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import argparse
import math
import json
import requests
import sys
def version_to_list(version):
return list(map(int, version.split(".")))
def odd_unstable(version_str, selected):
version = version_to_list(version_str)
if len(version) < 2:
return True
even = version[1] % 2 == 0
prerelease = (version[1] >= 90 and version[1] < 100) or (version[1] >= 900 and version[1] < 1000)
stable = even and not prerelease
if selected == "stable":
return stable
else:
return True
def no_policy(version, selected):
return True
version_policies = {
"odd-unstable": odd_unstable,
"none": no_policy,
}
def make_version_policy(version_predicate, selected, upper_bound):
if not upper_bound:
upper_bound = [math.inf, math.inf]
else:
upper_bound = version_to_list(upper_bound)
return lambda version: version_predicate(version, selected) and version_to_list(version) < upper_bound
parser = argparse.ArgumentParser(description="Find latest version for a GNOME package by crawling their release server.")
parser.add_argument("package-name", help="Name of the directory in https://ftp.gnome.org/pub/GNOME/sources/ containing the package.")
parser.add_argument("version-policy", help="Policy determining which versions are considered stable. For most GNOME packages, odd minor versions are unstable but there are exceptions.", choices=version_policies.keys(), nargs="?", default="odd-unstable")
parser.add_argument("requested-release", help="Most of the time, we will want to update to stable version but sometimes it is useful to test.", choices=["stable", "unstable"], nargs="?", default="stable")
parser.add_argument("--upper-bound", dest="upper-bound", help="Only look for versions older than this one (useful for pinning dependencies).")
if __name__ == "__main__":
args = parser.parse_args()
package_name = getattr(args, "package-name")
requested_release = getattr(args, "requested-release")
upper_bound = getattr(args, "upper-bound")
version_predicate = version_policies[getattr(args, "version-policy")]
version_policy = make_version_policy(version_predicate, requested_release, upper_bound)
# The structure of cache.json: https://gitlab.gnome.org/Infrastructure/sysadmin-bin/blob/master/ftpadmin#L762
cache = json.loads(requests.get(f"https://ftp.gnome.org/pub/GNOME/sources/{package_name}/cache.json").text)
if type(cache) != list or cache[0] != 4:
print("Unknown format of cache.json file.", file=sys.stderr)
sys.exit(1)
versions = cache[2][package_name]
versions = sorted(filter(version_policy, versions), key=version_to_list)
if len(versions) == 0:
print("No versions matched.", file=sys.stderr)
sys.exit(1)
print(versions[-1])
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