322 lines
14 KiB
Python
322 lines
14 KiB
Python
"""Gitea HTTP/Git transport using only a projected systemd credential."""
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from __future__ import annotations
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from dataclasses import dataclass
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import json
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import os
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from pathlib import Path
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import subprocess
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import tempfile
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from typing import Any, Mapping
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from urllib.error import HTTPError, URLError
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from urllib.parse import quote, urlencode
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from urllib.request import Request, urlopen
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class GiteaTransportError(RuntimeError):
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pass
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def _safe_oid(value: str, field: str) -> str:
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if not isinstance(value, str) or len(value) != 40 or any(ch not in "0123456789abcdef" for ch in value):
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raise GiteaTransportError(f"{field}_INVALID")
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return value
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def _safe_branch(value: str) -> str:
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branch = str(value or "")
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if (
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not branch
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or len(branch) > 240
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or branch != branch.strip()
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or branch.startswith(("/", "-", "."))
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or branch.endswith(("/", ".", ".lock"))
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or ".." in branch
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or "//" in branch
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or "@{" in branch
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or "\\" in branch
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or any(part in {"", ".", ".."} for part in branch.split("/"))
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or any(ch not in "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._/-" for ch in branch)
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):
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raise GiteaTransportError("BRANCH_INVALID")
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return branch
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@dataclass(slots=True)
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class GiteaMachineTransport:
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api_base: str
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repository_id: str
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remote_url: str
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authority_git_dir: Path
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credential_name: str = "gitea-machine-token"
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actor: str = "aios-autonomy-agent"
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timeout: int = 20
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expected_merge_head: str | None = None
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expected_merge_base: str | None = None
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def __post_init__(self) -> None:
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if self.credential_name != "gitea-machine-token":
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raise GiteaTransportError("CREDENTIAL_NAME_INVALID")
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if "/" not in self.repository_id or self.repository_id.startswith("/"):
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raise GiteaTransportError("REPOSITORY_INVALID")
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if not self.api_base.startswith("https://") and not self.api_base.startswith("http://127.0.0.1"):
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raise GiteaTransportError("GITEA_API_SCOPE_INVALID")
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if not self.remote_url.startswith("https://"):
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raise GiteaTransportError("GITEA_REMOTE_SCOPE_INVALID")
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@property
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def _credential_path(self) -> Path:
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directory = os.environ.get("CREDENTIALS_DIRECTORY", "")
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if not directory:
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raise GiteaTransportError("CREDENTIAL_PROJECTION_MISSING")
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path = Path(directory) / self.credential_name
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if path.is_symlink() or not path.is_file():
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raise GiteaTransportError("CREDENTIAL_PROJECTION_MISSING")
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return path
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def _token(self) -> str:
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value = self._credential_path.read_text(encoding="utf-8").strip()
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if not value:
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raise GiteaTransportError("CREDENTIAL_EMPTY")
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return value
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def _request(self, method: str, path: str, body: Mapping[str, Any] | None = None) -> tuple[int, Any]:
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data = None if body is None else json.dumps(dict(body), separators=(",", ":")).encode()
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headers = {"Accept": "application/json", "Authorization": f"token {self._token()}"}
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if data is not None:
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headers["Content-Type"] = "application/json"
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request = Request(self.api_base.rstrip("/") + path, data=data, headers=headers, method=method)
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try:
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with urlopen(request, timeout=self.timeout) as response:
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raw = response.read()
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return response.status, json.loads(raw.decode()) if raw else {}
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except HTTPError as exc:
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# Never include response bodies: Gitea may echo sensitive request context.
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raise GiteaTransportError(f"GITEA_HTTP_{exc.code}") from exc
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except (URLError, TimeoutError, OSError) as exc:
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raise GiteaTransportError("GITEA_NETWORK_ERROR") from exc
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def whoami(self) -> Mapping[str, Any]:
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return self._request("GET", "/user")[1]
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def repository_info(self) -> Mapping[str, Any]:
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owner, name = self.repository_id.split("/", 1)
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return self._request("GET", f"/repos/{quote(owner)}/{quote(name)}")[1]
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def repository(self, owner: str, name: str) -> Mapping[str, Any]:
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if f"{owner}/{name}" != self.repository_id:
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raise GiteaTransportError("REPOSITORY_SCOPE_DENIED")
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return self.repository_info()
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def read_branch(self, branch: str) -> str | None:
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branch = _safe_branch(branch)
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owner, name = self.repository_id.split("/", 1)
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try:
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value = self._request("GET", f"/repos/{quote(owner)}/{quote(name)}/branches/{quote(branch, safe='/')}")[1]
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except GiteaTransportError as exc:
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if str(exc) == "GITEA_HTTP_404":
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return None
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raise
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sha = value.get("commit", {}).get("id") if isinstance(value, dict) else None
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return _safe_oid(sha, "remote_branch_oid")
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def _askpass(self) -> tuple[Path, dict[str, str]]:
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credential = self._credential_path
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fd, name = tempfile.mkstemp(prefix="aios-gitea-askpass-", dir="/tmp")
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path = Path(name)
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os.fchmod(fd, 0o700)
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script = "#!/bin/sh\ncase \"$1\" in *Username*) printf '%s\\n' \"$GITEA_MACHINE_ACTOR\" ;; *) cat \"$CREDENTIAL_FILE\" ;; esac\n"
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with os.fdopen(fd, "w", encoding="utf-8") as stream:
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stream.write(script)
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stream.flush()
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os.fsync(stream.fileno())
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return path, {
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"GIT_ASKPASS": str(path),
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"GIT_TERMINAL_PROMPT": "0",
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"GITEA_MACHINE_ACTOR": self.actor,
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"CREDENTIAL_FILE": str(credential),
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}
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def _push_branch_fast_forward(self, branch: str, new_oid: str) -> None:
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askpass, additions = self._askpass()
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environment = os.environ.copy()
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environment.update(additions)
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try:
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result = subprocess.run(
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["git", f"--git-dir={self.authority_git_dir}", "push", self.remote_url, f"{new_oid}:refs/heads/{branch}"],
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text=True,
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capture_output=True,
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check=False,
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env=environment,
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timeout=self.timeout,
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)
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if result.returncode != 0:
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raise GiteaTransportError("GITEA_BRANCH_CREATE_FAILED")
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finally:
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askpass.unlink(missing_ok=True)
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def fetch_branch_exact(self, branch: str, expected_oid: str) -> str:
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"""Fetch one exact remote branch tip into a quarantine ref.
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This never updates ``main`` or any caller-visible branch. The remote
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ref is read before and after the fetch so a concurrent branch move
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cannot be silently admitted.
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"""
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branch = _safe_branch(branch)
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expected_oid = _safe_oid(expected_oid, "expected_oid")
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remote_before = self.read_branch(branch)
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if remote_before != expected_oid:
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raise GiteaTransportError("GITEA_SOURCE_REF_MISMATCH")
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target_ref = f"refs/aios/release-sources/{expected_oid}"
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current = subprocess.run(
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[
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"git",
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f"--git-dir={self.authority_git_dir}",
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"rev-parse",
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"--verify",
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f"{target_ref}^{{commit}}",
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],
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text=True,
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capture_output=True,
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check=False,
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timeout=self.timeout,
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)
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if current.returncode == 0 and current.stdout.strip().lower() == expected_oid:
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remote_after = self.read_branch(branch)
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if remote_after != expected_oid:
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raise GiteaTransportError("GITEA_SOURCE_REF_MOVED")
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return expected_oid
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askpass, additions = self._askpass()
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environment = os.environ.copy()
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environment.update(additions)
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try:
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result = subprocess.run(
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[
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"git",
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f"--git-dir={self.authority_git_dir}",
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"fetch",
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"--no-tags",
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"--no-write-fetch-head",
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self.remote_url,
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f"refs/heads/{branch}:{target_ref}",
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],
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text=True,
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capture_output=True,
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check=False,
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env=environment,
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timeout=self.timeout,
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)
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if result.returncode != 0:
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raise GiteaTransportError("GITEA_SOURCE_FETCH_FAILED")
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finally:
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askpass.unlink(missing_ok=True)
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local = subprocess.run(
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[
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"git",
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f"--git-dir={self.authority_git_dir}",
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"rev-parse",
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"--verify",
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f"{target_ref}^{{commit}}",
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],
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text=True,
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capture_output=True,
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check=False,
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timeout=self.timeout,
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)
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local_oid = local.stdout.strip().lower()
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if local.returncode != 0 or local_oid != expected_oid:
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subprocess.run(
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[
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"git",
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f"--git-dir={self.authority_git_dir}",
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"update-ref",
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"-d",
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target_ref,
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],
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text=True,
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capture_output=True,
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check=False,
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timeout=self.timeout,
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)
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raise GiteaTransportError("GITEA_SOURCE_FETCH_MISMATCH")
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remote_after = self.read_branch(branch)
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if remote_after != expected_oid:
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raise GiteaTransportError("GITEA_SOURCE_REF_MOVED")
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return expected_oid
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def compare_and_swap_branch(self, branch: str, expected_oid: str, new_oid: str) -> str:
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_safe_oid(expected_oid, "expected_oid")
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_safe_oid(new_oid, "new_oid")
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current = self.read_branch(branch)
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if current == new_oid:
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return new_oid
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if current is None:
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self._push_branch_fast_forward(branch, new_oid)
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readback = self.read_branch(branch)
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if readback != new_oid:
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raise GiteaTransportError("GITEA_BRANCH_CREATE_READBACK_MISMATCH")
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return readback
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if current != expected_oid:
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raise GiteaTransportError("GITEA_BRANCH_EXPECTATION_MISMATCH")
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# The preflight read binds the expected old tip. The Git receive-pack
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# then enforces the actual fast-forward CAS while transferring the new
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# objects; no force/lease override or arbitrary ref is permitted.
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self._push_branch_fast_forward(branch, new_oid)
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readback = self.read_branch(branch)
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if readback != new_oid:
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raise GiteaTransportError("GITEA_BRANCH_CAS_READBACK_MISMATCH")
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return readback
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def _pulls(self) -> list[Mapping[str, Any]]:
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owner, name = self.repository_id.split("/", 1)
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query = urlencode({"state": "all", "base_branch": "main", "limit": 100})
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value = self._request("GET", f"/repos/{quote(owner)}/{quote(name)}/pulls?{query}")[1]
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return value if isinstance(value, list) else []
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def create_or_update_pr(self, branch: str, target: str, title: str, body: str) -> Mapping[str, Any]:
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if target != "main":
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raise GiteaTransportError("PR_BASE_SCOPE_DENIED")
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head = self.read_branch(branch)
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if head is None:
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raise GiteaTransportError("PR_HEAD_MISSING")
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matches = [p for p in self._pulls() if (p.get("head") or {}).get("ref") == branch and (p.get("base") or {}).get("ref") == target]
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open_matches = [p for p in matches if p.get("state") == "open"]
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if len(open_matches) > 1:
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raise GiteaTransportError("MULTIPLE_MATCHING_PRS")
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if open_matches:
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if (open_matches[0].get("head") or {}).get("sha") != head:
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raise GiteaTransportError("PR_HEAD_CONFLICT")
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return open_matches[0]
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owner, name = self.repository_id.split("/", 1)
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return self._request("POST", f"/repos/{quote(owner)}/{quote(name)}/pulls", {"head": branch, "base": target, "title": title, "body": body, "allow_maintainer_edit": False})[1]
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def publish_status(self, branch: str, state: str, description: str, context: str = "aios/durable-release") -> Mapping[str, Any]:
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oid = self.read_branch(branch)
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if oid is None:
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raise GiteaTransportError("STATUS_BRANCH_MISSING")
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owner, name = self.repository_id.split("/", 1)
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return self._request("POST", f"/repos/{quote(owner)}/{quote(name)}/statuses/{oid}", {"state": state, "context": context, "description": description})[1]
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def protected_merge(self, pr_number: int) -> Mapping[str, Any]:
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if not isinstance(pr_number, int) or pr_number < 1:
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raise GiteaTransportError("PR_NUMBER_INVALID")
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owner, name = self.repository_id.split("/", 1)
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pr = self._request("GET", f"/repos/{quote(owner)}/{quote(name)}/pulls/{pr_number}")[1]
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if pr.get("state") != "open" or (pr.get("base") or {}).get("ref") != "main":
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raise GiteaTransportError("PR_MERGE_BINDING_INVALID")
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if pr.get("mergeable") is False:
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raise GiteaTransportError("PR_NOT_MERGEABLE")
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head_oid = (pr.get("head") or {}).get("sha")
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base_oid = (pr.get("base") or {}).get("sha")
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if self.expected_merge_head is not None and head_oid != self.expected_merge_head:
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raise GiteaTransportError("PR_HEAD_EXPECTATION_MISMATCH")
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if self.expected_merge_base is not None and base_oid != self.expected_merge_base:
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raise GiteaTransportError("PR_BASE_EXPECTATION_MISMATCH")
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body = {"do": "fast-forward-only", "force_merge": False, "merge_when_checks_succeed": False, "head_commit_id": head_oid}
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return self._request("POST", f"/repos/{quote(owner)}/{quote(name)}/pulls/{pr_number}/merge", body)[1]
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