this can be used to test the resulting config before actually changing
anything

Signed-off-by: Dominik Csapak <d.csa...@proxmox.com>
---
changes from v1:
* rename parameter from 'no-write' to 'dry-run
* drop the print sub, instead just mention at the beginning and end
  that this is just a dry run
 PVE/API2/Domains.pm | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/PVE/API2/Domains.pm b/PVE/API2/Domains.pm
index e139869..18698c0 100644
--- a/PVE/API2/Domains.pm
+++ b/PVE/API2/Domains.pm
@@ -408,7 +408,13 @@ __PACKAGE__->register_method ({
        additionalProperties => 0,
        properties => get_standard_option('realm-sync-options', {
            realm => get_standard_option('realm'),
-       })
+           'dry-run' => {
+               description => "If set, does not write anything.",
+               type => 'boolean',
+               optional => 1,
+               default => 0,
+           },
+       }),
     },
     returns => {
        description => 'Worker Task-UPID',
@@ -420,6 +426,9 @@ __PACKAGE__->register_method ({
        my $rpcenv = PVE::RPCEnvironment::get();
        my $authuser = $rpcenv->get_user();
 
+       my $write = !(extract_param($param, 'dry-run'));
+       my $dryrunstring = $write ? '' : ' (dry run)';
+
        my $realm = $param->{realm};
        my $cfg = cfs_read_file($domainconfigfile);
        my $realmconfig = $cfg->{ids}->{$realm};
@@ -439,7 +448,7 @@ __PACKAGE__->register_method ({
        my $plugin = PVE::Auth::Plugin->lookup($type);
 
        my $worker = sub {
-           print "starting sync for realm $realm\n";
+           print "starting sync$dryrunstring for realm $realm\n";
 
            my ($synced_users, $dnmap) = $plugin->get_users($realmconfig, 
$realm);
            my $synced_groups = {};
@@ -459,12 +468,17 @@ __PACKAGE__->register_method ({
                    $update_groups->($usercfg, $realm, $synced_groups, $opts);
                }
 
-               cfs_write_file("user.cfg", $usercfg);
-               print "successfully updated $whatstring configuration\n";
+               if ($write) {
+                   cfs_write_file("user.cfg", $usercfg) if $write;
+                   print "successfully updated $whatstring configuration\n" if 
$write;
+               } else {
+                   print "NOTE: This is just a dry run. No actual data was 
written.\n";
+               }
            }, "syncing $whatstring failed");
        };
 
-       return $rpcenv->fork_worker('auth-realm-sync', $realm, $authuser, 
$worker);
+       my $workerid = $write ? 'auth-realm-sync' : 'auth-realm-sync-test';
+       return $rpcenv->fork_worker($workerid, $realm, $authuser, $worker);
     }});
 
 1;
-- 
2.20.1


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