ignore policy/group missing errors appropriately (#9559)

cmd/iam-object-store.go

@@ -398,7 +398,7 @@ func (iamOS *IAMObjectStore) loadMappedPolicies(ctx context.Context, userType IA
 		policyFile := item.Item
 		userOrGroupName := strings.TrimSuffix(policyFile, ".json")
 		err := iamOS.loadMappedPolicy(userOrGroupName, userType, isGroup, m)
-		if err != nil {
+		if err != nil && err != errNoSuchPolicy {
 			return err
 		}
 	}

cmd/iam.go

@@ -260,11 +260,11 @@ func (sys *IAMSys) LoadGroup(objAPI ObjectLayer, group string) error {
 	defer sys.store.unlock()
 
 	err := sys.store.loadGroup(group, sys.iamGroupsMap)
-	if err != nil && err != errConfigNotFound {
+	if err != nil && err != errNoSuchGroup {
 		return err
 	}
 
-	if err == errConfigNotFound {
+	if err == errNoSuchGroup {
 		// group does not exist - so remove from memory.
 		sys.removeGroupFromMembershipsMap(group)
 		delete(sys.iamGroupsMap, group)
@@ -322,7 +322,7 @@ func (sys *IAMSys) LoadPolicyMapping(objAPI ObjectLayer, userOrGroup string, isG
 		}
 
 		// Ignore policy not mapped error
-		if err != nil && err != errConfigNotFound {
+		if err != nil && err != errNoSuchPolicy {
 			return err
 		}
 	}
@@ -346,7 +346,7 @@ func (sys *IAMSys) LoadUser(objAPI ObjectLayer, accessKey string, userType IAMUs
 		}
 		err = sys.store.loadMappedPolicy(accessKey, userType, false, sys.iamUserPolicyMap)
 		// Ignore policy not mapped error
-		if err != nil && err != errConfigNotFound {
+		if err != nil && err != errNoSuchPolicy {
 			return err
 		}
 	}

go.sum

@@ -224,8 +224,6 @@ github.com/klauspost/pgzip v1.2.1 h1:oIPZROsWuPHpOdMVWLuJZXwgjhrW8r1yEX8UqMyeNHM
 github.com/klauspost/pgzip v1.2.1/go.mod h1:Ch1tH69qFZu15pkjo5kYi6mth2Zzwzt50oCQKQE9RUs=
 github.com/klauspost/readahead v1.3.1 h1:QqXNYvm+VvqYcbrRT4LojUciM0XrznFRIDrbHiJtu/0=
 github.com/klauspost/readahead v1.3.1/go.mod h1:AH9juHzNH7xqdqFHrMRSHeH2Ps+vFf+kblDqzPFiLJg=
-github.com/klauspost/reedsolomon v1.9.3 h1:N/VzgeMfHmLc+KHMD1UL/tNkfXAt8FnUqlgXGIduwAY=
-github.com/klauspost/reedsolomon v1.9.3/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
 github.com/klauspost/reedsolomon v1.9.7 h1:+azeqnT4iNG9UEcWC+7utJ4xXQ9S8pSlkZor0DOArEQ=
 github.com/klauspost/reedsolomon v1.9.7/go.mod h1:+8WD025Xpby8/kG5h/HDPIFhiiuGEtZOKw+5Y4drAD8=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=