Vendor integration dependencies.

integration/vendor/github.com/docker/libcompose/config/hash.go

@@ -0,0 +1,95 @@
+package config
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+
+	"github.com/docker/libcompose/yaml"
+)
+
+// GetServiceHash computes and returns a hash that will identify a service.
+// This hash will be then used to detect if the service definition/configuration
+// have changed and needs to be recreated.
+func GetServiceHash(name string, config *ServiceConfig) string {
+	hash := sha1.New()
+
+	io.WriteString(hash, name)
+
+	//Get values of Service through reflection
+	val := reflect.ValueOf(config).Elem()
+
+	//Create slice to sort the keys in Service Config, which allow constant hash ordering
+	serviceKeys := []string{}
+
+	//Create a data structure of map of values keyed by a string
+	unsortedKeyValue := make(map[string]interface{})
+
+	//Get all keys and values in Service Configuration
+	for i := 0; i < val.NumField(); i++ {
+		valueField := val.Field(i)
+		keyField := val.Type().Field(i)
+
+		serviceKeys = append(serviceKeys, keyField.Name)
+		unsortedKeyValue[keyField.Name] = valueField.Interface()
+	}
+
+	//Sort serviceKeys alphabetically
+	sort.Strings(serviceKeys)
+
+	//Go through keys and write hash
+	for _, serviceKey := range serviceKeys {
+		serviceValue := unsortedKeyValue[serviceKey]
+
+		io.WriteString(hash, fmt.Sprintf("\n  %v: ", serviceKey))
+
+		switch s := serviceValue.(type) {
+		case yaml.SliceorMap:
+			sliceKeys := []string{}
+			for lkey := range s {
+				sliceKeys = append(sliceKeys, lkey)
+			}
+			sort.Strings(sliceKeys)
+
+			for _, sliceKey := range sliceKeys {
+				io.WriteString(hash, fmt.Sprintf("%s=%v, ", sliceKey, s[sliceKey]))
+			}
+		case yaml.MaporEqualSlice:
+			for _, sliceKey := range s {
+				io.WriteString(hash, fmt.Sprintf("%s, ", sliceKey))
+			}
+		case yaml.MaporColonSlice:
+			for _, sliceKey := range s {
+				io.WriteString(hash, fmt.Sprintf("%s, ", sliceKey))
+			}
+		case yaml.MaporSpaceSlice:
+			for _, sliceKey := range s {
+				io.WriteString(hash, fmt.Sprintf("%s, ", sliceKey))
+			}
+		case yaml.Command:
+			for _, sliceKey := range s {
+				io.WriteString(hash, fmt.Sprintf("%s, ", sliceKey))
+			}
+		case yaml.Stringorslice:
+			sort.Strings(s)
+
+			for _, sliceKey := range s {
+				io.WriteString(hash, fmt.Sprintf("%s, ", sliceKey))
+			}
+		case []string:
+			sliceKeys := s
+			sort.Strings(sliceKeys)
+
+			for _, sliceKey := range sliceKeys {
+				io.WriteString(hash, fmt.Sprintf("%s, ", sliceKey))
+			}
+		default:
+			io.WriteString(hash, fmt.Sprintf("%v", serviceValue))
+		}
+	}
+
+	return hex.EncodeToString(hash.Sum(nil))
+}