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#!/bin/bash
# This will generate a openstack-style config drive image suitable for
# use with cloud-init. You may optionally pass in an ssh public key
# (using the -k/--ssh-key option) and a user-data blog (using the
# -u/--user-data option).
usage () {
echo "usage: ${0##*/}: [--ssh-key <pubkey>] [--vendor-data <file>] [--user-data <file>] [--hostname <hostname>] <imagename>"
}
ARGS=$(getopt \
-o k:u:v:h: \
--long help,hostname:,ssh-key:,user-data:,vendor-data: -n ${0##*/} \
-- "$@")
if [ $? -ne 0 ]; then
usage >&2
exit 2
fi
eval set -- "$ARGS"
while :; do
case "$1" in
--help)
usage
exit 0
;;
-k|--ssh-key)
ssh_key="$2"
shift 2
;;
-u|--user-data)
user_data="$2"
shift 2
;;
-v|--vendor-data)
vendor_data="$2"
shift 2
;;
-h|--hostname)
hostname="$2"
shift 2
;;
--) shift
break
;;
esac
done
config_image=$1
shift
if [ "$ssh_key" ] && [ -f "$ssh_key" ]; then
echo "adding pubkey from $ssh_key"
ssh_key_data=$(cat "$ssh_key")
fi
uuid=$(uuidgen)
if ! [ "$hostname" ]; then
hostname="$uuid"
fi
trap 'rm -rf $config_dir' EXIT
config_dir=$(mktemp -t -d configXXXXXX)
if [ "$user_data" ] && [ -f "$user_data" ]; then
echo "adding user data from $user_data"
cp $user_data $config_dir/user-data
else
touch $config_dir/user-data
fi
if [ "$vendor_data" ] && [ -f "$vendor_data" ]; then
echo "adding vendor data from $vendor_data"
cp $vendor_data $config_dir/vendor-data
fi
cat > $config_dir/meta-data <<-EOF
instance-id: $uuid
hostname: $hostname
local-hostname: $hostname
EOF
if [ "$ssh_key_data" ]; then
cat >> $config_dir/meta-data <<-EOF
public-keys:
- |
$ssh_key_data
EOF
fi
#PS1="debug> " bash --norc
echo "generating configuration image at $config_image"
if ! mkisofs -o $config_image -V cidata -r -J --quiet $config_dir; then
echo "ERROR: failed to create $config_image" >&2
exit 1
fi
chmod a+r $config_image
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