forked from mirrors/nixpkgs
1f32eb7987
Adding some abstraction makes main() more readable which is important since it's the main control flow of the script.
588 lines
18 KiB
Python
Executable file
588 lines
18 KiB
Python
Executable file
#!/usr/bin/env nix-shell
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#!nix-shell -p nix-prefetch-git -p python3 -p python3Packages.GitPython nix -i python3
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# format:
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# $ nix run nixpkgs.python3Packages.black -c black update.py
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# type-check:
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# $ nix run nixpkgs.python3Packages.mypy -c mypy update.py
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# linted:
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# $ nix run nixpkgs.python3Packages.flake8 -c flake8 --ignore E501,E265 update.py
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import argparse
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import functools
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import http
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import json
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import os
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import subprocess
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import sys
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import traceback
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import urllib.error
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import urllib.parse
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import urllib.request
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import xml.etree.ElementTree as ET
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from datetime import datetime
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from multiprocessing.dummy import Pool
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from pathlib import Path
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from typing import Dict, List, Optional, Tuple, Union, Any, Callable
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from urllib.parse import urljoin, urlparse
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from tempfile import NamedTemporaryFile
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import git
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ATOM_ENTRY = "{http://www.w3.org/2005/Atom}entry" # " vim gets confused here
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ATOM_LINK = "{http://www.w3.org/2005/Atom}link" # "
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ATOM_UPDATED = "{http://www.w3.org/2005/Atom}updated" # "
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ROOT = Path(__file__).parent
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NIXPKGS_PATH = ROOT.cwd().parents[2]
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DEFAULT_IN = ROOT.joinpath("vim-plugin-names")
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DEFAULT_OUT = ROOT.joinpath("generated.nix")
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DEPRECATED = ROOT.joinpath("deprecated.json")
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OVERRIDES = ROOT.joinpath("overrides.nix")
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import time
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from functools import wraps
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def retry(ExceptionToCheck: Any, tries: int = 4, delay: float = 3, backoff: float = 2):
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"""Retry calling the decorated function using an exponential backoff.
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http://www.saltycrane.com/blog/2009/11/trying-out-retry-decorator-python/
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original from: http://wiki.python.org/moin/PythonDecoratorLibrary#Retry
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(BSD licensed)
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:param ExceptionToCheck: the exception on which to retry
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:param tries: number of times to try (not retry) before giving up
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:param delay: initial delay between retries in seconds
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:param backoff: backoff multiplier e.g. value of 2 will double the delay
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each retry
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"""
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def deco_retry(f: Callable) -> Callable:
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@wraps(f)
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def f_retry(*args: Any, **kwargs: Any) -> Any:
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mtries, mdelay = tries, delay
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while mtries > 1:
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try:
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return f(*args, **kwargs)
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except ExceptionToCheck as e:
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print(f"{str(e)}, Retrying in {mdelay} seconds...")
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time.sleep(mdelay)
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mtries -= 1
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mdelay *= backoff
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return f(*args, **kwargs)
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return f_retry # true decorator
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return deco_retry
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class Repo:
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def __init__(self, owner: str, name: str, alias: str) -> None:
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self.owner = owner
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self.name = name
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self.alias = alias
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self.redirect: Dict[str, str] = {}
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def url(self, path: str) -> str:
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return urljoin(f"https://github.com/{self.owner}/{self.name}/", path)
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def __repr__(self) -> str:
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return f"Repo({self.owner}, {self.name})"
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@retry(urllib.error.URLError, tries=4, delay=3, backoff=2)
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def has_submodules(self) -> bool:
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try:
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urllib.request.urlopen(
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self.url("blob/master/.gitmodules"), timeout=10
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).close()
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except urllib.error.HTTPError as e:
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if e.code == 404:
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return False
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else:
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raise
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return True
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@retry(urllib.error.URLError, tries=4, delay=3, backoff=2)
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def latest_commit(self) -> Tuple[str, datetime]:
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commit_url = self.url("commits/master.atom")
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with urllib.request.urlopen(commit_url, timeout=10) as req:
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self.check_for_redirect(commit_url, req)
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xml = req.read()
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root = ET.fromstring(xml)
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latest_entry = root.find(ATOM_ENTRY)
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assert latest_entry is not None, f"No commits found in repository {self}"
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commit_link = latest_entry.find(ATOM_LINK)
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assert commit_link is not None, f"No link tag found feed entry {xml}"
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url = urlparse(commit_link.get("href"))
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updated_tag = latest_entry.find(ATOM_UPDATED)
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assert (
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updated_tag is not None and updated_tag.text is not None
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), f"No updated tag found feed entry {xml}"
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updated = datetime.strptime(updated_tag.text, "%Y-%m-%dT%H:%M:%SZ")
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return Path(str(url.path)).name, updated
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def check_for_redirect(self, url: str, req: http.client.HTTPResponse):
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response_url = req.geturl()
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if url != response_url:
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new_owner, new_name = (
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urllib.parse.urlsplit(response_url).path.strip("/").split("/")[:2]
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)
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end_line = "\n" if self.alias == "" else f" as {self.alias}\n"
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plugin_line = "{owner}/{name}" + end_line
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old_plugin = plugin_line.format(owner=self.owner, name=self.name)
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new_plugin = plugin_line.format(owner=new_owner, name=new_name)
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self.redirect[old_plugin] = new_plugin
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def prefetch_git(self, ref: str) -> str:
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data = subprocess.check_output(
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["nix-prefetch-git", "--fetch-submodules", self.url(""), ref]
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)
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return json.loads(data)["sha256"]
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def prefetch_github(self, ref: str) -> str:
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data = subprocess.check_output(
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["nix-prefetch-url", "--unpack", self.url(f"archive/{ref}.tar.gz")]
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)
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return data.strip().decode("utf-8")
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class Plugin:
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def __init__(
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self,
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name: str,
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commit: str,
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has_submodules: bool,
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sha256: str,
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date: Optional[datetime] = None,
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) -> None:
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self.name = name
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self.commit = commit
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self.has_submodules = has_submodules
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self.sha256 = sha256
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self.date = date
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@property
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def normalized_name(self) -> str:
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return self.name.replace(".", "-")
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@property
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def version(self) -> str:
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assert self.date is not None
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return self.date.strftime("%Y-%m-%d")
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def as_json(self) -> Dict[str, str]:
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copy = self.__dict__.copy()
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del copy["date"]
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return copy
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GET_PLUGINS = f"""(with import <localpkgs> {{}};
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let
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inherit (vimUtils.override {{inherit vim;}}) buildVimPluginFrom2Nix;
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generated = callPackage {ROOT}/generated.nix {{
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inherit buildVimPluginFrom2Nix;
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}};
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hasChecksum = value: lib.isAttrs value && lib.hasAttrByPath ["src" "outputHash"] value;
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getChecksum = name: value:
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if hasChecksum value then {{
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submodules = value.src.fetchSubmodules or false;
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sha256 = value.src.outputHash;
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rev = value.src.rev;
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}} else null;
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checksums = lib.mapAttrs getChecksum generated;
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in lib.filterAttrs (n: v: v != null) checksums)"""
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class CleanEnvironment(object):
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def __enter__(self) -> None:
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self.old_environ = os.environ.copy()
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local_pkgs = str(ROOT.joinpath("../../.."))
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os.environ["NIX_PATH"] = f"localpkgs={local_pkgs}"
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self.empty_config = NamedTemporaryFile()
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self.empty_config.write(b"{}")
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self.empty_config.flush()
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os.environ["NIXPKGS_CONFIG"] = self.empty_config.name
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def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
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os.environ.update(self.old_environ)
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self.empty_config.close()
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def get_current_plugins() -> List[Plugin]:
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with CleanEnvironment():
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out = subprocess.check_output(["nix", "eval", "--json", GET_PLUGINS])
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data = json.loads(out)
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plugins = []
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for name, attr in data.items():
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p = Plugin(name, attr["rev"], attr["submodules"], attr["sha256"])
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plugins.append(p)
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return plugins
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def prefetch_plugin(
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user: str, repo_name: str, alias: str, cache: "Cache" = None
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) -> Tuple[Plugin, Dict[str, str]]:
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repo = Repo(user, repo_name, alias)
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commit, date = repo.latest_commit()
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has_submodules = repo.has_submodules()
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if cache is not None:
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cached_plugin = cache[commit]
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if cached_plugin is not None:
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cached_plugin.name = alias or repo_name
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cached_plugin.date = date
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return cached_plugin, repo.redirect
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print(f"prefetch {user}/{repo_name}")
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if has_submodules:
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sha256 = repo.prefetch_git(commit)
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else:
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sha256 = repo.prefetch_github(commit)
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return (
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Plugin(alias or repo_name, commit, has_submodules, sha256, date=date),
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repo.redirect,
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)
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def print_download_error(plugin: str, ex: Exception):
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print(f"{plugin}: {ex}", file=sys.stderr)
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ex_traceback = ex.__traceback__
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tb_lines = [
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line.rstrip("\n")
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for line in traceback.format_exception(ex.__class__, ex, ex_traceback)
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]
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print("\n".join(tb_lines))
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def check_results(
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results: List[Tuple[str, str, Union[Exception, Plugin], Dict[str, str]]]
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) -> Tuple[List[Tuple[str, str, Plugin]], Dict[str, str]]:
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failures: List[Tuple[str, Exception]] = []
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plugins = []
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redirects: Dict[str, str] = {}
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for (owner, name, result, redirect) in results:
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if isinstance(result, Exception):
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failures.append((name, result))
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else:
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plugins.append((owner, name, result))
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redirects.update(redirect)
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print(f"{len(results) - len(failures)} plugins were checked", end="")
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if len(failures) == 0:
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print()
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return plugins, redirects
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else:
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print(f", {len(failures)} plugin(s) could not be downloaded:\n")
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for (plugin, exception) in failures:
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print_download_error(plugin, exception)
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sys.exit(1)
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def parse_plugin_line(line: str) -> Tuple[str, str, str]:
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name, repo = line.split("/")
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try:
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repo, alias = repo.split(" as ")
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return (name, repo, alias.strip())
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except ValueError:
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# no alias defined
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return (name, repo.strip(), "")
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def load_plugin_spec(plugin_file: str) -> List[Tuple[str, str, str]]:
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plugins = []
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with open(plugin_file) as f:
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for line in f:
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plugin = parse_plugin_line(line)
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if not plugin[0]:
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msg = f"Invalid repository {line}, must be in the format owner/repo[ as alias]"
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print(msg, file=sys.stderr)
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sys.exit(1)
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plugins.append(plugin)
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return plugins
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def get_cache_path() -> Optional[Path]:
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xdg_cache = os.environ.get("XDG_CACHE_HOME", None)
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if xdg_cache is None:
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home = os.environ.get("HOME", None)
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if home is None:
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return None
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xdg_cache = str(Path(home, ".cache"))
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return Path(xdg_cache, "vim-plugin-cache.json")
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class Cache:
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def __init__(self, initial_plugins: List[Plugin]) -> None:
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self.cache_file = get_cache_path()
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downloads = {}
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for plugin in initial_plugins:
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downloads[plugin.commit] = plugin
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downloads.update(self.load())
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self.downloads = downloads
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def load(self) -> Dict[str, Plugin]:
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if self.cache_file is None or not self.cache_file.exists():
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return {}
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downloads: Dict[str, Plugin] = {}
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with open(self.cache_file) as f:
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data = json.load(f)
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for attr in data.values():
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p = Plugin(
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attr["name"], attr["commit"], attr["has_submodules"], attr["sha256"]
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)
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downloads[attr["commit"]] = p
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return downloads
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def store(self) -> None:
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if self.cache_file is None:
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return
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os.makedirs(self.cache_file.parent, exist_ok=True)
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with open(self.cache_file, "w+") as f:
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data = {}
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for name, attr in self.downloads.items():
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data[name] = attr.as_json()
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json.dump(data, f, indent=4, sort_keys=True)
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def __getitem__(self, key: str) -> Optional[Plugin]:
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return self.downloads.get(key, None)
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def __setitem__(self, key: str, value: Plugin) -> None:
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self.downloads[key] = value
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def prefetch(
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args: Tuple[str, str, str], cache: Cache
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) -> Tuple[str, str, Union[Exception, Plugin], dict]:
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assert len(args) == 3
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owner, repo, alias = args
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try:
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plugin, redirect = prefetch_plugin(owner, repo, alias, cache)
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cache[plugin.commit] = plugin
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return (owner, repo, plugin, redirect)
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except Exception as e:
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return (owner, repo, e, {})
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header = (
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"# This file has been generated by ./pkgs/misc/vim-plugins/update.py. Do not edit!"
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)
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def generate_nix(plugins: List[Tuple[str, str, Plugin]], outfile: str):
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sorted_plugins = sorted(plugins, key=lambda v: v[2].name.lower())
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with open(outfile, "w+") as f:
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f.write(header)
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f.write(
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"""
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{ lib, buildVimPluginFrom2Nix, fetchFromGitHub, overrides ? (self: super: {}) }:
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let
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packages = ( self:
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{"""
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)
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for owner, repo, plugin in sorted_plugins:
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if plugin.has_submodules:
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submodule_attr = "\n fetchSubmodules = true;"
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else:
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submodule_attr = ""
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f.write(
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f"""
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{plugin.normalized_name} = buildVimPluginFrom2Nix {{
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pname = "{plugin.normalized_name}";
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version = "{plugin.version}";
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src = fetchFromGitHub {{
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owner = "{owner}";
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repo = "{repo}";
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rev = "{plugin.commit}";
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sha256 = "{plugin.sha256}";{submodule_attr}
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}};
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}};
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"""
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)
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f.write(
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"""
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});
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in lib.fix' (lib.extends overrides packages)
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"""
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)
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print(f"updated {outfile}")
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def rewrite_input(input_file: Path, redirects: dict = None, append: Tuple = ()):
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with open(input_file, "r") as f:
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lines = f.readlines()
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lines.extend(append)
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if redirects:
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lines = [redirects.get(line, line) for line in lines]
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cur_date_iso = datetime.now().strftime("%Y-%m-%d")
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with open(DEPRECATED, "r") as f:
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deprecations = json.load(f)
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for old, new in redirects.items():
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old_name = old.split("/")[1].split(" ")[0].strip("\n")
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new_name = new.split("/")[1].split(" ")[0].strip("\n")
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if old_name != new_name:
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deprecations[old_name] = {
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"new": new_name,
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"date": cur_date_iso,
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}
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with open(DEPRECATED, "w") as f:
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json.dump(deprecations, f, indent=4, sort_keys=True)
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lines = sorted(lines, key=str.casefold)
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with open(input_file, "w") as f:
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f.writelines(lines)
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def parse_args():
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parser = argparse.ArgumentParser(
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description=(
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"Updates nix derivations for vim plugins"
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f"By default from {DEFAULT_IN} to {DEFAULT_OUT}"
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)
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)
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parser.add_argument(
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"--add",
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"-a",
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dest="add_plugins",
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default=[],
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action="append",
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help="Plugin to add to vimPlugins in the form owner/repo",
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)
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parser.add_argument(
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"--input-names",
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"-i",
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dest="input_file",
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default=DEFAULT_IN,
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help="A list of plugins in the form owner/repo",
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)
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parser.add_argument(
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"--out",
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"-o",
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dest="outfile",
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default=DEFAULT_OUT,
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help="Filename to save generated nix code",
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)
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parser.add_argument(
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"--proc",
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"-p",
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dest="proc",
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type=int,
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default=30,
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help="Number of concurrent processes to spawn.",
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)
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parser.add_argument(
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"--commit",
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dest="commit",
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action="store_true",
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help="Automatically commit updates",
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)
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parser.add_argument(
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"--allow-dirty",
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dest="allow_dirty",
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action="store_true",
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help=(
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"Allow commit to continue even if state is unexpectedly dirty. "
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"This is only helpful when developing vimPlugins infrastructure."
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),
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)
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return parser.parse_args()
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class NixpkgsRepo:
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def __init__(self, allow_dirty: bool):
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self.allow_dirty: bool = allow_dirty
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self.repo: git.Repo = git.Repo(NIXPKGS_PATH)
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if self.is_unexpectedly_dirty():
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raise Exception("Please stash changes before updating.")
|
|
|
|
def commit(self, message: str, files: List[Path]) -> None:
|
|
files_staged = self.repo.index.add([str(f.resolve()) for f in files])
|
|
|
|
if files_staged:
|
|
print(f'committing to nixpkgs "{message}"')
|
|
self.repo.index.commit(message)
|
|
assert self.is_unexpectedly_dirty() is False
|
|
else:
|
|
print("no changes in working tree to commit")
|
|
|
|
def is_unexpectedly_dirty(self) -> bool:
|
|
return self.repo.is_dirty() and not self.allow_dirty
|
|
|
|
|
|
class PluginUpdater:
|
|
def __init__(self, input_file: str, outfile: str, proc: int):
|
|
self.input_file: str = input_file
|
|
self.outfile: str = outfile
|
|
self.proc = proc
|
|
self.cache: Cache = Cache(get_current_plugins())
|
|
self.prefetch = functools.partial(prefetch, cache=self.cache)
|
|
|
|
def __call__(self) -> Dict:
|
|
plugin_names = load_plugin_spec(self.input_file)
|
|
|
|
try:
|
|
# synchronous variant for debugging
|
|
# results = list(map(self.prefetch, plugin_names))
|
|
pool = Pool(processes=self.proc)
|
|
results = pool.map(self.prefetch, plugin_names)
|
|
finally:
|
|
self.cache.store()
|
|
|
|
plugins, redirects = check_results(results)
|
|
|
|
generate_nix(plugins, self.outfile)
|
|
|
|
return redirects
|
|
|
|
|
|
def main() -> None:
|
|
args = parse_args()
|
|
if args.add_plugins and not args.commit:
|
|
raise Exception("The --add argument requires setting the --commit flag.")
|
|
if args.commit:
|
|
nixpkgs_repo = NixpkgsRepo(args.allow_dirty)
|
|
updater = PluginUpdater(args.input_file, args.outfile, args.proc)
|
|
|
|
redirects = updater()
|
|
rewrite_input(args.input_file, redirects)
|
|
|
|
if args.commit:
|
|
nixpkgs_repo.commit("vimPlugins: Update", [args.outfile])
|
|
if redirects:
|
|
updater()
|
|
nixpkgs_repo.commit(
|
|
"vimPlugins: Update redirects",
|
|
[args.outfile, args.input_file, DEPRECATED],
|
|
)
|
|
for plugin_line in args.add_plugins:
|
|
rewrite_input(args.input_file, append=(plugin_line + "\n",))
|
|
updater()
|
|
|
|
plugin, _ = prefetch_plugin(*parse_plugin_line(plugin_line))
|
|
nixpkgs_repo.commit(
|
|
"vimPlugins.{name}: init at {version}".format(
|
|
name=plugin.normalized_name, version=plugin.version
|
|
),
|
|
[args.outfile, args.input_file, OVERRIDES],
|
|
)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|