# Development tool - deploy/undeploy command plugin
#
# Copyright (C) 2014-2015 Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Devtool plugin containing the deploy subcommands"""

import os
import subprocess
import logging
from devtool import exec_fakeroot, setup_tinfoil, DevtoolError

logger = logging.getLogger('devtool')

def deploy(args, config, basepath, workspace):
    """Entry point for the devtool 'deploy' subcommand"""
    import re
    import oe.recipeutils

    if not args.recipename in workspace:
        raise DevtoolError("no recipe named %s in your workspace" %
                           args.recipename)
    try:
        host, destdir = args.target.split(':')
    except ValueError:
        destdir = '/'
    else:
        args.target = host

    deploy_dir = os.path.join(basepath, 'target_deploy', args.target)
    deploy_file = os.path.join(deploy_dir, args.recipename + '.list')

    tinfoil = setup_tinfoil()
    try:
        rd = oe.recipeutils.parse_recipe_simple(tinfoil.cooker, args.recipename, tinfoil.config_data)
    except Exception as e:
        raise DevtoolError('Exception parsing recipe %s: %s' %
                           (args.recipename, e))
    recipe_outdir = rd.getVar('D', True)
    if not os.path.exists(recipe_outdir) or not os.listdir(recipe_outdir):
        raise DevtoolError('No files to deploy - have you built the %s '
                           'recipe? If so, the install step has not installed '
                           'any files.' % args.recipename)

    if args.dry_run:
        print('Files to be deployed for %s on target %s:' % (args.recipename, args.target))
        for root, _, files in os.walk(recipe_outdir):
            for fn in files:
                print('  %s' % os.path.join(destdir, os.path.relpath(root, recipe_outdir), fn))
        return 0

    if os.path.exists(deploy_file):
        if undeploy(args, config, basepath, workspace):
            # Error already shown
            return 1

    extraoptions = ''
    if args.no_host_check:
        extraoptions += '-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'
    if args.show_status:
        tarextractopts = 'xv'
    else:
        tarextractopts = 'x'
        extraoptions += ' -q'
    # We cannot use scp here, because it doesn't preserve symlinks
    ret = exec_fakeroot(rd, 'tar cf - . | ssh %s %s \'tar %s -C %s -f -\'' % (extraoptions, args.target, tarextractopts, destdir), cwd=recipe_outdir, shell=True)
    if ret != 0:
        raise DevtoolError('Deploy failed - rerun with -s to get a complete '
                           'error message')

    logger.info('Successfully deployed %s' % recipe_outdir)

    if not os.path.exists(deploy_dir):
        os.makedirs(deploy_dir)

    files_list = []
    for root, _, files in os.walk(recipe_outdir):
        for filename in files:
            filename = os.path.relpath(os.path.join(root, filename), recipe_outdir)
            files_list.append(os.path.join(destdir, filename))

    with open(deploy_file, 'w') as fobj:
        fobj.write('\n'.join(files_list))

    return 0

def undeploy(args, config, basepath, workspace):
    """Entry point for the devtool 'undeploy' subcommand"""
    deploy_file = os.path.join(basepath, 'target_deploy', args.target, args.recipename + '.list')
    if not os.path.exists(deploy_file):
        raise DevtoolError('%s has not been deployed' % args.recipename)

    if args.dry_run:
        print('Previously deployed files to be un-deployed for %s on target %s:' % (args.recipename, args.target))
        with open(deploy_file, 'r') as f:
            for line in f:
                print('  %s' % line.rstrip())
        return 0

    extraoptions = ''
    if args.no_host_check:
        extraoptions += '-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'
    if not args.show_status:
        extraoptions += ' -q'

    ret = subprocess.call("scp %s %s %s:/tmp" % (extraoptions, deploy_file, args.target), shell=True)
    if ret != 0:
        raise DevtoolError('Failed to copy file list to %s - rerun with -s to '
                           'get a complete error message' % args.target)

    ret = subprocess.call("ssh %s %s 'xargs -n1 rm -f </tmp/%s'" % (extraoptions, args.target, os.path.basename(deploy_file)), shell=True)
    if ret == 0:
        logger.info('Successfully undeployed %s' % args.recipename)
        os.remove(deploy_file)
    else:
        raise DevtoolError('Undeploy failed - rerun with -s to get a complete '
                           'error message')

    return ret


def register_commands(subparsers, context):
    """Register devtool subcommands from the deploy plugin"""
    parser_deploy = subparsers.add_parser('deploy-target', help='Deploy recipe output files to live target machine')
    parser_deploy.add_argument('recipename', help='Recipe to deploy')
    parser_deploy.add_argument('target', help='Live target machine running an ssh server: user@hostname[:destdir]')
    parser_deploy.add_argument('-c', '--no-host-check', help='Disable ssh host key checking', action='store_true')
    parser_deploy.add_argument('-s', '--show-status', help='Show progress/status output', action='store_true')
    parser_deploy.add_argument('-n', '--dry-run', help='List files to be deployed only', action='store_true')
    parser_deploy.set_defaults(func=deploy)

    parser_undeploy = subparsers.add_parser('undeploy-target', help='Undeploy recipe output files in live target machine')
    parser_undeploy.add_argument('recipename', help='Recipe to undeploy')
    parser_undeploy.add_argument('target', help='Live target machine running an ssh server: user@hostname')
    parser_undeploy.add_argument('-c', '--no-host-check', help='Disable ssh host key checking', action='store_true')
    parser_undeploy.add_argument('-s', '--show-status', help='Show progress/status output', action='store_true')
    parser_undeploy.add_argument('-n', '--dry-run', help='List files to be undeployed only', action='store_true')
    parser_undeploy.set_defaults(func=undeploy)