674 lines
21 KiB
Python
674 lines
21 KiB
Python
# Used by pkgs/applications/editors/vim/plugins/update.py and pkgs/applications/editors/kakoune/plugins/update.py
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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 logging
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import sys
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import time
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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 functools import wraps
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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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from dataclasses import dataclass
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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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LOG_LEVELS = {
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logging.getLevelName(level): level for level in [
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logging.DEBUG, logging.INFO, logging.WARN, logging.ERROR ]
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}
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log = logging.getLogger()
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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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@dataclass
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class FetchConfig:
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proc: int
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github_token: str
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def make_request(url: str, token=None) -> urllib.request.Request:
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headers = {}
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if token is not None:
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headers["Authorization"] = f"token {token}"
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return urllib.request.Request(url, headers=headers)
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class Repo:
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def __init__(
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self, uri: str, branch: str, alias: Optional[str]
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) -> None:
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self.uri = uri
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'''Url to the repo'''
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self.branch = branch
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self.alias = alias
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self.redirect: Dict[str, str] = {}
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self.token = "dummy_token"
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@property
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def name(self):
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return self.uri.split('/')[-1]
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def __repr__(self) -> str:
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return f"Repo({self.name}, {self.uri})"
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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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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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loaded = self._prefetch(None)
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updated = datetime.strptime(loaded['date'], "%Y-%m-%dT%H:%M:%S%z")
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return loaded['rev'], updated
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def _prefetch(self, ref: Optional[str]):
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cmd = ["nix-prefetch-git", "--quiet", "--fetch-submodules", self.uri]
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if ref is not None:
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cmd.append(ref)
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log.debug(cmd)
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data = subprocess.check_output(cmd)
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loaded = json.loads(data)
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return loaded
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def prefetch(self, ref: Optional[str]) -> str:
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loaded = self._prefetch(ref)
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return loaded["sha256"]
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def as_nix(self, plugin: "Plugin") -> str:
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return f'''fetchgit {{
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url = "{self.uri}";
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rev = "{plugin.commit}";
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sha256 = "{plugin.sha256}";
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}}'''
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class RepoGitHub(Repo):
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def __init__(
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self, owner: str, repo: str, branch: str, alias: Optional[str]
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) -> None:
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self.owner = owner
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self.repo = repo
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self.token = None
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'''Url to the repo'''
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super().__init__(self.url(""), branch, alias)
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log.debug("Instantiating github repo %s/%s", self.owner, self.repo)
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@property
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def name(self):
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return self.repo
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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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@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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req = make_request(self.url(f"blob/{self.branch}/.gitmodules"), self.token)
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urllib.request.urlopen(req, timeout=10).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(f"commits/{self.branch}.atom")
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commit_req = make_request(commit_url, self.token)
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with urllib.request.urlopen(commit_req, 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(self, commit: str) -> str:
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if self.has_submodules():
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sha256 = super().prefetch(commit)
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else:
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sha256 = self.prefetch_github(commit)
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return 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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def as_nix(self, plugin: "Plugin") -> str:
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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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return f'''fetchFromGitHub {{
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owner = "{self.owner}";
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repo = "{self.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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@dataclass
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class PluginDesc:
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repo: Repo
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branch: str
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alias: Optional[str]
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@property
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def name(self):
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if self.alias is None:
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return self.repo.name
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else:
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return self.alias
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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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class Editor:
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"""The configuration of the update script."""
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def __init__(
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self,
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name: str,
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root: Path,
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get_plugins: str,
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default_in: Optional[Path] = None,
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default_out: Optional[Path] = None,
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deprecated: Optional[Path] = None,
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cache_file: Optional[str] = None,
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):
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log.debug("get_plugins:", get_plugins)
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self.name = name
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self.root = root
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self.get_plugins = get_plugins
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self.default_in = default_in or root.joinpath(f"{name}-plugin-names")
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self.default_out = default_out or root.joinpath("generated.nix")
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self.deprecated = deprecated or root.joinpath("deprecated.json")
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self.cache_file = cache_file or f"{name}-plugin-cache.json"
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def get_current_plugins(self):
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"""To fill the cache"""
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return get_current_plugins(self)
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def load_plugin_spec(self, config: FetchConfig, plugin_file) -> List[PluginDesc]:
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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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if line.startswith("#"):
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continue
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plugin = parse_plugin_line(config, line)
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plugins.append(plugin)
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return plugins
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def generate_nix(self, plugins, outfile: str):
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'''Returns nothing for now, writes directly to outfile'''
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raise NotImplementedError()
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def get_update(self, input_file: str, outfile: str, config: FetchConfig):
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cache: Cache = Cache(self.get_current_plugins(), self.cache_file)
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_prefetch = functools.partial(prefetch, cache=cache)
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def update() -> dict:
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plugin_names = self.load_plugin_spec(config, input_file)
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try:
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pool = Pool(processes=config.proc)
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results = pool.map(_prefetch, plugin_names)
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finally:
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cache.store()
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plugins, redirects = check_results(results)
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self.generate_nix(plugins, outfile)
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return redirects
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return update
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@property
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def attr_path(self):
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return self.name + "Plugins"
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def get_drv_name(self, name: str):
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return self.attr_path + "." + name
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def rewrite_input(self, *args, **kwargs):
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return rewrite_input(*args, **kwargs)
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def create_parser(self):
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parser = argparse.ArgumentParser(
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description=(f"""
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Updates nix derivations for {self.name} plugins.\n
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By default from {self.default_in} to {self.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=f"Plugin to add to {self.attr_path} 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=self.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=self.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. Setting --github-token allows higher values.",
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)
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parser.add_argument(
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"--github-token",
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"-t",
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type=str,
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default=os.getenv("GITHUB_API_TOKEN"),
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help="""Allows to set --proc to higher values.
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Uses GITHUB_API_TOKEN environment variables as the default value.""",
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)
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parser.add_argument(
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"--no-commit", "-n", action="store_true", default=False,
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help="Whether to autocommit changes"
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)
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parser.add_argument(
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"--debug", "-d", choices=LOG_LEVELS.keys(),
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default=logging.getLevelName(logging.WARN),
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help="Adjust log level"
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)
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return parser
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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(Path(__file__).parent.parent.parent)
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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(editor: Editor) -> List[Plugin]:
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with CleanEnvironment():
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cmd = ["nix", "eval", "--extra-experimental-features", "nix-command", "--impure", "--json", "--expr", editor.get_plugins]
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log.debug("Running command %s", cmd)
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out = subprocess.check_output(cmd)
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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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p: PluginDesc,
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cache: "Optional[Cache]" = None,
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) -> Tuple[Plugin, Dict[str, str]]:
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repo, branch, alias = p.repo, p.branch, p.alias
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name = alias or p.repo.name
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commit = None
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log.info(f"Fetching last commit for plugin {name} from {repo.uri}@{branch}")
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commit, date = repo.latest_commit()
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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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log.debug("Cache hit !")
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cached_plugin.name = name
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cached_plugin.date = date
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return cached_plugin, repo.redirect
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has_submodules = repo.has_submodules()
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print(f"prefetch {name}")
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sha256 = repo.prefetch(commit)
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return (
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Plugin(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(config: FetchConfig, plugin_line: str) -> Plugin:
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plugin, _ = prefetch_plugin(parse_plugin_line(config, 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[PluginDesc, Union[Exception, Plugin], Dict[str, str]]]
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) -> Tuple[List[Tuple[PluginDesc, Plugin]], Dict[str, str]]:
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''' '''
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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 (pdesc, result, redirect) in results:
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if isinstance(result, Exception):
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failures.append((pdesc.name, result))
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else:
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plugins.append((pdesc, 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 make_repo(uri, branch, alias) -> Repo:
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'''Instantiate a Repo with the correct specialization depending on server (gitub spec)'''
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# dumb check to see if it's of the form owner/repo (=> github) or https://...
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res = uri.split('/')
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if len(res) <= 2:
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repo = RepoGitHub(res[0], res[1], branch, alias)
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else:
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repo = Repo(uri.strip(), branch, alias)
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return repo
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def parse_plugin_line(config: FetchConfig, line: str) -> PluginDesc:
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branch = "HEAD"
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alias = None
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uri = line
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if " as " in uri:
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uri, alias = uri.split(" as ")
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alias = alias.strip()
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if "@" in uri:
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uri, branch = uri.split("@")
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repo = make_repo(uri.strip(), branch.strip(), alias)
|
|
repo.token = config.github_token
|
|
|
|
return PluginDesc(repo, branch.strip(), alias)
|
|
|
|
|
|
def get_cache_path(cache_file_name: str) -> Optional[Path]:
|
|
xdg_cache = os.environ.get("XDG_CACHE_HOME", None)
|
|
if xdg_cache is None:
|
|
home = os.environ.get("HOME", None)
|
|
if home is None:
|
|
return None
|
|
xdg_cache = str(Path(home, ".cache"))
|
|
|
|
return Path(xdg_cache, cache_file_name)
|
|
|
|
|
|
class Cache:
|
|
def __init__(self, initial_plugins: List[Plugin], cache_file_name: str) -> None:
|
|
self.cache_file = get_cache_path(cache_file_name)
|
|
|
|
downloads = {}
|
|
for plugin in initial_plugins:
|
|
downloads[plugin.commit] = plugin
|
|
downloads.update(self.load())
|
|
self.downloads = downloads
|
|
|
|
def load(self) -> Dict[str, Plugin]:
|
|
if self.cache_file is None or not self.cache_file.exists():
|
|
return {}
|
|
|
|
downloads: Dict[str, Plugin] = {}
|
|
with open(self.cache_file) as f:
|
|
data = json.load(f)
|
|
for attr in data.values():
|
|
p = Plugin(
|
|
attr["name"], attr["commit"], attr["has_submodules"], attr["sha256"]
|
|
)
|
|
downloads[attr["commit"]] = p
|
|
return downloads
|
|
|
|
def store(self) -> None:
|
|
if self.cache_file is None:
|
|
return
|
|
|
|
os.makedirs(self.cache_file.parent, exist_ok=True)
|
|
with open(self.cache_file, "w+") as f:
|
|
data = {}
|
|
for name, attr in self.downloads.items():
|
|
data[name] = attr.as_json()
|
|
json.dump(data, f, indent=4, sort_keys=True)
|
|
|
|
def __getitem__(self, key: str) -> Optional[Plugin]:
|
|
return self.downloads.get(key, None)
|
|
|
|
def __setitem__(self, key: str, value: Plugin) -> None:
|
|
self.downloads[key] = value
|
|
|
|
|
|
def prefetch(
|
|
pluginDesc: PluginDesc, cache: Cache
|
|
) -> Tuple[PluginDesc, Union[Exception, Plugin], dict]:
|
|
try:
|
|
plugin, redirect = prefetch_plugin(pluginDesc, cache)
|
|
cache[plugin.commit] = plugin
|
|
return (pluginDesc, plugin, redirect)
|
|
except Exception as e:
|
|
return (pluginDesc, e, {})
|
|
|
|
|
|
def rewrite_input(
|
|
config: FetchConfig,
|
|
input_file: Path,
|
|
deprecated: Path,
|
|
redirects: Dict[str, str] = None,
|
|
append: Tuple = (),
|
|
):
|
|
with open(input_file, "r") as f:
|
|
lines = f.readlines()
|
|
|
|
lines.extend(append)
|
|
|
|
if redirects:
|
|
lines = [redirects.get(line, line) for line in lines]
|
|
|
|
cur_date_iso = datetime.now().strftime("%Y-%m-%d")
|
|
with open(deprecated, "r") as f:
|
|
deprecations = json.load(f)
|
|
for old, new in redirects.items():
|
|
old_plugin = fetch_plugin_from_pluginline(config, old)
|
|
new_plugin = fetch_plugin_from_pluginline(config, new)
|
|
if old_plugin.normalized_name != new_plugin.normalized_name:
|
|
deprecations[old_plugin.normalized_name] = {
|
|
"new": new_plugin.normalized_name,
|
|
"date": cur_date_iso,
|
|
}
|
|
with open(deprecated, "w") as f:
|
|
json.dump(deprecations, f, indent=4, sort_keys=True)
|
|
f.write("\n")
|
|
|
|
lines = sorted(lines, key=str.casefold)
|
|
|
|
with open(input_file, "w") as f:
|
|
f.writelines(lines)
|
|
|
|
|
|
def commit(repo: git.Repo, message: str, files: List[Path]) -> None:
|
|
repo.index.add([str(f.resolve()) for f in files])
|
|
|
|
if repo.index.diff("HEAD"):
|
|
print(f'committing to nixpkgs "{message}"')
|
|
repo.index.commit(message)
|
|
else:
|
|
print("no changes in working tree to commit")
|
|
|
|
|
|
|
|
def update_plugins(editor: Editor, args):
|
|
"""The main entry function of this module. All input arguments are grouped in the `Editor`."""
|
|
|
|
log.setLevel(LOG_LEVELS[args.debug])
|
|
log.info("Start updating plugins")
|
|
fetch_config = FetchConfig(args.proc, args.github_token)
|
|
update = editor.get_update(args.input_file, args.outfile, fetch_config)
|
|
|
|
redirects = update()
|
|
editor.rewrite_input(fetch_config, args.input_file, editor.deprecated, redirects)
|
|
|
|
autocommit = not args.no_commit
|
|
|
|
nixpkgs_repo = None
|
|
if autocommit:
|
|
nixpkgs_repo = git.Repo(editor.root, search_parent_directories=True)
|
|
commit(nixpkgs_repo, f"{editor.attr_path}: update", [args.outfile])
|
|
|
|
if redirects:
|
|
update()
|
|
if autocommit:
|
|
commit(
|
|
nixpkgs_repo,
|
|
f"{editor.attr_path}: resolve github repository redirects",
|
|
[args.outfile, args.input_file, editor.deprecated],
|
|
)
|
|
|
|
for plugin_line in args.add_plugins:
|
|
editor.rewrite_input(fetch_config, args.input_file, editor.deprecated, append=(plugin_line + "\n",))
|
|
update()
|
|
plugin = fetch_plugin_from_pluginline(fetch_config, plugin_line)
|
|
if autocommit:
|
|
commit(
|
|
nixpkgs_repo,
|
|
"{drv_name}: init at {version}".format(
|
|
drv_name=editor.get_drv_name(plugin.normalized_name),
|
|
version=plugin.version
|
|
),
|
|
[args.outfile, args.input_file],
|
|
)
|