I have an existing nerve znode structure as below:

[zk: localhost:2181(CONNECTED) 6] getAcl /nerve
'hmac,'nerve
: cdrwa
'hmac,'deploy
: cdrwa
'hmac,'admin
: cdrwa
'hmac,'synapse
: cdrwa
'sasl,'deploy
: cdrwa

And I wish to add a readonly user to the znode at this level (and that would 
apply to all znodes recursively below this level) with setAcl  /nerve 
sasl:readonly:r. If I apply this then it removes all the existing ACLs.

So, do I need to supply all the existing ACLs and append my new ACL in order to 
get the permissions I require?

Furthermore, once the singular readonly ACL has been applied, it is possible to 
revert this? Ie I cannot now specify my original ACL as there is no permissions 
to do so, so how might I now remove the readonly access? I was thinking 
something like the below:

WatchedEvent state:SaslAuthenticated type:None path:null
getAcl /nerve
'sasl,'readonly
: r
[zk: localhost:2182(CONNECTED) 1] setAcl /nerve world:anyone:cdrwa
Authentication is not valid : /nerve

Many thanks in advance.

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