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index.js
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index.js
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var chownr = require('chownr')
var tar = require('tar-stream')
var pump = require('pump')
var mkdirp = require('mkdirp')
var fs = require('fs')
var path = require('path')
var os = require('os')
var win32 = os.platform() === 'win32'
var noop = function () {}
var echo = function (name) {
return name
}
var normalize = !win32 ? echo : function (name) {
return name.replace(/\\/g, '/').replace(/[:?<>|]/g, '_')
}
var statAll = function (fs, stat, cwd, ignore, entries, sort) {
var queue = entries || ['.']
return function loop (callback) {
if (!queue.length) return callback()
var next = queue.shift()
var nextAbs = path.join(cwd, next)
stat(nextAbs, function (err, stat) {
if (err) return callback(err)
if (!stat.isDirectory()) return callback(null, next, stat)
fs.readdir(nextAbs, function (err, files) {
if (err) return callback(err)
if (sort) files.sort()
for (var i = 0; i < files.length; i++) {
if (!ignore(path.join(cwd, next, files[i]))) queue.push(path.join(next, files[i]))
}
callback(null, next, stat)
})
})
}
}
var strip = function (map, level) {
return function (header) {
header.name = header.name.split('/').slice(level).join('/')
var linkname = header.linkname
if (linkname && (header.type === 'link' || path.isAbsolute(linkname))) {
header.linkname = linkname.split('/').slice(level).join('/')
}
return map(header)
}
}
exports.pack = function (cwd, opts) {
if (!cwd) cwd = '.'
if (!opts) opts = {}
var xfs = opts.fs || fs
var ignore = opts.ignore || opts.filter || noop
var map = opts.map || noop
var mapStream = opts.mapStream || echo
var statNext = statAll(xfs, opts.dereference ? xfs.stat : xfs.lstat, cwd, ignore, opts.entries, opts.sort)
var strict = opts.strict !== false
var umask = typeof opts.umask === 'number' ? ~opts.umask : ~processUmask()
var dmode = typeof opts.dmode === 'number' ? opts.dmode : 0
var fmode = typeof opts.fmode === 'number' ? opts.fmode : 0
var pack = opts.pack || tar.pack()
var finish = opts.finish || noop
if (opts.strip) map = strip(map, opts.strip)
if (opts.readable) {
dmode |= parseInt(555, 8)
fmode |= parseInt(444, 8)
}
if (opts.writable) {
dmode |= parseInt(333, 8)
fmode |= parseInt(222, 8)
}
var onsymlink = function (filename, header) {
xfs.readlink(path.join(cwd, filename), function (err, linkname) {
if (err) return pack.destroy(err)
header.linkname = normalize(linkname)
pack.entry(header, onnextentry)
})
}
var onstat = function (err, filename, stat) {
if (err) return pack.destroy(err)
if (!filename) {
if (opts.finalize !== false) pack.finalize()
return finish(pack)
}
if (stat.isSocket()) return onnextentry() // tar does not support sockets...
var header = {
name: normalize(filename),
mode: (stat.mode | (stat.isDirectory() ? dmode : fmode)) & umask,
mtime: stat.mtime,
size: stat.size,
type: 'file',
uid: stat.uid,
gid: stat.gid
}
if (stat.isDirectory()) {
header.size = 0
header.type = 'directory'
header = map(header) || header
return pack.entry(header, onnextentry)
}
if (stat.isSymbolicLink()) {
header.size = 0
header.type = 'symlink'
header = map(header) || header
return onsymlink(filename, header)
}
// TODO: add fifo etc...
header = map(header) || header
if (!stat.isFile()) {
if (strict) return pack.destroy(new Error('unsupported type for ' + filename))
return onnextentry()
}
var entry = pack.entry(header, onnextentry)
if (!entry) return
var rs = mapStream(xfs.createReadStream(path.join(cwd, filename)), header)
rs.on('error', function (err) { // always forward errors on destroy
entry.destroy(err)
})
pump(rs, entry)
}
var onnextentry = function (err) {
if (err) return pack.destroy(err)
statNext(onstat)
}
onnextentry()
return pack
}
var head = function (list) {
return list.length ? list[list.length - 1] : null
}
var processGetuid = function () {
return process.getuid ? process.getuid() : -1
}
var processUmask = function () {
return process.umask ? process.umask() : 0
}
exports.extract = function (cwd, opts) {
if (!cwd) cwd = '.'
if (!opts) opts = {}
var xfs = opts.fs || fs
var ignore = opts.ignore || opts.filter || noop
var map = opts.map || noop
var mapStream = opts.mapStream || echo
var own = opts.chown !== false && !win32 && processGetuid() === 0
var extract = opts.extract || tar.extract()
var stack = []
var now = new Date()
var umask = typeof opts.umask === 'number' ? ~opts.umask : ~processUmask()
var dmode = typeof opts.dmode === 'number' ? opts.dmode : 0
var fmode = typeof opts.fmode === 'number' ? opts.fmode : 0
var strict = opts.strict !== false
if (opts.strip) map = strip(map, opts.strip)
if (opts.readable) {
dmode |= parseInt(555, 8)
fmode |= parseInt(444, 8)
}
if (opts.writable) {
dmode |= parseInt(333, 8)
fmode |= parseInt(222, 8)
}
var utimesParent = function (name, cb) { // we just set the mtime on the parent dir again everytime we write an entry
var top
while ((top = head(stack)) && name.slice(0, top[0].length) !== top[0]) stack.pop()
if (!top) return cb()
xfs.utimes(top[0], now, top[1], cb)
}
var utimes = function (name, header, cb) {
if (opts.utimes === false) return cb()
if (header.type === 'directory') return xfs.utimes(name, now, header.mtime, cb)
if (header.type === 'symlink') return utimesParent(name, cb) // TODO: how to set mtime on link?
xfs.utimes(name, now, header.mtime, function (err) {
if (err) return cb(err)
utimesParent(name, cb)
})
}
var chperm = function (name, header, cb) {
var link = header.type === 'symlink'
var chmod = link ? xfs.lchmod : xfs.chmod
var chown = link ? xfs.lchown : xfs.chown
if (!chmod) return cb()
var mode = (header.mode | (header.type === 'directory' ? dmode : fmode)) & umask
chmod(name, mode, function (err) {
if (err) return cb(err)
if (!own) return cb()
if (!chown) return cb()
chown(name, header.uid, header.gid, cb)
})
}
extract.on('entry', function (header, stream, next) {
header = map(header) || header
header.name = normalize(header.name)
var name = path.join(cwd, path.join('/', header.name))
if (ignore(name, header)) {
stream.resume()
return next()
}
var stat = function (err) {
if (err) return next(err)
utimes(name, header, function (err) {
if (err) return next(err)
if (win32) return next()
chperm(name, header, next)
})
}
var onsymlink = function () {
if (win32) return next() // skip symlinks on win for now before it can be tested
xfs.unlink(name, function () {
xfs.symlink(header.linkname, name, stat)
})
}
var onlink = function () {
if (win32) return next() // skip links on win for now before it can be tested
xfs.unlink(name, function () {
var srcpath = path.resolve(cwd, header.linkname)
xfs.link(srcpath, name, function (err) {
if (err && err.code === 'EPERM' && opts.hardlinkAsFilesFallback) {
stream = xfs.createReadStream(srcpath)
return onfile()
}
stat(err)
})
})
}
var onfile = function () {
var ws = xfs.createWriteStream(name)
var rs = mapStream(stream, header)
ws.on('error', function (err) { // always forward errors on destroy
rs.destroy(err)
})
pump(rs, ws, function (err) {
if (err) return next(err)
ws.on('close', stat)
})
}
if (header.type === 'directory') {
stack.push([name, header.mtime])
return mkdirfix(name, {
fs: xfs, own: own, uid: header.uid, gid: header.gid
}, stat)
}
var dir = path.dirname(name)
validate(xfs, dir, path.join(cwd, '.'), function (err, valid) {
if (err) return next(err)
if (!valid) return next(new Error(dir + ' is not a valid path'))
mkdirfix(dir, {
fs: xfs, own: own, uid: header.uid, gid: header.gid
}, function (err) {
if (err) return next(err)
switch (header.type) {
case 'file': return onfile()
case 'link': return onlink()
case 'symlink': return onsymlink()
}
if (strict) return next(new Error('unsupported type for ' + name + ' (' + header.type + ')'))
stream.resume()
next()
})
})
})
if (opts.finish) extract.on('finish', opts.finish)
return extract
}
function validate (fs, name, root, cb) {
if (name === root) return cb(null, true)
fs.lstat(name, function (err, st) {
if (err && err.code !== 'ENOENT') return cb(err)
if (err || st.isDirectory()) return validate(fs, path.join(name, '..'), root, cb)
cb(null, false)
})
}
function mkdirfix (name, opts, cb) {
mkdirp(name, {fs: opts.xfs}, function (err, made) {
if (!err && made && opts.own) {
chownr(made, opts.uid, opts.gid, cb)
} else {
cb(err)
}
})
}