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#!/bin/bash
#set -x
# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
# Date: 2009-10-08
# License: GPL v3+
CMD="$1"
shift
NAME="$1"
VG="${2:-vg_$(hostname)0}"
SIZE="${3:-3G}"
RAM="${4:-512}"
DISK="/dev/mapper/${VG}-${NAME}"
[ "$CMD" == "create" ] && mkdir -p /etc/sv/kvm
ls /etc/sv/kvm/* &> /dev/null
if [ "$?" -eq 0 ]; then
TAP="${5:-tap$(( $( cat /etc/sv/kvm/*/env/TAP | sed 's/^tap//' | sort -n | tail -n 1 ) + 1 ))}"
MAC="${6:-$(printf "%s:%02x" "$(cat /etc/sv/kvm/*/env/MAC | sort | head -n1 | cut -f 1-5 -d: )" "$(( 0x$( cat /etc/sv/kvm/*/env/MAC | cut -f 6 -d: | sort -n | tail -n 1 ) + 1 ))" )}"
else
TAP=tap0
# use a locally-administered MAC address:
MAC=02:00:00:00:00:01
fi
usage() {
die "USAGE: kvm-creator create|destroy|demo guestname [volumegroup [disksize [ram [tap [mac] ] ] ] ]"
}
die() {
echo "$1"
exit_code=1
[ -n "$2" ] && exit_code="$2"
exit $exit_code
}
destroy() {
update-service --remove "/etc/sv/kvm/$NAME"
rm -rf "/etc/sv/kvm/$NAME"
deluser "$NAME"
lvremove "$VG/$NAME"
rm -rf "/home/$NAME"
}
validate() {
# Make sure none of the pieces already exist.
[ -z "$NAME" ] && die "Please pass the name of the virtual server to create" || :
[ -z "$VG" ] && [ "$CMD" == "create" ] && die "Please pass the name of the volume group to use" || :
getent passwd "$NAME" > /dev/null && die "The username '$NAME' already exists." || :
getent group "$NAME" > /dev/null && die "The group '$NAME' already exists." || :
[ -d /home/"$NAME" ] && die "The directory '/home/$NAME' already exists." || :
[ -d /etc/sv/kvm/"$NAME" ] && die "The directory '/etc/sv/kvm/$NAME' already exists." || :
[ -e $DISK ] && die "The logical volume $NAME already exists." || :
}
create() {
set -e
validate
adduser "$NAME" --disabled-password --gecos "$NAME KVM user,,,"
mkdir -p "/home/$NAME/"{.ssh,vms,"vms/$NAME"}
chown "$NAME:$NAME" "/home/$NAME/"{.ssh,vms,"vms/$NAME"}
cp /root/.ssh/authorized_keys "/home/$NAME/.ssh/"
lvcreate --name "$NAME" --size "$SIZE" $VG
mkdir "/etc/sv/kvm/$NAME"{,/log,/env}
cat > "/etc/sv/kvm/$NAME/log/run" <<EOF
#!/bin/sh
exec 2>&1
exec chpst -e ../env /usr/local/sbin/kvm-manager log
EOF
cat > "/etc/sv/kvm/$NAME/run" <<EOF
#!/bin/sh
exec 2>&1
exec chpst -e ./env /usr/local/sbin/kvm-manager up
EOF
cat > "/etc/sv/kvm/$NAME/finish" <<EOF
#!/bin/sh
exec 2>&1
exec chpst -e ./env /usr/local/sbin/kvm-manager down
EOF
chmod a+x "/etc/sv/kvm/$NAME/"{run,finish,log/run}
echo "$NAME" > "/etc/sv/kvm/$NAME/env/OWNER"
echo "$NAME" > "/etc/sv/kvm/$NAME/env/VMNAME"
echo "$TAP" > "/etc/sv/kvm/$NAME/env/TAP"
echo "$RAM" > "/etc/sv/kvm/$NAME/env/RAM"
echo "$MAC" > "/etc/sv/kvm/$NAME/env/MAC"
echo "$DISK" > "/etc/sv/kvm/$NAME/env/KVMOPTS"
}
demo() {
validate
for foo in NAME VG TAP RAM MAC SIZE DISK ; do
echo "$foo : ${!foo}"
done
}
[ "$CMD" != "create" ] && [ "$CMD" != "destroy" ] && [ "$CMD" != "demo" ] && usage
"$CMD"
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