@struktoai/mirage-core/dist/core/gdrive/truncate.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 { eisdir, enotsup } from "../../errors/fs.js";
import { FileType } from "../../types.js";
import { NATIVE_RESOURCE_TYPES } from "./fingerprint.js";
import { liveRow } from "./readdir.js";
import { eaccesOnDenied } from "./resolve.js";
import { write } from "./write.js";
export const truncate = eaccesOnDenied(async function (accessor, path, length, noCreate = false, handed = {}) {
    if (noCreate)
        throw enotsup('gdrive', 'truncate --no-create', path);
    const entry = await liveRow(accessor, path, handed.entry);
    if (entry !== null && entry.type === FileType.DIRECTORY)
        throw eisdir(path);
    let data;
    if (entry === null || NATIVE_RESOURCE_TYPES.has(entry.extra.resource_type)) {
        data = new Uint8Array(0);
    }
    else {
        data = await accessor.drive.downloadFile(entry.extra.file_id);
    }
    let out;
    if (length <= data.length) {
        out = data.slice(0, length);
    }
    else {
        out = new Uint8Array(length);
        out.set(data, 0);
    }
    await write(accessor, path, out, { ...handed, entry });
});
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