#!/bin/bash

set -e
set -x

iscsiadm_host_strategy=$([ $ISCSIADM_HOST_STRATEGY ] && echo $ISCSIADM_HOST_STRATEGY || echo "chroot")
iscsiadm_host_path=$( [ $ISCSIADM_HOST_PATH ] && echo $ISCSIADM_HOST_PATH || echo "/sbin/iscsiadm")
echo "using iscsiadm_host_strategy=$iscsiadm_host_strategy"
echo "using iscsiadm_host_path=$iscsiadm_host_path"

case $iscsiadm_host_strategy in
    chroot)
        # https://engineering.docker.com/2019/07/road-to-containing-iscsi/
        chroot /host /usr/bin/env -i PATH="/usr/sbin:/usr/bin:/sbin:/bin" iscsiadm "${@:1}"
        ;;

    nsenter)
        # https://github.com/siderolabs/extensions/issues/38#issuecomment-1125403043
        iscsid_pid=$(for proc in /proc/*/cmdline; do grep -q "iscsid -f" <<< $(cat $proc 2>/dev/null | tr "\0" " ") && echo $(basename $(dirname $proc)) && break; done)
        if [ "$iscsid_pid" = "" ]; then
            echo "could not find the iscsid process"
            exit 1
        fi
        nsenter --mount="/proc/${iscsid_pid}/ns/mnt" --net="/proc/${iscsid_pid}/ns/net" -- $iscsiadm_host_path "${@:1}"
        ;;

    *)
        echo "$iscsiadm_host_strategy is not a valid strategy, choose either 'chroot' or 'nsenter'"
        exit 1
        ;;
esac