[pve-devel] [PATCH manager] fix #5010: ceph: pool set only changed properties

[Aaron Lauterer]

By only setting propterties that have changed, we can avoid potential
errors in the task.

For example, if one configures the "nosizechange" property on a pool, to
prevent accidential size changes, the task will now only error if the
user is actually trying to change the size.

Prior to this patch, we would always try to set all parameters, even if
they were the same value. In the above example, this would result in the
task ending in error state, as we are not allowed to change the size.

To disable size changing you can run the following command:
ceph osd pool set {pool} nosizechange 1

Signed-off-by: Aaron Lauterer <a.lauterer at proxmox.com>
---

I am not sure if we want to log every property that is skipped. It makes
visible what is done, but is also a bit noisy.

 PVE/Ceph/Tools.pm | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/PVE/Ceph/Tools.pm b/PVE/Ceph/Tools.pm
index 9b97171e..dd27e7ce 100644
--- a/PVE/Ceph/Tools.pm
+++ b/PVE/Ceph/Tools.pm
@@ -262,9 +262,17 @@ sub set_pool {
     my $keys = [ grep { $_ ne 'size' } sort keys %$param ];
     unshift @$keys, 'size' if exists $param->{size};
 
+    my $current_properties = get_pool_properties($pool, $rados);
+
     for my $setting (@$keys) {
 	my $value = $param->{$setting};
 
+	if (defined($current_properties->{$setting}) && $value eq $current_properties->{$setting}) {
+	    print "skipping '${setting}', did not change\n";
+	    delete $param->{$setting};
+	    next;
+	}
+
 	print "pool $pool: applying $setting = $value\n";
 	if (my $err = $set_pool_setting->($pool, $setting, $value, $rados)) {
 	    print "$err";
-- 
2.39.2