187 lines
8.1 KiB
JavaScript
187 lines
8.1 KiB
JavaScript
'use strict';
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exports = module.exports = {
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isMountProvider,
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tryAddMount,
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removeMount,
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validateMountOptions,
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getStatus,
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};
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const assert = require('assert'),
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BoxError = require('./boxerror.js'),
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constants = require('./constants.js'),
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debug = require('debug')('box:mounts'),
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ejs = require('ejs'),
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fs = require('fs'),
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path = require('path'),
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paths = require('./paths.js'),
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safe = require('safetydance'),
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shell = require('./shell.js');
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const ADD_MOUNT_CMD = path.join(__dirname, 'scripts/addmount.sh');
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const RM_MOUNT_CMD = path.join(__dirname, 'scripts/rmmount.sh');
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const SYSTEMD_MOUNT_EJS = fs.readFileSync(path.join(__dirname, 'systemd-mount.ejs'), { encoding: 'utf8' });
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// https://man7.org/linux/man-pages/man8/mount.8.html
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function validateMountOptions(type, options) {
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assert.strictEqual(typeof type, 'string');
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assert.strictEqual(typeof options, 'object');
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switch (type) {
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case 'filesystem':
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case 'mountpoint':
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return null;
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case 'cifs':
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if (typeof options.username !== 'string') return new BoxError(BoxError.BAD_FIELD, 'username is not a string');
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if (typeof options.password !== 'string') return new BoxError(BoxError.BAD_FIELD, 'password is not a string');
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if (typeof options.host !== 'string') return new BoxError(BoxError.BAD_FIELD, 'host is not a string');
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if (typeof options.remoteDir !== 'string') return new BoxError(BoxError.BAD_FIELD, 'remoteDir is not a string');
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return null;
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case 'nfs':
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if (typeof options.host !== 'string') return new BoxError(BoxError.BAD_FIELD, 'host is not a string');
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if (typeof options.remoteDir !== 'string') return new BoxError(BoxError.BAD_FIELD, 'remoteDir is not a string');
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return null;
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case 'sshfs':
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if (typeof options.user !== 'string') return new BoxError(BoxError.BAD_FIELD, 'user is not a string');
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if (typeof options.privateKey !== 'string') return new BoxError(BoxError.BAD_FIELD, 'privateKey is not a string');
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if (typeof options.port !== 'number') return new BoxError(BoxError.BAD_FIELD, 'port is not a number');
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if (typeof options.host !== 'string') return new BoxError(BoxError.BAD_FIELD, 'host is not a string');
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if (typeof options.remoteDir !== 'string') return new BoxError(BoxError.BAD_FIELD, 'remoteDir is not a string');
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return null;
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case 'ext4':
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if (typeof options.diskPath !== 'string') return new BoxError(BoxError.BAD_FIELD, 'diskPath is not a string');
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return null;
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default:
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return new BoxError(BoxError.BAD_FIELD, 'Bad mount type');
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}
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}
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function isMountProvider(provider) {
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return provider === 'sshfs' || provider === 'cifs' || provider === 'nfs' || provider === 'ext4';
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}
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// https://www.man7.org/linux/man-pages/man8/mount.8.html for various mount option flags
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// nfs - no_root_squash is mode on server to map all root to 'nobody' user. all_squash does this for all users (making it like ftp)
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// sshfs - supports users/permissions
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// cifs - does not support permissions
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function renderMountFile(mount) {
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assert.strictEqual(typeof mount, 'object');
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const {name, hostPath, mountType, mountOptions} = mount;
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let options, what, type;
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switch (mountType) {
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case 'cifs':
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type = 'cifs';
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what = `//${mountOptions.host}` + path.join('/', mountOptions.remoteDir);
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options = `username=${mountOptions.username},password=${mountOptions.password},rw,iocharset=utf8,file_mode=0666,dir_mode=0777,uid=yellowtent,gid=yellowtent`;
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break;
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case 'nfs':
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type = 'nfs';
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what = `${mountOptions.host}:${mountOptions.remoteDir}`;
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options = 'noauto'; // noauto means it is not a blocker for local-fs.target. _netdev is implicit. rw,hard,tcp,rsize=8192,wsize=8192,timeo=14
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break;
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case 'ext4':
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type = 'ext4';
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what = mountOptions.diskPath; // like /dev/disk/by-uuid/uuid or /dev/disk/by-id/scsi-id
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options = 'discard,defaults,noatime';
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break;
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case 'sshfs': {
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const keyFilePath = path.join(paths.SSHFS_KEYS_DIR, `id_rsa_${mountOptions.host}`);
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type = 'fuse.sshfs';
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what = `${mountOptions.user}@${mountOptions.host}:${mountOptions.remoteDir}`;
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options = `allow_other,port=${mountOptions.port},IdentityFile=${keyFilePath},StrictHostKeyChecking=no,reconnect`; // allow_other means non-root users can access it
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break;
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}
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case 'filesystem':
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case 'mountpoint':
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return;
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}
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return ejs.render(SYSTEMD_MOUNT_EJS, { name, what, where: hostPath, options, type });
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}
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async function removeMount(mount) {
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assert.strictEqual(typeof mount, 'object');
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const { hostPath, mountType, mountOptions } = mount;
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if (constants.TEST) return;
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await safe(shell.promises.sudo('removeMount', [ RM_MOUNT_CMD, hostPath ], {}), { debug }); // ignore any error
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if (mountType === 'sshfs') {
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const keyFilePath = path.join(paths.SSHFS_KEYS_DIR, `id_rsa_${mountOptions.host}`);
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safe.fs.unlinkSync(keyFilePath);
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}
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}
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async function getStatus(mountType, hostPath) {
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assert.strictEqual(typeof mountType, 'string');
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assert.strictEqual(typeof hostPath, 'string');
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if (mountType === 'filesystem') return { state: 'active', message: 'Mounted' };
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const state = safe.child_process.execSync(`mountpoint -q -- ${hostPath}`) ? 'active' : 'inactive';
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if (mountType === 'mountpoint') return { state, message: state === 'active' ? 'Mounted' : 'Not mounted' };
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// we used to rely on "systemctl show -p ActiveState" output before but some mounts like sshfs.fuse show the status as "active" event though the mount commant failed (on ubuntu 18)
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let message;
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if (state !== 'active') { // find why it failed
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const logsJson = safe.child_process.execSync(`journalctl -u $(systemd-escape -p --suffix=mount ${hostPath}) -n 10 --no-pager -o json`, { encoding: 'utf8' });
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if (logsJson) {
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const lines = logsJson.trim().split('\n').map(l => JSON.parse(l)); // array of json
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let start = -1, end = -1; // start and end of error message block
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for (let idx = lines.length - 1; idx >= 0; idx--) { // reverse
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const line = lines[idx];
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const match = line['SYSLOG_IDENTIFIER'] === 'mount' || line['_EXE'].includes('mount') || line['_COMM'].includes('mount');
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if (match) {
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if (end === -1) end = idx;
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start = idx;
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continue;
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}
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if (end !== -1) break; // no match and we already found a block
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}
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if (end !== -1) message = lines.slice(start, end+1).map(line => line['MESSAGE']).join('\n');
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}
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if (!message) message = `Could not determine failure reason. ${safe.error ? safe.error.message : ''}`;
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} else {
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message = 'Mounted';
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}
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return { state, message };
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}
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async function tryAddMount(mount, options) {
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assert.strictEqual(typeof mount, 'object'); // { name, hostPath, mountType, mountOptions }
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assert.strictEqual(typeof options, 'object'); // { timeout, skipCleanup }
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if (mount.mountType === 'mountpoint') return;
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if (constants.TEST) return;
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if (mount.mountType === 'sshfs') {
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const keyFilePath = path.join(paths.SSHFS_KEYS_DIR, `id_rsa_${mount.mountOptions.host}`);
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safe.fs.mkdirSync(paths.SSHFS_KEYS_DIR);
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if (!safe.fs.writeFileSync(keyFilePath, `${mount.mountOptions.privateKey}\n`, { mode: 0o600 })) throw new BoxError(BoxError.FS_ERROR, safe.error);
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}
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const [error] = await safe(shell.promises.sudo('addMount', [ ADD_MOUNT_CMD, renderMountFile(mount), options.timeout ], {}));
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if (error && error.code === 2) throw new BoxError(BoxError.MOUNT_ERROR, 'Failed to unmount existing mount'); // at this point, the old mount config is still there
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if (options.skipCleanup) return;
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const status = await getStatus(mount.mountType, mount.hostPath);
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if (status.state !== 'active') { // cleanup
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await removeMount(mount);
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throw new BoxError(BoxError.MOUNT_ERROR, `Failed to mount (${status.state}): ${status.message}`);
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}
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}
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