For solution A) merging the changes into an existing sysconfig/nfs, we might want to check along these lines :


diff --git a/heartbeat/nfsserver b/heartbeat/nfsserver
index cb8635f..b2da5bc 100755
--- a/heartbeat/nfsserver
+++ b/heartbeat/nfsserver
@@ -391,7 +391,12 @@ set_arg()
 	# only write to the tmp /etc/sysconfig/nfs if sysconfig exists.
 	# otherwise this distro does not support setting these options.
 	if [ -d "/etc/sysconfig" ]; then
-		echo "${key}=\"${value}\"" >> $file
+		# replace if the value exists, append otherwise
+		if grep "^\s*${key}=" $file ; then
+			sed -i "s/\s*${key}=.*$/${key}=\"${value}\"/" $file
+		else
+			echo "${key}=\"${value}\"" >> $file
+		fi
 	elif [ "$requires_sysconfig" = "true" ]; then
 		ocf_log warn "/etc/sysconfig/nfs not found, unable to set port and nfsd args."
 	fi
@@ -404,6 +409,9 @@ set_env_args()
 	local tmpconfig=$(mktemp ${HA_RSCTMP}/nfsserver-tmp-XXXXX)
 	local statd_args
 
+	## Take the $NFS_SYSCONFIG file as our skeleton
+	cp $NFS_SYSCONFIG $tmpconfig
+
 	# nfsd args
 	set_arg "RPCNFSDARGS" "$OCF_RESKEY_nfsd_args" "$tmpconfig" "true"

For Solution B) adding a parameter to add generic option, the following might be a start :
parameter example : generic_vars=KEY1=value1,KEY2=value2

diff --git a/heartbeat/nfsserver b/heartbeat/nfsserver
index cb8635f..4237d18 100755
--- a/heartbeat/nfsserver
+++ b/heartbeat/nfsserver
@@ -432,6 +432,14 @@ set_env_args()
                set_arg "RPCRQUOTADOPTS" "-p $OCF_RESKEY_rquotad_port" "$tmpconfig" "true"
        fi
 
+       # Generic variables
+       local IFSbk=$IFS
+       IFS=,
+       for pair in $OCF_RESKEY_generic_vars ; do
+               set_arg ${pair%%=*} ${pair#*=} "$tmpconfig" "true"
+       done
+       IFS=$IFSbk
+
        # override local nfs config. preserve previous local config though.
        if [ -s $tmpconfig ]; then
                cat $NFS_SYSCONFIG | grep -e "$NFS_SYSCONFIG_AUTOGEN_TAG"

(In reply to Cedric Buissart from comment #2)
> For solution A) merging the changes into an existing sysconfig/nfs, we might
> want to check along these lines :
> 
> 
> diff --git a/heartbeat/nfsserver b/heartbeat/nfsserver
> index cb8635f..b2da5bc 100755
> --- a/heartbeat/nfsserver
> +++ b/heartbeat/nfsserver
> @@ -391,7 +391,12 @@ set_arg()
>  	# only write to the tmp /etc/sysconfig/nfs if sysconfig exists.
>  	# otherwise this distro does not support setting these options.
>  	if [ -d "/etc/sysconfig" ]; then
> -		echo "${key}=\"${value}\"" >> $file
> +		# replace if the value exists, append otherwise
> +		if grep "^\s*${key}=" $file ; then
> +			sed -i "s/\s*${key}=.*$/${key}=\"${value}\"/" $file
> +		else
> +			echo "${key}=\"${value}\"" >> $file
> +		fi
>  	elif [ "$requires_sysconfig" = "true" ]; then
>  		ocf_log warn "/etc/sysconfig/nfs not found, unable to set port and nfsd
> args."
>  	fi
> @@ -404,6 +409,9 @@ set_env_args()
>  	local tmpconfig=$(mktemp ${HA_RSCTMP}/nfsserver-tmp-XXXXX)
>  	local statd_args
>  
> +	## Take the $NFS_SYSCONFIG file as our skeleton
> +	cp $NFS_SYSCONFIG $tmpconfig
> +
>  	# nfsd args
>  	set_arg "RPCNFSDARGS" "$OCF_RESKEY_nfsd_args" "$tmpconfig" "true"

I'm fine with this one. Do you have a github account? Would you be interested in submitting the pull request for review here, https://github.com/ClusterLabs/resource-agents

-- David

Cedric, Has any progress been made to get this patch upstream?

https://github.com/ClusterLabs/resource-agents/pull/581

I have verified that with resource-agents-3.9.5-20.el6.x86_64 the values
contained in /etc/sysconfig/nfs are kept intact.

[root@bucek-02 ~]# grep -v \# /etc/sysconfig/nfs 
LOCKD_UDPPORT=32769


before the patch resource-agents-3.9.5-19.el6.x86_64
====================================================

[root@bucek-02 x86_64]# OCF_ROOT=/usr/lib/ocf OCF_RESKEY_lockd_tcp_port=32803 \
OCF_RESKEY_nfs_shared_infodir=/mnt/shared/nfs \
/usr/lib/ocf/resource.d/heartbeat/nfsserver start
DEBUG: rpc.svcgssd is stopped
rpc.mountd is stopped
nfsd is stopped
rpc.rquotad is stopped
# AUTOGENERATED by /usr/lib/ocf/resource.d/heartbeat/nfsserver high availability resource-agent
INFO: Starting NFS server ...
INFO: Starting rpc.statd.
DEBUG: Starting NFS services:  [  OK  ]
Starting NFS quotas: [  OK  ]
Starting NFS mountd: [  OK  ]
Starting NFS daemon: [  OK  ]
Starting RPC idmapd: [  OK  ]
INFO: executing sm-notify
INFO: NFS server started

[root@bucek-02 x86_64]# grep -v \# /etc/sysconfig/nfs
STATDARG="--no-notify"
LOCKD_TCPPORT="32803"


with patched version resource-agents-3.9.5-20.el6.x86_64
========================================================

[root@bucek-02 ~]# OCF_ROOT=/usr/lib/ocf OCF_RESKEY_lockd_tcp_port=32803 \
OCF_RESKEY_nfs_shared_infodir=/mnt/shared/nfs \
/usr/lib/ocf/resource.d/heartbeat/nfsserver start
DEBUG: rpc.svcgssd is stopped
rpc.mountd is stopped
nfsd is stopped
rpc.rquotad is stopped
INFO: Starting NFS server ...
INFO: rpc.statd already up
DEBUG: Starting NFS services:  [  OK  ]
Starting NFS quotas: [  OK  ]
Starting NFS mountd: [  OK  ]
Starting NFS daemon: [  OK  ]
Starting RPC idmapd: [  OK  ]
INFO: executing sm-notify
INFO: NFS server started

[root@bucek-02 ~]# grep -v \# /etc/sysconfig/nfs
LOCKD_UDPPORT=32769
STATDARG="--no-notify"
LOCKD_TCPPORT="32803"

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1280.html