api: split max-depth schema/types

into the regular one (with default == MAX) and the one used for
pull/sync, where the default is 'None' which actually means the remote
end reduces the scope of sync automatically (or, if needed,
backwards-compat mode without any remote namespaces at all).

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

pbs-api-types/src/datastore.rs

@@ -90,6 +90,12 @@ pub const NS_MAX_DEPTH_SCHEMA: Schema =
         .default(0)
         .schema();
 
+pub const NS_MAX_DEPTH_REDUCED_SCHEMA: Schema =
+IntegerSchema::new("How many levels of namespaces should be operated on (0 == no recursion, empty == automatic full recursion, namespace depths reduce maximum allowed value)")
+    .minimum(0)
+    .maximum(MAX_NAMESPACE_DEPTH as isize)
+    .schema();
+
 pub const DATASTORE_SCHEMA: Schema = StringSchema::new("Datastore name.")
     .format(&PROXMOX_SAFE_ID_FORMAT)
     .min_length(3)

pbs-api-types/src/jobs.rs

@@ -9,7 +9,8 @@ use proxmox_schema::*;
 use crate::{
     Authid, BackupNamespace, BackupType, RateLimitConfig, Userid, BACKUP_GROUP_SCHEMA,
     BACKUP_NAMESPACE_SCHEMA, DATASTORE_SCHEMA, DRIVE_NAME_SCHEMA, MEDIA_POOL_NAME_SCHEMA,
-    NS_MAX_DEPTH_SCHEMA, PROXMOX_SAFE_ID_FORMAT, REMOTE_ID_SCHEMA, SINGLE_LINE_COMMENT_SCHEMA,
+    NS_MAX_DEPTH_REDUCED_SCHEMA, PROXMOX_SAFE_ID_FORMAT, REMOTE_ID_SCHEMA,
+    SINGLE_LINE_COMMENT_SCHEMA,
 };
 
 const_regex! {
@@ -436,7 +437,7 @@ pub const GROUP_FILTER_LIST_SCHEMA: Schema =
             optional: true,
         },
         "max-depth": {
-            schema: NS_MAX_DEPTH_SCHEMA,
+            schema: NS_MAX_DEPTH_REDUCED_SCHEMA,
             optional: true,
         },
         comment: {

src/api2/pull.rs

@@ -10,8 +10,8 @@ use proxmox_sys::task_log;
 
 use pbs_api_types::{
     Authid, BackupNamespace, GroupFilter, RateLimitConfig, SyncJobConfig, DATASTORE_SCHEMA,
-    GROUP_FILTER_LIST_SCHEMA, NS_MAX_DEPTH_SCHEMA, PRIV_DATASTORE_BACKUP, PRIV_DATASTORE_PRUNE,
+    GROUP_FILTER_LIST_SCHEMA, NS_MAX_DEPTH_REDUCED_SCHEMA, PRIV_DATASTORE_BACKUP,
-    PRIV_REMOTE_READ, REMOTE_ID_SCHEMA, REMOVE_VANISHED_BACKUPS_SCHEMA,
+    PRIV_DATASTORE_PRUNE, PRIV_REMOTE_READ, REMOTE_ID_SCHEMA, REMOVE_VANISHED_BACKUPS_SCHEMA,
 };
 use pbs_config::CachedUserInfo;
 use proxmox_rest_server::WorkerTask;
@@ -193,7 +193,7 @@ pub fn do_sync_job(
                 optional: true,
             },
             "max-depth": {
-                schema: NS_MAX_DEPTH_SCHEMA,
+                schema: NS_MAX_DEPTH_REDUCED_SCHEMA,
                 optional: true,
             },
             "group-filter": {