# All files / tar/lib replace.js

100% Statements 131/131
100% Branches 70/70
100% Functions 18/18
100% Lines 128/128

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     'use strict'

    // 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()
    }