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#!/bin/sh
#
#    cloud-publish-tarball - wrapper for publishing cloud tarballs
#
#    Copyright (C) 2010 Canonical Ltd.
#
#    Authors: Scott Moser <smoser@canonical.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, version 3 of the License.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.


EC2PRE=${EC2PRE:-euca-}
TMPD=""
VERBOSITY=1
error() { echo "$@" 1>&2; }
debug() { 
	[ ${VERBOSITY} -ge $1 ] || return 0; 
	shift
	error "$@"
}
log() { debug "$1" "$(date): ====== $2 ======" ; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
cleanup() {
	[ -n "${TMPD}" -a -d "${TMPD}" ] || return 0;
	debug 2 "cleaning up ${TMPD}"
	rm -Rf "${TMPD}";
}
bad_Usage() { Usage 1>&2; [ $# -eq 0 ] || error "$@"; exit 1; }
Usage() {
	cat <<EOF
Usage: ${0##*/} [ options ] tarfile bucket [arch]

   register a UEC tarball (ie, per http://cloud-images.ubuntu.com)
   if arch is not provided, a name-based attempt is made to guess
   tarfile may be a url

   options:
           --hook-img e       invoke 'e' with full path to downloaded disk image
      -k | --kernel  k        use previously registered kernel with id 'k'
                              specify 'none' for no kernel
      -K | --kernel-file f    bundle, upload, use file 'f' as kernel
           --rename-kernel k  rename kernel to 'k' (applies to loader)
      -r | --ramdisk r        use previously registered ramdisk with id 'r'
                              specify 'none' for no ramdisk
      -R | --ramdisk-file f   bundle, upload, use file 'f' as ramdisk
           --rename-ramdisk r rename ramdisk to 'r'
           --resize  s        resize the partition image before uploading
                              's' must be valid input to cloud-resize-image
           --save-downloaded  if the image is a url, save it to '.'
      -q | --quiet            be quiet, only output published ids
      -l | --use-loader       use the loader kernel rather than linux kernel
           --rename-image f   rename image to 'f' before publishing

   Example:
   - ${0##*/} lucid-cloud-i386.tar.gz my-lucid-bucket i386
EOF
}

upload_register() {
	local out="" ret=0
	out=$(cloud-publish-image "${@}") || {
		ret=$?
		printf "%s" "${out}"
		return $ret
	}
	set -- ${out}
	_RET=${1}
}

dl() {
	# dl url, target, quiet
	local url=${1} target=${2} quiet=${3:-1}
	if [ -f "${url}" ]; then
		[ "${target}" = "-" ] && { cat "$url"; return; }
		cp "$url" "$target"
		return
	fi
	local qflag="-q"
	[ "$quiet" = "0" ] && qflag=""

	wget $qflag --progress=dot:mega "$url" -O "$target" ||
		return 1
}

dl_input_image() {
	# this downloads an image if necessary and sets _RET to location of image
	local input="$1" save_dir="${2:-.}" ret="" quiet=0
	[ $VERBOSITY -eq 0 ] && quiet=1 # this differs from cloud-publish-image
	case "$input" in
		file://*)
			ret="$save_dir/${input##*/}"
			dl "${input#file://}" "$ret" $quiet || return $?;;
		http://*|ftp://*|https://*)
			ret="$save_dir/${input##*/}"
			dl "$input" "$ret" $quiet || return $?
			;;
		*) ret="$input";;
	esac
	_RET="$ret"
}

[ "${CLOUD_UTILS_WARN_UEC:-0}" = "0" ] && _n="${0##*/}" && [ "${_n#uec}" != "${_n}" ] &&
	error "WARNING: '${0##*/}' is now to 'cloud${_n#uec}'. Please update your tools or docs" &&
	export CLOUD_UTILS_WARN_UEC=1

short_opts="hlk:K:qr:R:"
long_opts="help,hook-img:,kernel:,kernel-file:,quiet,use-loader,ramdisk:,ramdisk-file:,rename-image:,rename-kernel:,rename-ramdisk:,resize:,save-downloaded"
getopt_out=$(getopt --name "${0##*/}" --shell sh \
	--options "${short_opts}" --long "${long_opts}" -- "$@") &&
	eval set -- "${getopt_out}" ||
	bad_Usage

ramdisk=""
kernel=""
loader=""
eki=""
eri=""
image=""
emi=""
resize=""
use_loader=0
rename_image=""
rename_kernel=""
rename_ramdisk=""
save_dl=0
hook_img=""

while [ $# -ne 0 ]; do
	cur=${1}; next=${2};
	case "$cur" in
		--) shift; break;;
		-h|--help) Usage; exit 0;;
		   --hook-img)
			[ -z "${hook_img}" ] || bad_Usage "only one --hook-img supported";
			[ -x "$next" ] || bad_Usage "--hook-img is not executable"
			hook_img=$(readlink -f "$next") ||
				bad_Usage "could not find full path to $next"
			hook_img="$next"
			shift;;
		-k|--kernel) eki=${next}; shift;;
		-K|--kernel-file)
			[ -f "${next}" ] && kernel=$(readlink -f "${next}") ||
				fail "failed to get path to ${next}"
			shift;;
		-q|--quiet) VERBOSITY=0;;
		-r|--ramdisk) eri=${next}; shift;;
		-R|--ramdisk-file)
			[ -f "${next}" ] && ramdisk=$(readlink -f "${next}") ||
				fail "failed to get path to ${next}"
			shift;;
		   --rename-image) rename_image=${next}; shift;;
		   --rename-kernel) rename_kernel=${next}; shift;;
		   --rename-ramdisk) rename_ramdisk=${next}; shift;;
		   --save-downloaded) save_dl=1;;
		   --use-loader) use_loader=1;;
		   --resize) resize=${next}; shift;;
	esac
	shift;
done

tarball=${1}
bucket=${2}
arch=${3}

[ $# -eq 3 -o $# -eq 2 ] || bad_Usage

[ -n "${eki}" -a ${use_loader} -ne 0 ] &&
	bad_Usage "--use-loader is incompatible with --kernel"

if [ -z "${arch}" ]; then
	case "${tarball}" in
		*i386*) arch=i386;;
		*amd64*|*x86_64*) arch=amd64;;
		*) fail "unable to guess arch by tarball name. give 3rd arg";;
	esac
fi

[ "$arch" = "amd64" ] && iarch="x86_64" || iarch="${arch}"

# before extracting the tarball, try to verify that the environment
# is set up, by invoking another euca command (LP: #526504)
${EC2PRE}describe-images >/dev/null ||
	fail "Unable to run ${EC2PRE}-describe-images.  Is environment for ${EC2PRE} set up?"

utmp=${TEMPDIR:-${TMPDIR:-/tmp}}
TMPD=$(mktemp -d "${utmp}/${0##*/}.XXXXXX") || fail "failed make temp"
trap cleanup EXIT

save_dir="${TMPD}"
[ $save_dl -eq 1 ] && save_dir=$PWD

dl_input_image "$tarball" "$save_dir" && tarball="$_RET" ||
	fail "failed to download image $image to $save_dir"

[ -f "${tarball}" ] && tbf=$(readlink -f "${tarball}") ||
	fail "bad tarball: ${tarball}";

start=$PWD

cd "${TMPD}"

log 1 "extracting image"
tar -S -xvzf "${tbf}" >list.out || fail "failed extract ${tarball}";

while read x; do
	[ -f "${x}" ] || continue
	case "$x" in
		*vmlinuz*)
			[ -z "${kernel}" -a -z "${eki}" ] && kernel=${x};;
		*initrd*)
			[ -z "${ramdisk}" -a -z "${eri}" ] && ramdisk=${x};;
		*.img) image=${x};;
		*-loader) [ -z "${loader}" ] && loader=${x};;
	esac
done < list.out

[ -z "${image}" ] && fail "can't find image";

[ -z "${loader}" -a ${use_loader} -eq 1 ] &&
	fail "--use-loader specified, but no loader found in tarball"

# if loader was found, and no kernel given (or found)
# then set kernel to loader
if [ -n "${loader}" ] &&
	{ [ ${use_loader} -eq 1 ] || [ -z "${kernel}" -a -z "${eki}" ]; } ; then
	debug 1 "using loader ${loader##*/} as kernel"
	kernel=${loader}
fi

[ -n "${kernel}" -o -n "${eki}" ] ||
	bad_Usage "can't find kernel. specify '--kernel none' to register none";
[ -n "${ramdisk}" -o -n "${eri}" ] || {
	debug 1 "Warning: no ramdisk found, assuming '--ramdisk none'"
	eri="none";
}

debug 1 "kernel : ${eki:-${kernel}}"
debug 1 "ramdisk: ${eri:-${ramdisk}}"
debug 1 "image  : ${image##*/}"

if [ -n "${resize}" ]; then
	log 1 "resizing ${image##*/} to ${resize}"
	out=$(resize-part-image "${image}" "${resize}" 2>&1) || {
		error "${out}";
		fail "failed to resize image file to ${resize}";
	}
fi

if [ -n "${kernel}" ]; then
	log 1 "bundle/upload kernel"
	upload_register --type kernel \
		${rename_kernel:+"--rename=${rename_kernel}"} \
		"${iarch}" "${kernel}" "${bucket}" ||
		fail "failed to upload kernel"
	eki=${_RET}
fi

if [ -n "${ramdisk}" ]; then
	log 1 "bundle/upload ramdisk"
	upload_register --type ramdisk \
		${rename_ramdisk:+"--rename=${rename_ramdisk}"} \
		"${iarch}" "${ramdisk}" "${bucket}" ||
		fail "failed ramdisk bundle/upload"
	eri=${_RET}
fi

log 1 "bundle/upload image"
upload_register --type image \
	${rename_image:+"--rename=${rename_image}"} \
	${hook_img:+"--hook-img=${hook_img}"} \
	"${iarch}" "${image}" "${bucket}" \
	--kernel "${eki}" --ramdisk "${eri}" ||
		fail "failed bundle/upload/register of image"
emi=${_RET}

log 1 "done"
printf 'emi="%s"; eri="%s"; eki="%s";\n' "${emi}" "${eri}" "${eki}"

# vi: ts=4 noexpandtab