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https://github.com/balena-io/etcher.git
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d8e31665a0
- Extend the `standard` ESLint configuration - Remove ESLint rules that are defined in the `standard` configuration - Get rid of semi-colons See: https://github.com/resin-io/etcher/pull/1657 Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>
126 lines
4.1 KiB
JavaScript
126 lines
4.1 KiB
JavaScript
/*
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* Copyright 2016 resin.io
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict'
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const imageWrite = require('etcher-image-write')
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const Bluebird = require('bluebird')
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const fs = Bluebird.promisifyAll(require('fs'))
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const mountutils = Bluebird.promisifyAll(require('mountutils'))
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const os = require('os')
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const imageStream = require('../image-stream')
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const errors = require('../shared/errors')
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const constraints = require('../shared/drive-constraints')
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/**
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* @summary Timeout, in milliseconds, to wait before unmounting on success
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* @constant
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* @type {Number}
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*/
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const UNMOUNT_ON_SUCCESS_TIMEOUT_MS = 2000
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/**
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* @summary Write an image to a disk drive
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* @function
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* @public
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*
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* @description
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* See https://github.com/resin-io-modules/etcher-image-write for information
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* about the `state` object passed to `onProgress` callback.
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*
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* @param {String} imagePath - path to image
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* @param {Object} drive - drive
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* @param {Object} options - options
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* @param {Boolean} [options.unmountOnSuccess=false] - unmount on success
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* @param {Boolean} [options.validateWriteOnSuccess=false] - validate write on success
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* @param {Function} onProgress - on progress callback (state)
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*
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* @fulfil {Boolean} - whether the operation was successful
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* @returns {Promise}
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*
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* @example
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* writer.writeImage('path/to/image.img', {
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* device: '/dev/disk2'
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* }, {
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* unmountOnSuccess: true,
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* validateWriteOnSuccess: true
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* }, (state) => {
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* console.log(state.percentage);
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* }).then(() => {
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* console.log('Done!');
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* });
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*/
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exports.writeImage = (imagePath, drive, options, onProgress) => {
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return Bluebird.try(() => {
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// Unmounting a drive in Windows means we can't write to it anymore
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if (os.platform() === 'win32') {
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return Bluebird.resolve()
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}
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return mountutils.unmountDiskAsync(drive.device)
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}).then(() => {
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return fs.openAsync(drive.raw, 'rs+')
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}).then((driveFileDescriptor) => {
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return imageStream.getFromFilePath(imagePath).then((image) => {
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if (!constraints.isDriveLargeEnough(drive, image)) {
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throw errors.createUserError({
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title: 'The image you selected is too big for this drive',
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description: 'Please connect a bigger drive and try again'
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})
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}
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return imageWrite.write({
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fd: driveFileDescriptor,
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device: drive.raw,
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size: drive.size
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}, {
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stream: image.stream,
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size: image.size.original
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}, {
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check: options.validateWriteOnSuccess,
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transform: image.transform,
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bmap: image.bmap,
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bytesToZeroOutFromTheBeginning: image.bytesToZeroOutFromTheBeginning
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})
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}).then((writer) => {
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return new Bluebird((resolve, reject) => {
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writer.on('progress', onProgress)
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writer.on('error', reject)
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writer.on('done', resolve)
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})
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}).tap(() => {
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// Make sure the device stream file descriptor is closed
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// before returning control the the caller. Not closing
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// the file descriptor (and waiting for it) results in
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// `EBUSY` errors when attempting to unmount the drive
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// right afterwards in some Windows 7 systems.
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return fs.closeAsync(driveFileDescriptor).then(() => {
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if (!options.unmountOnSuccess) {
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return Bluebird.resolve()
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}
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// Closing a file descriptor on a drive containing mountable
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// partitions causes macOS to mount the drive. If we try to
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// unmount to quickly, then the drive might get re-mounted
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// right afterwards.
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return Bluebird.delay(UNMOUNT_ON_SUCCESS_TIMEOUT_MS)
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.return(drive.device)
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.then(mountutils.unmountDiskAsync)
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})
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})
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})
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}
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