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#!/bin/rc
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# mkusbboot - make a bootable standalone plan 9 image to copy to a usb disk.
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#
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# due to name clashes in /srv, will only work on a machine
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# without a fossil named `fossil' already running.
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rfork en
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syscfg=/sys/lib/sysconfig
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proto=$syscfg/proto/stand-usb
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srcroot=/n/boot
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quantum=1000000
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# size of image in $quantum-byte units. 1900 is enough for production system
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# (fs, /n/boot, ~1.2GB); 900 is ample for our install image
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# (sources, /n/sources/plan9, ~370MB).
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defsize=1900
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size=()
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fn usage {
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echo usage: $argv0 '[-b boot] [-p proto] [-r root] [-s 10⁶-bytes]' >[1=2]
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exit usage
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}
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fn sigint sighup sigterm {
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rm -f /tmp/9load
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exit note
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}
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# process arguments
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done=0
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argv0=$0
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boot=/386/9loadusb
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while (~ $done 0 && ! ~ $#* 0 && ~ $1 -*) {
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switch ($1) {
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case -b; boot=$2; shift
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case -p; proto=$2; shift
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case -r; srcroot=$2; shift
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case -s; size=$2; shift
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case --; done=1 # no break in rc, alas
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case -*; usage
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}
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shift
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}
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if (! ~ $#* 0)
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usage
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# special case sources
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if (~ $srcroot /n/*)
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srcfs=`{ echo $srcroot | sed 's;^/n/([^/]+).*;\1;' }
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if (~ $srcfs sources)
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defsize=900
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if (~ $#size 0)
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size=$defsize
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# make empty disk image file of maximum size
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echo -n 'image: ' >[1=2]
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dd -ibs $quantum -obs $quantum -oseek `{hoc -e $size'-1'} -count 1 -quiet 1 \
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</dev/zero >image
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# partition it
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disk/partfs image
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cd /dev/sdXX
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# prep it: lay down mbr, fdisk partitions, 9 partitions
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echo -n mbr+fdisk+prep... >[1=2]
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disk/mbr -m /386/mbr data
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disk/fdisk -baw data
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disk/prep -bw -a^(9fat nvram fscfg fossil) plan9 >/dev/null
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# populate 9fat, nvram, fsconfig
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echo -n 9fat... >[1=2]
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switch ($objtype) {
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case 386
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# we don't normally keep gzipped kernels around,
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# but usb can be flakey and slow, so we'll make one.
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k=/tmp/9pccpuf.gz
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gzip -9 </$objtype/9pccpuf >$k
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case amd64
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k=/$objtype/9k8cpu
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case *
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echo $0: 'can''t cope with architecture' $objtype >[1=2]
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exit unknown-arch
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}
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cp $boot /tmp/9load # force format to record the name `9load'
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disk/format -b /386/pbslba -d -r 2 9fat /tmp/9load $k \
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$syscfg/usb/plan9.ini >[2=1] |
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grep -v '^(add .* at clust |Init|type |Adding file|used )'
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if (~ $objtype 386)
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rm -f $k
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rm -f /tmp/9load
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cp /dev/zero nvram >[2]/dev/null
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cp /dev/zero fscfg >[2]/dev/null
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# fill the fossil
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9fs $srcfs
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echo -n load fossil... >[1=2]
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exec loadfossil /dev/sdXX/fossil $srcroot $proto $syscfg/usb/fossil.conf
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