@struktoai/mirage-core/dist/core/ram/rename.js

A Unified Virtual Filesystem For AI Agents

// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
import { nowIso } from "../../utils/dates.js";
import { norm } from "../../utils/path.js";
import { rstripSlash } from "../../utils/slash.js";
import { fsError } from "../../errors/fs.js";
import { activePipe } from "../dev/device.js";
import { checkDestParents, checkRename, lookupError } from "./dest.js";
function moveAttrs(accessor, src, dst) {
    const attrs = accessor.store.attrs.get(src);
    if (attrs !== undefined) {
        accessor.store.attrs.delete(src);
        accessor.store.attrs.set(dst, attrs);
    }
}
// Re-key every descendant of a renamed directory. A synthetic-directory
// store keeps subdirectories as entries of their own, so moving only the
// files leaves those behind. The phantom tree the orphans imply makes the
// old name reappear in its parent's listing and then stat as missing --
// the same shape checkDestParents refuses on the way in.
function moveSubtree(accessor, s, d) {
    const srcPrefix = `${rstripSlash(s)}/`;
    const dstPrefix = `${rstripSlash(d)}/`;
    const { store } = accessor;
    for (const key of [...store.dirs]) {
        if (!key.startsWith(srcPrefix))
            continue;
        store.dirs.delete(key);
        store.dirs.add(dstPrefix + key.slice(srcPrefix.length));
    }
    for (const key of [...store.files.keys()]) {
        if (!key.startsWith(srcPrefix))
            continue;
        const data = store.files.get(key);
        if (data !== undefined) {
            store.files.set(dstPrefix + key.slice(srcPrefix.length), data);
            store.files.delete(key);
        }
    }
    for (const key of [...store.modified.keys()]) {
        if (!key.startsWith(srcPrefix))
            continue;
        const mod = store.modified.get(key);
        if (mod !== undefined) {
            store.modified.set(dstPrefix + key.slice(srcPrefix.length), mod);
            store.modified.delete(key);
        }
    }
    for (const key of [...store.attrs.keys()]) {
        if (!key.startsWith(srcPrefix))
            continue;
        moveAttrs(accessor, key, dstPrefix + key.slice(srcPrefix.length));
    }
}
/**
 * Move one key, a directory with its subtree. A live descriptor at either
 * end is the shell's to release, so moving one or over one is EPERM (GNU:
 * `mv /dev/fd/63 /dev/fd/62` is "Operation not permitted"). Mirrors
 * Python's rename.
 */
export async function rename(accessor, src, dst) {
    const s = norm(src.mountPath);
    const d = norm(dst.mountPath);
    if (activePipe(accessor, s) !== null)
        throw fsError(src, 'EPERM');
    if (activePipe(accessor, d) !== null)
        throw fsError(dst, 'EPERM');
    const now = nowIso();
    checkDestParents(accessor, dst, d);
    // rename(2) onto its own name succeeds and changes nothing; moving the
    // key onto itself would delete it, and a directory's whole subtree.
    if (s === d) {
        if (accessor.store.files.has(s) || accessor.store.dirs.has(s))
            return;
        throw lookupError(accessor, src, s);
    }
    checkRename(accessor, src, s, dst, d);
    const srcFile = accessor.store.files.get(s);
    if (srcFile !== undefined) {
        accessor.store.files.set(d, srcFile);
        accessor.store.files.delete(s);
        accessor.store.modified.set(d, accessor.store.modified.get(s) ?? now);
        accessor.store.modified.delete(s);
        moveAttrs(accessor, s, d);
        // A file has nothing beneath it: both ends take the unlink flavor.
        return Promise.resolve();
    }
    if (accessor.store.dirs.has(s)) {
        accessor.store.dirs.delete(s);
        accessor.store.dirs.add(d);
        accessor.store.modified.set(d, accessor.store.modified.get(s) ?? now);
        accessor.store.modified.delete(s);
        moveAttrs(accessor, s, d);
        moveSubtree(accessor, s, d);
        return Promise.resolve();
    }
    throw lookupError(accessor, src, s);
}
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