core: add ROOK_REVISION_HISTORY_LIMIT operator setting

This adds an operator config setting ROOK_REVISION_HISTORY_LIMIT
defaulting to kubernetes'value for RevisionHistoryLimit.

If configured, the provided value will be used as RevisionHistoryLimit

for all Deployments rook creates.

Fixes: #12722

Signed-off-by: Michael Adam <obnox@samba.org>
(cherry picked from commit ab8fd90aa6)

pkg/operator/ceph/controller/controller_utils.go

@@ -54,6 +54,9 @@ const (
 	enforceHostNetworkSettingName  string = "ROOK_ENFORCE_HOST_NETWORK"
 	enforceHostNetworkDefaultValue string = "false"
 
+	revisionHistoryLimitSettingName  string = "ROOK_REVISION_HISTORY_LIMIT"
+	revisionHistoryLimitDefaultValue string = ""
+
 	// UninitializedCephConfigError refers to the error message printed by the Ceph CLI when there is no ceph configuration file
 	// This typically is raised when the operator has not finished initializing
 	UninitializedCephConfigError = "error calling conf_read_file"
@@ -86,7 +89,8 @@ var (
 	OperatorCephBaseImageVersion string
 
 	// loopDevicesAllowed indicates whether loop devices are allowed to be used
-	loopDevicesAllowed = false
+	loopDevicesAllowed          = false
+	revisionHistoryLimit *int32 = nil
 )
 
 func DiscoveryDaemonEnabled(data map[string]string) bool {
@@ -133,6 +137,26 @@ func EnforceHostNetwork() bool {
 	return cephv1.EnforceHostNetwork()
 }
 
+func SetRevisionHistoryLimit(data map[string]string) {
+	strval := k8sutil.GetValue(data, revisionHistoryLimitSettingName, revisionHistoryLimitDefaultValue)
+	if strval != "" {
+		numval, err := strconv.ParseInt(strval, 10, 32)
+		if err != nil {
+			logger.Warningf("failed to parse value %q for %q. assuming default value.", strval, revisionHistoryLimitSettingName)
+			revisionHistoryLimit = nil
+			return
+
+		}
+		limit := int32(numval)
+		revisionHistoryLimit = &limit
+	}
+
+}
+
+func RevisionHistoryLimit() *int32 {
+	return revisionHistoryLimit
+}
+
 // canIgnoreHealthErrStatusInReconcile determines whether a status of HEALTH_ERR in the CephCluster can be ignored safely.
 func canIgnoreHealthErrStatusInReconcile(cephCluster cephv1.CephCluster, controllerName string) bool {
 	// Get a list of all the keys causing the HEALTH_ERR status.