate_cloudconfig_schema
from cloudinit.distros import ALL_DISTROS
from cloudinit.settings import PER_INSTANCE

# The schema definition for each cloud-config module is a strict contract for
# describing supported configuration parameters for each cloud-config section.
# It allows cloud-config to validate and alert users to invalid or ignored
# configuration options before actually attempting to deploy with said
# configuration.

distros = [ALL_DISTROS]

meta = {
    "id": "cc_runcmd",
    "name": "Runcmd",
    "title": "Run arbitrary commands",
    "description": dedent(
        """\
        Run arbitrary commands at a rc.local like level with output to the
        console. Each item can be either a list or a string. If the item is a
        list, it will be properly executed as if passed to ``execve()`` (with
        the first arg as the command). If the item is a string, it will be
        written to a file and interpreted
        using ``sh``.

        .. note::

          all commands must be proper yaml, so you have to quote any characters
          yaml would eat (':' can be problematic)

        .. note::

          when writing files, do not use /tmp dir as it races with
          systemd-tmpfiles-clean LP: #1707222. Use /run/somedir instead.
    """
    ),
    "distros": distros,
    "examples": [
        dedent(
            """\
        runcmd:
            - [ ls, -l, / ]
            - [ sh, -xc, "echo $(date) ': hello world!'" ]
            - [ sh, -c, echo "=========hello world'=========" ]
            - ls -l /root
            - [ wget, "http://example.org", -O, /tmp/index.html ]
    """
        )
    ],
    "frequency": PER_INSTANCE,
}

schema = {
    "type": "object",
    "properties": {
        "runcmd": {
            "type": "array",
            "items": {
                "oneOf": [
                    {"type": "array", "items": {"type": "string"}},
                    {"type": "string"},
                    {"type": "null"},
                ]
            },
            "additionalItems": False,  # Reject items of non-string non-list
            "additionalProperties": False,
            "minItems": 1,
        }
    },
}

__doc__ = get_meta_doc(meta, schema)  # Supplement python help()


def handle(name, cfg, cloud, log, _args):
    if "runcmd" not in cfg:
        log.debug(
            "Skipping module named %s, no 'runcmd' key in configuration", name
        )
        return

    validate_cloudconfig_schema(cfg, schema)
    out_fn = os.path.join(cloud.get_ipath("scripts"), "runcmd")
    cmd = cfg["runcmd"]
    try:
        content = util.shellify(cmd)
        util.write_file(out_fn, content, 0o700)
    except Exception as e:
        raise type(e)("Failed to shellify {} into file {}".format(cmd, out_fn))


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