dev_cli.sh

#!/usr/bin/env bash

# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# Copyright © 2020 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

CLI_NAME="Cloud Hypervisor"

CTR_IMAGE_TAG="ghcr.io/cloud-hypervisor/cloud-hypervisor"
CTR_IMAGE_VERSION="20231220-0"
: "${CTR_IMAGE:=${CTR_IMAGE_TAG}:${CTR_IMAGE_VERSION}}"

DOCKER_RUNTIME="docker"

# Host paths
CLH_SCRIPTS_DIR=$(cd "$(dirname "$0")" && pwd)
CLH_ROOT_DIR=$(cd "${CLH_SCRIPTS_DIR}/.." && pwd)
CLH_BUILD_DIR="${CLH_ROOT_DIR}/build"
CLH_CARGO_TARGET="${CLH_BUILD_DIR}/cargo_target"
CLH_DOCKERFILE="${CLH_SCRIPTS_DIR}/../resources/Dockerfile"
CLH_CTR_BUILD_DIR="/tmp/cloud-hypervisor/ctr-build"
CLH_INTEGRATION_WORKLOADS="${HOME}/workloads"

# Container paths
CTR_CLH_ROOT_DIR="/cloud-hypervisor"
CTR_CLH_CARGO_BUILT_DIR="${CTR_CLH_ROOT_DIR}/build"
CTR_CLH_CARGO_TARGET="${CTR_CLH_CARGO_BUILT_DIR}/cargo_target"
CTR_CLH_INTEGRATION_WORKLOADS="/root/workloads"

# Container networking option
CTR_CLH_NET="bridge"

# Cargo paths
# Full path to the cargo registry dir on the host. This appears on the host
# because we want to persist the cargo registry across container invocations.
# Otherwise, any rust crates from crates.io would be downloaded again each time
# we build or test.
CARGO_REGISTRY_DIR="${CLH_BUILD_DIR}/cargo_registry"

# Full path to the cargo git registry on the host. This serves the same purpose
# as CARGO_REGISTRY_DIR, for crates downloaded from GitHub repos instead of
# crates.io.
CARGO_GIT_REGISTRY_DIR="${CLH_BUILD_DIR}/cargo_git_registry"

# Full path to the cargo target dir on the host.
CARGO_TARGET_DIR="${CLH_BUILD_DIR}/cargo_target"

# Send a decorated message to stdout, followed by a new line
#
say() {
    [ -t 1 ] && [ -n "$TERM" ] &&
        echo "$(tput setaf 2)[$CLI_NAME]$(tput sgr0) $*" ||
        echo "[$CLI_NAME] $*"
}

# Send a decorated message to stdout, without a trailing new line
#
say_noln() {
    [ -t 1 ] && [ -n "$TERM" ] &&
        echo -n "$(tput setaf 2)[$CLI_NAME]$(tput sgr0) $*" ||
        echo "[$CLI_NAME] $*"
}

# Send a text message to stderr
#
say_err() {
    [ -t 2 ] && [ -n "$TERM" ] &&
        echo "$(tput setaf 1)[$CLI_NAME] $*$(tput sgr0)" 1>&2 ||
        echo "[$CLI_NAME] $*" 1>&2
}

# Send a warning-highlighted text to stdout
say_warn() {
    [ -t 1 ] && [ -n "$TERM" ] &&
        echo "$(tput setaf 3)[$CLI_NAME] $*$(tput sgr0)" ||
        echo "[$CLI_NAME] $*"
}

# Exit with an error message and (optional) code
# Usage: die [-c <error code>] <error message>
#
die() {
    code=1
    [[ "$1" = "-c" ]] && {
        code="$2"
        shift 2
    }
    say_err "$@"
    exit "$code"
}

# Exit with an error message if the last exit code is not 0
#
ok_or_die() {
    code=$?
    [[ $code -eq 0 ]] || die -c $code "$@"
}

# Make sure the build/ dirs are available. Exit if we can't create them.
# Upon returning from this call, the caller can be certain the build/ dirs exist.
#
ensure_build_dir() {
    for dir in "$CLH_BUILD_DIR" \
        "$CLH_INTEGRATION_WORKLOADS" \
        "$CLH_CTR_BUILD_DIR" \
        "$CARGO_TARGET_DIR" \
        "$CARGO_REGISTRY_DIR" \
        "$CARGO_GIT_REGISTRY_DIR"; do
        mkdir -p "$dir" || die "Error: cannot create dir $dir"
        [ -x "$dir" ] && [ -w "$dir" ] ||
            {
                say "Wrong permissions for $dir. Attempting to fix them ..."
                chmod +x+w "$dir"
            } ||
            die "Error: wrong permissions for $dir. Should be +x+w"
    done
}

# Make sure we're using the latest dev container, by just pulling it.
ensure_latest_ctr() {
    if [ "$CTR_IMAGE_VERSION" = "local" ]; then
        build_container
    else
        $DOCKER_RUNTIME pull "$CTR_IMAGE"

        if [ $? -ne 0 ]; then
            build_container
        fi

        ok_or_die "Error pulling/building container image. Aborting."
    fi
}

# Fix main directory permissions after a container ran as root.
# Since the container ran as root, any files it creates will be owned by root.
# This fixes that by recursively changing the ownership of /cloud-hypervisor to the
# current user.
#
fix_dir_perms() {
    # Yes, running Docker to get elevated privileges, just to chown some files
    # is a dirty hack.
    $DOCKER_RUNTIME run \
        --workdir "$CTR_CLH_ROOT_DIR" \
        --rm \
        --volume /dev:/dev \
        --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
        "$CTR_IMAGE" \
        chown -R "$(id -u):$(id -g)" "$CTR_CLH_ROOT_DIR"

    return "$1"
}
# Process exported volumes argument, separate the volumes and make docker compatible
# Sample input: --volumes /a:/a#/b:/b
# Sample output: --volume /a:/a --volume /b:/b
#
process_volumes_args() {
    if [ -z "$arg_vols" ]; then
        return
    fi
    exported_volumes=""
    arr_vols=(${arg_vols//#/ })
    for var in "${arr_vols[@]}"; do
        parts=(${var//:/ })
        if [[ ! -e "${parts[0]}" ]]; then
            echo "The volume ${parts[0]} does not exist."
            exit 1
        fi
        exported_volumes="$exported_volumes --volume $var"
    done
}

cmd_help() {
    echo ""
    echo "Cloud Hypervisor $(basename "$0")"
    echo "Usage: $(basename "$0") [flags] <command> [<command args>]"
    echo ""
    echo "Available flags":
    echo ""
    echo "    --local        Set the container image version being used to \"local\"."
    echo ""
    echo "Available commands:"
    echo ""
    echo "    build [--debug|--release] [--libc musl|gnu] [-- [<cargo args>]]"
    echo "        Build the Cloud Hypervisor binaries."
    echo "        --debug               Build the debug binaries. This is the default."
    echo "        --release             Build the release binaries."
    echo "        --libc                Select the C library Cloud Hypervisor will be built against. Default is gnu"
    echo "        --volumes             Hash separated volumes to be exported. Example --volumes /mnt:/mnt#/myvol:/myvol"
    echo "        --hypervisor          Underlying hypervisor. Options kvm, mshv"
    echo ""
    echo "    tests [<test type (see below)>] [--libc musl|gnu] [-- [<test scripts args>] [-- [<test binary args>]]] "
    echo "        Run the Cloud Hypervisor tests."
    echo "        --unit                       Run the unit tests."
    echo "        --integration                Run the integration tests."
    echo "        --integration-sgx            Run the SGX integration tests."
    echo "        --integration-vfio           Run the VFIO integration tests."
    echo "        --integration-windows        Run the Windows guest integration tests."
    echo "        --integration-live-migration Run the live-migration integration tests."
    echo "        --integration-rate-limiter   Run the rate-limiter integration tests."
    echo "        --libc                       Select the C library Cloud Hypervisor will be built against. Default is gnu"
    echo "        --metrics                    Generate performance metrics"
    echo "        --volumes                    Hash separated volumes to be exported. Example --volumes /mnt:/mnt#/myvol:/myvol"
    echo "        --hypervisor                 Underlying hypervisor. Options kvm, mshv"
    echo "        --all                        Run all tests."
    echo ""
    echo "    build-container [--type]"
    echo "        Build the Cloud Hypervisor container."
    echo ""
    echo "    clean [<cargo args>]]"
    echo "        Remove the Cloud Hypervisor artifacts."
    echo ""
    echo "    shell"
    echo "        Run the development container into an interactive, privileged BASH shell."
    echo "        --volumes             Hash separated volumes to be exported. Example --volumes /mnt:/mnt#/myvol:/myvol"
    echo ""
    echo "    help"
    echo "        Display this help message."
    echo ""
}

cmd_build() {
    build="debug"
    libc="gnu"
    hypervisor="kvm"
    features_build=""
    exported_device="/dev/kvm"
    while [ $# -gt 0 ]; do
        case "$1" in
        "-h" | "--help") {
            cmd_help
            exit 1
        } ;;
        "--debug") { build="debug"; } ;;
        "--release") { build="release"; } ;;
        "--runtime")
	    shift
	    DOCKER_RUNTIME="$1"
	    export DOCKER_RUNTIME
	    ;;
        "--libc")
            shift
            [[ "$1" =~ ^(musl|gnu)$ ]] ||
                die "Invalid libc: $1. Valid options are \"musl\" and \"gnu\"."
            libc="$1"
            ;;
        "--volumes")
            shift
            arg_vols="$1"
            ;;
        "--hypervisor")
            shift
            hypervisor="$1"
            ;;
        "--features")
            shift
            features_build="--features $1"
            ;;
        "--") {
            shift
            break
        } ;;
        *)
            die "Unknown build argument: $1. Please use --help for help."
            ;;
        esac
        shift
    done

    ensure_build_dir
    ensure_latest_ctr

    process_volumes_args
    if [[ ! ("$hypervisor" = "kvm" || "$hypervisor" = "mshv") ]]; then
        die "Hypervisor value must be kvm or mshv"
    fi
    if [[ "$hypervisor" = "mshv" ]]; then
        exported_device="/dev/mshv"
    fi
    target="$(uname -m)-unknown-linux-${libc}"

    cargo_args=("$@")
    [ $build = "release" ] && cargo_args+=("--release")
    cargo_args+=(--target "$target")

    rustflags="$RUSTFLAGS"
    target_cc=""
    if [ "$(uname -m)" = "aarch64" ] && [ "$libc" = "musl" ]; then
        rustflags="$rustflags -C link-args=-Wl,-Bstatic -C link-args=-lc"
    fi

    $DOCKER_RUNTIME run \
        --user "$(id -u):$(id -g)" \
        --workdir "$CTR_CLH_ROOT_DIR" \
        --rm \
        --volume $exported_device \
        --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
        --env RUSTFLAGS="$rustflags" \
        --env TARGET_CC="$target_cc" \
        "$CTR_IMAGE" \
        cargo build --all $features_build \
        --target-dir "$CTR_CLH_CARGO_TARGET" \
        "${cargo_args[@]}" && say "Binaries placed under $CLH_CARGO_TARGET/$target/$build"
}

cmd_clean() {
    cargo_args=("$@")

    ensure_build_dir
    ensure_latest_ctr

    $DOCKER_RUNTIME run \
        --user "$(id -u):$(id -g)" \
        --workdir "$CTR_CLH_ROOT_DIR" \
        --rm \
        --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
        "$CTR_IMAGE" \
        cargo clean \
        --target-dir "$CTR_CLH_CARGO_TARGET" \
        "${cargo_args[@]}"
}

cmd_tests() {
    unit=false
    integration=false
    integration_sgx=false
    integration_vfio=false
    integration_windows=false
    integration_live_migration=false
    integration_rate_limiter=false
    metrics=false
    libc="gnu"
    arg_vols=""
    hypervisor="kvm"
    exported_device="/dev/kvm"
    while [ $# -gt 0 ]; do
        case "$1" in
        "-h" | "--help") {
            cmd_help
            exit 1
        } ;;
        "--unit") { unit=true; } ;;
        "--integration") { integration=true; } ;;
        "--integration-sgx") { integration_sgx=true; } ;;
        "--integration-vfio") { integration_vfio=true; } ;;
        "--integration-windows") { integration_windows=true; } ;;
        "--integration-live-migration") { integration_live_migration=true; } ;;
        "--integration-rate-limiter") { integration_rate_limiter=true; } ;;
        "--metrics") { metrics=true; } ;;
        "--libc")
            shift
            [[ "$1" =~ ^(musl|gnu)$ ]] ||
                die "Invalid libc: $1. Valid options are \"musl\" and \"gnu\"."
            libc="$1"
            ;;
        "--volumes")
            shift
            arg_vols="$1"
            ;;
        "--hypervisor")
            shift
            hypervisor="$1"
            ;;
        "--all") {
            cargo=true
            unit=true
            integration=true
        } ;;
        "--") {
            shift
            break
        } ;;
        *)
            die "Unknown tests argument: $1. Please use --help for help."
            ;;
        esac
        shift
    done
    if [[ ! ("$hypervisor" = "kvm" || "$hypervisor" = "mshv") ]]; then
        die "Hypervisor value must be kvm or mshv"
    fi

    if [[ "$hypervisor" = "mshv" ]]; then
        exported_device="/dev/mshv"
    fi

    if [ ! -e "${exported_device}" ] ; then
        die "${exported_device} does not exist on the system"
    fi

    set -- '--hypervisor' "$hypervisor" "$@"

    ensure_build_dir
    ensure_latest_ctr

    process_volumes_args
    target="$(uname -m)-unknown-linux-${libc}"

    rustflags="$RUSTFLAGS"
    target_cc=""
    if [ "$(uname -m)" = "aarch64" ] && [ "$libc" = "musl" ]; then
        rustflags="$rustflags -C link-args=-Wl,-Bstatic -C link-args=-lc"
    fi

    if [[ "$unit" = true ]]; then
        say "Running unit tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --device $exported_device \
            --device /dev/net/tun \
            --cap-add net_admin \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            "$CTR_IMAGE" \
            ./scripts/run_unit_tests.sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$integration" = true ]; then
        say "Running integration tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            dbus-run-session ./scripts/run_integration_tests_"$(uname -m)".sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$integration_sgx" = true ]; then
        say "Running SGX integration tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            ./scripts/run_integration_tests_sgx.sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$integration_vfio" = true ]; then
        say "Running VFIO integration tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            ./scripts/run_integration_tests_vfio.sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$integration_windows" = true ]; then
        say "Running Windows integration tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            ./scripts/run_integration_tests_windows_"$(uname -m)".sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$integration_live_migration" = true ]; then
        say "Running 'live migration' integration tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            ./scripts/run_integration_tests_live_migration.sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$integration_rate_limiter" = true ]; then
        say "Running 'rate limiter' integration tests for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            ./scripts/run_integration_tests_rate_limiter.sh "$@" || fix_dir_perms $? || exit $?
    fi

    if [ "$metrics" = true ]; then
        say "Generating performance metrics for $target..."
        $DOCKER_RUNTIME run \
            --workdir "$CTR_CLH_ROOT_DIR" \
            --rm \
            --privileged \
            --security-opt seccomp=unconfined \
            --ipc=host \
            --net="$CTR_CLH_NET" \
            --mount type=tmpfs,destination=/tmp \
            --volume /dev:/dev \
            --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
            --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
            --env USER="root" \
            --env BUILD_TARGET="$target" \
            --env RUSTFLAGS="$rustflags" \
            --env TARGET_CC="$target_cc" \
            --env RUST_BACKTRACE="${RUST_BACKTRACE}" \
            --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
            "$CTR_IMAGE" \
            ./scripts/run_metrics.sh "$@" || fix_dir_perms $? || exit $?
    fi

    fix_dir_perms $?
}

build_container() {
    ensure_build_dir

    BUILD_DIR=/tmp/cloud-hypervisor/container/

    mkdir -p $BUILD_DIR
    cp "$CLH_DOCKERFILE" $BUILD_DIR

    [ "$(uname -m)" = "aarch64" ] && TARGETARCH="arm64"
    [ "$(uname -m)" = "x86_64" ] && TARGETARCH="amd64"

    $DOCKER_RUNTIME build \
        --target dev \
        -t $CTR_IMAGE \
        -f $BUILD_DIR/Dockerfile \
        --build-arg TARGETARCH=$TARGETARCH \
        $BUILD_DIR
}

cmd_build-container() {
    while [ $# -gt 0 ]; do
        case "$1" in
        "-h" | "--help") {
            cmd_help
            exit 1
        } ;;
        "--") {
            shift
            break
        } ;;
        *)
            die "Unknown build-container argument: $1. Please use --help for help."
            ;;
        esac
        shift
    done

    build_container
}

cmd_shell() {
    while [ $# -gt 0 ]; do
        case "$1" in
        "-h" | "--help") {
            cmd_help
            exit 1
        } ;;
        "--volumes")
            shift
            arg_vols="$1"
            ;;
        "--") {
            shift
            break
        } ;;
        *) ;;

        esac
        shift
    done
    ensure_build_dir
    ensure_latest_ctr
    process_volumes_args
    say_warn "Starting a privileged shell prompt as root ..."
    say_warn "WARNING: Your $CLH_ROOT_DIR folder will be bind-mounted in the container under $CTR_CLH_ROOT_DIR"
    $DOCKER_RUNTIME run \
        -ti \
        --workdir "$CTR_CLH_ROOT_DIR" \
        --rm \
        --privileged \
        --security-opt seccomp=unconfined \
        --ipc=host \
        --net="$CTR_CLH_NET" \
        --tmpfs /tmp:exec \
        --volume /dev:/dev \
        --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" $exported_volumes \
        --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
        --env USER="root" \
        --entrypoint bash \
        "$CTR_IMAGE"

    fix_dir_perms $?
}

if [ $# = 0 ]; then
    cmd_help
    say_err "Please specify command to run!"
    exit 1
fi

# Parse main command line args.
#
while [ $# -gt 0 ]; do
    case "$1" in
    -h | --help) {
        cmd_help
        exit 1
    } ;;
    --local) {
        CTR_IMAGE_VERSION="local"
        CTR_IMAGE="${CTR_IMAGE_TAG}:${CTR_IMAGE_VERSION}"
    } ;;
    -*)
        die "Unknown arg: $1. Please use \`$0 help\` for help."
        ;;
    *)
        break
        ;;
    esac
    shift
done

# $1 is now a command name. Check if it is a valid command and, if so,
# run it.
#
declare -f "cmd_$1" >/dev/null
ok_or_die "Unknown command: $1. Please use \`$0 help\` for help."

cmd=cmd_$1
shift

$cmd "$@"