#!/bin/bash -e
#
#  Copyright (C) 2015 ScyllaDB

. /usr/lib/scylla/scylla_lib.sh

print_usage() {
    echo "scylla-raid-setup --disks /dev/hda,/dev/hdb... --raiddev /dev/md0 --update-fstab --root /var/lib/scylla --volume-role [all|data|commitlog]"
    echo "  --disks	specify disks for RAID"
    echo "  --raiddev	MD device name for RAID"
    echo "  --update-fstab update /etc/fstab for RAID"
    echo "  --root specify the root of the tree"
    echo "  --volume-role specify how will this device be used (data, commitlog, or all)"
    exit 1
}

RAID=/dev/md0
FSTAB=0
ROOT=/var/lib/scylla
ROLE="all"

while [ $# -gt 0 ]; do
    case "$1" in
        "--disks")
            DISKS=`echo "$2"|tr -s ',' ' '`
            NR_DISK=$((`echo "$2"|grep , -o|wc -w` + 1))
            shift 2
            ;;
        "--raiddev")
            RAID="$2"
            shift 2
            ;;
        "--update-fstab")
            FSTAB=1
            shift 1
            ;;
        "--root")
            ROOT="$2"
            shift 2
            ;;
        "--volume-role")
            ROLE="$2"
            shift 2
            ;;
        *)
            print_usage
            ;;
    esac
done

ROOT=${ROOT%/}
case "$ROLE" in
    "all")
        MOUNT_AT=$ROOT
        ;;
    "data")
        MOUNT_AT="$ROOT/data"
        ;;
    "commitlog")
        MOUNT_AT="$ROOT/commitlog"
        ;;
    *)
        echo "Invalid role specified ($ROLE)"
        print_usage
        ;;
esac

if [ "$DISKS" = "" ]; then
    print_usage
fi

for dsk in $DISKS; do
    if [ ! -b $dsk ]; then
        echo "$dsk is not found"
        exit 1
    fi
done

echo Creating RAID0 for scylla using $NR_DISK disk\(s\): $DISKS
if [ -e $RAID ]; then
    echo "$RAID is already using"
    exit 1
fi
if mountpoint -q $MOUNT_AT; then
    echo "$MOUNT_AT is already mounted"
    exit 1
fi

if is_debian_variant; then
    env DEBIAN_FRONTEND=noninteractive apt-get -y install mdadm xfsprogs
else
    yum -y install mdadm xfsprogs
fi
if [ "$ID" = "ubuntu" ] && [ "$VERSION_ID" = "14.04" ]; then
    mdadm --create --verbose --force --run $RAID --level=0 -c1024 --raid-devices=$NR_DISK $DISKS
    mkfs.xfs $RAID -f
else
    for dsk in $DISKS; do
        blkdiscard $dsk &
    done
    wait
    mdadm --create --verbose --force --run $RAID --level=0 -c1024 --raid-devices=$NR_DISK $DISKS
    mkfs.xfs $RAID -f -K
fi
mdadm --detail --scan > /etc/mdadm.conf

mkdir -p "$MOUNT_AT"
mount -t xfs -o noatime $RAID "$MOUNT_AT"

# create this unconditionally so we are more robust about ordering
# if the script is run multiple times. But must do after mount in case
# we are mounting the root
mkdir -p "$ROOT/data"
mkdir -p "$ROOT/commitlog"
mkdir -p "$ROOT/coredump"
chown scylla:scylla "$ROOT"
chown scylla:scylla "$ROOT"/*

if [ $FSTAB -ne 0 ]; then
    UUID=`blkid $RAID | awk '{print $2}'`
    echo "$UUID $MOUNT_AT xfs noatime 0 0" >> /etc/fstab
fi