balena-cli/lib/drive/drive.coffee

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os = require('os')
fs = require('fs')
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path = require('path')
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_ = require('lodash-contrib')
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async = require('async')
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childProcess = require('child_process')
progressStream = require('progress-stream')
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IS_WINDOWS = os.platform() is 'win32'
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DISK_IO_FLAGS = 'rs+'
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exports.rescanDrives = (callback) ->
return callback() if not IS_WINDOWS
diskpartRescanScriptPath = path.join(__dirname, 'scripts', 'diskpart_rescan')
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childProcess.exec("diskpart /s \"#{diskpartRescanScriptPath}\"", {}, _.unary(callback))
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exports.eraseMBR = (devicePath, callback) ->
return callback() if not IS_WINDOWS
bufferSize = 512
async.waterfall([
(callback) ->
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fs.open(devicePath, DISK_IO_FLAGS, null, callback)
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(fd, callback) ->
buffer = new Buffer(bufferSize)
buffer.fill(0)
fs.write fd, buffer, 0, bufferSize, 0, (error, bytesWritten) ->
return callback(error) if error?
return callback(null, bytesWritten, fd)
(bytesWritten, fd, callback) ->
if bytesWritten isnt bufferSize
error = "Bytes written: #{bytesWritten}, expected #{bufferSize}"
return callback(error)
fs.close(fd, callback)
], callback)
exports.writeImage = (devicePath, imagePath, options = {}, callback = _.noop) ->
if not fs.existsSync(imagePath)
return callback(new Error("Invalid OS image: #{imagePath}"))
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if not IS_WINDOWS and not fs.existsSync(devicePath)
return callback(new Error("Invalid device: #{devicePath}"))
imageFileSize = fs.statSync(imagePath).size
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if imageFileSize is 0
return callback(new Error("Invalid OS image: #{imagePath}. The image is 0 bytes."))
progress = progressStream
length: imageFileSize
time: 500
if options.progress
progress.on('progress', options.onProgress)
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async.waterfall [
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(callback) ->
exports.eraseMBR(devicePath, callback)
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(callback) ->
exports.rescanDrives(callback)
(callback) ->
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deviceFileStream = fs.createWriteStream(devicePath, flags: DISK_IO_FLAGS)
deviceFileStream.on('error', callback)
imageFileStream = fs.createReadStream(imagePath)
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imageFileStream
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.pipe(progress)
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.pipe(deviceFileStream)
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# TODO: We should make use of nodewindows.elevate()
# if we get an EPERM error.
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.on('error', _.unary(callback))
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.on('close', _.unary(callback))
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(callback) ->
exports.rescanDrives(callback)
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], (error) ->
return callback() if not error?
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if error.code is 'EBUSY'
error.message = "Try umounting #{error.path} first."
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if error.code is 'ENOENT'
error.message = "Invalid device #{error.path}"
# Prevents outer handler to take
# it as an usual ENOENT error
delete error.code
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return callback(error)