#!/usr/bin/env python3

import os
import pathlib
import re
import requests
import shutil
import stat
import sys
import subprocess
import tarfile
import vagrant
import hashlib
import yaml
import math
import json
from clint.textui import progress
from optparse import OptionParser
import fdroidserver.tail


if not os.path.exists('makebuildserver') and not os.path.exists('buildserver'):
    print('This must be run as ./makebuildserver in fdroidserver.git!')
    sys.exit(1)


tail = None

parser = OptionParser()
parser.add_option("-v", "--verbose", action="store_true", default=False,
                  help="Spew out even more information than normal")
parser.add_option("-c", "--clean", action="store_true", default=False,
                  help="Build from scratch, rather than attempting to update the existing server")
options, args = parser.parse_args()

# set up default config
cachedir = os.path.join(os.getenv('HOME'), '.cache', 'fdroidserver')
config = {
    'basebox': 'jessie64',
    'baseboxurl': [
        pathlib.Path(os.path.join(cachedir, 'jessie64.box')).as_uri(),
        'https://f-droid.org/jessie64.box',
    ],
    'debian_mirror': 'http://http.debian.net/debian/',
    'apt_package_cache': False,
    'copy_caches_from_host': False,
    'boot_timeout': 600,
    'cachedir': cachedir,
    'cpus': 1,
    'memory': 1024,
    'hwvirtex': 'off',
    'vm_provider': 'virtualbox',
}

if os.path.isfile('/usr/bin/systemd-detect-virt'):
    try:
        virt = subprocess.check_output('/usr/bin/systemd-detect-virt').strip().decode('utf-8')
    except subprocess.CalledProcessError as e:
        virt = 'none'
    if virt == 'qemu' or virt == 'kvm' or virt == 'bochs':
        print('Running in a VM guest, defaulting to QEMU/KVM via libvirt')
        config['vm_provider'] = 'libvirt'
        config['domain'] = 'buildserver_default'
    elif virt != 'none':
        print('Running in an unsupported VM guest (' + virt + ')!')

# load config file, if present
if os.path.exists('makebuildserver.config.py'):
    exec(compile(open('makebuildserver.config.py').read(), 'makebuildserver.config.py', 'exec'), config)
elif os.path.exists('makebs.config.py'):
    # this is the old name for the config file
    exec(compile(open('makebs.config.py').read(), 'makebs.config.py', 'exec'), config)
if '__builtins__' in config:
    del(config['__builtins__'])  # added by compile/exec

# Update cached files.
cachedir = config['cachedir']
if not os.path.exists(cachedir):
    os.makedirs(cachedir, 0o755)

if config['vm_provider'] == 'libvirt':
    tmp = cachedir
    while tmp != '/':
        mode = os.stat(tmp).st_mode
        if not (stat.S_IXUSR & mode and stat.S_IXGRP & mode and stat.S_IXOTH & mode):
            print('ERROR:', tmp, 'will not be accessible to the VM!  To fix, run:')
            print('  chmod a+X', tmp)
            sys.exit(1)
        tmp = os.path.dirname(tmp)

if config['apt_package_cache']:
    config['aptcachedir'] = cachedir + '/apt/archives'

cachefiles = [
    ('https://dl.google.com/android/repository/tools_r25.2.3-linux.zip',
     '1b35bcb94e9a686dff6460c8bca903aa0281c6696001067f34ec00093145b560'),
    ('https://dl.google.com/android/repository/android_m2repository_r47.zip',
     'a3f91808dce50c1717737de90c18479ed3a78b147e06985247d138e7ab5123d0'),
    ('https://dl.google.com/android/repository/android-1.5_r04-linux.zip',
     '85b6c8f9797e56aa415d3a282428bb640c96b0acb17c11d41621bb2a5302fe64'),
    ('https://dl.google.com/android/repository/android-1.6_r03-linux.zip',
     'a8c4e3b32269c6b04c2adeabd112fce42f292dab1a40ef3b08ea7d4212be0df4'),
    ('https://dl.google.com/android/repository/android-2.0_r01-linux.zip',
     'e70e2151b49613f23f40828c771ab85e241eed361cab037c6312df77f2612f0a'),
    ('https://dl.google.com/android/repository/android-2.0.1_r01-linux.zip',
     'f47b46177b17f6368461f85bc2a27d0d2c437929f588ea27105712bc3185f664'),
    ('https://dl.google.com/android/repository/android-2.1_r03.zip',
     'b9cc140a9b879586181b22cfc7d4aa18b979251e16e9b17771c5d0acb71ba940'),
    ('https://dl.google.com/android/repository/android-2.2_r03.zip',
     '7c9ea1bd7cb225504bd085d7c93ae27d52bd88d29b621d28108f82fef68177c0'),
    ('https://dl.google.com/android/repository/android-2.3.1_r02.zip',
     'b2ab4896d0a4857e4f688f69eb08b0e1a8074709d4445a92a83ece7ec7cd198c'),
    ('https://dl.google.com/android/repository/android-2.3.3_r02.zip',
     '54bdb0f1ca06ba5747061ddeea20f431af72c448334fd4d3d7f84ea2ccd29fea'),
    ('https://dl.google.com/android/repository/android-3.0_r02.zip',
     '1cacae7b6e1b5a5d73c06f5d29d2ea92d16674df8fd5507681290e77d1647a1c'),
    ('https://dl.google.com/android/repository/android-3.1_r03.zip',
     '7570c86a86488a146aa2141a65a24d81800959c1907ff4f1d2c13bbafab230c5'),
    ('https://dl.google.com/android/repository/android-3.2_r01.zip',
     'ff6b26ad34d7060a72ba504b0314cef8ba3138005561705adec5ad470a073d9b'),
    ('https://dl.google.com/android/repository/android-14_r04.zip',
     'da1af15c77ba41d062eb6d0ef5921cc424ab6167587033b830609d65f04802b6'),
    ('https://dl.google.com/android/repository/android-15_r05.zip',
     '5bc1f93aae86b4336ffc4cae9eb8ec41a9a8fd677582dd86a9629798f019bed9'),
    ('https://dl.google.com/android/repository/android-16_r05.zip',
     'fd7f269a423d1f1d079eabf9f918ceab49108702a1c6bb2589d57c23393503d3'),
    ('https://dl.google.com/android/repository/android-17_r03.zip',
     'b66e73fb2639f8c916fde4369aa29012a5c531e156dbb205fe3788fe998fbbe8'),
    ('https://dl.google.com/android/repository/android-18_r03.zip',
     '166ae9cf299747a5faa8f04168f0ee47cd7466a975d8b44acaaa62a43e767568'),
    ('https://dl.google.com/android/repository/android-19_r04.zip',
     '5efc3a3a682c1d49128daddb6716c433edf16e63349f32959b6207524ac04039'),
    ('https://dl.google.com/android/repository/android-20_r02.zip',
     'ef08c453e16ab6e656cf5d9413ef61cb8c650607d33b24ee4ce08dafdfe965a7'),
    ('https://dl.google.com/android/repository/android-21_r02.zip',
     'a76cd7ad3080ac6ce9f037cb935b399a1bad396c0605d4ff42f693695f1dcefe'),
    ('https://dl.google.com/android/repository/android-22_r02.zip',
     '45eb581bbe53c9256f34c26b2cea919543c0079140897ac721cf88c0b9f6789e'),
    ('https://dl.google.com/android/repository/platform-23_r03.zip',
     '4b4bcddead3319708275c54c76294707bfaa953d767e34f1a5b599f3edd0076c'),
    ('https://dl.google.com/android/repository/platform-24_r02.zip',
     'f268f5945c6ece7ea95c1c252067280854d2a20da924e22ae4720287df8bdbc9'),
    ('https://dl.google.com/android/repository/platform-25_r01.zip',
     'da519dc3e07b8cb879265c94f798262c1f90791dfaa8b745d34883891378438e'),
    ('https://dl.google.com/android/repository/build-tools_r17-linux.zip',
     '4c8444972343a19045236f6924bd7f12046287c70dace96ab88b2159c8ec0e74'),
    ('https://dl.google.com/android/repository/build-tools_r18.0.1-linux.zip',
     'a9b7b1bdfd864780fdd03fa1683f3fe712a4276cf200646833808cb9159bafc0'),
    ('https://dl.google.com/android/repository/build-tools_r18.1-linux.zip',
     '0753606738f31cc346426db1d46b7d021bc1bdaff63085f9ee9d278ee054d3c9'),
    ('https://dl.google.com/android/repository/build-tools_r18.1.1-linux.zip',
     '7e4ed326b53078f4f23276ddab52c400011f7593dfbb6508c0a6671954dba8b0'),
    ('https://dl.google.com/android/repository/build-tools_r19-linux.zip',
     '9442e1c5212ed594e344a231fa93e7a017a5ef8cc661117011f1d3142eca7acc'),
    ('https://dl.google.com/android/repository/build-tools_r19.0.1-linux.zip',
     'b068edaff05c3253a63e9c8f0e1786429799b7e4b01514a847a8b291beb9232e'),
    ('https://dl.google.com/android/repository/build-tools_r19.0.2-linux.zip',
     '06124fad0d4bde21191240d61df2059a8546c085064a9a57d024c36fa2c9bebb'),
    ('https://dl.google.com/android/repository/build-tools_r19.0.3-linux.zip',
     'bc9b3db0de4a3e233a170274293359051a758f1e3f0d0d852ff4ad6d90d0a794'),
    ('https://dl.google.com/android/repository/build-tools_r19.1-linux.zip',
     '3833b409f78c002a83244e220be380ea6fa44d604e0d47de4b7e5daefe7cd3f4'),
    ('https://dl.google.com/android/repository/build-tools_r20-linux.zip',
     '296e09d62095d80e6eaa06a64cfa4c6f9f317c2d67ad8da6514523ec66f5c871'),
    ('https://dl.google.com/android/repository/build-tools_r21-linux.zip',
     '12b818f38fe1b68091b94545988317438efbf41eb61fd36b72cd79f536044065'),
    ('https://dl.google.com/android/repository/build-tools_r21.0.1-linux.zip',
     'a8922e80d3dd0cf6df14b29a7862448fa111b48086c639168d4b18c92431f559'),
    ('https://dl.google.com/android/repository/build-tools_r21.0.2-linux.zip',
     '859b17a6b65d063dfd86c163489b736b12bdeecd9173fdddb3e9f32e0fe584b7'),
    ('https://dl.google.com/android/repository/build-tools_r21.1-linux.zip',
     '022a85b92360272379b2f04b8a4d727e754dbe7eb8ab5a9568190e33e480d8f1'),
    ('https://dl.google.com/android/repository/build-tools_r21.1.1-linux.zip',
     '29b612484de6b5cde0df6de655e413f7611b0557b440538397afa69b557e2f08'),
    ('https://dl.google.com/android/repository/build-tools_r21.1.2-linux.zip',
     '3f88efc2d5316fb73f547f35b472610eed5e6f3f56762750ddad1c7d1d81660d'),
    ('https://dl.google.com/android/repository/build-tools_r22-linux.zip',
     '061c021243f04c80c19568a6e3a027c00d8e269c9311d7bf07fced60fbde7bd5'),
    ('https://dl.google.com/android/repository/build-tools_r22.0.1-linux.zip',
     '91e5524bf227aad1135ddd10905518ac49f74797d33d48920dcf8364b9fde214'),
    ('https://dl.google.com/android/repository/build-tools_r23-linux.zip',
     '56bf4fc6c43638c55fef4a0937bad38281945725459841879b436c6922df786c'),
    ('https://dl.google.com/android/repository/build-tools_r23.0.1-linux.zip',
     'e56b3ef7b760ad06a7cee9b2d52ba7f43133dcecedfa5357f8845b3a80aeeecf'),
    ('https://dl.google.com/android/repository/build-tools_r23.0.2-linux.zip',
     '82754f551a6e36eaf516fbdd00c95ff0ccd19f81d1e134125b6ac4916f7ed9b6'),
    ('https://dl.google.com/android/repository/build-tools_r23.0.3-linux.zip',
     'd961663d4a9e128841751c0156548a347c882c081c83942e53788d8949bf34e1'),
    ('https://dl.google.com/android/repository/build-tools_r24-linux.zip',
     'b4871f357224c5f660fd2bbee04d8c7d1c187eeddfd9702cc84503529e3b3724'),
    ('https://dl.google.com/android/repository/build-tools_r24.0.1-linux.zip',
     'a38ac637db357a31e33e38248399cb0edcc15040dca041370da38b6daf50c84d'),
    ('https://dl.google.com/android/repository/build-tools_r24.0.2-linux.zip',
     '924e29b8a189afbd119d44eae450fc0c9f197ed6f835df223931e45007987d95'),
    ('https://dl.google.com/android/repository/build-tools_r24.0.3-linux.zip',
     'f2c02eb1d7e41ce314b5dac50440e7595380c4dd45b41ea1d7b0f86e49516927'),
    ('https://dl.google.com/android/repository/build-tools_r25-linux.zip',
     '74eb6931fd7a56859bd8e35d8d73ca8fe7ba6bfd4b7ffe560fe58b7354f2e3aa'),
    ('https://dl.google.com/android/repository/build-tools_r25.0.1-linux.zip',
     '671b4e00f5b986c7355507c7024b725a4b4cadf11ca61fa5b1334ec6ea57d94f'),
    ('https://dl.google.com/android/repository/build-tools_r25.0.2-linux.zip',
     '1d7ac9b6def16fb0254ec23c135c02dd9f6908073352a20315a017e4b2a904b0'),
    # the binaries that Google uses are here:
    # https://android.googlesource.com/platform/tools/external/gradle/+/studio-1.5/
    ('https://services.gradle.org/distributions/gradle-1.4-bin.zip',
     'cd99e85fbcd0ae8b99e81c9992a2f10cceb7b5f009c3720ef3a0078f4f92e94e'),
    ('https://services.gradle.org/distributions/gradle-1.6-bin.zip',
     'de3e89d2113923dcc2e0def62d69be0947ceac910abd38b75ec333230183fac4'),
    ('https://services.gradle.org/distributions/gradle-1.7-bin.zip',
     '360c97d51621b5a1ecf66748c718594e5f790ae4fbc1499543e0c006033c9d30'),
    ('https://services.gradle.org/distributions/gradle-1.8-bin.zip',
     'a342bbfa15fd18e2482287da4959588f45a41b60910970a16e6d97959aea5703'),
    ('https://services.gradle.org/distributions/gradle-1.9-bin.zip',
     '097ddc2bcbc9da2bb08cbf6bf8079585e35ad088bafd42e8716bc96405db98e9'),
    ('https://services.gradle.org/distributions/gradle-1.10-bin.zip',
     '6e6db4fc595f27ceda059d23693b6f6848583950606112b37dfd0e97a0a0a4fe'),
    ('https://services.gradle.org/distributions/gradle-1.11-bin.zip',
     '07e235df824964f0e19e73ea2327ce345c44bcd06d44a0123d29ab287fc34091'),
    ('https://services.gradle.org/distributions/gradle-1.12-bin.zip',
     '8734b13a401f4311ee418173ed6ca8662d2b0a535be8ff2a43ecb1c13cd406ea'),
    ('https://services.gradle.org/distributions/gradle-2.1-bin.zip',
     '3eee4f9ea2ab0221b89f8e4747a96d4554d00ae46d8d633f11cfda60988bf878'),
    ('https://services.gradle.org/distributions/gradle-2.2-bin.zip',
     '91e5655fe11ef414449f218c4fa2985b3a49b7903c57556da109c84fa26e1dfb'),
    ('https://services.gradle.org/distributions/gradle-2.2.1-bin.zip',
     '420aa50738299327b611c10b8304b749e8d3a579407ee9e755b15921d95ff418'),
    ('https://services.gradle.org/distributions/gradle-2.3-bin.zip',
     '010dd9f31849abc3d5644e282943b1c1c355f8e2635c5789833979ce590a3774'),
    ('https://services.gradle.org/distributions/gradle-2.4-bin.zip',
     'c4eaecc621a81f567ded1aede4a5ddb281cc02a03a6a87c4f5502add8fc2f16f'),
    ('https://services.gradle.org/distributions/gradle-2.5-bin.zip',
     '3f953e0cb14bb3f9ebbe11946e84071547bf5dfd575d90cfe9cc4e788da38555'),
    ('https://services.gradle.org/distributions/gradle-2.6-bin.zip',
     '18a98c560af231dfa0d3f8e0802c20103ae986f12428bb0a6f5396e8f14e9c83'),
    ('https://services.gradle.org/distributions/gradle-2.7-bin.zip',
     'cde43b90945b5304c43ee36e58aab4cc6fb3a3d5f9bd9449bb1709a68371cb06'),
    ('https://services.gradle.org/distributions/gradle-2.8-bin.zip',
     'a88db9c2f104defdaa8011c58cf6cda6c114298ae3695ecfb8beb30da3a903cb'),
    ('https://services.gradle.org/distributions/gradle-2.9-bin.zip',
     'c9159ec4362284c0a38d73237e224deae6139cbde0db4f0f44e1c7691dd3de2f'),
    ('https://services.gradle.org/distributions/gradle-2.10-bin.zip',
     '66406247f745fc6f05ab382d3f8d3e120c339f34ef54b86f6dc5f6efc18fbb13'),
    ('https://services.gradle.org/distributions/gradle-2.11-bin.zip',
     '8d7437082356c9fd6309a4479c8db307673965546daea445c6c72759cd6b1ed6'),
    ('https://services.gradle.org/distributions/gradle-2.12-bin.zip',
     'e77064981906cd0476ff1e0de3e6fef747bd18e140960f1915cca8ff6c33ab5c'),
    ('https://services.gradle.org/distributions/gradle-2.13-bin.zip',
     '0f665ec6a5a67865faf7ba0d825afb19c26705ea0597cec80dd191b0f2cbb664'),
    ('https://services.gradle.org/distributions/gradle-2.14-bin.zip',
     '993b4f33b652c689e9721917d8e021cab6bbd3eae81b39ab2fd46fdb19a928d5'),
    ('https://services.gradle.org/distributions/gradle-2.14.1-bin.zip',
     'cfc61eda71f2d12a572822644ce13d2919407595c2aec3e3566d2aab6f97ef39'),
    ('https://services.gradle.org/distributions/gradle-3.0-bin.zip',
     '39c906941a474444afbddc38144ed44166825acb0a57b0551dddb04bbf157f80'),
    ('https://services.gradle.org/distributions/gradle-3.1-bin.zip',
     'c7de3442432253525902f7e8d7eac8b5fd6ce1623f96d76916af6d0e383010fc'),
    ('https://services.gradle.org/distributions/gradle-3.2-bin.zip',
     '5321b36837226dc0377047a328f12010f42c7bf88ee4a3b1cee0c11040082935'),
    ('https://services.gradle.org/distributions/gradle-3.2.1-bin.zip',
     '9843a3654d3e57dce54db06d05f18b664b95c22bf90c6becccb61fc63ce60689'),
    ('https://services.gradle.org/distributions/gradle-3.3-bin.zip',
     'c58650c278d8cf0696cab65108ae3c8d95eea9c1938e0eb8b997095d5ca9a292'),
    ('https://services.gradle.org/distributions/gradle-3.4-bin.zip',
     '72d0cd4dcdd5e3be165eb7cd7bbd25cf8968baf400323d9ab1bba622c3f72205'),
    ('https://services.gradle.org/distributions/gradle-3.4.1-bin.zip',
     'db1db193d479cc1202be843f17e4526660cfb0b21b57d62f3a87f88c878af9b2'),
    ('https://services.gradle.org/distributions/gradle-3.5-bin.zip',
     '0b7450798c190ff76b9f9a3d02e18b33d94553f708ebc08ebe09bdf99111d110'),
    ('https://dl.google.com/android/ndk/android-ndk-r10e-linux-x86_64.bin',
     '102d6723f67ff1384330d12c45854315d6452d6510286f4e5891e00a5a8f1d5a'),
    ('https://dl.google.com/android/ndk/android-ndk-r9b-linux-x86_64.tar.bz2',
     '8956e9efeea95f49425ded8bb697013b66e162b064b0f66b5c75628f76e0f532'),
    ('https://dl.google.com/android/ndk/android-ndk-r9b-linux-x86_64-legacy-toolchains.tar.bz2',
     'de93a394f7c8f3436db44568648f87738a8d09801a52f459dcad3fc047e045a1'),
    ('https://dl.google.com/android/repository/android-ndk-r11c-linux-x86_64.zip',
     'ba85dbe4d370e4de567222f73a3e034d85fc3011b3cbd90697f3e8dcace3ad94'),
    ('https://dl.google.com/android/repository/android-ndk-r12b-linux-x86_64.zip',
     'eafae2d614e5475a3bcfd7c5f201db5b963cc1290ee3e8ae791ff0c66757781e'),
    ('https://dl.google.com/android/repository/android-ndk-r13b-linux-x86_64.zip',
     '3524d7f8fca6dc0d8e7073a7ab7f76888780a22841a6641927123146c3ffd29c'),
    ('https://dl.google.com/android/repository/android-ndk-r14-linux-x86_64.zip',
     '3e622c2c9943964ea44cd56317d0769ed4c811bb4b40dc45b1f6965e4db9aa44'),
    ('https://download.qt.io/official_releases/qt/5.7/5.7.0/qt-opensource-linux-x64-android-5.7.0.run',
     'f7e55b7970e59bdaabb88cb7afc12e9061e933992bda2f076f52600358644586'),
]


def sha256_for_file(path):
    with open(path, 'rb') as f:
        s = hashlib.sha256()
        while True:
            data = f.read(4096)
            if not data:
                break
            s.update(data)
        return s.hexdigest()


def destroy_current_image(v, serverdir):
    global config

    # cannot run vagrant without the config in the YAML file
    if os.path.exists(os.path.join(serverdir, 'Vagrantfile.yaml')):
        v.destroy()
    elif options.verbose:
        print('Cannot run destroy vagrant setup since Vagrantfile.yaml is not setup!')
    if config['vm_provider'] == 'libvirt':
        import libvirt
        try:
            virConnect = libvirt.open('qemu:///system')
            virDomain = virConnect.lookupByName(config['domain'])
            if virDomain:
                virDomain.undefineFlags(libvirt.VIR_DOMAIN_UNDEFINE_MANAGED_SAVE
                                        | libvirt.VIR_DOMAIN_UNDEFINE_SNAPSHOTS_METADATA
                                        | libvirt.VIR_DOMAIN_UNDEFINE_NVRAM)
            storagePool = virConnect.storagePoolLookupByName('default')
            if storagePool:
                for vol in storagePool.listAllVolumes():
                    vol.delete()
        except libvirt.libvirtError as e:
            print(e)


def kvm_package(boxfile):
    '''
    Hack to replace missing `vagrant package` for kvm, based  on the script
    `tools/create_box.sh from vagrant-libvirt
    '''
    import libvirt
    virConnect = libvirt.open('qemu:///system')
    storagePool = virConnect.storagePoolLookupByName('default')
    if storagePool:
        vol = storagePool.storageVolLookupByName(config['domain'] + '.img')
        imagepath = vol.path()
        # TODO use a libvirt storage pool to ensure the img file is readable
        subprocess.check_call(['sudo', '/bin/chmod', '-R', 'a+rX', '/var/lib/libvirt/images'])
        shutil.copy2(imagepath, 'box.img')
        subprocess.check_call(['qemu-img', 'rebase', '-p', '-b', '', 'box.img'])
        img_info_raw = subprocess.check_output('sudo qemu-img info --output=json box.img', shell=True)
        img_info = json.loads(img_info_raw.decode('utf-8'))
        metadata = {"provider": "libvirt",
                    "format": img_info['format'],
                    "virtual_size": math.ceil(img_info['virtual-size'] / 1024.**3),
                    }

        vagrantfile = """Vagrant.configure("2") do |config|
  config.ssh.username = "vagrant"
  config.ssh.password = "vagrant"

  config.vm.provider :libvirt do |libvirt|

    libvirt.driver = "kvm"
    libvirt.host = ""
    libvirt.connect_via_ssh = false
    libvirt.storage_pool_name = "default"

  end
end
"""
        with open('metadata.json', 'w') as fp:
            fp.write(json.dumps(metadata))
        with open('Vagrantfile', 'w') as fp:
            fp.write(vagrantfile)
        with tarfile.open(boxfile, 'w:gz') as tar:
            tar.add('metadata.json')
            tar.add('Vagrantfile')
            tar.add('box.img')
        os.remove('metadata.json')
        os.remove('Vagrantfile')
        os.remove('box.img')


def run_via_vagrant_ssh(v, cmdlist):
    if (isinstance(cmdlist, str) or isinstance(cmdlist, bytes)):
        cmd = cmdlist
    else:
        cmd = ' '.join(cmdlist)
    v._run_vagrant_command(['ssh', '-c', cmd])


def main():
    global cachedir, cachefiles, config, tail

    for srcurl, shasum in cachefiles:
        filename = os.path.basename(srcurl)
        local_filename = os.path.join(cachedir, filename)

        if os.path.exists(local_filename):
            local_length = os.path.getsize(local_filename)
        else:
            local_length = -1

        resume_header = {}
        download = True

        try:
            r = requests.head(srcurl, allow_redirects=True, timeout=60)
            if r.status_code == 200:
                content_length = int(r.headers.get('content-length'))
            else:
                content_length = local_length  # skip the download
        except requests.exceptions.RequestException as e:
            content_length = local_length  # skip the download
            print(e)

        if local_length == content_length:
            download = False
        elif local_length > content_length:
            print('deleting corrupt file from cache: ' + local_filename)
            os.remove(local_filename)
            print("Downloading " + filename + " to cache")
        elif local_length > -1 and local_length < content_length:
            print("Resuming download of " + local_filename)
            resume_header = {'Range': 'bytes=%d-%d' % (local_length, content_length)}
        else:
            print("Downloading " + filename + " to cache")

        if download:
            r = requests.get(srcurl, headers=resume_header,
                             stream=True, verify=False, allow_redirects=True)
            content_length = int(r.headers.get('content-length'))
            with open(local_filename, 'ab') as f:
                for chunk in progress.bar(r.iter_content(chunk_size=65536),
                                          expected_size=(content_length / 65536) + 1):
                    if chunk:  # filter out keep-alive new chunks
                        f.write(chunk)

        v = sha256_for_file(local_filename)
        if v == shasum:
            print("\t...shasum verified for " + local_filename)
        else:
            print("Invalid shasum of '" + v + "' detected for " + local_filename)
            os.remove(local_filename)
            sys.exit(1)

    local_qt_filename = os.path.join(cachedir, 'qt-opensource-linux-x64-android-5.7.0.run')
    print("Setting executable bit for " + local_qt_filename)
    os.chmod(local_qt_filename, 0o755)

    # use VirtualBox software virtualization if hardware is not available,
    # like if this is being run in kvm or some other VM platform, like
    # http://jenkins.debian.net, the values are 'on' or 'off'
    if sys.platform.startswith('darwin'):
        # all < 10 year old Macs work, and OSX servers as VM host are very
        # rare, but this could also be auto-detected if someone codes it
        config['hwvirtex'] = 'on'
    elif os.path.exists('/proc/cpuinfo'):
        with open('/proc/cpuinfo') as f:
            contents = f.read()
        if 'vmx' in contents or 'svm' in contents:
            config['hwvirtex'] = 'on'

    serverdir = os.path.join(os.getcwd(), 'buildserver')
    logfilename = os.path.join(serverdir, 'up.log')
    if not os.path.exists(logfilename):
        open(logfilename, 'a').close()  # create blank file
    log_cm = vagrant.make_file_cm(logfilename)
    v = vagrant.Vagrant(root=serverdir, out_cm=log_cm, err_cm=log_cm)

    if options.verbose:
        tail = fdroidserver.tail.Tail(logfilename)
        tail.start()

    if options.clean:
        destroy_current_image(v, serverdir)

    # Check against the existing Vagrantfile.yaml, and if they differ, we
    # need to create a new box:
    vf = os.path.join(serverdir, 'Vagrantfile.yaml')
    writevf = True
    if os.path.exists(vf):
        print('Halting', serverdir)
        v.halt()
        with open(vf, 'r', encoding='utf-8') as f:
            oldconfig = yaml.load(f)
        if config != oldconfig:
            print("Server configuration has changed, rebuild from scratch is required")
            destroy_current_image(v, serverdir)
        else:
            print("Re-provisioning existing server")
            writevf = False
    else:
        print("No existing server - building from scratch")
    if writevf:
        with open(vf, 'w', encoding='utf-8') as f:
            yaml.dump(config, f)

    if config['vm_provider'] == 'libvirt':
        found_basebox = False
        needs_mutate = False
        for box in v.box_list():
            if box.name == config['basebox']:
                found_basebox = True
                if box.provider != 'libvirt':
                    needs_mutate = True
                continue
        if not found_basebox:
            if isinstance(config['baseboxurl'], str):
                baseboxurl = config['baseboxurl']
            else:
                baseboxurl = config['baseboxurl'][0]
            print('Adding', config['basebox'], 'from', baseboxurl)
            v.box_add(config['basebox'], baseboxurl)
            needs_mutate = True
        if needs_mutate:
            print('Converting', config['basebox'], 'to libvirt format')
            v._call_vagrant_command(['mutate', config['basebox'], 'libvirt'])
            print('Removing virtualbox format copy of', config['basebox'])
            v.box_remove(config['basebox'], 'virtualbox')

    print("Configuring build server VM")
    v.up(provision=True)

    if config['copy_caches_from_host']:
        ssh_config = v.ssh_config()
        user = re.search(r'User ([^ \n]+)', ssh_config).group(1)
        hostname = re.search(r'HostName ([^ \n]+)', ssh_config).group(1)
        port = re.search(r'Port ([0-9]+)', ssh_config).group(1)
        key = re.search(r'IdentityFile ([^ \n]+)', ssh_config).group(1)

        for d in ('.m2', '.gradle/caches', '.gradle/wrapper', '.pip_download_cache'):
            fullpath = os.path.join(os.getenv('HOME'), d)
            if os.path.isdir(fullpath):
                # TODO newer versions of vagrant provide `vagrant rsync`
                run_via_vagrant_ssh(v, ['cd ~ && test -d', d, '|| mkdir -p', d])
                subprocess.call(['rsync', '-axv', '--progress', '--delete', '-e',
                                 'ssh -i {0} -p {1} -oIdentitiesOnly=yes'.format(key, port),
                                 fullpath + '/',
                                 user + '@' + hostname + ':~/' + d + '/'])

        # this file changes every time but should not be cached
        run_via_vagrant_ssh(v, ['rm', '-f', '~/.gradle/caches/modules-2/modules-2.lock'])
        run_via_vagrant_ssh(v, ['rm', '-fr', '~/.gradle/caches/*/plugin-resolution/'])

    print("Writing buildserver ID")
    p = subprocess.Popen(['git', 'rev-parse', 'HEAD'], stdout=subprocess.PIPE,
                         universal_newlines=True)
    buildserverid = p.communicate()[0].strip()
    print("...ID is " + buildserverid)
    run_via_vagrant_ssh(v, 'sh -c "echo %s >/home/vagrant/buildserverid"' % buildserverid)

    print("Stopping build server VM")
    v.halt()

    print("Packaging")
    boxfile = os.path.join(os.getcwd(), 'buildserver.box')
    if os.path.exists(boxfile):
        os.remove(boxfile)

    if config['vm_provider'] == 'libvirt':
        kvm_package(boxfile)
    else:
        v.package(output=boxfile)

    print("Adding box")
    v.box_add('buildserver', boxfile, force=True)

    os.remove(boxfile)


if __name__ == '__main__':
    try:
        main()
    finally:
        if tail is not None:
            tail.stop()