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#! /usr/bin/env nix-shell
#! nix-shell -p nix-prefetch-git "python3.withPackages (ps: with ps; [ lxml ])"
#! nix-shell -i python
import base64
import json
import re
import subprocess
from codecs import iterdecode
from os.path import dirname, splitext
from lxml import etree
from lxml.etree import HTMLParser
from urllib.request import urlopen
# ChromiumOS components required to build crosvm.
components = ['chromiumos/platform/crosvm', 'chromiumos/third_party/adhd']
git_root = 'https://chromium.googlesource.com/'
manifest_versions = f'{git_root}chromiumos/manifest-versions'
buildspecs_url = f'{manifest_versions}/+/refs/heads/master/full/buildspecs/'
# CrOS version numbers look like this:
# [<chrome-major-version>.]<tip-build>.<branch-build>.<branch-branch-build>
#
# As far as I can tell, branches are where internal Google
# modifications are added to turn Chromium OS into Chrome OS, and
# branch branches are used for fixes for specific devices. So for
# Chromium OS they will always be 0. This is a best guess, and is not
# documented.
with urlopen('https://cros-updates-serving.appspot.com/') as resp:
document = etree.parse(resp, HTMLParser())
# bgcolor="lightgreen" is set on the most up-to-date version for
# each channel, so find a lightgreen cell in the "Stable" column.
(platform_version, chrome_version) = document.xpath("""
(//table[@id="cros-updates"]/tr/td[1 + count(
//table[@id="cros-updates"]/thead/tr[1]/th[text() = "Stable"]
/preceding-sibling::*)
][@bgcolor="lightgreen"])[1]/text()
""")
chrome_major_version = re.match(r'\d+', chrome_version)[0]
chromeos_tip_build = re.match(r'\d+', platform_version)[0]
# Find the most recent buildspec for the stable Chrome version and
# Chromium OS build number. Its branch build and branch branch build
# numbers will (almost?) certainly be 0. It will then end with an rc
# number -- presumably these are release candidates, one of which
# becomes the final release. Presumably the one with the highest rc
# number.
with urlopen(f'{buildspecs_url}{chrome_major_version}/?format=TEXT') as resp:
listing = base64.decodebytes(resp.read()).decode('utf-8')
buildspecs = [(line.split('\t', 1)[1]) for line in listing.splitlines()]
buildspecs = [s for s in buildspecs if s.startswith(chromeos_tip_build)]
buildspecs.sort(reverse=True)
buildspec = splitext(buildspecs[0])[0]
revisions = {}
# Read the buildspec, and extract the git revisions for each component.
with urlopen(f'{buildspecs_url}{chrome_major_version}/{buildspec}.xml?format=TEXT') as resp:
xml = base64.decodebytes(resp.read())
root = etree.fromstring(xml)
for project in root.findall('project'):
revisions[project.get('name')] = project.get('revision')
# Initialize the data that will be output from this script. Leave the
# rc number in buildspec so nobody else is subject to the same level
# of confusion I have been.
data = {'version': f'{chrome_major_version}.{buildspec}', 'components': {}}
# Fill in the 'components' dictionary with the output from
# nix-prefetch-git, which can be passed straight to fetchGit when
# imported by Nix.
for component in components:
argv = ['nix-prefetch-git',
'--url', git_root + component,
'--rev', revisions[component]]
output = subprocess.check_output(argv)
data['components'][component] = json.loads(output.decode('utf-8'))
# Find the path to crosvm's default.nix, so the srcs data can be
# written into the same directory.
argv = ['nix-instantiate', '--eval', '--json', '-A', 'crosvm.meta.position']
position = json.loads(subprocess.check_output(argv).decode('utf-8'))
filename = re.match(r'[^:]*', position)[0]
# Finally, write the output.
with open(dirname(filename) + '/upstream-info.json', 'w') as out:
json.dump(data, out, indent=2)
out.write('\n')
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