#!/usr/bin/env bash
# Creates, formats and mounts swift storage loop drives
# should be idempotent, probably isn't -- caveat emptor

printf 'This script creates and mounts some loop back devices for swift, you good? [y/N] '
read ans

if [ ! "$ans" = 'y' ] && [ ! "$ans" = 'Y' ]; then
  printf "Answer: '${ans}' was not 'Y' or 'y', exiting...\n"
  exit
fi

config='/etc/swift'
storage='/srv/swift-storage'
images="${storage}/images"

mkdir -p "${images}"

# https://wikitech.wikimedia.org/wiki/Swift/Setup_New_Swift_Cluster#Setup_file_systems
image="${images}/swift-sdb.img"
mount_point="${storage}/sdb1"
label="swift-sdb1"

mkdir -p "${mount_point}"

if [ ! -f "${image}" ]; then
    touch "${image}"

    # resize img file to 5G
    truncate -s 10G "${image}"

    # format
    /sbin/mkfs.xfs -f -i size=512 -L "${label}" "${image}"

    if ! egrep -q "${mount_point}" /proc/mounts; then
        mount -t xfs -o loop,rw,noatime,nodiratime,nobarrier,logbufs=8 "${image}" "${mount_point}"
        chown -R swift:swift "${mount_point}"
    else
        printf '[$(tput red)ERROR$(tput sgr0)] Mount point %s already exists' "${mount_point}"
        exit 1
    fi
else
   printf '[$(tput red)ERROR$(tput sgr0)] File %s already exists' "${image}"
       exit 1
fi