import { realpathSync, statSync } from "node:fs"; import { spawnSync } from "node:child_process"; import path from "node:path";

export type CodeAgentWorkspace = { readonly repoRoot: string; readonly cwd: string; readonly canonicalCwd: string; readonly relativeCwd: string; };

type ResolveCodeAgentWorkspaceOptions = { cwd: string; };

function runGit(args: string[], cwd: string) { const result = spawnSync("git", args, { cwd, encoding: "utf8" }); return { stdout: String(result.stdout || "").trim(), status: typeof result.status === "number" ? result.status : 1, error: result.error }; }

function resolveRepoRoot(targetCwd: string): string { const absoluteTargetCwd = path.resolve(String(targetCwd || "").trim() || process.cwd()); let targetStats: ReturnType; try { targetStats = statSync(absoluteTargetCwd); } catch { throw new Error(Code worker directory does not exist: ${absoluteTargetCwd}); } if (!targetStats.isDirectory()) { throw new Error(Code worker directory must be a directory: ${absoluteTargetCwd}); }

const resolvedTargetCwd = realpathSync(absoluteTargetCwd); const result = runGit(["rev-parse", "--show-toplevel"], resolvedTargetCwd); if (!result.error && result.status === 0 && result.stdout) { return realpathSync(result.stdout); } return resolvedTargetCwd; }

export function resolveCodeAgentWorkspace({ cwd }: ResolveCodeAgentWorkspaceOptions): CodeAgentWorkspace { const absoluteRequestedCwd = path.resolve(String(cwd || "").trim() || process.cwd()); const repoRoot = resolveRepoRoot(absoluteRequestedCwd); const resolvedRequestedCwd = realpathSync(absoluteRequestedCwd); const relativeCwd = path.relative(repoRoot, resolvedRequestedCwd); if (relativeCwd.startsWith("..") || path.isAbsolute(relativeCwd)) { throw new Error(Code worker directory must stay inside repo root: ${repoRoot}); }

return { repoRoot, cwd: resolvedRequestedCwd, canonicalCwd: resolvedRequestedCwd, relativeCwd }; }