Create a linux ramdisk and mount it

make-ramdisk

#!/bin/bash

set -euo pipefail

run() {
    echo >&2 "+ $*"
    "$@"
}

usage() {
    cat >&2 <<EOM
usage: $(basename "$0") MOUNTPOINT [DEVICE]

MOUNTPOINT: where to mount the ramdisk
DEVICE: defaults to /dev/ram0

For example:

    $(basename "$0") /mnt/ramdisk
EOM
}

if [ $# -lt 1 ]; then
    usage
    exit 1
fi

mountpoint="$1"
device="${2-/dev/ram0}"

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

if ! [ -d "$mountpoint" ]; then
    run mkdir -v "$mountpoint"
fi

run mkfs.ext4 -O '^has_journal' -L ramdisk "$device"

run mount "$device" "$mountpoint"

mkdir -v "$mountpoint/private"
chmod 700 "$mountpoint/private"