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##############################################################################
# Copyright (c) 2017 HUAWEI TECHNOLOGIES CO.,LTD and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################

import yaml
import os
import sys


def load_env():
    cache_dir = os.environ.get('CACHE_DIR')
    print "Read local Cache dir is %s" % cache_dir
    return cache_dir


def get_from_cache(cache, package):
    filename = package.get("name")
    remotefile = package.get("url")
    localfile = cache + "/" + filename
    localmd5file = localfile + ".md5"
    remotemd5file = remotefile + ".md5"
    print "removing local md5 file...."
    cmd = "rm -f " + localmd5file
    os.system(cmd)
    print "downloading remote md5 file to local...."
    cmd = "curl --connect-timeout 10 -o " + localmd5file + " " + remotemd5file
    os.system(cmd)
    if os.path.exists(localmd5file):
        print "calculate md5sum of local file"
        cmd = "md5sum " + localfile + "|cut -d ' ' -f 1"
        localmd5sum = os.popen(cmd).readlines()
        cmd = "cat " + localmd5file + "|cut -d ' ' -f 1"
        remotemd5sum = os.popen(cmd).readlines()
        print "md5 local %s remote %s" % (localmd5sum, remotemd5sum)
        if (remotemd5sum == localmd5sum):
            print "Same with remote, no need to download...."
            return
    print "downloading remote file to local...."
    cmd = "curl --connect-timeout 10 -o " + localfile + " " + remotefile
    print cmd
    os.system(cmd)


def get_from_git(cache, package):
    localfile = cache + "/" + package.get("name")
    cmd = "rm -rf " + localfile
    print cmd
    os.system(cmd)
    cmd = "git clone " + package.get("url") + " " + localfile
    print cmd
    os.system(cmd)


def get_from_docker(cache, package):
    cmd = "sudo docker pull "+package.get("url")
    os.system(cmd)
    cmd = "sudo docker save "+package.get("url")+" -o "+cache+"/"
    cmd += package.get("name")+".tar"
    os.system(cmd)


def get_from_curl(cache, package):
    cmd = "curl --connect-timeout 10 -o " + cache + "/"
    cmd += package.get("name") + " " + package.get("url")
    print cmd
    os.system(cmd)


def usage():
    print "cached : Download from a cached server"
    print "git    : Download from git url"
    print "curl   : Download from a url link by curl"
    print "docker : Download from docker hub"


def build_parser(build_file_name):
    cache = load_env()
    cfg = yaml.safe_load(file(build_file_name, 'r'))

    print "Starting building...."
    for pkg in cfg.get("packages"):
        print "processing %s" % pkg.get("description")

        if pkg.get("get_method") == "cached":
            get_from_cache(cache, pkg)
        elif pkg.get("get_method") == "git":
            get_from_git(cache, pkg)
        elif pkg.get("get_method") == "docker":
            get_from_docker(cache, pkg)
        elif pkg.get("get_method") == "curl":
            get_from_curl(cache, pkg)
        else:
            usage

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("parameter wrong%d %s" % (len(sys.argv), sys.argv))
        sys.exit(1)
    build_parser(sys.argv[1])