Merge pull request #47 from kiwix/custom_app

Add script to build customapp
This commit is contained in:
Matthieu Gautier 2017-06-25 16:43:49 +02:00 committed by GitHub
commit 6026daf3dd
12 changed files with 577 additions and 45 deletions

415
build_custom_app.py Executable file
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@ -0,0 +1,415 @@
#!/usr/bin/env python3
import \
argparse, \
datetime, \
glob, \
json, \
os, \
ssl, \
sys, \
tempfile, \
time, \
urllib
from uuid import uuid4
from contextlib import contextmanager
from urllib.parse import urlparse
from utils import (
Remotefile,
download_remote
)
import requests
import httplib2
from apiclient.discovery import build
from apiclient.errors import HttpError
from oauth2client import client
from oauth2client.service_account import ServiceAccountCredentials
tmpl_request_url = "https://api.travis-ci.org/repo/{organisation}%2F{repository}/{endpoint}"
tmpl_message = """Build of custom app {app} with zim file {zim}.
UUID:#{uuid}#"""
description = """Launch a custom application build.
This command will launch a custom application build on Travis-CI.
Travis-CI jobs will compile the application and upload the build apks on
google play, using tha 'alpha' track of the application.
You will need to have a valid TRAVIS_TOKEN associated to your personnal account
and the kiwix-build repository on travis.
Use the 'travis' command line tool (https://github.com/travis-ci/travis.rb)
to generate a token.
"""
def parse_args():
parser = argparse.ArgumentParser(description=description,
formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument('--custom-app')
parser.add_argument('--travis-token')
advance = parser.add_argument_group('advance', "Some advanced options.")
advance.add_argument('--extra-code', type=int, default=0)
advance.add_argument('--check-certificate', default=True)
advance.add_argument('--zim-url', default=None)
advance.add_argument('--no-android-upload', action='store_false', dest='android_upload')
# Hidden options
parser.add_argument('--step', default='launch', choices=['launch', 'publish'], help=argparse.SUPPRESS)
parser.add_argument('--apks-dir', help=argparse.SUPPRESS)
parser.add_argument('--version', default="0", help=argparse.SUPPRESS)
parser.add_argument('--content-version-code', type=int)
parser.add_argument('--package-name', default=None, help=argparse.SUPPRESS)
parser.add_argument('--google-api-key', help=argparse.SUPPRESS)
options = parser.parse_args()
if not options.package_name or not options.zim_url:
if not options.package_name:
print("Try to get package name from info.json file")
if not options.zim_url:
print("Try to get zim url from info.json file")
request_url = ('https://raw.githubusercontent.com/kiwix/kiwix-android-custom/master/{}/info.json'
.format(options.custom_app))
json_request = requests.get(request_url)
if json_request.status_code != 200:
print("Error while getting json file.")
print("Reason is '{}'".format(json_request.reason))
sys.exit(-1)
json_data = json.loads(json_request.text)
if not options.package_name:
print("Found package_name '{}'".format(json_data['package']))
options.package_name = json_data['package']
if not options.zim_url:
print("Found zim_url '{}'".format(json_data['zim_url']))
options.zim_url = json_data['zim_url']
options.base_version = "{}{}".format(
datetime.date.today().strftime('%y%j'),
options.extra_code)
return options
def download_zim_file(zim_url, dest_dir=None):
if dest_dir is None:
dest_dir = os.getcwd()
out_filename = urlparse(zim_url).path
out_filename = os.path.basename(out_filename)
zim_file = Remotefile(out_filename, '', zim_url)
download_remote(zim_file, dest_dir)
return os.path.join(dest_dir, out_filename)
def get_zim_size(zim_url, check_certificate=True):
print("Try to get zim size")
if not check_certificate:
context = ssl.create_default_context()
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
else:
context = None
extra_args = {'context':context} if sys.version_info >= (3, 4, 3) else {}
with urllib.request.urlopen(zim_url, **extra_args) as resource:
size = resource.getheader('Content-Length', None)
if size is not None:
size = int(size)
print("Zim size is {}".format(size))
return size
else:
print("No 'Content-Length' header in http answer from the server.\n"
"We need to download the zim file to get its size.")
zim_path = download_zim_file(zim_url, tempfile.gettempdir())
size = os.path.getsize(zim_path)
print("Zim size is {}".format(size))
return size
def do_launch(options):
zim_size = get_zim_size(options.zim_url, options.check_certificate)
travis_launch_build('kiwix', 'kiwix-build', options, zim_size)
print("Travis build has been launch.")
def do_publish(options):
zim_path = download_zim_file(options.zim_url)
googleService = Google(options)
with googleService.new_request():
versionCodes = []
for apk in glob.iglob(options.apks_dir+"/*.apk"):
result = googleService.upload_apk(apk)
versionCodes.append(result['versionCode'])
googleService.upload_expansionfile(
zim_path, options.content_version_code, versionCodes)
googleService.publish_release(options, versionCodes)
def travis_launch_build(organisation, repository, options, zim_size):
request_url = tmpl_request_url.format(
organisation=organisation,
repository=repository,
endpoint='requests')
headers = {
"Travis-API-Version": "3",
"Content-Type": "application/json",
"Authorization": "token {}".format(options.travis_token),
"User-Agent": "kiwix-build"
}
uuid = uuid4()
envs = []
for platform_index, platform in enumerate(['arm', 'arm64', 'x86', 'x86_64', 'mips', 'mips64']):
d = {
'PLATFORM': "android_{}".format(platform),
'VERSION_CODE': gen_version_code(platform_index, options.base_version)
}
envs.append(d)
global_env = [
{ 'CUSTOM_APP': options.custom_app},
{ 'ZIM_FILE_SIZE': zim_size},
{ 'PACKAGE_NAME': options.package_name},
{ 'ZIM_URL': options.zim_url},
{ 'EXTRA_CODE': options.extra_code},
{ 'CONTENT_VERSION_CODE': gen_version_code(0, options.base_version)},
{ 'VERSION': options.version},
# google_key
{ 'secure': ('VAgKBMx0KEIyJlSnpM4YrHKLALIbaibkhlsgiv19ITa6dODoEIqeYHz'
'wFTiL3mRHU6HwtXtdNb/JeMle9NfHJVFSV56ZgFzX7ev9zr0YG0qZQv'
'tl8vHQlFPBErARder/L2tblOTM194/TiJk/q89a0XWDanKswXExwjcW'
'Z0tnDYQXTHSAKEt+xW8hjbnhqqB/v16lX6dUjZI+sVlsw+qAM4VT/qf'
'FCyDO5eJCzWIEL2LDUWI7jKSETNih5hl5fMMvCCNRPnkgGnytw5kF/t'
'Lw8YAbLRxkGsO4FCx5mB7HF5pNHyWOCCalMTKheyg/qUV/VcXW9Unlr'
'puMu0+d3hpLZESplS/NkvDxSrx16ank7EORS8OxLOufu56TW2hDuBzz'
'w1CBAj1p6s+Z6Kc4RMYYdxRgR1TjXg/ZVUn3T69d9igdS/5lAPFx2Ww'
'8x82FWCLSaiXymxXRNsNcKx5ifuvtv307r4yh31QjlKFYwadOCaCHHZ'
'zGE1mXcOu3j6W9WIaZfYRTpxmOrcfDIHxZSdLf11hOSZEUUFpj9hQlV'
'Op0RHkDEJUMNs6vkXUhZq9yPuqgrcb6GaN+UhOT8iHlijKmlG8NJEPk'
'Hp8RnL1hsr44N57ZzLqmSUZtvC83u/5e+YUb7beUDGsMyJV/fcMiGMM'
'LVtRnuPCFyNVNQUf2CphtG0=') },
# pass
{ 'secure': ('AtbgKUukES2uJPpEWNEDHLg0WcghLlCGL171Ah3+4CckBI8y1Fn+VpH'
'U2vEXzsV8tKoxX1IyB2tFivzuyo6CQXHSuWGJYQexwkBeGCgOfzKJLj'
'MAy75ATYA6JnFrikV+UcqdEz/9Dow3J1K7Slp3jpsQhERHbNeqkr4I+'
'XCL1LLnpewfOZo9OIEu93p6b6YlqvIPXJHyQe5xnMd8jFWg3/uIYqFn'
'XPvigeZqC2lhNp48mj4JdwwF2tmiArgyXOmgxiuHJNVVI7okbhc7kmI'
'Y3MmCSFgG0XPUEBU3Kdr4o/2hy8DDP6Gff+rUZW8nPI/2UWXRLWtOxv'
'XGGRyjHHTxGWzI4JyZbli9dls5M32MMjsXVKtciSFVwsMM8qn7wFnRi'
'q248a1Sg5fDNX/WYowmsHlWjffHZ7+UqUqJxAKtZ0vpQL+4SPIALPnK'
'V6j6CoorQp+VhMF01EFlZ0c8bkNmk4YW7R7RyNLIcaHKfd1ud8QF9PD'
'AnQ7Jr1GRBxzkjHvHfFrE14WPUu+FjVvDO7UPVMNQX7RS1IVACpKSRu'
'7N8KnIK3vSnLpn5GXKsbx0JB2vtyoTaFZvC9c3qyAw1nlpn7Lp3sPs3'
'bgIBU4tWOzg5g46eHbc4ad5nyB9Soz715lbMdECvKs2HHJUG3tubLKj'
'L0S/LRGRQ+IDgC7xrjQj8aA=') },
]
env = {
'matrix': envs,
'global': global_env
}
data = {
'request': {
'message' : tmpl_message.format(app=options.custom_app, zim=options.zim_url, uuid=uuid),
'branch' : "custom_app",
'config' : {
'before_install' : [
( 'pip3 install pyOpenSSl google-api-python-client'
' httplib2 apiclient requests'),
( 'openssl aes-256-cbc -k $google_key'
' -in travis/googleplay_android_developer-5a411156212c.json.enc'
' -out travis/googleplay_android_developer-5a411156212c.json'
' -d'),
( 'openssl aes-256-cbc -k $google_key'
' -in travis/kiwix-android.keystore.enc'
' -out travis/kiwix-android.keystore -d'),
( 'openssl aes-256-cbc -K $encrypted_eba2f7543984_key'
' -iv $encrypted_eba2f7543984_iv'
' -in travis/travisci_builder_id_key.enc'
' -out travis/travisci_builder_id_key -d'),
'chmod 600 travis/travisci_builder_id_key'
],
'env' : env,
'script' : 'travis_wait 30 travis/compile_custom_app.sh',
'deploy' : {
'provider': 'script',
'skip_cleanup': True,
'script': 'travis/deploy_apk.sh',
'on': {
'branch': 'custom_app'
}
}
}
}
}
if options.android_upload:
data['request']['config']['jobs'] = {
'include': [
{
'stage' : 'make_release',
'install': 'pip3 install -r requirements_build_custom_app.txt',
'script': True,
'env': global_env,
'deploy' : {
'provider': 'script',
'skip_cleanup': True,
'script': 'travis/make_release.sh',
'on': {
'branch': 'custom_app'
}
}
}
]
}
global_env.append({
'DEPLOY_DIR' : '/home/nightlybot/apks/{}_{}'.format(
options.custom_app, options.base_version)
})
else:
global_env.append({
'DEPLOY_DIR' : '/var/www/tmp.kiwix.org/custom_apps/{}_{}'.format(
options.custom_app, options.base_version)
})
r = requests.post(request_url, headers=headers, json=data)
if r.status_code != 202:
print("Error while requesting build:")
print(r.reason)
print("Have you forget to give the travis token ?")
sys.exit(-1)
else:
request_id = r.json()['request']['id']
print("Request {} has been schedule.".format(request_id))
request_left = 10
found = False
request_url = tmpl_request_url.format(
organisation=organisation,
repository=repository,
endpoint='builds')
while request_left:
time.sleep(1)
print("Try to get associated build.")
r = requests.get(request_url, headers=headers)
json_data = json.loads(r.text)
for build in json_data['builds']:
if build['event_type'] != 'api':
continue
message = build['commit']['message']
if str(uuid) in message:
found = True
break
if found:
break
print("Cannot find build. Wait 1 second and try again")
print("{} tries left".format(request_left))
request_left -= 1
if found:
print("Associated build found: {}.".format(build['number']))
print("https://travis-ci.org/kiwix/kiwix-build/builds/{}".format(build['id']))
else:
print("Request has been accepted by travis-ci but I cannot found "
"the associated build. Have a look here "
"https://travis-ci.org/kiwix/kiwix-build/builds"
"if you found it.")
if not options.android_upload:
print(("Automatic upload to android play store has been deactivated.\n"
"You will find the apks at this address once they have been compiled :"
" http://tmp.kiwix.org/custom_apps/{}_{}").format(
options.custom_app, options.base_version))
ERROR_MSG_EDIT_CHANGE = "A change was made to the application outside of this Edit, please create a new edit."
class Google:
def __init__(self, options):
scope = 'https://www.googleapis.com/auth/androidpublisher'
key = options.google_api_key
credentials = ServiceAccountCredentials.from_json_keyfile_name(
key,
scopes=[scope])
http = httplib2.Http()
http = credentials.authorize(http)
self.service = build('androidpublisher', 'v2', http=http)
self.packageName = options.package_name
self.edit_id = None
@contextmanager
def new_request(self):
edit_request = self.service.edits().insert(
packageName=self.packageName,
body={})
result = edit_request.execute()
print("create", result)
self.edit_id = result['id']
yield
commit_request = self.service.edits().commit(
editId=self.edit_id,
packageName=self.packageName)
result = commit_request.execute()
print("commit", result)
self.edit_id = None
def make_request(self, section, method, **kwargs):
request_content = self._build_request_content(kwargs)
_section = getattr(self._edits, section)()
_method = getattr(_section, method)
print(">", request_content)
request = _method(**request_content)
result = request.execute()
print("<", result)
return result
def _build_request_content(self, kwargs):
d = kwargs.copy()
d['editId'] = self.edit_id
d['packageName'] = self.packageName
return d
@property
def _edits(self):
return self.service.edits()
def upload_expansionfile(self, comp_file, contentVersionCode, versionCodes):
versionCodes = [int(v) for v in versionCodes]
self.make_request('expansionfiles', 'upload',
expansionFileType='main',
apkVersionCode=contentVersionCode,
media_body=comp_file,
media_mime_type='application/octet-stream')
for versionCode in versionCodes:
if versionCode == contentVersionCode:
continue
self.make_request('expansionfiles', 'update',
expansionFileType='main',
apkVersionCode=versionCode,
body={'referencesVersion': contentVersionCode}
)
def upload_apk(self, apk_file):
return self.make_request('apks', 'upload',
media_body=apk_file)
def publish_release(self, options, versionCodes):
return self.make_request('tracks', 'update',
track="alpha",
body={'versionCodes': versionCodes})
def gen_version_code(platform_index, base_version):
str_version = "{platform}{base_version}".format(
platform=platform_index,
base_version=base_version
)
return int(str_version)
if __name__ == "__main__":
options = parse_args()
func = globals()['do_{}'.format(options.step)]
func(options)

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@ -345,6 +345,12 @@ class KiwixAndroid(Dependency):
git_dir = "kiwix-android"
class Builder(GradleBuilder):
def build(self):
if self.buildEnv.options.targets == 'kiwix-android-custom':
print("SKIP")
else:
super().build()
def _configure(self, context):
if not os.path.exists(self.build_path):
shutil.copytree(self.source_path, self.build_path)
@ -375,7 +381,15 @@ class KiwixCustomApp(Dependency):
@property
def gradle_option(self):
return "-i -P customDir={}".format(pj(self.build_path, 'custom'))
template = ("-i -P customDir={customDir}"
" -P zim_file_size={zim_size}"
" -P version_code={version_code}"
" -P content_version_code={content_version_code}")
return template.format(
customDir=pj(self.build_path, 'custom'),
zim_size=self._get_zim_size(),
version_code=os.environ['VERSION_CODE'],
content_version_code=os.environ['CONTENT_VERSION_CODE'])
@property
def build_path(self):
@ -385,6 +399,15 @@ class KiwixCustomApp(Dependency):
def custom_build_path(self):
return pj(self.build_path, 'custom', self.target.custom_name)
def _get_zim_size(self):
try:
zim_size = self.buildEnv.options.zim_file_size
except AttributeError:
with open(pj(self.source_path, self.target.custom_name, 'info.json')) as f:
app_info = json.load(f)
zim_size = os.path.getsize(pj(self.custom_build_path, app_info['zim_file']))
return zim_size
def build(self):
self.command('configure', self._configure)
self.command('download_zim', self._download_zim)

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@ -135,12 +135,15 @@ class GitClone(Source):
context.force_native_build = True
if os.path.exists(self.git_path):
raise SkipCommand()
command = "git clone --depth=1 {} {}".format(self.git_remote, self.git_dir)
command = "git clone --depth=1 --branch {} {} {}".format(
self.git_ref, self.git_remote, self.git_dir)
self.buildEnv.run_command(command, self.buildEnv.source_dir, context)
def _git_update(self, context):
context.force_native_build = True
self.buildEnv.run_command("git fetch", self.git_path, context)
command = "git fetch origin {}".format(
self.git_ref)
self.buildEnv.run_command(command, self.git_path, context)
self.buildEnv.run_command("git checkout "+self.git_ref, self.git_path, context)
def prepare(self):

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@ -17,6 +17,7 @@ from utils import (
get_sha256,
print_progress,
setup_print_progress,
download_remote,
StopBuild,
SkipCommand,
Defaultdict,
@ -432,44 +433,7 @@ class BuildEnv:
def download(self, what, where=None):
where = where or self.archive_dir
file_path = pj(where, what.name)
file_url = what.url or (REMOTE_PREFIX + what.name)
if os.path.exists(file_path):
if what.sha256 == get_sha256(file_path):
raise SkipCommand()
os.remove(file_path)
if options.no_cert_check == True:
context = ssl.create_default_context()
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
else:
context = None
batch_size = 1024 * 8
extra_args = {'context':context} if sys.version_info >= (3, 4, 3) else {}
progress_chars = "/-\|"
with urllib.request.urlopen(file_url, **extra_args) as resource, open(file_path, 'wb') as file:
tsize = resource.getheader('Content-Length', None)
if tsize is not None:
tsize = int(tsize)
current = 0
while True:
batch = resource.read(batch_size)
if not batch:
break
if tsize:
current += batch_size
print_progress("{:.2%}".format(current/tsize))
else:
print_progress(progress_chars[current])
current = (current+1)%4
file.write(batch)
if not what.sha256:
print('Sha256 for {} not set, do no verify download'.format(what.name))
elif what.sha256 != get_sha256(file_path):
os.remove(file_path)
raise StopBuild()
download_remote(what, where, not self.options.no_cert_check)
def install_packages(self):
autoskip_file = pj(self.build_dir, ".install_packages_ok")
@ -945,12 +909,21 @@ def parse_args():
help="The custom android app to build")
subgroup.add_argument('--zim-file-url',
help="The url of the zim file to download")
subgroup.add_argument('--zim-file-size',
help="The size of the zim file.")
options = parser.parse_args()
if options.targets == 'kiwix-android-custom':
if not options.android_custom_app or not options.zim_file_url:
print("You need to specify ANDROID_CUSTOM_APP and ZIM_FILE_URL if "
err = False
if not options.android_custom_app:
print("You need to specify ANDROID_CUSTOM_APP if you "
"want to build a kiwix-android-custom target")
err = True
if not options.zim_file_url and not options.zim_file_size:
print("You need to specify ZIM_FILE_SIZE or ZIM_FILE_URL if you "
"want to build a kiwix-android-custom target")
err = True
if err:
sys.exit(1)
return options

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@ -0,0 +1,3 @@
requests==2.10.0
apiclient==1.0.3

13
travis/compile_custom_app.sh Executable file
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@ -0,0 +1,13 @@
#!/usr/bin/env bash
set -e
cd ${HOME}
${TRAVIS_BUILD_DIR}/kiwix-build.py \
--target-platform $PLATFORM \
--hide-progress \
--android-custom-app $CUSTOM_APP \
--zim-file-size $ZIM_FILE_SIZE \
kiwix-android-custom

27
travis/deploy_apk.sh Executable file
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@ -0,0 +1,27 @@
#!/usr/bin/env bash
set -e
KEYSTORE_FILE=${TRAVIS_BUILD_DIR}/travis/kiwix-android.keystore
GOOGLE_API_KEY=${TRAVIS_BUILD_DIR}/travis/googleplay_android_developer-5a411156212c.json
SSH_KEY=${TRAVIS_BUILD_DIR}/travis/travisci_builder_id_key
cd ${HOME}
# Sign apk file
BASE_DIR="BUILD_${PLATFORM}"
INPUT_APK_FILE=${BASE_DIR}/kiwix-android-custom_${CUSTOM_APP}/app/build/outputs/apk/app-${CUSTOM_APP}-release-unsigned.apk
SIGNED_APK=${BASE_DIR}/app-${CUSTOM_APP}_${VERSION_CODE}-release-signed.apk
TOOLCHAINS/android-sdk-r25.2.3/build-tools/25.0.2/apksigner sign \
--ks ${KEYSTORE_FILE} \
--ks-pass env:KEYSTORE_PASS \
--out ${SIGNED_APK} \
${INPUT_APK_FILE}
ssh -i ${SSH_KEY} nightlybot@download.kiwix.org "mkdir -p ${DEPLOY_DIR}"
scp -i ${SSH_KEY} \
${SIGNED_APK} \
nightlybot@download.kiwix.org:${DEPLOY_DIR}

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@ -5,8 +5,9 @@ set -e
orig_dir=$(pwd)
sudo apt-get update -qq
sudo apt-get install -qq python3-pip
sudo apt-get install -qq python3-pip zlib1g-dev libjpeg-dev
pip3 install meson
pip3 install pillow
# ninja
git clone git://github.com/ninja-build/ninja.git

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28
travis/make_release.sh Executable file
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@ -0,0 +1,28 @@
#!/usr/bin/env bash
set -e
KEYSTORE_FILE=${TRAVIS_BUILD_DIR}/travis/test_ks.ks
GOOGLE_API_KEY=${TRAVIS_BUILD_DIR}/travis/googleplay_android_developer-5a411156212c.json
SSH_KEY=${TRAVIS_BUILD_DIR}/travis/travisci_builder_id_key
cd ${HOME}
BASE_DIR="BUILD_${PLATFORM}"
mkdir -p ${HOME}/APKS
scp -i ${SSH_KEY} nightlybot@download.kiwix.org:${DEPLOY_DIR}/* ${HOME}/APKS
ssh -i ${SSH_KEY} nightlybot@download.kiwix.org "rm -rf ${DEPLOY_DIR}"
${TRAVIS_BUILD_DIR}/build_custom_app.py \
--step publish \
--custom-app ${CUSTOM_APP} \
--package-name ${PACKAGE_NAME} \
--google-api-key ${GOOGLE_API_KEY} \
--version ${VERSION} \
--zim-url ${ZIM_URL} \
--apks-dir ${HOME}/APKS \
--content-version-code ${CONTENT_VERSION_CODE}

View File

@ -3,13 +3,17 @@ import hashlib
import tarfile, zipfile
import tempfile
import shutil
import os, stat
import os, stat, sys
import urllib
import ssl
from collections import namedtuple, defaultdict
pj = os.path.join
g_print_progress = True
REMOTE_PREFIX = 'http://download.kiwix.org/dev/'
def setup_print_progress(print_progress):
global g_print_progress
@ -71,6 +75,48 @@ def copy_tree(src, dst, post_copy_function=None):
if post_copy_function is not None:
post_copy_function(dstfile)
def download_remote(what, where, check_certificate=True):
file_path = pj(where, what.name)
file_url = what.url or (REMOTE_PREFIX + what.name)
if os.path.exists(file_path):
if what.sha256 == get_sha256(file_path):
raise SkipCommand()
os.remove(file_path)
if not check_certificate:
context = ssl.create_default_context()
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
else:
context = None
batch_size = 1024 * 8
extra_args = {'context':context} if sys.version_info >= (3, 4, 3) else {}
progress_chars = "/-\|"
with urllib.request.urlopen(file_url, **extra_args) as resource, open(file_path, 'wb') as file:
tsize = resource.getheader('Content-Length', None)
if tsize is not None:
tsize = int(tsize)
current = 0
while True:
batch = resource.read(batch_size)
if not batch:
break
if tsize:
current += batch_size
print_progress("{:.2%}".format(current/tsize))
else:
print_progress(progress_chars[current])
current = (current+1)%4
file.write(batch)
if not what.sha256:
print('Sha256 for {} not set, do no verify download'.format(what.name))
elif what.sha256 != get_sha256(file_path):
os.remove(file_path)
raise StopBuild()
class SkipCommand(Exception):
pass