1 files changed, 170 insertions, 0 deletions
diff --git a/node_modules/package-hash/index.js b/node_modules/package-hash/index.js
new file mode 100644
index 000000000..8947a02d9
--- /dev/null
+++ b/node_modules/package-hash/index.js
@@ -0,0 +1,170 @@
+'use strict'
+
+const cp = require('child_process')
+const fs = require('fs')
+const path = require('path')
+
+const gfs = require('graceful-fs')
+const flattenDeep = require('lodash.flattendeep')
+const md5hex = require('md5-hex')
+const releaseZalgo = require('release-zalgo')
+
+const PACKAGE_FILE = require.resolve('./package.json')
+const TEN_MEBIBYTE = 1024 * 1024 * 10
+
+const readFile = {
+  async (file) {
+    return new Promise((resolve, reject) => {
+      gfs.readFile(file, (err, contents) => {
+        err ? reject(err) : resolve(contents)
+      })
+    })
+  },
+  sync (file) {
+    return fs.readFileSync(file)
+  }
+}
+
+const tryReadFile = {
+  async (file) {
+    return new Promise(resolve => {
+      gfs.readFile(file, (err, contents) => {
+        resolve(err ? null : contents)
+      })
+    })
+  },
+
+  sync (file) {
+    try {
+      return fs.readFileSync(file)
+    } catch (err) {
+      return null
+    }
+  }
+}
+
+const tryExecFile = {
+  async (file, args, options) {
+    return new Promise(resolve => {
+      cp.execFile(file, args, options, (err, stdout) => {
+        resolve(err ? null : stdout)
+      })
+    })
+  },
+
+  sync (file, args, options) {
+    try {
+      return cp.execFileSync(file, args, options)
+    } catch (err) {
+      return null
+    }
+  }
+}
+
+const git = {
+  tryGetRef (zalgo, dir, head) {
+    const m = /^ref: (.+)$/.exec(head.toString('utf8').trim())
+    if (!m) return null
+
+    return zalgo.run(tryReadFile, path.join(dir, '.git', m[1]))
+  },
+
+  tryGetDiff (zalgo, dir) {
+    return zalgo.run(tryExecFile,
+      'git',
+      // Attempt to get consistent output no matter the platform. Diff both
+      // staged and unstaged changes.
+      ['--no-pager', 'diff', 'HEAD', '--no-color', '--no-ext-diff'],
+      {
+        cwd: dir,
+        maxBuffer: TEN_MEBIBYTE,
+        env: Object.assign({}, process.env, {
+          // Force the GIT_DIR to prevent git from diffing a parent repository
+          // in case the directory isn't actually a repository.
+          GIT_DIR: path.join(dir, '.git')
+        }),
+        // Ignore stderr.
+        stdio: ['ignore', 'pipe', 'ignore']
+      })
+  }
+}
+
+function addPackageData (zalgo, pkgPath) {
+  const dir = path.dirname(pkgPath)
+
+  return zalgo.all([
+    dir,
+    zalgo.run(readFile, pkgPath),
+    zalgo.run(tryReadFile, path.join(dir, '.git', 'HEAD'))
+      .then(head => {
+        if (!head) return []
+
+        return zalgo.all([
+          zalgo.run(tryReadFile, path.join(dir, '.git', 'packed-refs')),
+          git.tryGetRef(zalgo, dir, head),
+          git.tryGetDiff(zalgo, dir)
+        ])
+          .then(results => {
+            return [head].concat(results.filter(Boolean))
+          })
+      })
+  ])
+}
+
+function computeHash (zalgo, paths, pepper, salt) {
+  const inputs = []
+  if (pepper) inputs.push(pepper)
+
+  if (typeof salt !== 'undefined') {
+    if (Buffer.isBuffer(salt) || typeof salt === 'string') {
+      inputs.push(salt)
+    } else if (typeof salt === 'object' && salt !== null) {
+      inputs.push(JSON.stringify(salt))
+    } else {
+      throw new TypeError('Salt must be an Array, Buffer, Object or string')
+    }
+  }
+
+  return zalgo.all(paths.map(pkgPath => addPackageData(zalgo, pkgPath)))
+    .then(furtherInputs => md5hex(flattenDeep([inputs, furtherInputs])))
+}
+
+let ownHash = null
+let ownHashPromise = null
+function run (zalgo, paths, salt) {
+  if (!ownHash) {
+    return zalgo.run({
+      async () {
+        if (!ownHashPromise) {
+          ownHashPromise = computeHash(zalgo, [PACKAGE_FILE])
+        }
+        return ownHashPromise
+      },
+      sync () {
+        return computeHash(zalgo, [PACKAGE_FILE])
+      }
+    })
+      .then(hash => {
+        ownHash = new Buffer(hash, 'hex')
+        ownHashPromise = null
+        return run(zalgo, paths, salt)
+      })
+  }
+
+  if (paths === PACKAGE_FILE && typeof salt === 'undefined') {
+    // Special case that allow the pepper value to be obtained. Mainly here for
+    // testing purposes.
+    return zalgo.returns(ownHash.toString('hex'))
+  }
+
+  paths = Array.isArray(paths) ? paths : [paths]
+  return computeHash(zalgo, paths, ownHash, salt)
+}
+
+module.exports = (paths, salt) => {
+  return run(releaseZalgo.async(), paths, salt)
+}
+module.exports.sync = (paths, salt) => {
+  const result = run(releaseZalgo.sync(), paths, salt)
+  return releaseZalgo.unwrapSync(result)
+}