#!/bin/bash

this_dir="$( cd "$( dirname "${BASH_SOURCE[0]}"  )" >/dev/null 2>&1 && pwd )"
occlum_dir="$( cd "$( dirname "$this_dir/../../../"  )" >/dev/null 2>&1 && pwd )"
build_makefile=$occlum_dir/build/bin/occlum_build.mk

if [[ "$occlum_dir" == "/opt/occlum" ]]; then
    version_header=$occlum_dir/include/occlum_version.h
    occlum_sgx_env=$occlum_dir/sgxsdk-tools/environment
else
    version_header=$occlum_dir/src/pal/include/occlum_version.h
    occlum_sgx_env=$occlum_dir/etc/environment
fi

# For deployment environment, version header file may not exist
if [ -f "$version_header" ]; then
    major_ver=`grep '\#define OCCLUM_MAJOR_VERSION' $version_header |  awk '{print $3}'`
    minor_ver=`grep '\#define OCCLUM_MINOR_VERSION' $version_header |  awk '{print $3}'`
    patch_ver=`grep '\#define OCCLUM_PATCH_VERSION' $version_header |  awk '{print $3}'`
    occlum_version="$major_ver.$minor_ver.$patch_ver"
fi

instance_dir=`pwd`

status_file=$instance_dir/.__occlum_status

# For deployment environment, env for sgx-sdk may not exist
if [ -f "$occlum_sgx_env" ]; then
    source $occlum_sgx_env
    SGX_GDB="$SGX_SDK/bin/sgx-gdb"
    ENCLAVE_SIGN_TOOL="$SGX_SDK/bin/x64/sgx_sign"
    ENCLAVE_SIGN_KEY="$occlum_dir/etc/template/Enclave.pem"
fi

get_enclave_debuggable_flag() {
    jq '.metadata.debuggable' $instance_dir/Occlum.json
}

exit_error() {
    echo "Error: $@" >&2
    exit 1
}

report_arg_error() {
    echo $1 >&2
    echo ""
    cat <<EOF
Usage:
    occlum new <path>
        Create a new directory at <path> and initialize as the Occlum instance.

    occlum init
        Initialize a directory as the Occlum instance.

    occlum build [--sign-key <key_path>] [--sign-tool <tool_path>] [--image-key <key_path>] [--buildin-image-key] [-f/--force]
        Build and sign an Occlum SGX enclave (.so) and generate its associated secure
        FS image according to the user-provided image directory and Occlum.json config file.
        The whole building process is incremental: the building artifacts are built only
        when needed.
        To force rebuilding all artifacts, give the [-f/--force] flag.

    occlum run <program_name> <program_args>
        Run the user program inside an SGX enclave.

    occlum package [<package_name>.tar.gz]
        Generate a minimal, self-contained package (.tar.gz) for the Occlum instance.
        The resulting package can then be copied to a deployment environment and unpacked
        as a runnable Occlum instance.
        All runtime dependencies required by the Occlum instance---except Intel SGX driver,
        enable_rdfsbase kernel module, and Intel SGX PSW---are included in the package.
        If package_name is not specified, the directory name of Occlum instance will be used.

    occlum gdb <program_name> <program_args>
        Debug the program running inside an SGX enclave with GDB.

    occlum mount [--sign-key <key_path>] [--sign-tool <tool_path>] [--image-key <key_path>] <path>
        Mount the secure FS image of the Occlum instance as a Linux FS at an existing <path>.
        This makes it easy to access and manipulate Occlum's secure FS for debug purpose.

    occlum gen-image-key <key_path>
        Generate a file consists of a randomly generated 128-bit key for encryption of the FS image.
EOF
}

check_has_init() {
    if [ ! -f "$status_file"  ]; then
        echo "Error: the current working directory is not initialized as an Occlum instance. Need to run \"occlum init\" first."
        exit 1
    fi
}

check_has_built() {
    check_has_init

    if [ ! -d "$instance_dir/run/mount/__ROOT"  ]; then
        echo "Error: the Occlum image and enclave are not built yet. Need to run \"occlum build\" first."
        exit 1
    fi
}

check_has_run() {
    if pgrep --full "$instance_dir/build/bin/occlum-run" > /dev/null ; then
        echo "Error: the process of current Occlum instance is running. Need to wait for the process to finish or kill it first."
        exit 1
    fi
}

check_aesm_service() {
    # Ignore AESM service status for simulation mode
    if [ "$(cat $instance_dir/.sgx_mode 2>/dev/null)" != "HW" ]; then
        return
    fi

    AESM_SOCKET_FILE=/var/run/aesmd/aesm.socket
    for i in $(seq 1 3); do
        if [ -S "$AESM_SOCKET_FILE" ]; then
            return
        else
            sleep 5
        fi
    done
    echo "Error: AESM service is not started yet. Need to start it first"
    exit 1
}

cmd_new() {
    if [ -z $@ ]; then
        echo "Error: target directory is not set"
        exit 1
    fi

    dir_path="$@"
    if [[ "$dir_path" != "/"* ]]; then
        dir_path="$instance_dir/$@"
    fi

    if [[ -e "$dir_path" ]]; then
        echo "Error: destination \"$dir_path\" already exists"
        exit 1
    fi

    mkdir -p $dir_path
    instance_dir=$dir_path
    status_file=$instance_dir/.__occlum_status
    cd $dir_path && cmd_init
}

cmd_init() {
    if [ -f "$status_file"  ]; then
        echo "Error: the current working directory has been initialized as an Occlum instance"
        exit 1
    fi

    echo "initialized" > $status_file

    cd "$instance_dir"
    mkdir -p image
    mkdir -p image/bin
    mkdir -p image/lib
    mkdir -p image/lib64
    mkdir -p image/root
    mkdir -p image/host
    mkdir -p image/tmp
    mkdir -p image/dev
    mkdir -p image/proc
    mkdir -p image/etc
    local occlum_glibc_lib=/opt/occlum/glibc/lib
    local occlum_glibc_etc=/opt/occlum/glibc/etc
    local cpu_lib=/sys/devices/system/cpu
    if [ -d "$occlum_glibc_lib" ]; then
        mkdir -p "image/$occlum_glibc_lib"
        mkdir -p "image/$cpu_lib"
        mkdir -p "image/$occlum_glibc_etc"
    fi
    # add default /etc/hosts
    echo "127.0.0.1   localhost" > image/etc/hosts
    # add default timezone file
    cp /etc/localtime image/etc/

    # add musl
    local occlum_musl_lib=/usr/local/occlum/x86_64-linux-musl/lib
    cp -t image/lib \
        /lib/ld-musl-x86_64.so.1 \
        "$occlum_musl_lib/libc.so" \
        "$occlum_musl_lib/libstdc++.so.6" \
        "$occlum_musl_lib/libgcc_s.so.1" \
        "$occlum_musl_lib/libgomp.so.1"

    # add glibc
    if [ -d "$occlum_glibc_lib" ]; then
        cp -t image/lib64 \
            "$occlum_glibc_lib/ld-linux-x86-64.so.2"
        ln -sf /lib64/ld-linux-x86-64.so.2 "image/$occlum_glibc_lib/ld-linux-x86-64.so.2"
        cp -t "image/$occlum_glibc_lib" \
            "$occlum_glibc_lib/libc.so.6" \
            "$occlum_glibc_lib/libpthread.so.0" \
            "$occlum_glibc_lib/libm.so.6"
        local os_release=`awk -F= '/^NAME/{print $2}' /etc/os-release`
        if [ "$os_release" == "\"Ubuntu\"" ]; then
            cp -t "image/$occlum_glibc_lib" \
                "/usr/lib/x86_64-linux-gnu/libstdc++.so.6" \
                "/lib/x86_64-linux-gnu/libgcc_s.so.1"
        else
            cp -t "image/$occlum_glibc_lib" \
                "/usr/lib64/libstdc++.so.6" \
                "/usr/lib64/libgcc_s.so.1"
        fi
        cp -t "image/$occlum_glibc_etc" \
            /etc/localtime
        cp -t "image/$cpu_lib" \
            "$cpu_lib/online"
    fi

    mkdir -p initfs
    mkdir -p initfs/bin
    mkdir -p initfs/lib
    mkdir -p initfs/dev
    mkdir -p initfs/proc
    mkdir -p initfs/etc
    # add default /etc/hosts
    echo "127.0.0.1   localhost" > initfs/etc/hosts
    # add default timezone file
    cp /etc/localtime initfs/etc/

    # add musl
    local occlum_musl_lib=/usr/local/occlum/x86_64-linux-musl/lib
    cp -t initfs/lib \
        /lib/ld-musl-x86_64.so.1 \
        "$occlum_musl_lib/libc.so" \
        "$occlum_musl_lib/libstdc++.so.6" \
        "$occlum_musl_lib/libgcc_s.so.1" \
        "$occlum_musl_lib/libgomp.so.1"

    cp "$occlum_dir"/build/bin/init initfs/bin/

    cp "$occlum_dir"/etc/template/Occlum.json "$instance_dir"/
    chmod 644 "$instance_dir"/Occlum.json

    echo "$instance_dir initialized as an Occlum instance"
}

cmd_build() {
    check_has_init

    pal_lib=libocclum-pal.so
    libos_lib=libocclum-libos.so
    BUILDIN_IMAGE_KEY=false

    while [ -n "$1" ]; do
        case "$1" in
        --sign-key)     [ -n "$2" ] && ENCLAVE_SIGN_KEY=$2 ; shift 2 || exit_error "empty signing key path"     ;;
        --sign-tool)    [ -n "$2" ] && ENCLAVE_SIGN_TOOL=$2 ; shift 2 || exit_error "empty signing tool path"   ;;
        --sgx-mode)     [[ -n "$2" && "$2" != "HW" ]] && export SGX_MODE=SIM ; shift 2 || exit_error "empty sgx mode";;
        --image-key)    [ -n "$2" ] && SECURE_IMAGE_KEY=$2 ; shift 2 || exit_error "empty secure image key path"   ;;
        --buildin-image-key)  BUILDIN_IMAGE_KEY=true ; shift ;;
        --force | -f)   MAKE_OPTION="clean" ; shift ;;
        *) exit_error "Unknown option: $1"                                                                      ;;
        esac
    done
    [ -e "$ENCLAVE_SIGN_KEY" ] || exit_error "invalid signing key path: $ENCLAVE_SIGN_KEY"
    [ -e "$ENCLAVE_SIGN_TOOL" ] || exit_error "invalid signing tool path: $ENCLAVE_SIGN_TOOL"
    if [ -n "$SECURE_IMAGE_KEY" ]; then
        [ -e "$SECURE_IMAGE_KEY" ] || exit_error "invalid secure image key path: $SECURE_IMAGE_KEY"
    fi
    echo "Enclave sign-tool: $ENCLAVE_SIGN_TOOL"
    echo "Enclave sign-key: $ENCLAVE_SIGN_KEY"
    [ -n "$SECURE_IMAGE_KEY" ] && echo "Image encryption key: $SECURE_IMAGE_KEY"

    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$SGX_SDK/sdk_libs
        pal_lib=libocclum-pal_sim.so
        libos_lib=libocclum-libos_sim.so
        echo "SGX mode: $SGX_MODE"
    else
        echo "SGX mode: HW"
    fi

    # If sgx mode is changed, build thoroughly again
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        if [ "$(cat $instance_dir/.sgx_mode 2>/dev/null)" != "SIM" ]; then
            MAKE_OPTION="clean"
        fi
    else
        #HW mode
        if [ "$(cat $instance_dir/.sgx_mode 2>/dev/null)" != "HW" ]; then
            MAKE_OPTION="clean"
        fi
    fi

    rm -rf "$instance_dir/run"
    if [[ -n $MAKE_OPTION ]]; then
        occlum_dir=$occlum_dir instance_dir=$instance_dir \
        make -f $build_makefile $MAKE_OPTION
    fi
    occlum_dir=$occlum_dir instance_dir=$instance_dir pal_lib=$pal_lib major_ver=$major_ver \
    occlum_version=$occlum_version libos_lib=$libos_lib \
    ENCLAVE_SIGN_KEY=$ENCLAVE_SIGN_KEY ENCLAVE_SIGN_TOOL=$ENCLAVE_SIGN_TOOL \
    SECURE_IMAGE_KEY=$SECURE_IMAGE_KEY BUILDIN_IMAGE_KEY=$BUILDIN_IMAGE_KEY \
    make -f $build_makefile --no-builtin-rules

    cd "$instance_dir"
    echo "built" > $status_file

    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        echo "SIM" > .sgx_mode
    else
        echo "HW" > .sgx_mode
    fi

    mkdir -p "$instance_dir/run/mount/__ROOT"
    mkdir -p "$instance_dir/run/mount/tmp"

    mkdir -p "$instance_dir/run/initfs/__ROOT"

    echo "Built the Occlum image and enclave successfully"
}

cmd_run() {
    check_has_built
    check_has_run
    check_aesm_service

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$instance_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$instance_dir/build/lib"
    fi

    echo "running" > $status_file

    if [ "`get_enclave_debuggable_flag`" == "false" ]; then
        export OCCLUM_RELEASE_ENCLAVE=1
    fi
    RUST_BACKTRACE=1 "$instance_dir/build/bin/occlum-run" "$@"

    echo "built" > $status_file
}

cmd_start() {
    check_has_built
    check_aesm_service

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$instance_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$instance_dir/build/lib"
    fi

    echo "running" > $status_file

    if [ "`get_enclave_debuggable_flag`" == "false" ]; then
        export OCCLUM_RELEASE_ENCLAVE=1
    fi
    RUST_BACKTRACE=1 "$instance_dir/build/bin/occlum_exec_client" start

    echo "built" > $status_file
}

cmd_exec() {
    check_has_built

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$instance_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$instance_dir/build/lib"
    fi

    echo "running" > "$status_file"

    RUST_BACKTRACE=1 "$instance_dir/build/bin/occlum_exec_client" exec -- "$@"

    echo "built" > "$status_file"
}

cmd_stop() {
    check_has_built

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$instance_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$instance_dir/build/lib"
    fi

    echo "running" > "$status_file"

    RUST_BACKTRACE=1 "$instance_dir/build/bin/occlum_exec_client" stop -t 0

    echo "built" > "$status_file"
}

cmd_package() {
    check_has_built

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        echo '"occlum package" command should only be used for an Occlum instance of SGX hardware mode, not the simulation mode.'
        echo 'Please run "occlum build --sgx-mode HW" and then use "occlum package"'
        exit 1
    fi

    instance_base_name=$(basename $instance_dir)
    if [[ -z "$@" ]]; then
        package_name="$instance_base_name.tar.gz"
    else
        if [[ "$@" == *.tar.gz ]];then
            package_name="$@"
        else
            package_name="$@.tar.gz"
        fi
    fi

    rm -f $package_name

    cd .. && tar -cvzf $instance_dir/$package_name $instance_base_name/Occlum.json $instance_base_name/build/bin \
        $instance_base_name/build/lib/libocclum-libos.signed.so $instance_base_name/build/lib/libocclum-pal.so* \
        $instance_base_name/build/mount $instance_base_name/build/Occlum.json.protected \
        $instance_base_name/build/initfs $instance_base_name/build/.Occlum_sys.json.protected \
        $instance_base_name/initfs $instance_base_name/run \
        $instance_base_name/.__occlum_status $instance_base_name/.sgx_mode

    if [ "`get_enclave_debuggable_flag`" == "true" ]; then
        echo 'Warning: current Occlum instance is configured as "debuggable".'
        echo '(If it is not expected, you can modify the Occlum.json "metadata" - "debuggable" field to "false" and build again. And then use "occlum package")'
    fi

    echo "The package $package_name is generated successfully"
}

cmd_gdb() {
    check_has_built

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$instance_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$instance_dir/build/lib"
    fi

    echo "debugging" > "$status_file"

    OCCLUM_GDB=1 $SGX_GDB --args "$instance_dir/build/bin/occlum-run" "$@"

    echo "built" > "$status_file"
}

cmd_mount() {
    check_has_built

    while [ -n "$1" ]; do
        case "$1" in
        --sign-key)     [ -n "$2" ] && ENCLAVE_SIGN_KEY=$2 ; shift 2 || exit_error "empty signing key path"     ;;
        --sign-tool)    [ -n "$2" ] && ENCLAVE_SIGN_TOOL=$2 ; shift 2 || exit_error "empty signing tool path"   ;;
        --image-key)    [ -n "$2" ] && SECURE_IMAGE_KEY=$2 ; shift 2 || exit_error "empty secure image key path"   ;;
        *) MNT_POINT=$1 ; shift ;;
        esac
    done
    [ -e "$ENCLAVE_SIGN_KEY" ] || exit_error "invalid signing key path: $ENCLAVE_SIGN_KEY"
    [ -e "$ENCLAVE_SIGN_TOOL" ] || exit_error "invalid signing tool path: $ENCLAVE_SIGN_TOOL"
    if [ -n "$SECURE_IMAGE_KEY" ]; then
        [ -e "$SECURE_IMAGE_KEY" ] || exit_error "invalid secure image key path: $SECURE_IMAGE_KEY"
    fi
    [ -d "$MNT_POINT" ] || exit_error "invalid mount point: $MNT_POINT"
    echo "Mount tool sign-tool: $ENCLAVE_SIGN_TOOL"
    echo "Mount tool sign-key: $ENCLAVE_SIGN_KEY"
    [ -n "$SECURE_IMAGE_KEY" ] && echo "Image decryption key: $SECURE_IMAGE_KEY"
    echo "Mount point: $MNT_POINT"

    SGX_MODE=$(cat $instance_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        sefs_cli="$occlum_dir/build/bin/sefs-cli_sim"
        sefs_cli_lib="$occlum_dir/build/lib/libsefs-cli_sim.so"
        echo "SGX mode: $SGX_MODE"
    else
        sefs_cli="$occlum_dir/build/bin/sefs-cli"
        sefs_cli_lib="$occlum_dir/build/lib/libsefs-cli.so"
        echo "SGX mode: HW"
    fi

    signed_sefs_cli_lib="$instance_dir/build/lib/libsefs-cli.signed.so"
    echo "Signing the mount tool..."
    "$ENCLAVE_SIGN_TOOL" sign \
        -key "$ENCLAVE_SIGN_KEY" \
        -config "$occlum_dir/build/sefs-cli.Enclave.xml" \
        -enclave "$sefs_cli_lib" \
        -out "$signed_sefs_cli_lib"

    image_fs="$instance_dir/build/mount/__ROOT"
    if [ -e "$instance_dir/run/mount/__ROOT/metadata" ]; then
        container_fs="$instance_dir/run/mount/__ROOT"
    else
        container_fs=""
    fi

    [ -n "$SECURE_IMAGE_KEY" ] && SECURE_IMAGE_KEY_OPTION="--key $SECURE_IMAGE_KEY"
    echo "Start to mount the FS..."
    LD_LIBRARY_PATH="$SGX_SDK/sdk_libs" "$sefs_cli" \
        --enclave "$signed_sefs_cli_lib" \
        mount \
        $SECURE_IMAGE_KEY_OPTION \
        "$image_fs" \
        "$container_fs" \
        "$MNT_POINT"

    # After mounting the FS, remove the signed mount tool
    rm -f "$signed_sefs_cli_lib"
}

cmd_status() {
    cat "$status_file"
}

cmd_gen_image_key() {
    if [ -z $@ ]; then
        echo "Error: target file is not set"
        exit 1
    fi

    key_path="$@"
    if [[ "$key_path" != "/"* ]]; then
        key_path="$instance_dir/$@"
    fi
    cat /dev/urandom | tr -dc 'a-f0-9' | fold -w 32 | head -n 1 | sed -r 's/.{2}/&-/g; s/.$//' > $key_path
}

set -e

if [[ ( "$#" < 1 ) ]] ; then
    report_arg_error "Error: no sub-command is given"
    exit 1
fi

cmd=$1
case "$cmd" in
    new)
        cmd_new "${@:2:1}"
        ;;
    init)
        cmd_init
        ;;
    build)
        cmd_build "${@:2}"
        ;;
    run)
        cmd_run "${@:2}"
        ;;
    start)
        cmd_start
        ;;
    exec)
        cmd_exec "${@:2}"
        ;;
    stop)
        cmd_stop
        ;;
    package)
        cmd_package "${@:2}"
        ;;
    gdb)
        cmd_gdb "${@:2}"
        ;;
    mount)
        cmd_mount "${@:2}"
        ;;
    status)
        cmd_status
        ;;
    gen-image-key)
        cmd_gen_image_key "${@:2:1}"
        ;;
    *)
        report_arg_error "Error: unknown sub-command $cmd"
        exit 1
esac