Handle "Not implemented" error codes in functional test

Check for the error message "Not Implemented" in ComposeObject
API call. If it is seen, log NA for the test and log the error, but continue
with the test.

Fixes #834

functional_tests.go

@@ -121,6 +121,11 @@ func ignoredLog(function string, args map[string]interface{}, startTime time.Tim
 	return log.WithFields(fields)
 }
 
+func isErrNotImplemented(err error) bool {
+	errResp := minio.ToErrorResponse(err)
+	return errResp.Code != "NotImplemented"
+}
+
 func init() {
 	// If server endpoint is not set, all tests default to
 	// using https://play.minio.io:9000
@@ -4478,6 +4483,10 @@ func testComposeMultipleSources(c *minio.Client) {
 	}
 	err = c.ComposeObject(dst, srcs)
 	if err != nil {
+		if isErrNotImplemented(err) {
+			ignoredLog(function, args, startTime, err.Error()).Info()
+			return
+		}
 		failureLog(function, args, startTime, "", "ComposeObject failed", err).Fatal()
 	}
 
@@ -4752,6 +4761,10 @@ func testUserMetadataCopyingWrapper(c *minio.Client) {
 	args["source"] = srcs
 
 	if err != nil {
+		if isErrNotImplemented(err) {
+			ignoredLog(function, args, startTime, err.Error()).Info()
+			return
+		}
 		failureLog(function, args, startTime, "", "ComposeObject failed", err).Fatal()
 	}
 
@@ -4776,6 +4789,10 @@ func testUserMetadataCopyingWrapper(c *minio.Client) {
 	args["source"] = srcs
 
 	if err != nil {
+		if isErrNotImplemented(err) {
+			ignoredLog(function, args, startTime, err.Error()).Info()
+			return
+		}
 		failureLog(function, args, startTime, "", "ComposeObject failed", err).Fatal()
 	}