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'use strict'
const path = require('path')
const tar = require('tar')
module.exports = extractStream
module.exports._computeMode = computeMode
function computeMode (fileMode, optMode, umask) {
return (fileMode | optMode) & ~(umask || 0)
}
function extractStream (dest, opts) {
opts = opts || {}
const sawIgnores = new Set()
return tar.x({
cwd: dest,
filter: (name, entry) => !entry.header.type.match(/^.*link$/i),
strip: 1,
onwarn: msg => opts.log && opts.log.warn('tar', msg),
uid: opts.uid,
gid: opts.gid,
onentry (entry) {
if (entry.type.toLowerCase() === 'file') {
entry.mode = computeMode(entry.mode, opts.fmode, opts.umask)
} else if (entry.type.toLowerCase() === 'directory') {
entry.mode = computeMode(entry.mode, opts.dmode, opts.umask)
} else {
entry.mode = computeMode(entry.mode, 0, opts.umask)
}
// Note: This mirrors logic in the fs read operations that are
// employed during tarball creation, in the fstream-npm module.
// It is duplicated here to handle tarballs that are created
// using other means, such as system tar or git archive.
if (entry.type.toLowerCase() === 'file') {
const base = path.basename(entry.path)
if (base === '.npmignore') {
sawIgnores.add(entry.path)
} else if (base === '.gitignore') {
const npmignore = entry.path.replace(/\.gitignore$/, '.npmignore')
if (!sawIgnores.has(npmignore)) {
// Rename, may be clobbered later.
entry.path = npmignore
}
}
}
}
})
}