Guys,

Please see very interesting suggestions below from phk regarding ways to
improve cleanvar, especially in the presence of a diskless boot. I like
these ideas, but wanted to run them by y'all first.

Doug

---------- Forwarded message ----------
From: Poul-Henning Kamp <phk@...>
To: Doug Barton <DougB@...>
Date: Fri, 10 Oct 2003 16:38:11 +0200
Subject: Re: "send patches" :-)


By all means forward to whoever you think appropriate.

Basically what I want to be able to do is run my embedded
systems with an /etc/fstab which looks like:

ad0s1a / ufs ro 1 1
md /tmp mfs rw,-s1m 2 0
md /var mfs rw,-s8m 2 0

Poul-Henning


>On Thu, 9 Oct 2003, Poul-Henning Kamp wrote:
>
>>
>> The first patch does the /var initialization like I talked about.
>> it should be possible to remove the equivalent code in diskless.
>>
>> Index: cleanvar
>> ===================================================================
>> RCS file: /home/ncvs/src/etc/rc.d/cleanvar,v
>> retrieving revision 1.5
>> diff -u -r1.5 cleanvar
>> --- cleanvar 14 Jul 2003 13:02:36 -0000 1.5
>> +++ cleanvar 9 Oct 2003 13:21:56 -0000
>> @@ -7,6 +7,12 @@
>> # REQUIRE: mountcritlocal
>> # KEYWORD: FreeBSD
>>
>> +. /etc/rc.subr
>> +
>> +name="cleanvar"
>> +
>> +load_rc_config $name
>> +
>> purgedir()
>> {
>> local dir file
>> @@ -31,6 +37,46 @@
>> done
>> fi
>> }
>> +
>> +# Provide a function for normalizing the mounting of memory
>> +# filesystems. This should allow the rest of the code here to remain
>> +# as close as possible between 5-current and 4-stable.
>> +# $1 = size
>> +# $2 = mount point
>> +# $3 = (optional) bytes-per-inode
>> +mount_md() {
>> + if [ -n "$3" ]; then
>> + bpi="-i $3"
>> + fi
>> + /sbin/mdmfs $bpi -s $1 -M md $2
>> +}
>> +
>> +# If we do not have a writable /var, create a memory
>> +# filesystem for /var. We don't have /usr yet so
>> +# use mkdir instead of touch to test. We want mount
>> +# to record its mounts so we have to make sure /var/db
>> +# exists before doing the mount -a.
>> +#
>> +
>> +if (/bin/mkdir /var/.diskless 2> /dev/null); then
>> + rmdir /var/.diskless
>> +else
>> + mkdir -p /var
>> + mount_md ${varsize:=32m} /var
>> +fi
>> +
>> +# Populate /var if it looks empty
>> +if [ -d /var/run -a -d /var/db -a -d /var/empty ] ; then
>> + true
>> +else
>> + /usr/sbin/mtree -deU -f /etc/mtree/BSD.var.dist -p /var > /dev/null 2>&1
>> + LOGFILES=`/usr/bin/awk '$1 != "#" { printf "%s ", $1 } '
/etc/newsyslog.conf`
>> + if [ -n "$LOGFILES" ]; then
>> + /usr/bin/touch $LOGFILES
>> + fi
>> + /usr/bin/touch /var/log/lastlog
>> +
>> +fi
>>
>> # These files must be removed only the first time this script is run
>> # on boot.

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@... | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.