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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> replace.js
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict'
&nbsp;
// 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')
&nbsp;
// 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.
&nbsp;
const Header = require('./header.js')
&nbsp;
const r = module.exports = (opt_, files, cb) =&gt; {
 const opt = hlo(opt_)
&nbsp;
 if (!opt.file)
 throw new TypeError('file is required')
&nbsp;
 if (opt.gzip)
 throw new TypeError('cannot append to compressed archives')
&nbsp;
 if (!files || !Array.isArray(files) || !files.length)
 throw new TypeError('no files or directories specified')
&nbsp;
 files = Array.from(files)
&nbsp;
 return opt.sync ? replaceSync(opt, files)
 : replace(opt, files, cb)
}
&nbsp;
const replaceSync = (opt, files) =&gt; {
 const p = new Pack.Sync(opt)
&nbsp;
 let threw = true
 let fd
 let position
&nbsp;
 try {
 try {
 fd = fs.openSync(opt.file, 'r+')
 } catch (er) {
 if (er.code === 'ENOENT')
 fd = fs.openSync(opt.file, 'w+')
 else
 throw er
 }
&nbsp;
 const st = fs.fstatSync(fd)
 const headBuf = Buffer.alloc(512)
&nbsp;
 POSITION: for (position = 0; position &lt; st.size; position += 512) {
 for (let bufPos = 0, bytes = 0; bufPos &lt; 512; bufPos += bytes) {
 bytes = fs.readSync(
 fd, headBuf, bufPos, headBuf.length - bufPos, position + bufPos
 )
&nbsp;
 if (position === 0 &amp;&amp; headBuf[0] === 0x1f &amp;&amp; headBuf[1] === 0x8b)
 throw new Error('cannot append to compressed archives')
&nbsp;
 if (!bytes)
 break POSITION
 }
&nbsp;
 let h = new Header(headBuf)
 if (!h.cksumValid)
 break
 let entryBlockSize = 512 * Math.ceil(h.size / 512)
 if (position + entryBlockSize + 512 &gt; 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
&nbsp;
 streamSync(opt, p, position, fd, files)
 } finally {
 if (threw)
 try { fs.closeSync(fd) } catch (er) {}
 }
}
&nbsp;
const streamSync = (opt, p, position, fd, files) =&gt; {
 const stream = new fsm.WriteStreamSync(opt.file, {
 fd: fd,
 start: position
 })
 p.pipe(stream)
 addFilesSync(p, files)
}
&nbsp;
const replace = (opt, files, cb) =&gt; {
 files = Array.from(files)
 const p = new Pack(opt)
&nbsp;
 const getPos = (fd, size, cb_) =&gt; {
 const cb = (er, pos) =&gt; {
 if (er)
 fs.close(fd, _ =&gt; cb_(er))
 else
 cb_(null, pos)
 }
&nbsp;
 let position = 0
 if (size === 0)
 return cb(null, 0)
&nbsp;
 let bufPos = 0
 const headBuf = Buffer.alloc(512)
 const onread = (er, bytes) =&gt; {
 if (er)
 return cb(er)
 bufPos += bytes
 if (bufPos &lt; 512 &amp;&amp; bytes)
 return fs.read(
 fd, headBuf, bufPos, headBuf.length - bufPos,
 position + bufPos, onread
 )
&nbsp;
 if (position === 0 &amp;&amp; headBuf[0] === 0x1f &amp;&amp; headBuf[1] === 0x8b)
 return cb(new Error('cannot append to compressed archives'))
&nbsp;
 // truncated header
 if (bufPos &lt; 512)
 return cb(null, position)
&nbsp;
 const h = new Header(headBuf)
 if (!h.cksumValid)
 return cb(null, position)
&nbsp;
 const entryBlockSize = 512 * Math.ceil(h.size / 512)
 if (position + entryBlockSize + 512 &gt; size)
 return cb(null, position)
&nbsp;
 position += entryBlockSize + 512
 if (position &gt;= size)
 return cb(null, position)
&nbsp;
 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)
 }
&nbsp;
 const promise = new Promise((resolve, reject) =&gt; {
 p.on('error', reject)
 let flag = 'r+'
 const onopen = (er, fd) =&gt; {
 if (er &amp;&amp; er.code === 'ENOENT' &amp;&amp; flag === 'r+') {
 flag = 'w+'
 return fs.open(opt.file, flag, onopen)
 }
&nbsp;
 if (er)
 return reject(er)
&nbsp;
 fs.fstat(fd, (er, st) =&gt; {
 if (er)
 return reject(er)
 getPos(fd, st.size, (er, position) =&gt; {
 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)
 })
&nbsp;
 return cb ? promise.then(cb, cb) : promise
}
&nbsp;
const addFilesSync = (p, files) =&gt; {
 files.forEach(file =&gt; {
 if (file.charAt(0) === '@')
 t({
 file: path.resolve(p.cwd, file.substr(1)),
 sync: true,
 noResume: true,
 onentry: entry =&gt; p.add(entry)
 })
 else
 p.add(file)
 })
 p.end()
}
&nbsp;
const addFilesAsync = (p, files) =&gt; {
 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 =&gt; p.add(entry)
 }).then(_ =&gt; addFilesAsync(p, files))
 else
 p.add(file)
 }
 p.end()
}
&nbsp;</pre></td></tr>
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 Code coverage
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