#!/bin/bash

usage() {
    echo "usage: install -r RELEASE {TARBALL|DIR} [...installer opts..]" >&2
    exit 1
}

args="$(getopt -o +r: --long help,release: -- "$@")"
eval "set -- $args"
while true; do
    case "$1" in
        --help) usage;;
        -r|--release) RELEASE="$2"; shift; shift;;
        --) shift; break;;
        *) usage;;
    esac
done
INSTALLER="$1"; shift
INSTALLER_ARGS=("$@"); set --

if [ -z "$RELEASE" ] || [ -z "$INSTALLER" ]; then
    usage
fi

if [ "$EUID" -ne 0 ]; then
    echo "error: this script must be run as root" >&2
    exit 1
fi

set -ex

THIS_DIR="$(dirname "$(readlink -f "$0")")"

BASE_CONTAINER_NAME=zulip-install-"$RELEASE"-base
if ! lxc-info -n "$BASE_CONTAINER_NAME" >/dev/null 2>&1; then
    "$THIS_DIR"/prepare-base "$RELEASE"
fi

while [ -z "$CONTAINER_NAME" ] || lxc-info -n "$CONTAINER_NAME" >/dev/null 2>&1; do
    CONTAINER_NAME="$(mktemp -u zulip-install-"$RELEASE"-XXXXX)"
done

if [ -d "$INSTALLER" ]; then
    installer_dir="$(readlink -f $INSTALLER)"
else
    installer_dir="$(mktemp -d --tmpdir zulip-server-XXXXX)"
    tar -xf "$INSTALLER" -C "$installer_dir" --transform='s,^[^/]*,zulip-server,'
fi

mkdir -p /srv/zulip/test-install/pip-cache

lxc-copy --ephemeral --keepdata -n "$BASE_CONTAINER_NAME" -N "$CONTAINER_NAME" \
         -m overlay="$installer_dir":/tmp/src/,bind=/srv/zulip/test-install/pip-cache:/root/.cache/pip

run() {
    lxc-attach -n "$CONTAINER_NAME" -- "$@"
}

# Wait for the container to boot, polling.
ok=
for i in {1..60}; do
    runlevel="$(run runlevel 2>/dev/null)" || { sleep 1; continue; }
    if [ "$runlevel" != "${0%[0-9]}" ]; then
        ok=1
        break
    fi
    sleep 1
done
if [ -z "ok" ]; then
    echo "error: timeout waiting for container to boot" >&2
    exit 1
fi

run eatmydata -- /tmp/src/zulip-server/scripts/setup/install --snakeoil-cert "${INSTALLER_ARGS[@]}"

# TODO settings.py, initialize-database, create realm