@sema-agent/core/dist/engine/execution-env/symlink-chain.js

Stateless, task-oriented AI agent core

import { dirname, isAbsolute, sep } from "node:path";
import { isUncSpelling } from "../../core/unc-spelling.js";
import { err, ok } from "../harness/types.js";
export function anchorAtLinkDir(linkDir, target, separator) {
    const endsInSeparator = linkDir.endsWith(separator) || (separator === "\\" && linkDir.endsWith("/"));
    return endsInSeparator ? `${linkDir}${target}` : `${linkDir}${separator}${target}`;
}
export const SYMLINK_CHAIN_MAX_HOPS = 64;
export async function walkSymlinkChain(start, readLink) {
    const hops = [];
    const seen = new Set([start]);
    let cur = start;
    for (let hop = 0; hop < SYMLINK_CHAIN_MAX_HOPS; hop++) {
        const read = await readLink(cur);
        if (!read.ok) {
            const code = read.error.code;
            if (code === "invalid" || code === "not_found" || code === "not_directory")
                return ok({ hops });
            return err(read.error);
        }
        const target = read.value;
        const next = isAbsolute(target) ? target : anchorAtLinkDir(dirname(cur), target, sep);
        if (seen.has(next))
            break;
        hops.push(next);
        if (process.platform === "win32" && isUncSpelling(next))
            break;
        seen.add(next);
        cur = next;
    }
    return ok({ hops });
}