vpython: Add CIPD support.

vpython/spec/spec.go

 // Copyright 2017 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package spec
 
 import (
         "crypto/sha256"
         "encoding/hex"
         "fmt"
         "sort"
 
         "github.com/luci/luci-go/vpython/api/vpython"
 
         "github.com/luci/luci-go/common/data/sortby"
         "github.com/luci/luci-go/common/errors"
 
         "github.com/golang/protobuf/proto"
 )
 
 // Normalize normalizes the specification Message such that two messages
 // with identical meaning will have identical representation.
 func Normalize(spec *vpython.Spec) error {
         sort.Sort(specPackageSlice(spec.Wheel))
 
         // No duplicate packages. Since we're sorted, we can just check for no
         // immediate repetitions.
         for i, pkg := range spec.Wheel {
-                if i > 0 && pkg.Path == spec.Wheel[i-1].Path {
+                if i > 0 && pkg.Name == spec.Wheel[i-1].Name {
                         return errors.Reason("duplicate spec entries for package %(path)q").
-                                D("path", pkg.Path).
+                                D("name", pkg.Name).
                                 Err()
                 }
         }
 
         return nil
 }
 
 // Hash hashes the contents of the supplied "spec" and returns the result as
 // a hex-encoded string.
 func Hash(spec *vpython.Spec) string {
         data, err := proto.Marshal(spec)
         if err != nil {
                 panic(fmt.Errorf("failed to marshal proto: %v", err))
         }
         hash := sha256.Sum256(data)
         return hex.EncodeToString(hash[:])
 }
 
 type specPackageSlice []*vpython.Spec_Package
 
 func (s specPackageSlice) Len() int      { return len(s) }
 func (s specPackageSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
 
 func (s specPackageSlice) Less(i, j int) bool {
         return sortby.Chain{
-                func(i, j int) bool { return s[i].Path < s[j].Path },
+                func(i, j int) bool { return s[i].Name < s[j].Name },
                 func(i, j int) bool { return s[i].Version < s[j].Version },
         }.Use(i, j)
 }