0a2759483a
- Use git.Repo(ROOT, search_parent_directories=True) to find nixpkgs repo. - Don't commit overrides.nix. - Remove "-a" short argument. - Remove "--commit" flag and commit by default. - Improve help/error messages. - Favor closure pattern over classes.Use a closure to wrap the update function with state rather than a callable class. - break NixpkgsRepo class into functions - Optional None-type arguments - Remove repo checks from update.py. Git is too flexible and permits too many workflows for my attempt to replace documentation with code to work. My goal would be to separate the `--add` functionality from the update functionality in the near term and then there will be no reason for this usage to create commits anyway.
556 lines
17 KiB
Python
Executable file
556 lines
17 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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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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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: Optional[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 is None 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: Optional[str], cache: "Optional[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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cached_plugin = cache[commit] if cache else None
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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 fetch_plugin_from_pluginline(plugin_line: str) -> Plugin:
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plugin, _ = prefetch_plugin(*parse_plugin_line(plugin_line))
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return plugin
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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, Optional[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(), None)
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def load_plugin_spec(plugin_file: str) -> List[Tuple[str, str, Optional[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(
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input_file: Path, redirects: Dict[str, str] = None, append: Tuple = ()
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):
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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_plugin = fetch_plugin_from_pluginline(old)
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new_plugin = fetch_plugin_from_pluginline(new)
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if old_plugin.normalized_name != new_plugin.normalized_name:
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deprecations[old_plugin.normalized_name] = {
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"new": new_plugin.normalized_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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dest="add_plugins",
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default=[],
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action="append",
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help="Plugin to add to vimPlugins from Github 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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return parser.parse_args()
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def commit(repo: git.Repo, message: str, files: List[Path]) -> None:
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files_staged = repo.index.add([str(f.resolve()) for f in files])
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if files_staged:
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print(f'committing to nixpkgs "{message}"')
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repo.index.commit(message)
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else:
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print("no changes in working tree to commit")
|
|
|
|
|
|
def get_update(input_file: str, outfile: str, proc: int):
|
|
cache: Cache = Cache(get_current_plugins())
|
|
_prefetch = functools.partial(prefetch, cache=cache)
|
|
|
|
def update() -> dict:
|
|
plugin_names = load_plugin_spec(input_file)
|
|
|
|
try:
|
|
pool = Pool(processes=proc)
|
|
results = pool.map(_prefetch, plugin_names)
|
|
finally:
|
|
cache.store()
|
|
|
|
plugins, redirects = check_results(results)
|
|
|
|
generate_nix(plugins, outfile)
|
|
|
|
return redirects
|
|
|
|
return update
|
|
|
|
|
|
def main():
|
|
args = parse_args()
|
|
nixpkgs_repo = git.Repo(ROOT, search_parent_directories=True)
|
|
update = get_update(args.input_file, args.outfile, args.proc)
|
|
|
|
redirects = update()
|
|
rewrite_input(args.input_file, redirects)
|
|
commit(nixpkgs_repo, "vimPlugins: update", [args.outfile])
|
|
|
|
if redirects:
|
|
update()
|
|
commit(
|
|
nixpkgs_repo,
|
|
"vimPlugins: resolve github repository redirects",
|
|
[args.outfile, args.input_file, DEPRECATED],
|
|
)
|
|
|
|
for plugin_line in args.add_plugins:
|
|
rewrite_input(args.input_file, append=(plugin_line + "\n",))
|
|
update()
|
|
plugin = fetch_plugin_from_pluginline(plugin_line)
|
|
commit(
|
|
nixpkgs_repo,
|
|
"vimPlugins.{name}: init at {version}".format(
|
|
name=plugin.normalized_name, version=plugin.version
|
|
),
|
|
[args.outfile, args.input_file],
|
|
)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|