* first action! (#1)

node_modules/pacote/lib/extract-stream.js

@@ -0,0 +1,89 @@
+'use strict'
+
+const Minipass = require('minipass')
+const path = require('path')
+const tar = require('tar')
+
+module.exports = extractStream
+module.exports._computeMode = computeMode
+
+class Transformer extends Minipass {
+  constructor (spec, opts) {
+    super()
+    this.spec = spec
+    this.opts = opts
+    this.str = ''
+  }
+  write (data) {
+    this.str += data
+    return true
+  }
+  end () {
+    const replaced = this.str.replace(
+      /}\s*$/,
+      `\n,"_resolved": ${
+        JSON.stringify(this.opts.resolved || '')
+      }\n,"_integrity": ${
+        JSON.stringify(this.opts.integrity || '')
+      }\n,"_from": ${
+        JSON.stringify(this.spec.toString())
+      }\n}`
+    )
+    super.write(replaced)
+    return super.end()
+  }
+}
+
+function computeMode (fileMode, optMode, umask) {
+  return (fileMode | optMode) & ~(umask || 0)
+}
+
+function pkgJsonTransform (spec, opts) {
+  return entry => {
+    if (entry.path === 'package.json') {
+      const transformed = new Transformer(spec, opts)
+      return transformed
+    }
+  }
+}
+
+function extractStream (spec, dest, opts) {
+  opts = opts || {}
+  const sawIgnores = new Set()
+  return tar.x({
+    cwd: dest,
+    filter: (name, entry) => !entry.header.type.match(/^.*link$/i),
+    strip: 1,
+    onwarn: msg => opts.log && opts.log.warn('tar', msg),
+    uid: opts.uid,
+    gid: opts.gid,
+    umask: opts.umask,
+    transform: opts.resolved && pkgJsonTransform(spec, opts),
+    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
+          }
+        }
+      }
+    }
+  })
+}