#!/bin/bash
#
# lib/ceph
# Functions to control the configuration and operation of the **Ceph** storage service

# Dependencies:
#
# - ``functions`` file
# - ``CEPH_DATA_DIR`` or ``DATA_DIR`` must be defined

# ``stack.sh`` calls the entry points in this order (via ``extras.d/60-ceph.sh``):
#
# - install_ceph
# - configure_ceph
# - init_ceph
# - start_ceph
# - stop_ceph
# - cleanup_ceph

# Save trace setting
XTRACE=$(set +o | grep xtrace)
set +o xtrace


# Defaults
# --------

# Set ``CEPH_DATA_DIR`` to the location of Ceph drives and objects.
# Default is the common DevStack data directory.
CEPH_DATA_DIR=${CEPH_DATA_DIR:-/var/lib/ceph}
CEPH_DISK_IMAGE=${CEPH_DATA_DIR}/drives/images/ceph.img

# Set ``CEPH_CONF_DIR`` to the location of the configuration files.
# Default is ``/etc/ceph``.
CEPH_CONF_DIR=${CEPH_CONF_DIR:-/etc/ceph}

# DevStack will create a loop-back disk formatted as XFS to store the
# Ceph data. Set ``CEPH_LOOPBACK_DISK_SIZE`` to the disk size in
# kilobytes.
# Default is 1 gigabyte.
CEPH_LOOPBACK_DISK_SIZE_DEFAULT=4G
CEPH_LOOPBACK_DISK_SIZE=${CEPH_LOOPBACK_DISK_SIZE:-$CEPH_LOOPBACK_DISK_SIZE_DEFAULT}

# Common
CEPH_FSID=$(uuidgen)
CEPH_CONF_FILE=${CEPH_CONF_DIR}/ceph.conf

# Glance
GLANCE_CEPH_USER=${GLANCE_CEPH_USER:-glance}
GLANCE_CEPH_POOL=${GLANCE_CEPH_POOL:-images}
GLANCE_CEPH_POOL_PG=${GLANCE_CEPH_POOL_PG:-8}
GLANCE_CEPH_POOL_PGP=${GLANCE_CEPH_POOL_PGP:-8}

# Nova
NOVA_CEPH_POOL=${NOVA_CEPH_POOL:-vms}
NOVA_CEPH_POOL_PG=${NOVA_CEPH_POOL_PG:-8}
NOVA_CEPH_POOL_PGP=${NOVA_CEPH_POOL_PGP:-8}

# Cinder
CINDER_CEPH_POOL=${CINDER_CEPH_POOL:-volumes}
CINDER_CEPH_POOL_PG=${CINDER_CEPH_POOL_PG:-8}
CINDER_CEPH_POOL_PGP=${CINDER_CEPH_POOL_PGP:-8}
CINDER_CEPH_USER=${CINDER_CEPH_USER:-cinder}
CINDER_CEPH_UUID=${CINDER_CEPH_UUID:-$(uuidgen)}

# Set ``CEPH_REPLICAS`` to configure how many replicas are to be
# configured for your Ceph cluster. By default we are configuring
# only one replica since this is way less CPU and memory intensive. If
# you are planning to test Ceph replication feel free to increase this value
CEPH_REPLICAS=${CEPH_REPLICAS:-1}
CEPH_REPLICAS_SEQ=$(seq ${CEPH_REPLICAS})

# Connect to an existing Ceph cluster
REMOTE_CEPH=$(trueorfalse False REMOTE_CEPH)
REMOTE_CEPH_ADMIN_KEY_PATH=${REMOTE_CEPH_ADMIN_KEY_PATH:-$CEPH_CONF_DIR/ceph.client.admin.keyring}

# Cinder encrypted volume tests are not supported with a Ceph backend due to
# bug 1463525.
ATTACH_ENCRYPTED_VOLUME_AVAILABLE=False


# Functions
# ------------

function get_ceph_version {
    local ceph_version_str=$(sudo ceph daemon mon.$(hostname) version | cut -d '"' -f 4 | cut -f 1,2 -d '.')
    echo $ceph_version_str
}

# import_libvirt_secret_ceph() - Imports Cinder user key into libvirt
# so it can connect to the Ceph cluster while attaching a Cinder block device
function import_libvirt_secret_ceph {
    cat > secret.xml <<EOF
<secret ephemeral='no' private='no'>
   <uuid>${CINDER_CEPH_UUID}</uuid>
   <usage type='ceph'>
     <name>client.${CINDER_CEPH_USER} secret</name>
   </usage>
</secret>
EOF
    sudo virsh secret-define --file secret.xml
    sudo virsh secret-set-value --secret ${CINDER_CEPH_UUID} --base64 $(sudo ceph -c ${CEPH_CONF_FILE} auth get-key client.${CINDER_CEPH_USER})
    sudo rm -f secret.xml
}

# undefine_virsh_secret() - Undefine Cinder key secret from libvirt
function undefine_virsh_secret {
    if is_service_enabled cinder || is_service_enabled nova; then
        local virsh_uuid=$(sudo virsh secret-list | awk '/^ ?[0-9a-z]/ { print $1 }')
        sudo virsh secret-undefine ${virsh_uuid} >/dev/null 2>&1
    fi
}


# check_os_support_ceph() - Check if the operating system provides a decent version of Ceph
function check_os_support_ceph {
    if [[ ! ${DISTRO} =~ (trusty|f21|f22) ]]; then
        echo "WARNING: your distro $DISTRO does not provide (at least) the Firefly release. Please use Ubuntu Trusty or Fedora 20 (and higher)"
        if [[ "$FORCE_CEPH_INSTALL" != "yes" ]]; then
            die $LINENO "If you wish to install Ceph on this distribution anyway run with FORCE_CEPH_INSTALL=yes"
        fi
        NO_UPDATE_REPOS=False
    fi
}

# cleanup_ceph() - Remove residual data files, anything left over from previous
# runs that a clean run would need to clean up
function cleanup_ceph_remote {
    # do a proper cleanup from here to avoid leftover on the remote Ceph cluster
    if is_service_enabled glance; then
        sudo ceph osd pool delete $GLANCE_CEPH_POOL $GLANCE_CEPH_POOL --yes-i-really-really-mean-it > /dev/null 2>&1
        sudo ceph auth del client.$GLANCE_CEPH_USER > /dev/null 2>&1
    fi
    if is_service_enabled cinder; then
        sudo ceph osd pool delete $CINDER_CEPH_POOL $CINDER_CEPH_POOL --yes-i-really-really-mean-it > /dev/null 2>&1
        sudo ceph auth del client.$CINDER_CEPH_USER > /dev/null 2>&1
    fi
    if is_service_enabled c-bak; then
        sudo ceph osd pool delete $CINDER_BAK_CEPH_POOL $CINDER_BAK_CEPH_POOL --yes-i-really-really-mean-it > /dev/null 2>&1
        sudo ceph auth del client.$CINDER_BAK_CEPH_USER > /dev/null 2>&1
    fi
    if is_service_enabled nova; then
        iniset $NOVA_CONF libvirt rbd_secret_uuid ""
        sudo ceph osd pool delete $NOVA_CEPH_POOL $NOVA_CEPH_POOL --yes-i-really-really-mean-it > /dev/null 2>&1
    fi
}

function cleanup_ceph_embedded {
    sudo killall -w -9 ceph-mon
    sudo killall -w -9 ceph-osd
    sudo rm -rf ${CEPH_DATA_DIR}/*/*
    if egrep -q ${CEPH_DATA_DIR} /proc/mounts; then
        sudo umount ${CEPH_DATA_DIR}
    fi
    if [[ -e ${CEPH_DISK_IMAGE} ]]; then
        sudo rm -f ${CEPH_DISK_IMAGE}
    fi

    # purge ceph config file and keys
    sudo rm -rf ${CEPH_CONF_DIR}/*
}

function cleanup_ceph_general {
    undefine_virsh_secret
}


# configure_ceph() - Set config files, create data dirs, etc
function configure_ceph {
    local count=0

    # create a backing file disk
    create_disk ${CEPH_DISK_IMAGE} ${CEPH_DATA_DIR} ${CEPH_LOOPBACK_DISK_SIZE}

    # populate ceph directory
    sudo mkdir -p ${CEPH_DATA_DIR}/{bootstrap-mds,bootstrap-osd,mds,mon,osd,tmp}

    # create ceph monitor initial key and directory
    sudo ceph-authtool /var/lib/ceph/tmp/keyring.mon.$(hostname) \
        --create-keyring --name=mon. --add-key=$(ceph-authtool --gen-print-key) \
        --cap mon 'allow *'
    sudo mkdir /var/lib/ceph/mon/ceph-$(hostname)

    # create a default ceph configuration file
    sudo tee ${CEPH_CONF_FILE} > /dev/null <<EOF
[global]
fsid = ${CEPH_FSID}
mon_initial_members = $(hostname)
mon_host = ${SERVICE_HOST}
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
filestore_xattr_use_omap = true
osd crush chooseleaf type = 0
osd journal size = 100
EOF

    # bootstrap the ceph monitor
    sudo ceph-mon -c ${CEPH_CONF_FILE} --mkfs -i $(hostname) \
        --keyring /var/lib/ceph/tmp/keyring.mon.$(hostname)

    if is_ubuntu; then
        sudo touch /var/lib/ceph/mon/ceph-$(hostname)/upstart
        sudo initctl emit ceph-mon id=$(hostname)
    else
        sudo touch /var/lib/ceph/mon/ceph-$(hostname)/sysvinit
        sudo service ceph start mon.$(hostname)
    fi

    # wait for the admin key to come up otherwise we will not be able to do the actions below
    until [ -f ${CEPH_CONF_DIR}/ceph.client.admin.keyring ]; do
        echo_summary "Waiting for the Ceph admin key to be ready..."

        count=$(($count + 1))
        if [ $count -eq 3 ]; then
            die $LINENO "Maximum of 3 retries reached"
        fi
        sleep 5
    done

    # pools data and metadata were removed in the Giant release so depending on the version we apply different commands
    local ceph_version=$(get_ceph_version)
    # change pool replica size according to the CEPH_REPLICAS set by the user
    if [[ ${ceph_version%%.*} -eq 0 ]] && [[ ${ceph_version##*.} -lt 87 ]]; then
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set rbd size ${CEPH_REPLICAS}
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set data size ${CEPH_REPLICAS}
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set metadata size ${CEPH_REPLICAS}
    else
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set rbd size ${CEPH_REPLICAS}
    fi

    # create a simple rule to take OSDs instead of host with CRUSH
    # then apply this rules to the default pool
    if [[ $CEPH_REPLICAS -ne 1 ]]; then
        sudo ceph -c ${CEPH_CONF_FILE} osd crush rule create-simple devstack default osd
        RULE_ID=$(sudo ceph -c ${CEPH_CONF_FILE} osd crush rule dump devstack | awk '/rule_id/ {print $3}' | cut -d ',' -f1)
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set rbd crush_ruleset ${RULE_ID}
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set data crush_ruleset ${RULE_ID}
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set metadata crush_ruleset ${RULE_ID}
    fi

    # create the OSD(s)
    for rep in ${CEPH_REPLICAS_SEQ}; do
        OSD_ID=$(sudo ceph -c ${CEPH_CONF_FILE} osd create)
        sudo mkdir -p ${CEPH_DATA_DIR}/osd/ceph-${OSD_ID}
        sudo ceph-osd -c ${CEPH_CONF_FILE} -i ${OSD_ID} --mkfs
        sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create osd.${OSD_ID} \
            mon 'allow profile osd ' osd 'allow *' | \
            sudo tee ${CEPH_DATA_DIR}/osd/ceph-${OSD_ID}/keyring

        # ceph's init script is parsing ${CEPH_DATA_DIR}/osd/ceph-${OSD_ID}/ and looking for a file
        # 'upstart' or 'sysinitv', thanks to these 'touches' we are able to control OSDs daemons
        # from the init script.
        if is_ubuntu; then
            sudo touch ${CEPH_DATA_DIR}/osd/ceph-${OSD_ID}/upstart
        else
            sudo touch ${CEPH_DATA_DIR}/osd/ceph-${OSD_ID}/sysvinit
        fi
    done
}

function configure_ceph_embedded_glance {
    # configure Glance service options, ceph pool, ceph user and ceph key
    sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${GLANCE_CEPH_POOL} size ${CEPH_REPLICAS}
    if [[ $CEPH_REPLICAS -ne 1 ]]; then
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${GLANCE_CEPH_POOL} crush_ruleset ${RULE_ID}
    fi
}

# configure_ceph_glance() - Glance config needs to come after Glance is set up
function configure_ceph_glance {
    sudo ceph -c ${CEPH_CONF_FILE} osd pool create ${GLANCE_CEPH_POOL} ${GLANCE_CEPH_POOL_PG} ${GLANCE_CEPH_POOL_PGP}
    sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create client.${GLANCE_CEPH_USER} \
        mon "allow r" \
        osd "allow class-read object_prefix rbd_children, allow rwx pool=${GLANCE_CEPH_POOL}" | \
        sudo tee ${CEPH_CONF_DIR}/ceph.client.${GLANCE_CEPH_USER}.keyring
    sudo chown ${STACK_USER}:$(id -g -n $whoami) ${CEPH_CONF_DIR}/ceph.client.${GLANCE_CEPH_USER}.keyring

    iniset $GLANCE_API_CONF DEFAULT show_image_direct_url True
    iniset $GLANCE_API_CONF glance_store default_store rbd
    iniset $GLANCE_API_CONF glance_store stores "file, http, rbd"
    iniset $GLANCE_API_CONF glance_store rbd_store_ceph_conf $CEPH_CONF_FILE
    iniset $GLANCE_API_CONF glance_store rbd_store_user $GLANCE_CEPH_USER
    iniset $GLANCE_API_CONF glance_store rbd_store_pool $GLANCE_CEPH_POOL
}

function configure_ceph_embedded_nova {
    # configure Nova service options, ceph pool, ceph user and ceph key
    sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${NOVA_CEPH_POOL} size ${CEPH_REPLICAS}
    if [[ $CEPH_REPLICAS -ne 1 ]]; then
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${NOVA_CEPH_POOL} crush_ruleset ${RULE_ID}
    fi
}

# configure_ceph_nova() - Nova config needs to come after Nova is set up
function configure_ceph_nova {
    sudo ceph -c ${CEPH_CONF_FILE} osd pool create ${NOVA_CEPH_POOL} ${NOVA_CEPH_POOL_PG} ${NOVA_CEPH_POOL_PGP}
    iniset $NOVA_CONF libvirt rbd_user ${CINDER_CEPH_USER}
    iniset $NOVA_CONF libvirt rbd_secret_uuid ${CINDER_CEPH_UUID}
    iniset $NOVA_CONF libvirt inject_key false
    iniset $NOVA_CONF libvirt inject_partition -2
    iniset $NOVA_CONF libvirt disk_cachemodes "network=writeback"
    iniset $NOVA_CONF libvirt images_type rbd
    iniset $NOVA_CONF libvirt images_rbd_pool ${NOVA_CEPH_POOL}
    iniset $NOVA_CONF libvirt images_rbd_ceph_conf ${CEPH_CONF_FILE}

    if ! is_service_enabled cinder; then
        sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create client.${CINDER_CEPH_USER} \
            mon "allow r" \
            osd "allow class-read object_prefix rbd_children, allow rwx pool=${CINDER_CEPH_POOL}, allow rwx pool=${NOVA_CEPH_POOL},allow rwx pool=${GLANCE_CEPH_POOL}" | \
            sudo tee ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring > /dev/null
        sudo chown ${STACK_USER}:$(id -g -n $whoami) ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring
    fi
}

function configure_ceph_embedded_cinder {
    # Configure Cinder service options, ceph pool, ceph user and ceph key
    sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${CINDER_CEPH_POOL} size ${CEPH_REPLICAS}
    if [[ $CEPH_REPLICAS -ne 1 ]]; then
        sudo ceph -c ${CEPH_CONF_FILE} osd pool set ${CINDER_CEPH_POOL} crush_ruleset ${RULE_ID}
    fi
}

# configure_ceph_cinder() - Cinder config needs to come after Cinder is set up
function configure_ceph_cinder {
    sudo ceph -c ${CEPH_CONF_FILE} osd pool create ${CINDER_CEPH_POOL} ${CINDER_CEPH_POOL_PG} ${CINDER_CEPH_POOL_PGP}
    sudo ceph -c ${CEPH_CONF_FILE} auth get-or-create client.${CINDER_CEPH_USER} \
        mon "allow r" \
        osd "allow class-read object_prefix rbd_children, allow rwx pool=${CINDER_CEPH_POOL}, allow rwx pool=${NOVA_CEPH_POOL},allow rwx pool=${GLANCE_CEPH_POOL}" | \
        sudo tee ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring
    sudo chown ${STACK_USER}:$(id -g -n $whoami) ${CEPH_CONF_DIR}/ceph.client.${CINDER_CEPH_USER}.keyring
}

# init_ceph() - Initialize databases, etc.
function init_ceph {
    # clean up from previous (possibly aborted) runs
    # make sure to kill all ceph processes first
    sudo pkill -f ceph-mon || true
    sudo pkill -f ceph-osd || true
}

# install_ceph() - Collect source and prepare
function install_ceph_remote {
    install_package ceph-common
}

function install_ceph {
    install_package ceph
}

# start_ceph() - Start running processes, including screen
function start_ceph {
    if is_ubuntu; then
        sudo initctl emit ceph-mon id=$(hostname)
        for id in $(sudo ceph -c ${CEPH_CONF_FILE} osd ls); do
            sudo start ceph-osd id=${id}
        done
    else
        sudo service ceph start
    fi
}

# stop_ceph() - Stop running processes (non-screen)
function stop_ceph {
    if is_ubuntu; then
        sudo service ceph-mon-all stop > /dev/null 2>&1
        sudo service ceph-osd-all stop > /dev/null 2>&1
    else
        sudo service ceph stop > /dev/null 2>&1
    fi
}


# Restore xtrace
$XTRACE

## Local variables:
## mode: shell-script
## End: