%PDF-
%PDF-
Mini Shell
Mini Shell
'use strict'
const MiniPass = require('minipass')
const Pax = require('./pax.js')
const Header = require('./header.js')
const fs = require('fs')
const path = require('path')
const normPath = require('./normalize-windows-path.js')
const stripSlash = require('./strip-trailing-slashes.js')
const prefixPath = (path, prefix) => {
if (!prefix)
return normPath(path)
path = normPath(path).replace(/^\.(\/|$)/, '')
return stripSlash(prefix) + '/' + path
}
const maxReadSize = 16 * 1024 * 1024
const PROCESS = Symbol('process')
const FILE = Symbol('file')
const DIRECTORY = Symbol('directory')
const SYMLINK = Symbol('symlink')
const HARDLINK = Symbol('hardlink')
const HEADER = Symbol('header')
const READ = Symbol('read')
const LSTAT = Symbol('lstat')
const ONLSTAT = Symbol('onlstat')
const ONREAD = Symbol('onread')
const ONREADLINK = Symbol('onreadlink')
const OPENFILE = Symbol('openfile')
const ONOPENFILE = Symbol('onopenfile')
const CLOSE = Symbol('close')
const MODE = Symbol('mode')
const AWAITDRAIN = Symbol('awaitDrain')
const ONDRAIN = Symbol('ondrain')
const PREFIX = Symbol('prefix')
const HAD_ERROR = Symbol('hadError')
const warner = require('./warn-mixin.js')
const winchars = require('./winchars.js')
const stripAbsolutePath = require('./strip-absolute-path.js')
const modeFix = require('./mode-fix.js')
const WriteEntry = warner(class WriteEntry extends MiniPass {
constructor (p, opt) {
opt = opt || {}
super(opt)
if (typeof p !== 'string')
throw new TypeError('path is required')
this.path = normPath(p)
// suppress atime, ctime, uid, gid, uname, gname
this.portable = !!opt.portable
// until node has builtin pwnam functions, this'll have to do
this.myuid = process.getuid && process.getuid() || 0
this.myuser = process.env.USER || ''
this.maxReadSize = opt.maxReadSize || maxReadSize
this.linkCache = opt.linkCache || new Map()
this.statCache = opt.statCache || new Map()
this.preservePaths = !!opt.preservePaths
this.cwd = normPath(opt.cwd || process.cwd())
this.strict = !!opt.strict
this.noPax = !!opt.noPax
this.noMtime = !!opt.noMtime
this.mtime = opt.mtime || null
this.prefix = opt.prefix ? normPath(opt.prefix) : null
this.fd = null
this.blockLen = null
this.blockRemain = null
this.buf = null
this.offset = null
this.length = null
this.pos = null
this.remain = null
if (typeof opt.onwarn === 'function')
this.on('warn', opt.onwarn)
let pathWarn = false
if (!this.preservePaths) {
const [root, stripped] = stripAbsolutePath(this.path)
if (root) {
this.path = stripped
pathWarn = root
}
}
this.win32 = !!opt.win32 || process.platform === 'win32'
if (this.win32) {
// force the \ to / normalization, since we might not *actually*
// be on windows, but want \ to be considered a path separator.
this.path = winchars.decode(this.path.replace(/\\/g, '/'))
p = p.replace(/\\/g, '/')
}
this.absolute = normPath(opt.absolute || path.resolve(this.cwd, p))
if (this.path === '')
this.path = './'
if (pathWarn) {
this.warn('TAR_ENTRY_INFO', `stripping ${pathWarn} from absolute path`, {
entry: this,
path: pathWarn + this.path,
})
}
if (this.statCache.has(this.absolute))
this[ONLSTAT](this.statCache.get(this.absolute))
else
this[LSTAT]()
}
emit (ev, ...data) {
if (ev === 'error')
this[HAD_ERROR] = true
return super.emit(ev, ...data)
}
[LSTAT] () {
fs.lstat(this.absolute, (er, stat) => {
if (er)
return this.emit('error', er)
this[ONLSTAT](stat)
})
}
[ONLSTAT] (stat) {
this.statCache.set(this.absolute, stat)
this.stat = stat
if (!stat.isFile())
stat.size = 0
this.type = getType(stat)
this.emit('stat', stat)
this[PROCESS]()
}
[PROCESS] () {
switch (this.type) {
case 'File': return this[FILE]()
case 'Directory': return this[DIRECTORY]()
case 'SymbolicLink': return this[SYMLINK]()
// unsupported types are ignored.
default: return this.end()
}
}
[MODE] (mode) {
return modeFix(mode, this.type === 'Directory', this.portable)
}
[PREFIX] (path) {
return prefixPath(path, this.prefix)
}
[HEADER] () {
if (this.type === 'Directory' && this.portable)
this.noMtime = true
this.header = new Header({
path: this[PREFIX](this.path),
// only apply the prefix to hard links.
linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
: this.linkpath,
// only the permissions and setuid/setgid/sticky bitflags
// not the higher-order bits that specify file type
mode: this[MODE](this.stat.mode),
uid: this.portable ? null : this.stat.uid,
gid: this.portable ? null : this.stat.gid,
size: this.stat.size,
mtime: this.noMtime ? null : this.mtime || this.stat.mtime,
type: this.type,
uname: this.portable ? null :
this.stat.uid === this.myuid ? this.myuser : '',
atime: this.portable ? null : this.stat.atime,
ctime: this.portable ? null : this.stat.ctime,
})
if (this.header.encode() && !this.noPax) {
super.write(new Pax({
atime: this.portable ? null : this.header.atime,
ctime: this.portable ? null : this.header.ctime,
gid: this.portable ? null : this.header.gid,
mtime: this.noMtime ? null : this.mtime || this.header.mtime,
path: this[PREFIX](this.path),
linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
: this.linkpath,
size: this.header.size,
uid: this.portable ? null : this.header.uid,
uname: this.portable ? null : this.header.uname,
dev: this.portable ? null : this.stat.dev,
ino: this.portable ? null : this.stat.ino,
nlink: this.portable ? null : this.stat.nlink,
}).encode())
}
super.write(this.header.block)
}
[DIRECTORY] () {
if (this.path.substr(-1) !== '/')
this.path += '/'
this.stat.size = 0
this[HEADER]()
this.end()
}
[SYMLINK] () {
fs.readlink(this.absolute, (er, linkpath) => {
if (er)
return this.emit('error', er)
this[ONREADLINK](linkpath)
})
}
[ONREADLINK] (linkpath) {
this.linkpath = normPath(linkpath)
this[HEADER]()
this.end()
}
[HARDLINK] (linkpath) {
this.type = 'Link'
this.linkpath = normPath(path.relative(this.cwd, linkpath))
this.stat.size = 0
this[HEADER]()
this.end()
}
[FILE] () {
if (this.stat.nlink > 1) {
const linkKey = this.stat.dev + ':' + this.stat.ino
if (this.linkCache.has(linkKey)) {
const linkpath = this.linkCache.get(linkKey)
if (linkpath.indexOf(this.cwd) === 0)
return this[HARDLINK](linkpath)
}
this.linkCache.set(linkKey, this.absolute)
}
this[HEADER]()
if (this.stat.size === 0)
return this.end()
this[OPENFILE]()
}
[OPENFILE] () {
fs.open(this.absolute, 'r', (er, fd) => {
if (er)
return this.emit('error', er)
this[ONOPENFILE](fd)
})
}
[ONOPENFILE] (fd) {
this.fd = fd
if (this[HAD_ERROR])
return this[CLOSE]()
this.blockLen = 512 * Math.ceil(this.stat.size / 512)
this.blockRemain = this.blockLen
const bufLen = Math.min(this.blockLen, this.maxReadSize)
this.buf = Buffer.allocUnsafe(bufLen)
this.offset = 0
this.pos = 0
this.remain = this.stat.size
this.length = this.buf.length
this[READ]()
}
[READ] () {
const { fd, buf, offset, length, pos } = this
fs.read(fd, buf, offset, length, pos, (er, bytesRead) => {
if (er) {
// ignoring the error from close(2) is a bad practice, but at
// this point we already have an error, don't need another one
return this[CLOSE](() => this.emit('error', er))
}
this[ONREAD](bytesRead)
})
}
[CLOSE] (cb) {
fs.close(this.fd, cb)
}
[ONREAD] (bytesRead) {
if (bytesRead <= 0 && this.remain > 0) {
const er = new Error('encountered unexpected EOF')
er.path = this.absolute
er.syscall = 'read'
er.code = 'EOF'
return this[CLOSE](() => this.emit('error', er))
}
if (bytesRead > this.remain) {
const er = new Error('did not encounter expected EOF')
er.path = this.absolute
er.syscall = 'read'
er.code = 'EOF'
return this[CLOSE](() => this.emit('error', er))
}
// null out the rest of the buffer, if we could fit the block padding
// at the end of this loop, we've incremented bytesRead and this.remain
// to be incremented up to the blockRemain level, as if we had expected
// to get a null-padded file, and read it until the end. then we will
// decrement both remain and blockRemain by bytesRead, and know that we
// reached the expected EOF, without any null buffer to append.
if (bytesRead === this.remain) {
for (let i = bytesRead; i < this.length && bytesRead < this.blockRemain; i++) {
this.buf[i + this.offset] = 0
bytesRead++
this.remain++
}
}
const writeBuf = this.offset === 0 && bytesRead === this.buf.length ?
this.buf : this.buf.slice(this.offset, this.offset + bytesRead)
const flushed = this.write(writeBuf)
if (!flushed)
this[AWAITDRAIN](() => this[ONDRAIN]())
else
this[ONDRAIN]()
}
[AWAITDRAIN] (cb) {
this.once('drain', cb)
}
write (writeBuf) {
if (this.blockRemain < writeBuf.length) {
const er = new Error('writing more data than expected')
er.path = this.absolute
return this.emit('error', er)
}
this.remain -= writeBuf.length
this.blockRemain -= writeBuf.length
this.pos += writeBuf.length
this.offset += writeBuf.length
return super.write(writeBuf)
}
[ONDRAIN] () {
if (!this.remain) {
if (this.blockRemain)
super.write(Buffer.alloc(this.blockRemain))
return this[CLOSE](er => er ? this.emit('error', er) : this.end())
}
if (this.offset >= this.length) {
// if we only have a smaller bit left to read, alloc a smaller buffer
// otherwise, keep it the same length it was before.
this.buf = Buffer.allocUnsafe(Math.min(this.blockRemain, this.buf.length))
this.offset = 0
}
this.length = this.buf.length - this.offset
this[READ]()
}
})
class WriteEntrySync extends WriteEntry {
[LSTAT] () {
this[ONLSTAT](fs.lstatSync(this.absolute))
}
[SYMLINK] () {
this[ONREADLINK](fs.readlinkSync(this.absolute))
}
[OPENFILE] () {
this[ONOPENFILE](fs.openSync(this.absolute, 'r'))
}
[READ] () {
let threw = true
try {
const { fd, buf, offset, length, pos } = this
const bytesRead = fs.readSync(fd, buf, offset, length, pos)
this[ONREAD](bytesRead)
threw = false
} finally {
// ignoring the error from close(2) is a bad practice, but at
// this point we already have an error, don't need another one
if (threw) {
try {
this[CLOSE](() => {})
} catch (er) {}
}
}
}
[AWAITDRAIN] (cb) {
cb()
}
[CLOSE] (cb) {
fs.closeSync(this.fd)
cb()
}
}
const WriteEntryTar = warner(class WriteEntryTar extends MiniPass {
constructor (readEntry, opt) {
opt = opt || {}
super(opt)
this.preservePaths = !!opt.preservePaths
this.portable = !!opt.portable
this.strict = !!opt.strict
this.noPax = !!opt.noPax
this.noMtime = !!opt.noMtime
this.readEntry = readEntry
this.type = readEntry.type
if (this.type === 'Directory' && this.portable)
this.noMtime = true
this.prefix = opt.prefix || null
this.path = normPath(readEntry.path)
this.mode = this[MODE](readEntry.mode)
this.uid = this.portable ? null : readEntry.uid
this.gid = this.portable ? null : readEntry.gid
this.uname = this.portable ? null : readEntry.uname
this.gname = this.portable ? null : readEntry.gname
this.size = readEntry.size
this.mtime = this.noMtime ? null : opt.mtime || readEntry.mtime
this.atime = this.portable ? null : readEntry.atime
this.ctime = this.portable ? null : readEntry.ctime
this.linkpath = normPath(readEntry.linkpath)
if (typeof opt.onwarn === 'function')
this.on('warn', opt.onwarn)
let pathWarn = false
if (!this.preservePaths) {
const [root, stripped] = stripAbsolutePath(this.path)
if (root) {
this.path = stripped
pathWarn = root
}
}
this.remain = readEntry.size
this.blockRemain = readEntry.startBlockSize
this.header = new Header({
path: this[PREFIX](this.path),
linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
: this.linkpath,
// only the permissions and setuid/setgid/sticky bitflags
// not the higher-order bits that specify file type
mode: this.mode,
uid: this.portable ? null : this.uid,
gid: this.portable ? null : this.gid,
size: this.size,
mtime: this.noMtime ? null : this.mtime,
type: this.type,
uname: this.portable ? null : this.uname,
atime: this.portable ? null : this.atime,
ctime: this.portable ? null : this.ctime,
})
if (pathWarn) {
this.warn('TAR_ENTRY_INFO', `stripping ${pathWarn} from absolute path`, {
entry: this,
path: pathWarn + this.path,
})
}
if (this.header.encode() && !this.noPax) {
super.write(new Pax({
atime: this.portable ? null : this.atime,
ctime: this.portable ? null : this.ctime,
gid: this.portable ? null : this.gid,
mtime: this.noMtime ? null : this.mtime,
path: this[PREFIX](this.path),
linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
: this.linkpath,
size: this.size,
uid: this.portable ? null : this.uid,
uname: this.portable ? null : this.uname,
dev: this.portable ? null : this.readEntry.dev,
ino: this.portable ? null : this.readEntry.ino,
nlink: this.portable ? null : this.readEntry.nlink,
}).encode())
}
super.write(this.header.block)
readEntry.pipe(this)
}
[PREFIX] (path) {
return prefixPath(path, this.prefix)
}
[MODE] (mode) {
return modeFix(mode, this.type === 'Directory', this.portable)
}
write (data) {
const writeLen = data.length
if (writeLen > this.blockRemain)
throw new Error('writing more to entry than is appropriate')
this.blockRemain -= writeLen
return super.write(data)
}
end () {
if (this.blockRemain)
super.write(Buffer.alloc(this.blockRemain))
return super.end()
}
})
WriteEntry.Sync = WriteEntrySync
WriteEntry.Tar = WriteEntryTar
const getType = stat =>
stat.isFile() ? 'File'
: stat.isDirectory() ? 'Directory'
: stat.isSymbolicLink() ? 'SymbolicLink'
: 'Unsupported'
module.exports = WriteEntry
Zerion Mini Shell 1.0