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#!/bin/bash
VERBOSITY=0
TEMP_D=""
DEF_DISK_FORMAT="raw"
#DEF_FILESYSTEM="iso9660"
DEF_FILESYSTEM="vfat"
error() { echo "$@" 1>&2; }
errorp() { printf "$@" 1>&2; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
failp() { [ $# -eq 0 ] || errorp "$@"; exit 1; }
Usage() {
cat <<EOF
Usage: ${0##*/} [ options ] output user-data [meta-data]
Create a disk for cloud-init to utilize nocloud
options:
-h | --help show usage
-d | --disk-format D disk format to output. default: raw
-f | --filesystem F filesystem format (vfat or iso), default: iso9660
-i | --interfaces F write network interfaces file into metadata
-m | --dsmode M add 'dsmode' ('local' or 'net') to the metadata
default in cloud-init is 'net', meaning network is
required.
Example:
* cat my-user-data
#cloud-config
password: passw0rd
chpasswd: { expire: False }
ssh_pwauth: True
* echo "instance-id: \$(uuidgen || echo i-abcdefg)" > my-meta-data
* ${0##*/} my-seed.img my-user-data my-meta-data
* kvm -net nic -net user,hostfwd=tcp::2222-:22 \\
-drive file=disk1.img,if=virtio -drive file=my-seed.img,if=virtio
* ssh -p 2222 ubuntu@localhost
EOF
}
bad_Usage() { Usage 1>&2; [ $# -eq 0 ] || error "$@"; exit 1; }
cleanup() {
[ -z "${TEMP_D}" -o ! -d "${TEMP_D}" ] || rm -Rf "${TEMP_D}"
}
debug() {
local level=${1}; shift;
[ "${level}" -gt "${VERBOSITY}" ] && return
error "${@}"
}
short_opts="hi:d:f:m:o:v"
long_opts="disk-format:,dsmode:,filesystem:,help,interfaces:,output:,verbose"
getopt_out=$(getopt --name "${0##*/}" \
--options "${short_opts}" --long "${long_opts}" -- "$@") &&
eval set -- "${getopt_out}" ||
bad_Usage
## <<insert default variables here>>
output=""
userdata=""
metadata=""
filesystem=$DEF_FILESYSTEM
diskformat=$DEF_DISK_FORMAT
interfaces=_unset
dsmode=""
while [ $# -ne 0 ]; do
cur=${1}; next=${2};
case "$cur" in
-h|--help) Usage ; exit 0;;
-v|--verbose) VERBOSITY=$((${VERBOSITY}+1));;
-d|--disk-format) diskformat=$next; shift;;
-f|--filesystem) filesystem=$next; shift;;
-m|--dsmode) dsmode=$next; shift;;
-i|--interfaces) interfaces=$next; shift;;
--) shift; break;;
esac
shift;
done
## check arguments here
## how many args do you expect?
[ $# -ge 2 ] || bad_Usage "must provide output, userdata"
[ $# -le 3 ] || bad_Usage "confused by additional args"
output=$1
userdata=$2
metadata=$3
[ -n "$metadata" -a "${interfaces}" != "_unset" ] &&
fail "metadata and --interfaces are incompatible"
[ -n "$metadata" -a -n "$dsmode" ] &&
fail "metadata and dsmode are incompatible"
[ "$interfaces" = "_unset" -o -r "$interfaces" ] ||
fail "$interfaces: not a readable file"
TEMP_D=$(mktemp -d "${TMPDIR:-/tmp}/${0##*/}.XXXXXX") ||
fail "failed to make tempdir"
trap cleanup EXIT
if [ -n "$metadata" ]; then
cp "$metadata" "$TEMP_D/meta-data" || fail "$metadata: failed to copy"
else
iface_data=""
dsmode_data=""
[ "$interfaces" != "_unset" ] &&
iface_data=$(sed ':a;N;$!ba;s/\n/\\n/g' "$interfaces") &&
iface_data="\"interfaces\": '$iface_data'"
[ -n "$dsmode" ] && dsmode_data="\"dsmode\": \"$dsmode\""
printf "{\n%s\n%s\n%s\n}" "\"instance-id\": \"iid-local01\"" \
"${iface_data}" "${dsmode_data}" > "${TEMP_D}/meta-data"
fi
if [ "$userdata" = "-" ]; then
cat > "$TEMP_D/user-data" || fail "failed to read from stdin"
else
cp "$userdata" "$TEMP_D/user-data" || fail "$userdata: failed to copy"
fi
## alternatively, create a vfat filesystem with same files
img="$TEMP_D/seed.img"
truncate --size 100K "$img" || fail "failed truncate image"
case "$filesystem" in
iso9660|iso)
genisoimage -output "$img" -volid cidata \
-joliet -rock "$TEMP_D/user-data" "$TEMP_D/meta-data" \
> "$TEMP_D/err" 2>&1 ||
{ cat "$TEMP_D/err" 1>&2; fail "failed to genisoimage"; }
;;
vfat)
mkfs.vfat -n cidata "$img" || fail "failed mkfs.vfat"
mcopy -oi "$img" "$TEMP_D/user-data" "$TEMP_D/meta-data" :: ||
fail "failed to copy user-data, meta-data to img"
;;
*) fail "unknown filesystem $filesystem";;
esac
[ "$output" = "-" ] && output="$TEMP_D/final"
qemu-img convert -f raw -O "$diskformat" "$img" "$output" ||
fail "failed to convert to disk format $diskformat"
[ "$output" != "$TEMP_D/final" ] || { cat "$output" && output="-"; } ||
fail "failed to write to -"
error "wrote ${output} with filesystem=$filesystem and diskformat=$diskformat"
# vi: ts=4 noexpandtab
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