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Edit File : replace.js \| Size : 5.36 KB
'use strict' const Buffer = require('./buffer.js') // tar -r const hlo = require('./high-level-opt.js') const Pack = require('./pack.js') const Parse = require('./parse.js') const fs = require('fs') const fsm = require('fs-minipass') const t = require('./list.js') const path = require('path') // starting at the head of the file, read a Header // If the checksum is invalid, that's our position to start writing // If it is, jump forward by the specified size (round up to 512) // and try again. // Write the new Pack stream starting there. const Header = require('./header.js') const r = module.exports = (opt_, files, cb) => { const opt = hlo(opt_) if (!opt.file) throw new TypeError('file is required') if (opt.gzip) throw new TypeError('cannot append to compressed archives') if (!files \|\| !Array.isArray(files) \|\| !files.length) throw new TypeError('no files or directories specified') files = Array.from(files) return opt.sync ? replaceSync(opt, files) : replace(opt, files, cb) } const replaceSync = (opt, files) => { const p = new Pack.Sync(opt) let threw = true let fd let position try { try { fd = fs.openSync(opt.file, 'r+') } catch (er) { if (er.code === 'ENOENT') fd = fs.openSync(opt.file, 'w+') else throw er } const st = fs.fstatSync(fd) const headBuf = Buffer.alloc(512) POSITION: for (position = 0; position < st.size; position += 512) { for (let bufPos = 0, bytes = 0; bufPos < 512; bufPos += bytes) { bytes = fs.readSync( fd, headBuf, bufPos, headBuf.length - bufPos, position + bufPos ) if (position === 0 && headBuf[0] === 0x1f && headBuf[1] === 0x8b) throw new Error('cannot append to compressed archives') if (!bytes) break POSITION } let h = new Header(headBuf) if (!h.cksumValid) break let entryBlockSize = 512 * Math.ceil(h.size / 512) if (position + entryBlockSize + 512 > st.size) break // the 512 for the header we just parsed will be added as well // also jump ahead all the blocks for the body position += entryBlockSize if (opt.mtimeCache) opt.mtimeCache.set(h.path, h.mtime) } threw = false streamSync(opt, p, position, fd, files) } finally { if (threw) try { fs.closeSync(fd) } catch (er) {} } } const streamSync = (opt, p, position, fd, files) => { const stream = new fsm.WriteStreamSync(opt.file, { fd: fd, start: position }) p.pipe(stream) addFilesSync(p, files) } const replace = (opt, files, cb) => { files = Array.from(files) const p = new Pack(opt) const getPos = (fd, size, cb_) => { const cb = (er, pos) => { if (er) fs.close(fd, _ => cb_(er)) else cb_(null, pos) } let position = 0 if (size === 0) return cb(null, 0) let bufPos = 0 const headBuf = Buffer.alloc(512) const onread = (er, bytes) => { if (er) return cb(er) bufPos += bytes if (bufPos < 512 && bytes) return fs.read( fd, headBuf, bufPos, headBuf.length - bufPos, position + bufPos, onread ) if (position === 0 && headBuf[0] === 0x1f && headBuf[1] === 0x8b) return cb(new Error('cannot append to compressed archives')) // truncated header if (bufPos < 512) return cb(null, position) const h = new Header(headBuf) if (!h.cksumValid) return cb(null, position) const entryBlockSize = 512 * Math.ceil(h.size / 512) if (position + entryBlockSize + 512 > size) return cb(null, position) position += entryBlockSize + 512 if (position >= size) return cb(null, position) if (opt.mtimeCache) opt.mtimeCache.set(h.path, h.mtime) bufPos = 0 fs.read(fd, headBuf, 0, 512, position, onread) } fs.read(fd, headBuf, 0, 512, position, onread) } const promise = new Promise((resolve, reject) => { p.on('error', reject) let flag = 'r+' const onopen = (er, fd) => { if (er && er.code === 'ENOENT' && flag === 'r+') { flag = 'w+' return fs.open(opt.file, flag, onopen) } if (er) return reject(er) fs.fstat(fd, (er, st) => { if (er) return reject(er) getPos(fd, st.size, (er, position) => { if (er) return reject(er) const stream = new fsm.WriteStream(opt.file, { fd: fd, start: position }) p.pipe(stream) stream.on('error', reject) stream.on('close', resolve) addFilesAsync(p, files) }) }) } fs.open(opt.file, flag, onopen) }) return cb ? promise.then(cb, cb) : promise } const addFilesSync = (p, files) => { files.forEach(file => { if (file.charAt(0) === '@') t({ file: path.resolve(p.cwd, file.substr(1)), sync: true, noResume: true, onentry: entry => p.add(entry) }) else p.add(file) }) p.end() } const addFilesAsync = (p, files) => { while (files.length) { const file = files.shift() if (file.charAt(0) === '@') return t({ file: path.resolve(p.cwd, file.substr(1)), noResume: true, onentry: entry => p.add(entry) }).then(_ => addFilesAsync(p, files)) else p.add(file) } p.end() } Back

Edit File : replace.js | Size : 5.36 KB

'use strict'
const Buffer = require('./buffer.js')

// tar -r
const hlo = require('./high-level-opt.js')
const Pack = require('./pack.js')
const Parse = require('./parse.js')
const fs = require('fs')
const fsm = require('fs-minipass')
const t = require('./list.js')
const path = require('path')

// starting at the head of the file, read a Header
// If the checksum is invalid, that's our position to start writing
// If it is, jump forward by the specified size (round up to 512)
// and try again.
// Write the new Pack stream starting there.

const Header = require('./header.js')

const r = module.exports = (opt_, files, cb) => {
  const opt = hlo(opt_)

if (!opt.file)
    throw new TypeError('file is required')

if (opt.gzip)
    throw new TypeError('cannot append to compressed archives')

if (!files || !Array.isArray(files) || !files.length)
    throw new TypeError('no files or directories specified')

files = Array.from(files)

return opt.sync ? replaceSync(opt, files)
    : replace(opt, files, cb)
}

const replaceSync = (opt, files) => {
  const p = new Pack.Sync(opt)

let threw = true
  let fd
  let position

try {
    try {
      fd = fs.openSync(opt.file, 'r+')
    } catch (er) {
      if (er.code === 'ENOENT')
        fd = fs.openSync(opt.file, 'w+')
      else
        throw er
    }

const st = fs.fstatSync(fd)
    const headBuf = Buffer.alloc(512)

POSITION: for (position = 0; position < st.size; position += 512) {
      for (let bufPos = 0, bytes = 0; bufPos < 512; bufPos += bytes) {
        bytes = fs.readSync(
          fd, headBuf, bufPos, headBuf.length - bufPos, position + bufPos
        )

if (position === 0 && headBuf[0] === 0x1f && headBuf[1] === 0x8b)
          throw new Error('cannot append to compressed archives')

if (!bytes)
          break POSITION
      }

let h = new Header(headBuf)
      if (!h.cksumValid)
        break
      let entryBlockSize = 512 * Math.ceil(h.size / 512)
      if (position + entryBlockSize + 512 > st.size)
        break
      // the 512 for the header we just parsed will be added as well
      // also jump ahead all the blocks for the body
      position += entryBlockSize
      if (opt.mtimeCache)
        opt.mtimeCache.set(h.path, h.mtime)
    }
    threw = false

streamSync(opt, p, position, fd, files)
  } finally {
    if (threw)
      try { fs.closeSync(fd) } catch (er) {}
  }
}

const streamSync = (opt, p, position, fd, files) => {
  const stream = new fsm.WriteStreamSync(opt.file, {
    fd: fd,
    start: position
  })
  p.pipe(stream)
  addFilesSync(p, files)
}

const replace = (opt, files, cb) => {
  files = Array.from(files)
  const p = new Pack(opt)

const getPos = (fd, size, cb_) => {
    const cb = (er, pos) => {
      if (er)
        fs.close(fd, _ => cb_(er))
      else
        cb_(null, pos)
    }

let position = 0
    if (size === 0)
      return cb(null, 0)

let bufPos = 0
    const headBuf = Buffer.alloc(512)
    const onread = (er, bytes) => {
      if (er)
        return cb(er)
      bufPos += bytes
      if (bufPos < 512 && bytes)
        return fs.read(
          fd, headBuf, bufPos, headBuf.length - bufPos,
          position + bufPos, onread
        )

if (position === 0 && headBuf[0] === 0x1f && headBuf[1] === 0x8b)
        return cb(new Error('cannot append to compressed archives'))

// truncated header
      if (bufPos < 512)
        return cb(null, position)

const h = new Header(headBuf)
      if (!h.cksumValid)
        return cb(null, position)

const entryBlockSize = 512 * Math.ceil(h.size / 512)
      if (position + entryBlockSize + 512 > size)
        return cb(null, position)

position += entryBlockSize + 512
      if (position >= size)
        return cb(null, position)

if (opt.mtimeCache)
        opt.mtimeCache.set(h.path, h.mtime)
      bufPos = 0
      fs.read(fd, headBuf, 0, 512, position, onread)
    }
    fs.read(fd, headBuf, 0, 512, position, onread)
  }

const promise = new Promise((resolve, reject) => {
    p.on('error', reject)
    let flag = 'r+'
    const onopen = (er, fd) => {
      if (er && er.code === 'ENOENT' && flag === 'r+') {
        flag = 'w+'
        return fs.open(opt.file, flag, onopen)
      }

if (er)
        return reject(er)

fs.fstat(fd, (er, st) => {
        if (er)
          return reject(er)
        getPos(fd, st.size, (er, position) => {
          if (er)
            return reject(er)
          const stream = new fsm.WriteStream(opt.file, {
            fd: fd,
            start: position
          })
          p.pipe(stream)
          stream.on('error', reject)
          stream.on('close', resolve)
          addFilesAsync(p, files)
        })
      })
    }
    fs.open(opt.file, flag, onopen)
  })

return cb ? promise.then(cb, cb) : promise
}

const addFilesSync = (p, files) => {
  files.forEach(file => {
    if (file.charAt(0) === '@')
      t({
        file: path.resolve(p.cwd, file.substr(1)),
        sync: true,
        noResume: true,
        onentry: entry => p.add(entry)
      })
    else
      p.add(file)
  })
  p.end()
}

const addFilesAsync = (p, files) => {
  while (files.length) {
    const file = files.shift()
    if (file.charAt(0) === '@')
      return t({
        file: path.resolve(p.cwd, file.substr(1)),
        noResume: true,
        onentry: entry => p.add(entry)
      }).then(_ => addFilesAsync(p, files))
    else
      p.add(file)
  }
  p.end()
}

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