@eighty4/c2/lib_js/attachments.js

Cross platform cloud config tooling for cloud-init

import { evalTemplateExpressions } from "./expression.js";
import { readDirListing, readToString } from "./fs.js";
export async function collectAttachments(dir) {
    const filenames = await readDirListing(dir);
    const attachments = await Promise.all(filenames.map(async (filename) => {
        const path = `${dir}/${filename}`;
        const source = await readToString(path);
        const type = resolveAttachmentType(filename, source);
        const content = await evalTemplateExpressions(source);
        return { content, filename, path, type, source };
    }));
    return attachments.sort(compareAttachmentFilenames);
}
function compareAttachmentFilenames(a1, a2) {
    if (a1.filename < a2.filename)
        return -1;
    if (a1.filename > a2.filename)
        return 1;
    return 0;
}
export function resolveAttachmentType(filename, source) {
    if (filename.endsWith('.yml') || filename.endsWith('.yaml')) {
        if (!source.trim().startsWith('#cloud-config')) {
            throw new Error('YAML cloud config must start with a #cloud-config comment');
        }
        return 'cloud-config';
    }
    else if (filename.endsWith('.sh')) {
        return 'x-shellscript';
    }
    else {
        throw new Error(`${filename} is an unsupported file type`);
    }
}