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Subject: Re: [PATCH 4/4] nfs-utils: Update nfs4_unique_id module parameter
 from the nfs.conf value
To:     Alice Mitchell <ajmitchell@redhat.com>,
        Linux NFS Mailing list <linux-nfs@vger.kernel.org>
References: <5a84777afb9ed8c866841471a1a7e3c9b295604d.camel@redhat.com>
 <115d8b45e84f3cecc9f5623e39f5078315d3ebbd.camel@redhat.com>
From:   Steve Dickson <SteveD@RedHat.com>
Message-ID: <a49c78c1-1419-409b-2386-25d94afb7ca7@RedHat.com>
Date:   Wed, 15 Jul 2020 13:44:12 -0400
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Sender: linux-nfs-owner@vger.kernel.org
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Hello,

On 7/10/20 12:44 PM, Alice Mitchell wrote:
> systemd service to grab the config value and feed it to the kernel module
Again, I'm wondering if the systemd/README should be updated to explain 
this new script... 

steved.

> ---
>  nfs.conf                      |  1 +
>  systemd/Makefile.am           |  3 +++
>  systemd/nfs-conf-export.sh    | 28 ++++++++++++++++++++++++++++
>  systemd/nfs-config.service.in | 17 +++++++++++++++++
>  4 files changed, 49 insertions(+)
>  create mode 100755 systemd/nfs-conf-export.sh
>  create mode 100644 systemd/nfs-config.service.in
> 
> diff --git a/nfs.conf b/nfs.conf
> index 186a5b19..8bb41227 100644
> --- a/nfs.conf
> +++ b/nfs.conf
> @@ -4,6 +4,7 @@
>  #
>  [general]
>  # pipefs-directory=/var/lib/nfs/rpc_pipefs
> +# nfs4_unique_id = ${machine-id}
>  #
>  [exports]
>  # rootdir=/export
> diff --git a/systemd/Makefile.am b/systemd/Makefile.am
> index 75cdd9f5..51acdc3f 100644
> --- a/systemd/Makefile.am
> +++ b/systemd/Makefile.am
> @@ -9,6 +9,7 @@ unit_files =  \
>      nfs-mountd.service \
>      nfs-server.service \
>      nfs-utils.service \
> +    nfs-config.service \
>      rpc-statd-notify.service \
>      rpc-statd.service \
>      \
> @@ -69,4 +70,6 @@ genexec_PROGRAMS = nfs-server-generator rpc-pipefs-generator
>  install-data-hook: $(unit_files)
>  	mkdir -p $(DESTDIR)/$(unitdir)
>  	cp $(unit_files) $(DESTDIR)/$(unitdir)
> +	mkdir -p $(DESTDIR)/$(libexecdir)/nfs-utils
> +	install  nfs-conf-export.sh $(DESTDIR)/$(libexecdir)/nfs-utils/
>  endif
> diff --git a/systemd/nfs-conf-export.sh b/systemd/nfs-conf-export.sh
> new file mode 100755
> index 00000000..486e8df9
> --- /dev/null
> +++ b/systemd/nfs-conf-export.sh
> @@ -0,0 +1,28 @@
> +#!/bin/bash
> +#
> +# This script pulls values out of /etc/nfs.conf and configures
> +# the appropriate kernel modules which cannot read it directly
> +
> +NFSMOD=/sys/module/nfs/parameters/nfs4_unique_id
> +NFSPROBE=/etc/modprobe.d/nfs.conf
> +
> +# Now read the values from nfs.conf
> +MACHINEID=`nfsconf --get general nfs4_unique_id`
> +if [ $? -ne 0 ] || [ "$MACHINEID" == "" ]
> +then
> +# No config vaue found, assume blank
> +MACHINEID=""
> +fi
> +
> +# Kernel module is already loaded, update the live one
> +if [ -e $NFSMOD ]; then
> +echo -n "$MACHINEID" >> $NFSMOD
> +fi
> +
> +# Rewrite the modprobe file for next reboot
> +echo "# This file is overwritten by systemd nfs-config.service" > $NFSPROBE
> +echo "# with values taken from /etc/nfs.conf" >> $NFSPROBE
> +echo "# Do not hand modify" >> $NFSPROBE
> +echo "options nfs nfs4_unique_id=\"$MACHINEID\"" >> $NFSPROBE
> +
> +echo "Set to: $MACHINEID"
> diff --git a/systemd/nfs-config.service.in b/systemd/nfs-config.service.in
> new file mode 100644
> index 00000000..c5ef1024
> --- /dev/null
> +++ b/systemd/nfs-config.service.in
> @@ -0,0 +1,17 @@
> +[Unit]
> +Description=Preprocess NFS configuration
> +PartOf=nfs-client.target
> +After=nfs-client.target
> +DefaultDependencies=no
> +
> +[Service]
> +Type=oneshot
> +# This service needs to run any time any nfs service
> +# is started, so changes to local config files get
> +# incorporated.  Having "RemainAfterExit=no" (the default)
> +# ensures this happens.
> +RemainAfterExit=no
> +ExecStart=@_libexecdir@/nfs-utils/nfs-conf-export.sh
> +
> +[Install]
> +WantedBy=nfs-client.target
>