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pirannapiranna
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Put basic environment on it's own file
1 parent bd4fa38 commit 4d21071

4 files changed

Lines changed: 199 additions & 183 deletions

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‎lib/basicEnvironment.js‎

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const symlink = require('fs').symlink
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const eachOf = require('async/eachOf')
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const mkdirp = require('mkdirp')
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const rimraf = require('rimraf').sync
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function basicEnvironment(callback)
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{
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// Change umask system wide so new files are accesible ONLY by its owner
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process.umask(0066)
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// Remove from initramfs the files only needed on boot to free memory
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rimraf('/bin/nodeos-mount-filesystems')
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rimraf('/init')
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rimraf('/lib/node_modules/nodeos-mount-filesystems')
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rimraf('/sbin')
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// Symlinks for config data optained from `procfs`
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mkdirp('/etc', '0100', function(error)
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{
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if(error && error.code !== 'EEXIST') return callback(error)
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const symlinks =
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{
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'/proc/mounts': '/etc/mtab',
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'/proc/net/pnp': '/etc/resolv.conf'
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}
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eachOf(symlinks, function(dest, src, callback)
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{
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symlink(src, dest, function(error)
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{
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if(error && error.code !== 'EEXIST') return callback(error)
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callback()
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})
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},
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function(error)
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{
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if(error) return callback(error)
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// Update environment variables
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var env = process.env
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delete env['vga']
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env['NODE_PATH'] = '/lib/node_modules'
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callback()
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})
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})
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}
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module.exports = basicEnvironment

‎lib/index.js‎

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const fs = require('fs')
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const resolve = require('path').resolve
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const prompt = require('prompt')
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const utils = require('nodeos-mount-utils')
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const prepareSessions = require('./sessions')
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const flags = utils.flags
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const MS_NODEV = flags.MS_NODEV
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const MS_NOSUID = flags.MS_NOSUID
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const MOUNTPOINT = '/tmp'
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/**
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* This error handler traces the error and starts a node.js repl
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* @access private
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* @param {Error} error The error that gets traced
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*/
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function onerror(error)
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{
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console.trace(error)
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utils.startRepl('NodeOS-mount-filesystems')
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}
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/**
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* This helper waits with a limit of tries until the path exists
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* @access private
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* @param {String} path The path to check for
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* @param {Number} tries A limit of tries
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* @param {Function} callback The callback function
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* @return {Function} Returns the callback with either nothing
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* or with a error
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*/
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function waitUntilExists(path, tries, callback)
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{
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fs.exists(path, function(exists)
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{
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if(exists) return callback()
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if(tries-- <= 0) return callback(new Error(path+' not exists'))
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setTimeout(waitUntilExists, 1000, path, tries, callback)
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})
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}
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/**
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* Starts a prompt and asks for the location of the userfs
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* @access private
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* @param {Error} error The error will be printed in the console
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*/
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function askLocation(error)
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{
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console.warn('Could not find userfs:', error)
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var self = this
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prompt.start()
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prompt.get('path to userfs', function(error, result)
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{
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if(error) console.warn(error)
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self.root = result['path to userfs']
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return mountUsersFS(self)
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})
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}
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//
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// Public API
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//
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/**
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* This function mounts the userfs
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* if the root env variable contains `container` it prepares the session
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* and if there is no root env var then it awaits the user device and
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* then mounts the user device and then prepares the session
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* @access private
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* @param {Object} cmdline This objects holds key/value pairs from the
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* `/proc/cmdline` file
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* @return {Prompt|Error} It returns either a prompt if the
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* tries has reached its limit or a error
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* if the `mkdirMount` fails to create the user
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* device
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*/
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function mountUsersFS(cmdline)
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{
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function done(error)
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{
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if(error) onerror(error)
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}
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const single = cmdline.single
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var env = process.env
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// Allow to override or disable `usersDev`
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var usersDev = env['root']
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if(usersDev === undefined) usersDev = cmdline.root
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// Running on a container (Docker, vagga), don't mount the users filesystem
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if(usersDev === 'container') return prepareSessions(MOUNTPOINT, single, done)
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// Running on real hardware or virtual machine, mount the users filesystem
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if(usersDev)
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waitUntilExists(usersDev, 5, function(error)
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{
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if(error) return askLocation.call(cmdline, error)
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// Mount users filesystem
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var type = env['rootfstype'] || cmdline.rootfstype || 'auto'
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var extras = {errors: 'remount-ro', devFile: resolve(usersDev)}
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utils.mkdirMount(MOUNTPOINT, type, MS_NODEV | MS_NOSUID, extras, function(error)
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{
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if(error) return onerror(error)
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delete env['root']
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delete env['rootfstype']
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prepareSessions(MOUNTPOINT, single, done)
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})
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})
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// Users filesystem is not defined, launch a Node.js REPL
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else
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fs.readFile('resources/readonly_warning.txt', 'utf8', function(error, data)
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{
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if(error) return onerror(error)
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console.warn(data)
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utils.startRepl('NodeOS-mount-filesystems')
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})
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}
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module.exports = mountUsersFS
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exports.basicEnvironment = require('./basicEnvironment')
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exports.mountUsersFS = require('./mountUsersFS')
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exports.prepareSessions = require('./prepareSessions')

‎lib/mountUsersFS.js‎

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const fs = require('fs')
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const resolve = require('path').resolve
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const prompt = require('prompt')
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const utils = require('nodeos-mount-utils')
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const flags = utils.flags
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const MS_NODEV = flags.MS_NODEV
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const MS_NOSUID = flags.MS_NOSUID
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/**
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* This helper waits with a limit of tries until the path exists
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* @access private
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* @param {String} path The path to check for
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* @param {Number} tries A limit of tries
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* @param {Function} callback The callback function
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* @return {Function} Returns the callback with either nothing
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* or with a error
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*/
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function waitUntilExists(path, tries, callback)
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{
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fs.exists(path, function(exists)
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{
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if(exists) return callback()
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if(tries-- <= 0) return callback(new Error(path+' not exists'))
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setTimeout(waitUntilExists, 1000, path, tries, callback)
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})
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}
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/**
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* Starts a prompt and asks for the location of the userfs
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* @access private
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* @param {Error} error The error will be printed in the console
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*/
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function askLocation(mountpoint, cmdline, error, callback)
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{
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console.warn('Could not find userfs:', error)
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prompt.start()
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prompt.get('path to userfs', function(error, result)
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{
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if(error) console.warn(error)
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cmdline.root = result['path to userfs']
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return mountUsersFS(mountpoint, cmdline, callback)
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})
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}
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//
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// Public API
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//
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/**
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* This function mounts the userfs
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* if the root env variable contains `container` it prepares the session
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* and if there is no root env var then it awaits the user device and
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* then mounts the user device and then prepares the session
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* @access private
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* @param {Object} cmdline This objects holds key/value pairs from the
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* `/proc/cmdline` file
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* @return {Prompt|Error} It returns either a prompt if the
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* tries has reached its limit or a error
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* if the `mkdirMount` fails to create the user
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* device
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*/
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function mountUsersFS(mountpoint, cmdline, callback)
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{
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// Get filesystem location & type and clean their environment variables
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var env = process.env
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var usersDev = env['root']
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var type = env['rootfstype'] || cmdline.rootfstype || 'auto'
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delete env['root']
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delete env['rootfstype']
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// Allow to override or disable `usersDev`
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if(usersDev === undefined) usersDev = cmdline.root
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// Running on a container (Docker, vagga), don't mount the users filesystem
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if(usersDev === 'container') return callback()
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// Running on real hardware or virtual machine, mount the users filesystem
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if(usersDev)
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return waitUntilExists(usersDev, 5, function(error)
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{
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if(error) return askLocation(mountpoint, cmdline, error, callback)
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// Mount users filesystem
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var extras = {errors: 'remount-ro', devFile: resolve(usersDev)}
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utils.mkdirMount(mountpoint, type, MS_NODEV | MS_NOSUID, extras, callback)
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})
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// Users filesystem is not defined, launch a Node.js REPL
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fs.readFile(`${__dirname}/../resources/readonly_warning.txt`, 'utf8',
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function(error, data)
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{
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if(error) return callback(error)
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console.warn(data)
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utils.startRepl('NodeOS-mount-filesystems')
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})
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}
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module.exports = mountUsersFS

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