Refactor OSDK and Asterinas Docker build systems

This commit is contained in:
Hsy-Intel 2025-04-30 22:14:32 +08:00 committed by Tate, Hongliang Tian
parent 149c00f5fc
commit a14d5a5017
11 changed files with 269 additions and 301 deletions

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**/Dockerfile

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# SPDX-License-Identifier: MPL-2.0
FROM ubuntu:22.04 AS build-base
ARG DEBIAN_FRONTEND=noninteractive
RUN apt update && apt-get install -y --no-install-recommends \
build-essential \
ca-certificates \
git \
python3-pip \
python-is-python3 \
wget
RUN pip3 install iq tomli
#= Build QEMU =================================================================
FROM build-base AS build-qemu
RUN apt update && apt-get install -y --no-install-recommends \
libgcrypt-dev `# optional build dependency` \
libglib2.0-dev `# build dependency` \
libpixman-1-dev `# build dependency` \
libusb-dev `# optional build dependency` \
meson \
ninja-build
RUN apt clean && rm -rf /var/lib/apt/lists/*
FROM build-qemu AS qemu
# Fetch and install QEMU from the official source
#
# The QEMU version in the Ubuntu 22.04 repository is 6.*, which has a bug to cause OVMF debug to fail.
# The libslirp dependency is for QEMU's network backend.
WORKDIR /root
RUN wget -O qemu.tar.xz https://download.qemu.org/qemu-9.1.0.tar.xz \
&& mkdir /root/qemu \
&& tar xf qemu.tar.xz --strip-components=1 -C /root/qemu \
&& rm qemu.tar.xz
WORKDIR /root/qemu
RUN ./configure --target-list=x86_64-softmmu --prefix=/usr/local/qemu --enable-slirp \
&& make -j \
&& make install
WORKDIR /root
RUN rm -rf /root/qemu
#= Build OVMF =================================================================
FROM build-base AS build-ovmf
RUN apt update && apt-get install -y --no-install-recommends \
bison \
flex \
iasl \
nasm \
uuid-dev
RUN apt clean && rm -rf /var/lib/apt/lists/*
RUN git --version
FROM build-ovmf AS ovmf
# Fetch and build OVMF from the EDK2 official source
WORKDIR /root
RUN git clone --depth 1 --branch stable/202408 --recurse-submodules --shallow-submodules https://github.com/tianocore/edk2.git
WORKDIR /root/edk2
RUN /bin/bash -c "source ./edksetup.sh \
&& make -C BaseTools \
&& build -a X64 -t GCC5 -b DEBUG -p OvmfPkg/OvmfPkgX64.dsc -D DEBUG_ON_SERIAL_PORT \
&& build -a X64 -t GCC5 -b RELEASE -p OvmfPkg/OvmfPkgX64.dsc"
#= Build GRUB =================================================================
FROM build-base AS build-grub
RUN apt update && apt-get install -y --no-install-recommends \
autoconf \
automake \
autopoint \
bison \
flex \
gawk \
gettext \
libfreetype6-dev \
pkg-config
RUN apt clean && rm -rf /var/lib/apt/lists/*
FROM build-grub AS grub
# Fetch and install GRUB from the GNU official source
#
# We have installed grub-efi-amd64-bin just for the unicode.pf2 file, which is not included
# in the GRUB release. The Ubuntu release notoriously modifies the GRUB source code and enforce
# EFI handover boot, which is deprecated. So we have to build GRUB from source.
WORKDIR /root
# See also: https://github.com/asterinas/asterinas/pull/1710
RUN git clone --single-branch -b asterinas/2.12 https://github.com/asterinas/grub.git \
&& git -C grub checkout 0633bc8
# Fetch and install the Unicode font data for grub.
RUN wget -O unifont.pcf.gz https://unifoundry.com/pub/unifont/unifont-15.1.04/font-builds/unifont-15.1.04.pcf.gz \
&& mkdir -pv /usr/share/fonts/unifont \
&& gunzip -c unifont.pcf.gz > /usr/share/fonts/unifont/unifont.pcf \
&& rm unifont.pcf.gz
WORKDIR /root/grub
RUN echo depends bli part_gpt > grub-core/extra_deps.lst \
&& ./bootstrap \
&& ./configure \
--target=x86_64 \
--disable-efiemu \
--with-platform=efi \
--enable-grub-mkfont \
--prefix=/usr/local/grub \
--disable-werror \
&& make -j \
&& make install
WORKDIR /root
RUN rm -rf /root/grub
#= The final stages to produce the OSDK development image ====================
FROM build-base AS rust
# Install all OSDK dependent packages
RUN apt update \
&& apt install -y \
build-essential \
curl \
gdb \
grub-efi-amd64 \
grub2-common \
libpixman-1-dev `# running dependency for QEMU` \
mtools `# used by grub-mkrescue` \
xorriso \
&& apt clean \
&& rm -rf /var/lib/apt/lists/*
# Install Rust with both nightly and stable
ENV PATH="/root/.cargo/bin:${PATH}"
ARG ASTER_RUST_VERSION
RUN curl https://sh.rustup.rs -sSf | \
sh -s -- --default-toolchain ${ASTER_RUST_VERSION} -y \
&& rustup toolchain install stable \
&& rm -rf /root/.cargo/registry && rm -rf /root/.cargo/git \
&& cargo -V \
&& rustup component add rust-src rustc-dev llvm-tools-preview
# Install cargo tools
RUN cargo install \
cargo-binutils \
mdbook \
typos-cli
# Install QEMU built from the previous stages
COPY --from=qemu /usr/local/qemu /usr/local/qemu
ENV PATH="/usr/local/qemu/bin:${PATH}"
ENV LD_LIBRARY_PATH="/usr/local/qemu/lib/x86_64-linux-gnu:${LD_LIBRARY_PATH}"
# Install OVMF built from the previous stages
COPY --from=ovmf /root/edk2/Build/OvmfX64/DEBUG_GCC5/FV/ /root/ovmf/debug
COPY --from=ovmf /root/edk2/Build/OvmfX64/RELEASE_GCC5/FV/ /root/ovmf/release
# Install GRUB built from the previous stages
COPY --from=grub /usr/local/grub /usr/local/grub
ENV PATH="/usr/local/grub/bin:${PATH}"
# Make a symbolic link for `unicode.pf2` from Ubuntu 22.04 package
RUN ln -sf /usr/share/grub/unicode.pf2 /usr/local/grub/share/grub/unicode.pf2
VOLUME [ "/root/asterinas" ]
WORKDIR /root/asterinas

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# SPDX-License-Identifier: MPL-2.0
FROM {% base_image %}
ARG DEBIAN_FRONTEND=noninteractive
RUN apt update \
&& apt install -y \
build-essential \
curl \
gdb \
grub-efi-amd64 \
grub2-common \
libpixman-1-dev `# running dependency for QEMU` \
mtools `# used by grub-mkrescue` \
xorriso \
{% qemu_ovmf_installation %} \
&& apt clean \
&& rm -rf /var/lib/apt/lists/*
# Install Rust of both nightly and stable channel
ENV PATH="/root/.cargo/bin:${PATH}"
ARG ASTER_RUST_VERSION
RUN curl https://sh.rustup.rs -sSf | \
sh -s -- --default-toolchain ${ASTER_RUST_VERSION} -y \
&& rustup toolchain install stable \
&& rm -rf /root/.cargo/registry && rm -rf /root/.cargo/git \
&& cargo -V \
&& rustup component add rust-src rustc-dev llvm-tools-preview
# Install cargo-binutils
RUN cargo install cargo-binutils
VOLUME [ "/root/asterinas" ]
WORKDIR /root/asterinas

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# OSDK Development Docker Images
The OSDK development Docker images provide the development environment for using and developing OSDK.
## Building Docker Images
To build an OSDK development Docker image and test it on your local machine, navigate to the root directory of the Asterinas source code tree and execute the following command:
```bash
cd <asterinas dir>
# Build Docker image
docker buildx build \
-f osdk/tools/docker/Dockerfile \
--build-arg ASTER_RUST_VERSION=$(grep "channel" rust-toolchain.toml | awk -F '"' '{print $2}') \
-t asterinas/osdk:$(cat DOCKER_IMAGE_VERSION) \
.
```
Intel TDX has some special requirements on the development environment such as QEMU.
So we offer a TDX-specific version of the OSDK development Docker image.
You need to build the general-purpose Docker image before building the TDX-specific one
as the former is used by the latter one as the base image.
```bash
cd <asterinas dir>
# Build Intel TDX Docker image
docker buildx build \
-f osdk/tools/docker/tdx/Dockerfile \
--build-arg ASTER_RUST_VERSION=$(grep "channel" rust-toolchain.toml | awk -F '"' '{print $2}') \
--build-arg BASE_VERSION=$(cat DOCKER_IMAGE_VERSION) \
-t asterinas/osdk:$(cat DOCKER_IMAGE_VERSION)-tdx \
.
```
## Tagging and Uploading Docker Images
The Docker images are tagged according to the version specified
in the `DOCKER_IMAGE_VERSION` file at the project root.
Check out the [version bump](https://asterinas.github.io/book/to-contribute/version-bump.html) documentation
on how new versions of the Docker images are released.

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#!/bin/bash
# SPDX-License-Identifier: MPL-2.0
set -e
SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
ASTER_ROOT_DIR=${SCRIPT_DIR}/../../..
ASTER_RUST_VERSION=$( grep -m1 -o 'nightly-[0-9]\+-[0-9]\+-[0-9]\+' ${ASTER_ROOT_DIR}/rust-toolchain.toml )
VERSION=$( cat ${ASTER_ROOT_DIR}/VERSION )
DOCKERFILE=${SCRIPT_DIR}/Dockerfile
if [ "$1" = "intel-tdx" ]; then
IMAGE_NAME="asterinas/osdk:${VERSION}-tdx"
python3 gen_dockerfile.py --intel-tdx
else
IMAGE_NAME="asterinas/osdk:${VERSION}"
python3 gen_dockerfile.py
fi
docker build \
-t ${IMAGE_NAME} \
--build-arg ASTER_RUST_VERSION=${ASTER_RUST_VERSION} \
-f ${DOCKERFILE} \
${SCRIPT_DIR}

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# SPDX-License-Identifier: MPL-2.0
import re
import argparse
import os
import sys
import logging
# Setup logging
logging.basicConfig(level=logging.INFO, format='%(levelname)s: %(message)s')
def parse_arguments():
parser = argparse.ArgumentParser(description='The Dockerfile generator for OSDK.')
parser.add_argument('--intel-tdx', action='store_true', help='Include Intel TDX support')
parser.add_argument(
'--out-dir',
type=str,
default='.',
help='Output the Dockerfile under this directory. \
By default, the output directory is the current working directory.'
)
return parser.parse_args()
def validate_out_dir(out_dir):
if os.path.isabs(out_dir):
print("Error: The --out-dir argument must be a relative path.")
sys.exit(1)
def setup_output_directory(out_dir):
template_dir = os.path.dirname(os.path.abspath(__file__))
if out_dir == '.':
return template_dir
output_directory_path = os.path.join(template_dir, out_dir)
if not os.path.exists(output_directory_path):
os.makedirs(output_directory_path)
return output_directory_path
def load_template(template_dir):
template_file = os.path.join(template_dir, 'Dockerfile.template')
if not os.path.isfile(template_file):
logging.error(f"Template file {template_file} does not exist.")
sys.exit(1)
with open(template_file, 'r') as file:
return file.read()
def generate_dockerfile_content(variables, template_content):
for var_name, var_value in variables.items():
template_content = re.sub(r'{%\s*' + var_name + r'\s*%}', var_value, template_content)
return template_content
def write_dockerfile(output_directory, content):
output_path = os.path.join(output_directory, 'Dockerfile')
with open(output_path, 'w') as file:
file.write(content)
logging.info(f'Dockerfile has been generated at {output_path}.')
def main():
args = parse_arguments()
validate_out_dir(args.out_dir)
variables = {
'base_image': r'ubuntu:22.04',
'qemu_ovmf_installation': r"""ovmf \
qemu-system-x86""",
}
if args.intel_tdx:
variables['base_image'] = r'intelcczoo/tdvm:ubuntu22.04-mvp_2023ww15'
variables['qemu_ovmf_installation'] = r''
template_dir = os.path.dirname(os.path.abspath(__file__))
output_directory = setup_output_directory(args.out_dir)
template_content = load_template(template_dir)
dockerfile_content = generate_dockerfile_content(variables, template_content)
write_dockerfile(output_directory, dockerfile_content)
if __name__ == '__main__':
main()

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# SPDX-License-Identifier: MPL-2.0
ARG BASE_VERSION
FROM asterinas/osdk:${BASE_VERSION} AS build-base
# Fetch and install QEMU from the intel-staging/qemu-tdx source
FROM build-base AS build-qemu-tdx
RUN apt update && apt-get install -y --no-install-recommends \
libgcrypt-dev `# optional build dependency` \
libglib2.0-dev `# build dependency` \
libpixman-1-dev `# build dependency` \
libusb-dev `# optional build dependency` \
meson \
ninja-build
RUN apt clean && rm -rf /var/lib/apt/lists/*
FROM build-qemu-tdx AS qemu-tdx
WORKDIR /root
RUN git clone -b tdx-qemu-upstream-2024.02.29-v8.2.0 https://github.com/intel-staging/qemu-tdx.git
WORKDIR /root/qemu-tdx
COPY osdk/tools/docker/tdx/tdx_qemu.patch /root/qemu-tdx
RUN git apply tdx_qemu.patch \
&& mkdir build \
&& cd build \
&& ../configure --enable-kvm --target-list=x86_64-softmmu --prefix=/usr/local/qemu --enable-slirp \
&& make -j \
&& make install
WORKDIR /root
RUN rm -rf /root/qemu-tdx
FROM build-base
# Install QEMU built from the previous stages
COPY --from=qemu-tdx /usr/local/qemu /usr/local/qemu
WORKDIR /root/asterinas

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@ -1,34 +1,28 @@
# SPDX-License-Identifier: MPL-2.0
#= Install packages for Docker building ====================================
FROM ubuntu:22.04 AS build-base
ARG BASE_VERSION
FROM asterinas/osdk:${BASE_VERSION} AS build-base
SHELL ["/bin/bash", "-c"]
ARG DEBIAN_FRONTEND=noninteractive
#= Install packages for Docker building ====================================
# Please keep the list sorted by name
RUN apt update && apt-get install -y --no-install-recommends \
apache2-utils \
build-essential \
ca-certificates \
clang \
cmake \
curl \
git-core \
gnupg \
libevent-dev \
libslirp-dev \
libssl-dev \
jq \
python3-pip \
python-is-python3 \
tcl-dev \
unzip \
wget \
zip
RUN pip3 install yq tomli
#= Download dependency =====================================================
@ -297,107 +291,6 @@ WORKDIR /root/syscall_test
RUN export BUILD_DIR=build && \
make ${BUILD_DIR}/syscall_test_bins
#= Build QEMU =================================================================
FROM build-base AS build-qemu
RUN apt update && apt-get install -y --no-install-recommends \
libgcrypt-dev `# optional build dependency` \
libglib2.0-dev `# build dependency` \
libpixman-1-dev `# build dependency` \
libusb-dev `# optional build dependency` \
meson \
ninja-build
RUN apt clean && rm -rf /var/lib/apt/lists/*
FROM build-qemu AS qemu
# Fetch and install QEMU from the official source
#
# The QEMU version in the Ubuntu 22.04 repository is 6.*, which has a bug to cause OVMF debug to fail.
# The libslirp dependency is for QEMU's network backend.
WORKDIR /root
RUN wget -O qemu.tar.xz https://download.qemu.org/qemu-9.1.0.tar.xz \
&& mkdir /root/qemu \
&& tar xf qemu.tar.xz --strip-components=1 -C /root/qemu \
&& rm qemu.tar.xz
WORKDIR /root/qemu
RUN ./configure --target-list=x86_64-softmmu --prefix=/usr/local/qemu --enable-slirp \
&& make -j \
&& make install
WORKDIR /root
RUN rm -rf /root/qemu
#= Build OVMF =================================================================
FROM build-base AS build-ovmf
RUN apt update && apt-get install -y --no-install-recommends \
bison \
flex \
iasl \
nasm \
uuid-dev
RUN apt clean && rm -rf /var/lib/apt/lists/*
FROM build-ovmf AS ovmf
# Fetch and build OVMF from the EDK2 official source
WORKDIR /root
RUN git clone --depth 1 --branch stable/202408 --recurse-submodules --shallow-submodules https://github.com/tianocore/edk2.git
WORKDIR /root/edk2
RUN /bin/bash -c "source ./edksetup.sh \
&& make -C BaseTools \
&& build -a X64 -t GCC5 -b DEBUG -p OvmfPkg/OvmfPkgX64.dsc -D DEBUG_ON_SERIAL_PORT \
&& build -a X64 -t GCC5 -b RELEASE -p OvmfPkg/OvmfPkgX64.dsc"
#= Build GRUB =================================================================
FROM build-base AS build-grub
RUN apt update && apt-get install -y --no-install-recommends \
autoconf \
automake \
autopoint \
bison \
flex \
gawk \
gettext \
libfreetype6-dev \
pkg-config
RUN apt clean && rm -rf /var/lib/apt/lists/*
FROM build-grub AS grub
# Fetch and install GRUB from the GNU official source
#
# We have installed grub-efi-amd64-bin just for the unicode.pf2 file, which is not included
# in the GRUB release. The Ubuntu release notoriously modifies the GRUB source code and enforce
# EFI handover boot, which is deprecated. So we have to build GRUB from source.
WORKDIR /root
# See also: https://github.com/asterinas/asterinas/pull/1710
RUN git clone --single-branch -b asterinas/2.12 https://github.com/asterinas/grub.git \
&& git -C grub checkout 0633bc8
# Fetch and install the Unicode font data for grub.
RUN wget -O unifont.pcf.gz https://unifoundry.com/pub/unifont/unifont-15.1.04/font-builds/unifont-15.1.04.pcf.gz \
&& mkdir -pv /usr/share/fonts/unifont \
&& gunzip -c unifont.pcf.gz > /usr/share/fonts/unifont/unifont.pcf \
&& rm unifont.pcf.gz
WORKDIR /root/grub
RUN echo depends bli part_gpt > grub-core/extra_deps.lst \
&& ./bootstrap \
&& ./configure \
--target=x86_64 \
--disable-efiemu \
--with-platform=efi \
--enable-grub-mkfont \
--prefix=/usr/local/grub \
--disable-werror \
&& make -j \
&& make install
WORKDIR /root
RUN rm -rf /root/grub
#= Build busybox ==============================================================
FROM build-base AS build-busybox
@ -419,25 +312,7 @@ RUN make defconfig \
#= The final stages to produce the Asterinas development image ====================
FROM build-base AS rust
# Install Rust with both nightly and stable
ENV PATH="/root/.cargo/bin:${PATH}"
ARG ASTER_RUST_VERSION
RUN curl https://sh.rustup.rs -sSf | \
sh -s -- --default-toolchain ${ASTER_RUST_VERSION} -y \
&& rustup toolchain install stable \
&& rm -rf /root/.cargo/registry && rm -rf /root/.cargo/git \
&& cargo -V \
&& rustup component add rust-src rustc-dev llvm-tools-preview
# Install cargo tools
RUN cargo install \
cargo-binutils \
mdbook \
typos-cli
FROM rust
FROM build-base
# Install all Asterinas dependent packages
RUN apt update && apt-get install -y --no-install-recommends \
@ -447,16 +322,12 @@ RUN apt update && apt-get install -y --no-install-recommends \
cpuid \
exfatprogs \
file \
gdb \
grub-efi-amd64 \
grub-efi-amd64-bin \
grub-efi-amd64-dbg \
iptables \
iproute2 \
libnl-3-dev `# dependency for netlink socket` \
libnl-route-3-dev `# dependency for netlink route socket` \
libpixman-1-dev `# running dependency for QEMU` \
mtools `# used by grub-mkrescue` \
net-tools \
openssh-server \
pkg-config \
@ -465,7 +336,6 @@ RUN apt update && apt-get install -y --no-install-recommends \
sudo \
unzip \
vim \
xorriso \
zip
# Clean apt cache
RUN apt clean && rm -rf /var/lib/apt/lists/*
@ -474,21 +344,6 @@ RUN apt clean && rm -rf /var/lib/apt/lists/*
COPY --from=syscall_test /root/syscall_test/build/syscall_test_bins /root/syscall_test_bins
ENV ASTER_PREBUILT_SYSCALL_TEST=/root/syscall_test_bins
# Install QEMU built from the previous stages
COPY --from=qemu /usr/local/qemu /usr/local/qemu
ENV PATH="/usr/local/qemu/bin:${PATH}"
ENV LD_LIBRARY_PATH="/usr/local/qemu/lib/x86_64-linux-gnu:${LD_LIBRARY_PATH}"
# Install OVMF built from the previous stages
COPY --from=ovmf /root/edk2/Build/OvmfX64/DEBUG_GCC5/FV/ /root/ovmf/debug
COPY --from=ovmf /root/edk2/Build/OvmfX64/RELEASE_GCC5/FV/ /root/ovmf/release
# Install GRUB built from the previous stages
COPY --from=grub /usr/local/grub /usr/local/grub
ENV PATH="/usr/local/grub/bin:${PATH}"
# Make a symbolic link for `unicode.pf2` from Ubuntu 22.04 package
RUN ln -sf /usr/share/grub/unicode.pf2 /usr/local/grub/share/grub/unicode.pf2
# Install Busybox built from the previous stages
COPY --from=busybox /root/busybox/busybox /bin/busybox

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@ -4,7 +4,7 @@ Asterinas development Docker images are provided to facilitate developing and te
## Building Docker Images
To build a Docker image for Asterinas and test it on your local machine, navigate to the root directory of the Asterinas source code tree and execute the following command:
Asterinas development Docker image is based on an OSDK development Docker image. To build an Asterinas development Docker image and test it on your local machine, navigate to the root directory of the Asterinas source code tree and execute the following command:
```bash
cd <asterinas dir>
@ -12,11 +12,15 @@ cd <asterinas dir>
docker buildx build \
-f tools/docker/Dockerfile \
--build-arg ASTER_RUST_VERSION=$(grep "channel" rust-toolchain.toml | awk -F '"' '{print $2}') \
-t asterinas/asterinas:$(cat VERSION)-$(date +%Y%m%d) \
--build-arg BASE_VERSION=$(cat DOCKER_IMAGE_VERSION) \
-t asterinas/asterinas:$(cat DOCKER_IMAGE_VERSION) \
.
```
For the Intel TDX Docker image, it is based on a general Docker image. You can execute the following command:
Intel TDX has some special requirements on the development environment such as QEMU.
So we offer a TDX-specific version of the Asterinas development Docker image.
You need to build the general-purpose Docker image before building the TDX-specific one
as the former is used by the latter one as the base image.
```bash
cd <asterinas dir>
@ -24,15 +28,14 @@ cd <asterinas dir>
docker buildx build \
-f tools/docker/tdx/Dockerfile \
--build-arg ASTER_RUST_VERSION=$(grep "channel" rust-toolchain.toml | awk -F '"' '{print $2}') \
--build-arg BASE_VERSION=${BASE_VERSION} \
-t asterinas/asterinas:$(cat VERSION)-$(date +%Y%m%d)-tdx \
--build-arg BASE_VERSION=$(cat DOCKER_IMAGE_VERSION) \
-t asterinas/asterinas:$(cat DOCKER_IMAGE_VERSION)-tdx \
.
```
Where `BASE_VERSION` represents the general Docker image you want to base it on.
## Tagging and Uploading Docker Images
Regarding the tagging Docker images, please refer to this [link](https://asterinas.github.io/book/to-contribute/version-bump.html).
New versions of Asterinas's Docker images are automatically uploaded to DockerHub through Github Actions. Simply submit your PR that updates Asterinas's Docker image for review. After getting the project maintainers' approval, the [Docker image building workflow](../../.github/workflows/publish_docker_images.yml) will be started, building the new Docker image and pushing it to DockerHub.
The Docker images are tagged according to the version specified
in the `DOCKER_IMAGE_VERSION` file at the project root.
Check out the [version bump](https://asterinas.github.io/book/to-contribute/version-bump.html) documentation
on how new versions of the Docker images are released.

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@ -20,7 +20,7 @@ FROM build-qemu-tdx AS qemu-tdx
WORKDIR /root
RUN git clone -b tdx-qemu-upstream-2024.02.29-v8.2.0 https://github.com/intel-staging/qemu-tdx.git
WORKDIR /root/qemu-tdx
COPY tools/docker/tdx/tdx_qemu.patch /root/qemu-tdx
COPY osdk/tools/docker/tdx/tdx_qemu.patch /root/qemu-tdx
RUN git apply tdx_qemu.patch \
&& mkdir build \
&& cd build \