local-path-storage/setup.sh

#!/bin/sh
# Creates a ZFS dataset per PV.  The helper pod runs with hostPID, and all
# ZFS and filesystem operations are performed in the host's mount namespace
# (nsenter -t 1 -m).  Running zfs directly inside the helper container would
# mount the dataset only inside the container's own mount namespace; the
# workload would then write into the parent dataset, and the child dataset
# would shadow that data after the next host reboot.
#
# The provisioner passes the volume path as $VOL_DIR (v0.0.2x and later);
# older versions passed it as -p.
set -eu

absolutePath=${VOL_DIR:-}
while getopts "m:s:p:" opt
do
    case $opt in
        p)
        absolutePath=$OPTARG
        ;;
        s)
        sizeInBytes=$OPTARG
        ;;
        m)
        volMode=$OPTARG
        ;;
    esac
done
[ -n "$absolutePath" ] || { echo "setup: no volume path given" >&2; exit 1; }

host() { nsenter -t 1 -m -- "$@"; }

host zfs create "rpool${absolutePath}"
host zfs mount "rpool${absolutePath}" 2>/dev/null || :
host findmnt -n -o SOURCE "${absolutePath}" | grep -qx "rpool${absolutePath}"
host chmod 0777 "${absolutePath}"