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#!/bin/rc
# restore arena# [dev] - load venti with arenas on dev, stored one per track
#       starting with arena#.  must have run fmtarenas before restoring
#       the first arena in the partition.
#       this must be run on the venti server, without venti running on the
#       affected arena partition(s).
rfork ne
if (test -e /sys/lib/backup/funcs)
        .   /sys/lib/backup/funcs
switch ($#*) {
case 1
case 2
        rdev=$2
case *
        echo usage: $0 arena-num '[dev]' >[1=2]
        exit usage
}
starena=$1
if (! ~ $starena [0-9] [0-9][0-9] [0-9][0-9][0-9]) {
        echo $0: bad starting arena: $starena >[1=2]
        exit bad-arena-num
}

# clear any dregs from a previous run
unmount /mnt/cd >[2]/dev/null
sleep 1
kill cdfs | rc
sleep 1
cdfs -d $rdev || exit
cd /mnt/cd

#for (track in d[0-9]*)
#       venti/wrarena $track    # slow; takes about 12½ mins. per GB

arena = $starena
# set arenabase for arenastart
arenabase = `{ venti/printarenapart $arenas | sed -e 's/.*arenabase=//' -e 1q }
kill printarenapart | rc                # printarenapart leaves a process behind
# echo arenabase $arenabase

skipping=yes
for (track in d[0-9]*) {
        if (~ track 'd[0-9]*') {
                echo $0: no tracks in /mnt/cd >[1=2]
                exit no-tracks
        }
        if (~ $skipping yes) {
                # verify that first track is the expected one
                type=`{file $track}
                switch ($"type) {
                case *': venti arena'
                        name=`{ venti/printarena $track >[2=1] |
                                sed -e 's/.*name=([^ =]+).*/\1/' -e 1q }
                case *
                        name=NOT-A-VENTI-ARENA
                }
                kill printarena | rc    # printarena leaves a process behind

                echo -n first track is $"name'; is that right? '
                switch (`{read}) {
                case [yY]*
                        skipping=no
                case skip
                        skipping=yes
                case *
                        echo aborting, arena is unchanged. >[1=2]
                        exit 'wrong track'
                }
        }

        if (! ~ $skipping yes) {
                # copy each track into its slot in the arena partition
                venti/printarena $track >[2=1] | sed 1q | tr -d '\12'
                kill printarena | rc    # printarena leaves a process behind
        
                off = `{arenastart $arena}
                # echo -n writing $track to $arenas at 8K-block offset $off:
                sleep 3
                echo
                # argh!  something (cdfs?) appends 60K of *stuff* to each
                # arena on optical disc.  restrain dd.
                count=`{ echo $arenasize/$blocksize | bc }
                pump -i 1048576 -o 65536 -d 10 <$track |
                        dd -quiet 1 -count $count -bs $blocksize -of $arenas \
                                -oseek $off
                arena = `{hoc -e $arena+1}
        }
}
# when all done, must run venti/checkarenas, fmtisect, fmtbloom, fmtindex,
# and (the big one) venti/buildindex -b /cfg/pie/venti.conf