fleetd: support also "==" operator for metadata

To follow the maintainer's suggestion, also support the operator "==",
which is actually the same as "=".

Author: Dongsu Park

job/job.go

@@ -285,7 +285,7 @@ func (j *Job) RequiredTargetMetadata() map[string]pkg.Set {
 	} {
 		for _, valuePair := range j.requirements()[key] {
 			var s []string
-			for _, sep := range []string{"<=", ">=", "!=", "<", ">"} {
+			for _, sep := range []string{"==", "<=", ">=", "!=", "<", ">"} {
 				index := strings.Index(valuePair, sep)
 				if index != -1 {
 					s = []string{valuePair[0:index], valuePair[index:]}

machine/machine.go

@@ -111,6 +111,14 @@ func HasMetadata(state *MachineState, metadata map[string]pkg.Set) bool {
 						log.Debugf("Local Metadata(%s) does not match requirement", key)
 						return false
 					}
+				} else if index := strings.Index(v, "=="); strings.Contains(v, "==") && (index == 0) {
+					if v[2:] == local {
+						log.Debugf("Local Metadata(%s) meets requirement", key)
+						continue
+					} else {
+						log.Debugf("Local Metadata(%s) does not match requirement", key)
+						return false
+					}
 				} else {
 					log.Debugf("Local Metadata(%s) does not match requirement", key)
 					return false