forked from zhurui/management
95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
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// give it a tarball and a path, and it'll dump the contents
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module.exports = Extract
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var tar = require("../tar.js")
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, fstream = require("fstream")
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, inherits = require("inherits")
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, path = require("path")
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function Extract (opts) {
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if (!(this instanceof Extract)) return new Extract(opts)
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tar.Parse.apply(this)
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if (typeof opts !== "object") {
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opts = { path: opts }
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}
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// better to drop in cwd? seems more standard.
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opts.path = opts.path || path.resolve("node-tar-extract")
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opts.type = "Directory"
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opts.Directory = true
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// similar to --strip or --strip-components
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opts.strip = +opts.strip
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if (!opts.strip || opts.strip <= 0) opts.strip = 0
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this._fst = fstream.Writer(opts)
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this.pause()
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var me = this
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// Hardlinks in tarballs are relative to the root
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// of the tarball. So, they need to be resolved against
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// the target directory in order to be created properly.
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me.on("entry", function (entry) {
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// if there's a "strip" argument, then strip off that many
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// path components.
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if (opts.strip) {
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var p = entry.path.split("/").slice(opts.strip).join("/")
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entry.path = entry.props.path = p
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if (entry.linkpath) {
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var lp = entry.linkpath.split("/").slice(opts.strip).join("/")
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entry.linkpath = entry.props.linkpath = lp
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}
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}
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if (entry.type === "Link") {
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entry.linkpath = entry.props.linkpath =
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path.join(opts.path, path.join("/", entry.props.linkpath))
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}
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if (entry.type === "SymbolicLink") {
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var dn = path.dirname(entry.path) || ""
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var linkpath = entry.props.linkpath
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var target = path.resolve(opts.path, dn, linkpath)
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if (target.indexOf(opts.path) !== 0) {
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linkpath = path.join(opts.path, path.join("/", linkpath))
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}
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entry.linkpath = entry.props.linkpath = linkpath
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}
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})
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this._fst.on("ready", function () {
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me.pipe(me._fst, { end: false })
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me.resume()
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})
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this._fst.on('error', function(err) {
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me.emit('error', err)
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})
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this._fst.on('drain', function() {
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me.emit('drain')
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})
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// this._fst.on("end", function () {
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// console.error("\nEEEE Extract End", me._fst.path)
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// })
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this._fst.on("close", function () {
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// console.error("\nEEEE Extract End", me._fst.path)
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me.emit("finish")
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me.emit("end")
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me.emit("close")
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})
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}
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inherits(Extract, tar.Parse)
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Extract.prototype._streamEnd = function () {
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var me = this
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if (!me._ended || me._entry) me.error("unexpected eof")
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me._fst.end()
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// my .end() is coming later.
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}
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