164 lines
5 KiB
Python
164 lines
5 KiB
Python
import argparse
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import math
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import json
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import requests
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import sys
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from enum import Enum
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from libversion import Version
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from typing import (
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Callable,
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Iterable,
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List,
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NamedTuple,
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Optional,
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Tuple,
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TypeVar,
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Type,
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cast,
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)
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EnumValue = TypeVar("EnumValue", bound=Enum)
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def enum_to_arg(enum: Enum) -> str:
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return enum.name.lower().replace("_", "-")
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def arg_to_enum(enum_meta: Type[EnumValue], name: str) -> EnumValue:
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return enum_meta[name.upper().replace("-", "_")]
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def enum_to_arg_choices(enum_meta: Type[EnumValue]) -> Tuple[str, ...]:
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return tuple(enum_to_arg(v) for v in cast(Iterable[EnumValue], enum_meta))
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class Stability(Enum):
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STABLE = "stable"
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UNSTABLE = "unstable"
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VersionPolicy = Callable[[Version], bool]
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VersionPredicate = Callable[[Version, Stability], bool]
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class VersionPredicateHolder(NamedTuple):
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function: VersionPredicate
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def version_to_list(version: str) -> List[int]:
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return list(map(int, version.split(".")))
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def odd_unstable(version: Version, selected: Stability) -> bool:
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try:
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version_parts = version_to_list(version.value)
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except:
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# Failing to parse as a list of numbers likely means the version contains a string tag like “beta”, therefore it is not a stable release.
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return selected != Stability.STABLE
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if len(version_parts) < 2:
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return True
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even = version_parts[1] % 2 == 0
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prerelease = (version_parts[1] >= 90 and version_parts[1] < 100) or (version_parts[1] >= 900 and version_parts[1] < 1000)
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stable = even and not prerelease
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if selected == Stability.STABLE:
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return stable
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else:
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return True
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def tagged(version: Version, selected: Stability) -> bool:
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if selected == Stability.STABLE:
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return not ("alpha" in version.value or "beta" in version.value or "rc" in version.value)
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else:
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return True
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def no_policy(version: Version, selected: Stability) -> bool:
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return True
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class VersionPolicyKind(Enum):
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# HACK: Using function as values directly would make Enum
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# think they are methods and skip them.
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ODD_UNSTABLE = VersionPredicateHolder(odd_unstable)
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TAGGED = VersionPredicateHolder(tagged)
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NONE = VersionPredicateHolder(no_policy)
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def make_version_policy(
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version_policy_kind: VersionPolicyKind,
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selected: Stability,
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upper_bound: Optional[Version],
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) -> VersionPolicy:
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version_predicate = version_policy_kind.value.function
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if not upper_bound:
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return lambda version: version_predicate(version, selected)
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else:
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return lambda version: version_predicate(version, selected) and version < upper_bound
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def find_versions(package_name: str, version_policy: VersionPolicy) -> List[Version]:
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# The structure of cache.json: https://gitlab.gnome.org/Infrastructure/sysadmin-bin/blob/master/ftpadmin#L762
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cache = json.loads(requests.get(f"https://ftp.gnome.org/pub/GNOME/sources/{package_name}/cache.json").text)
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if type(cache) != list or cache[0] != 4:
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raise Exception("Unknown format of cache.json file.")
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versions: Iterable[Version] = map(Version, cache[2][package_name])
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versions = sorted(filter(version_policy, versions))
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return versions
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parser = argparse.ArgumentParser(
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description="Find latest version for a GNOME package by crawling their release server.",
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)
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parser.add_argument(
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"package-name",
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help="Name of the directory in https://ftp.gnome.org/pub/GNOME/sources/ containing the package.",
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)
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parser.add_argument(
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"version-policy",
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help="Policy determining which versions are considered stable. GNOME packages usually denote stability by alpha/beta/rc tag in the version. For older packages, odd minor versions are unstable but there are exceptions.",
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choices=enum_to_arg_choices(VersionPolicyKind),
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nargs="?",
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default=enum_to_arg(VersionPolicyKind.TAGGED),
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)
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parser.add_argument(
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"requested-release",
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help="Most of the time, we will want to update to stable version but sometimes it is useful to test.",
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choices=enum_to_arg_choices(Stability),
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nargs="?",
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default=enum_to_arg(Stability.STABLE),
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)
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parser.add_argument(
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"--upper-bound",
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dest="upper-bound",
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help="Only look for versions older than this one (useful for pinning dependencies).",
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)
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if __name__ == "__main__":
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args = parser.parse_args()
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package_name = getattr(args, "package-name")
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requested_release = arg_to_enum(Stability, getattr(args, "requested-release"))
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upper_bound = getattr(args, "upper-bound")
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if upper_bound is not None:
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upper_bound = Version(upper_bound)
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version_policy_kind = arg_to_enum(VersionPolicyKind, getattr(args, "version-policy"))
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version_policy = make_version_policy(version_policy_kind, requested_release, upper_bound)
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try:
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versions = find_versions(package_name, version_policy)
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except Exception as error:
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print(error, file=sys.stderr)
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sys.exit(1)
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if len(versions) == 0:
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print("No versions matched.", file=sys.stderr)
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sys.exit(1)
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print(versions[-1].value)
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