* first action! (#1)

node_modules/pacote/extract.js

@@ -0,0 +1,99 @@
+'use strict'
+
+const BB = require('bluebird')
+
+const extractStream = require('./lib/extract-stream.js')
+const fs = require('fs')
+const mkdirp = BB.promisify(require('mkdirp'))
+const npa = require('npm-package-arg')
+const optCheck = require('./lib/util/opt-check.js')
+const path = require('path')
+const rimraf = BB.promisify(require('rimraf'))
+const withTarballStream = require('./lib/with-tarball-stream.js')
+const inferOwner = require('infer-owner')
+const chown = BB.promisify(require('chownr'))
+
+const truncateAsync = BB.promisify(fs.truncate)
+const readFileAsync = BB.promisify(fs.readFile)
+const appendFileAsync = BB.promisify(fs.appendFile)
+
+// you used to call me on my...
+const selfOwner = process.getuid ? {
+  uid: process.getuid(),
+  gid: process.getgid()
+} : {
+  uid: undefined,
+  gid: undefined
+}
+
+module.exports = extract
+function extract (spec, dest, opts) {
+  opts = optCheck(opts)
+  spec = npa(spec, opts.where)
+  if (spec.type === 'git' && !opts.cache) {
+    throw new TypeError('Extracting git packages requires a cache folder')
+  }
+  if (typeof dest !== 'string') {
+    throw new TypeError('Extract requires a destination')
+  }
+  const startTime = Date.now()
+  return inferOwner(dest).then(({ uid, gid }) => {
+    opts = opts.concat({ uid, gid })
+    return withTarballStream(spec, opts, stream => {
+      return tryExtract(spec, stream, dest, opts)
+    })
+      .then(() => {
+        if (!opts.resolved) {
+          const pjson = path.join(dest, 'package.json')
+          return readFileAsync(pjson, 'utf8')
+            .then(str => truncateAsync(pjson)
+              .then(() => appendFileAsync(pjson, str.replace(
+                /}\s*$/,
+                `\n,"_resolved": ${
+                  JSON.stringify(opts.resolved || '')
+                }\n,"_integrity": ${
+                  JSON.stringify(opts.integrity || '')
+                }\n,"_from": ${
+                  JSON.stringify(spec.toString())
+                }\n}`
+              ))))
+        }
+      })
+      .then(() => opts.log.silly(
+        'extract',
+        `${spec} extracted to ${dest} (${Date.now() - startTime}ms)`
+      ))
+  })
+}
+
+function tryExtract (spec, tarStream, dest, opts) {
+  return new BB((resolve, reject) => {
+    tarStream.on('error', reject)
+
+    rimraf(dest)
+      .then(() => mkdirp(dest))
+      .then((made) => {
+        // respect the current ownership of unpack targets
+        // but don't try to chown if we're not root.
+        if (selfOwner.uid === 0 &&
+            typeof selfOwner.gid === 'number' &&
+            selfOwner.uid !== opts.uid && selfOwner.gid !== opts.gid) {
+          return chown(made || dest, opts.uid, opts.gid)
+        }
+      })
+      .then(() => {
+        const xtractor = extractStream(spec, dest, opts)
+        xtractor.on('error', reject)
+        xtractor.on('close', resolve)
+        tarStream.pipe(xtractor)
+      })
+      .catch(reject)
+  })
+    .catch(err => {
+      if (err.code === 'EINTEGRITY') {
+        err.message = `Verification failed while extracting ${spec}:\n${err.message}`
+      }
+
+      throw err
+    })
+}