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replace.js
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'use strict' // tar -r const hlo = require('./high-level-opt.js') const Pack = require('./pack.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') 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 } } const h = new Header(headBuf) if (!h.cksumValid) { break } const 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 fs.close(fd, () => 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.slice(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.slice(1)), noResume: true, onentry: entry => p.add(entry), }).then(_ => addFilesAsync(p, files)) } else { p.add(file) } } p.end() }