[Buildroot] Add config to nfsd to set number of threads

[Andreas Ehmanns]

Yann, All,
Am 10.12.2015 um 21:17 schrieb Yann E. MORIN:
> Andreas, All,
>
> On 2015-12-10 20:34 +0100, Andreas Ehmanns spake thusly:
>> Dear All,
>> actually the nfs-utils package provides an NFS server together with an init
>> script. The number of threads the NFS server shall use is hard-coded in the
>> init script. The attached patch moves this parameter to a config file under
>> /etc which is read by the init script.
> The idea is OK with me. However, I have a few comments...
>
>> Additionally the return value of the init script in case of an not existing
>> file has been changed from 0 to 2 to indicate an error condition.
> We don't care about the value of the exit status of a SysV init script.
> Whether it returns 0, 1, 2 or whatever else is completely ignored by
> /sbin/init .
>
>>  From f1eae31bb357587c3491a1b45891dda8c6c0dbff Mon Sep 17 00:00:00 2001
>> From: Andreas Ehmanns <universeii at gmx.de>
>> Date: Thu, 10 Dec 2015 15:51:23 +0100
>> Subject: [PATCH 1/1] Make number of nfsd threads configurable
>>
>> Signed-off-by: Andreas Ehmanns <universeii at gmx.de>
>> ---
>>   package/nfs-utils/S60nfs       | 13 ++++++++-----
>>   package/nfs-utils/nfs-utils.mk |  2 ++
>>   package/nfs-utils/nfsd.conf    |  8 ++++++++
>>   3 files changed, 18 insertions(+), 5 deletions(-)
>>   create mode 100644 package/nfs-utils/nfsd.conf
>>
>> diff --git a/package/nfs-utils/S60nfs b/package/nfs-utils/S60nfs
>> index ec7c909..ddc472e 100755
>> --- a/package/nfs-utils/S60nfs
>> +++ b/package/nfs-utils/S60nfs
>> @@ -3,10 +3,13 @@
>>   # nfs           This shell script takes care of starting and stopping
>>   #               the NFS services. Stolen from RedHat FC5.
>>   
>> -[ -x /usr/sbin/rpc.statd ] || exit 0
>> -[ -x /usr/sbin/rpc.nfsd ] || exit 0
>> -[ -x /usr/sbin/rpc.mountd ] || exit 0
>> -[ -x /usr/sbin/exportfs ] || exit 0
>> +[ -x /usr/sbin/rpc.statd ] || exit 2
>> +[ -x /usr/sbin/rpc.nfsd ] || exit 2
>> +[ -x /usr/sbin/rpc.mountd ] || exit 2
>> +[ -x /usr/sbin/exportfs ] || exit 2
> Do we really need to check for those files? nfs-utils has no config
> option for any of those progs, only for: rpc.lockd and rpc.rquotad, but
> we're not using them in this init script.
>
> This means that we can assume that all the utilities above *are*
> installed when the init script is.
>
>> +[ -r /etc/nfsd.conf ] || exit 2
>> +. /etc/nfsd.conf
> Two comments about that:
>
>    - move the file to /etc/default/nfsd
>    - do not make it mandatory and just provide defaults
>    - use a variable to store the path
>    - no need to prefix the variable with 'NFSD'
>
> (yes, that's four comments! ;-) )
>
> So, what about:
>
>      CFG_FILE=/etc/default/nfsd
>
>      NR_THREADS=2
>      if [ -f "${CFG_FILE}" ]; then
>          . "${CFG_FILE}"
>      fi
>
>>   mkdir -p /var/lock/subsys
>>   mkdir -p /run/nfs/sm
>> @@ -25,7 +28,7 @@ start() {
>>   	echo "done"
>>   
>>   	printf "Starting NFS daemon: "
>> -	rpc.nfsd 2
>> +	rpc.nfsd $NFSD_NR_OF_THREADS
> I have a preference for using ${foo} when expanding variables, so;
>
>      rpc.nfsd ${NR_THREADS}
>
>>   	echo "done"
>>   
>>   	printf "Starting NFS mountd: "
>> diff --git a/package/nfs-utils/nfs-utils.mk b/package/nfs-utils/nfs-utils.mk
>> index 30f12fd..a26c626 100644
>> --- a/package/nfs-utils/nfs-utils.mk
>> +++ b/package/nfs-utils/nfs-utils.mk
>> @@ -51,6 +51,8 @@ endif
>>   define NFS_UTILS_INSTALL_INIT_SYSV
>>   	$(INSTALL) -D -m 0755 package/nfs-utils/S60nfs \
>>   		$(TARGET_DIR)/etc/init.d/S60nfs
>> +	$(INSTALL) -m 644 package/nfs-utils/nfsd.conf \
>> +		$(TARGET_DIR)/etc/nfsd.conf
>>   endef
>>   
>>   define NFS_UTILS_INSTALL_INIT_SYSTEMD
>> diff --git a/package/nfs-utils/nfsd.conf b/package/nfs-utils/nfsd.conf
>> new file mode 100644
> [--SNIP--]
>
> That file is no longer needed now that there is a default in the script.
> Just let the user provide one via a rootfs overlay or a post-install
> script.
>
> Care to resubmit a proper patch with the above fixed, please? Thanks! :-)
>
> Regards,
> Yann E. MORIN.
>
I picked up your ideas and prepared a new patch. Just sent it via git 
email two minutes ago. Additionally replaced occurrence of "echo -n" 
with "printf".

Regards,
Andreas