hctl

#!/usr/bin/env bash
#
# Copyright (c) 2020-2022 Seagate Technology LLC and/or its Affiliates
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# For any questions about this software or licensing,
# please email opensource@seagate.com or cortx-questions@seagate.com.

set -e -o pipefail
# set -x
export PS4='+ [${BASH_SOURCE[0]##*/}:${LINENO}${FUNCNAME[0]:+:${FUNCNAME[0]}}] '

### Main entry point to all Hare features

# constants
PROG=${0##*/}
SRC_DIR="$(dirname $(readlink -f $0))"
M0_SRC_DIR=${M0_SRC_DIR:-${SRC_DIR%/*}/cortx-motr}

# Quick fix for EOS-10650
CORTX_HA_BIN=/opt/seagate/cortx/ha/bin/
CORTX_HA_PY_INCLUDES=/opt/seagate/cortx/ha/lib64/python3.6/site-packages:/opt/seagate/cortx/ha/lib/python3.6/site-packages

die() {
    local LightRed="$(tput bold ; tput setaf 1)"
    local NC="$(tput sgr0)" # No Color
    local error='[ERROR]'

    if [[ -t 2 ]] ; then
        error="$LightRed$error$NC"
    fi

    echo -e "$PROG $error $@" >&2
    exit 1
}

if [[ $SRC_DIR =~ bin/?$ ]]; then
    HARE_BASE_DIR=$SRC_DIR/..
else
    # TODO: '/opt/seagate/cortx/hare' prefix can be different, e.g. '/usr'
    HARE_BASE_DIR=/opt/seagate/cortx/hare
    [[ -d $HARE_BASE_DIR && -e $HARE_BASE_DIR/bin/hctl ]] ||
        die 'Hare is not installed, please run `make devinstall`.'
fi

if [[ -d $SRC_DIR/.py3venv ]]; then
    source "$SRC_DIR/.py3venv/bin/activate"
fi

usage() {
    # NB: `local var=$(func)` expression ignores exit status of `func`
    # and always succeeds.
    local commands  # do not assign the value here
    commands=$(commands_usage)
    cat <<EOF
Usage: $PROG <command> [options]

Interact with Motr cluster.

Commands:

$commands

    help        Show this help and exit.
EOF
}

command_help() (
    local exec=$1
    local tag='# :help: '

    # Note, that these `die` statements don't terminate the script.
    case $(grep -c "^$tag" $exec) in
        0) die "$exec: '$tag' line is missing" ;;
        1) grep -Po "(?<=^$tag).*" $exec ;;
        *) die "$exec: there can be only one '$tag' line" ;;
    esac
)

commands_usage() {
    local -a lines
    local name help line
    local ok=true
    for exec in $HARE_BASE_DIR/libexec/hare-*; do
        name=${exec##*/hare-}
        help=$(command_help $exec) || ok=false
        lines+=("$(echo -e "    $name\t$help")")
    done
    $ok || return 1

    for line in "${lines[@]}"; do
        echo "$line"  # quotes are needed
    done
}

# parse CLI options
while true ; do
    case $1 in
        -h|--help|help) usage; exit ;;
        -*) die "Unknown option '$1'; see \`$PROG help\`" ;;
        *)  cmd=${1:-help} ; shift || true ; break ;;
    esac
    shift
done

is_systemd_enabled() {
   if [[ `ps --no-headers -o comm 1` == systemd ]]; then
       true
   else
       false
   fi
}

# process commands
case $cmd in
    help) usage; exit ;;
    bootstrap|start|reportbug|shutdown|status|drive-state|node-join|fetch-fids|\
    rebalance|repair)
        if [[ -d $M0_SRC_DIR/utils ]]; then
            PATH="$M0_SRC_DIR/utils:$PATH"
        fi
        PATH="$HARE_BASE_DIR/libexec:$PATH"
        PATH="$HARE_BASE_DIR/bin:$PATH"
        export PATH

        # TODO: python3.6 version can be different
        PYTHONPATH="$HARE_BASE_DIR/lib/python3.6/site-packages"
        PYTHONPATH="$HARE_BASE_DIR/lib64/python3.6/site-packages:$PYTHONPATH"
        export PYTHONPATH

        if $(is_systemd_enabled); then
            systemd-cat --identifier $PROG <<< "$PROG $cmd $@"
        fi
        exec $HARE_BASE_DIR/libexec/hare-$cmd "$@"
        ;;
    node)
        # This is a temporary solution. Will be removed by the results of https://github.com/Seagate/cortx-hare/pull/1160
        # After that the whole case block is TO BE REMOVED
        if [[ -d $M0_SRC_DIR/utils ]]; then
            PATH="$M0_SRC_DIR/utils:$PATH"
        fi
        PATH="$CORTX_HA_BIN:$PATH"
        PATH="$HARE_BASE_DIR/libexec:$PATH"
        PATH="$HARE_BASE_DIR/bin:$PATH"
        export PATH

        # TODO: python3.6 version can be different
        PYTHONPATH="$HARE_BASE_DIR/lib/python3.6/site-packages"
        PYTHONPATH="$HARE_BASE_DIR/lib64/python3.6/site-packages:$PYTHONPATH"
        PYTHONPATH="$PYTHONPATH:$CORTX_HA_PY_INCLUDES"
        export PYTHONPATH

        if $(is_systemd_enabled); then
            systemd-cat --identifier $PROG <<< "$PROG $cmd $@"
        fi
        exec $HARE_BASE_DIR/libexec/hare-$cmd "$@"
        ;;
    *) die "Unknown command: '$cmd'" ;;
esac