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'use strict'
const gunzip = require('./util/gunzip-maybe')
const path = require('path')
const pipeline = require('mississippi').pipeline
const tar = require('tar-fs')
module.exports = extractStream
function extractStream (dest, opts) {
opts = opts || {}
const sawIgnores = {}
return pipeline(gunzip(), tar.extract(dest, {
map: (header) => {
if (process.platform !== 'win32') {
header.uid = opts.uid == null ? header.uid : opts.uid
header.gid = opts.gid == null ? header.gid : opts.gid
}
// Note: This mirrors logic in the fs read operations that are
// employed during tarball creation, in the fstream-npm module.
// It is duplicated here to handle tarballs that are created
// using other means, such as system tar or git archive.
if (header.type === 'file') {
const base = path.basename(header.name)
if (base === '.npmignore') {
sawIgnores[header.name] = true
} else if (base === '.gitignore') {
const npmignore = header.name.replace(/\.gitignore$/, '.npmignore')
if (!sawIgnores[npmignore]) {
// Rename, may be clobbered later.
header.name = npmignore
}
}
}
return header
},
ignore: makeIgnore(opts.log),
dmode: opts.dmode,
fmode: opts.fmode,
umask: opts.umask,
strip: 1
}))
}
function makeIgnore (log) {
const sawIgnores = {}
return (name, header) => _ignore(name, header, sawIgnores, log)
}
function _ignore (name, header, sawIgnores, logger) {
if (header.type.match(/^.*link$/)) {
if (logger) {
logger.warn(
'extract-stream',
'excluding symbolic link',
header.name, '->', header.linkname)
}
return true
}
return false
}
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