Sith/core/management/commands/check_front.py

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import re
from subprocess import PIPE, Popen, TimeoutExpired
from django.conf import settings
from django.core.management.base import BaseCommand
# see https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
# added "v?"
semver_regex = re.compile(
"""^v?(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"""
)
class Command(BaseCommand):
help = "Checks the front dependencies are up to date."
def handle(self, *args, **options):
deps = settings.SITH_FRONT_DEP_VERSIONS
processes = dict(
(url, create_process(url))
for url in deps.keys()
if parse_semver(deps[url]) is not None
)
for url, process in processes.items():
try:
stdout, stderr = process.communicate(timeout=15)
except TimeoutExpired:
process.kill()
self.stderr.write(self.style.WARNING("{}: timeout".format(url)))
continue
# error, notice, warning
stdout = stdout.decode("utf-8")
stderr = stderr.decode("utf-8")
if stderr != "":
self.stderr.write(self.style.WARNING(stderr.strip()))
continue
# get all tags, parse them as semvers and find the biggest
tags = list_tags(stdout)
tags = map(parse_semver, tags)
tags = filter(lambda tag: tag is not None, tags)
latest_version = max(tags)
# cannot fail as those which fail are filtered in the processes dict creation
current_version = parse_semver(deps[url])
assert current_version is not None
if latest_version == current_version:
msg = "{}: {}".format(url, semver_to_s(current_version))
self.stdout.write(self.style.SUCCESS(msg))
else:
msg = "{}: {} < {}".format(
url, semver_to_s(current_version), semver_to_s(latest_version)
)
self.stdout.write(self.style.ERROR(msg))
def create_process(url):
"""Spawn a "git ls-remote --tags" child process."""
return Popen(["git", "ls-remote", "--tags", url], stdout=PIPE, stderr=PIPE)
def list_tags(s):
"""Parses "git ls-remote --tags" output. Takes a string."""
tag_prefix = "refs/tags/"
for line in s.strip().split("\n"):
# an example line could be:
# "1f41e2293f9c3c1962d2d97afa666207b98a222a\trefs/tags/foo"
parts = line.split("\t")
# check we have a commit ID (SHA-1 hash) and a tag name
assert len(parts) == 2
assert len(parts[0]) == 40
assert parts[1].startswith(tag_prefix)
# avoid duplicates (a peeled tag will appear twice: as "name" and as "name^{}")
if not parts[1].endswith("^{}"):
yield parts[1][len(tag_prefix) :]
def parse_semver(s):
"""
Turns a semver string into a 3-tuple or None if the parsing failed, it is a
prerelease or it has build metadata.
See https://semver.org
"""
m = semver_regex.match(s)
if (
m is None
or m.group("prerelease") is not None
or m.group("buildmetadata") is not None
):
return None
return (int(m.group("major")), int(m.group("minor")), int(m.group("patch")))
def semver_to_s(t):
"""Expects a 3-tuple with ints and turns it into a string of type "1.2.3"."""
return "{}.{}.{}".format(t[0], t[1], t[2])