cipd: Implement 'init', 'install' and 'installed' subcommands.

go/src/infra/tools/cipd/local/manifest.go

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package local
 
 import (
         "encoding/json"
         "fmt"
         "io"
         "io/ioutil"
 )
 
+// SiteServiceDir is a name of the directory inside an installation root
+// reserved for cipd stuff.
+const SiteServiceDir = ".cipd"
+
 const (
-        // Name of the directory inside an installation root reserved for cipd stuff.
-        siteServiceDir = ".cipd"
-        // Name of the directory inside the package reserved for cipd stuff.
+        // packageServiceDir is a name of the directory inside the package
+        // reserved for cipd stuff.
         packageServiceDir = ".cipdpkg"
-        // Name of the manifest file inside the package.
+
+        // manifestName is a name of the manifest file inside the package.
         manifestName = packageServiceDir + "/manifest.json"
-        // Format version to write to the manifest file.
+
+        // manifestFormatVersion is a version to write to the manifest file.
         manifestFormatVersion = "1"
 )
 
 // InstallMode defines how to install a package.
 type InstallMode string
 
 const (
         // InstallModeSymlink is default (for backward compatibility). In this mode
         // all files are extracted to .cipd/*/... and then symlinked to the site root
         // directory. Version switch happens atomically.
@@ skipping 69 matching lines @@
 
 // writeManifest encodes and writes manifest JSON to io.Writer.
 func writeManifest(m *Manifest, w io.Writer) error {
         data, err := json.MarshalIndent(m, "", "  ")
         if err != nil {
                 return err
         }
         _, err = w.Write(data)
         return err
 }