#===----------------------------------------------------------------------===##
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===----------------------------------------------------------------------===##

#
# This Dockerfile describes the base image used to run the various libc++
# build bots. By default, the image runs the Buildkite Agent, however one
# can also just start the image with a shell to debug CI failures.
#
# To start a Buildkite Agent, run it as:
#   $ docker run --env-file secrets.env -it $(docker build -q .)
#
# The environment variables in `secrets.env` must be replaced by the actual
# tokens for this to work. These should obviously never be checked in.
#
# To start a shell in the Docker image, use:
#   $ docker run -it --volume "$(git rev-parse --show-toplevel):/llvm" --workdir "/llvm" $(docker build -q .) bash
#
# This will fire up the Docker container and mount the root of the monorepo
# as /llvm in the container. Be careful, the state in /llvm is shared between
# the container and the host machine.
#
# Finally, a pre-built version of this image is available on DockerHub as
# ldionne/libcxx-builder. To use the pre-built version of the image, use
#
#   $ docker pull ldionne/libcxx-builder
#   $ docker run -it <options> ldionne/libcxx-builder
#
# To update the image, rebuild it and push it to ldionne/libcxx-builder (which
# will obviously only work if you have permission to do so).
#
#   $ docker build -t ldionne/libcxx-builder .
#   $ docker push ldionne/libcxx-builder
#

FROM ubuntu:bionic

# Make sure apt-get doesn't try to prompt for stuff like our time zone, etc.
ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get install -y bash curl

# Install various tools used by the build or the test suite
RUN apt-get update && apt-get install -y ninja-build python3 python3-sphinx python3-distutils git gdb
RUN apt-get update && apt-get install -y libc6-dev-i386 # Required to cross-compile to 32 bits

# Install the most recently released LLVM
RUN apt-get update && apt-get install -y lsb-release wget software-properties-common
RUN wget https://apt.llvm.org/llvm.sh -O /tmp/llvm.sh
RUN bash /tmp/llvm.sh
RUN LLVM_VERSION=$(find /usr/bin -regex '^.+/clang-[0-9.]+$') && LLVM_VERSION=${LLVM_VERSION#*clang-} && echo "LLVM_VERSION=$LLVM_VERSION" > /tmp/env.sh
RUN ln -s $(find /usr/bin -regex '^.+/clang\+\+-[0-9.]+$') /usr/bin/clang++ && [ -e $(readlink /usr/bin/clang++) ]
RUN ln -s $(find /usr/bin -regex '^.+/clang-[0-9.]+$') /usr/bin/clang && [ -e $(readlink /usr/bin/clang) ]

# Install the not-yet-released LLVM
RUN . /tmp/env.sh && echo "LLVM_TOT_VERSION=$(($LLVM_VERSION + 1))" >> /tmp/env.sh
RUN . /tmp/env.sh && bash /tmp/llvm.sh ${LLVM_TOT_VERSION}
RUN . /tmp/env.sh && ln -s /usr/bin/clang++-${LLVM_TOT_VERSION} /usr/bin/clang++-tot && [ -e $(readlink /usr/bin/clang++-tot) ]
RUN . /tmp/env.sh && ln -s /usr/bin/clang-${LLVM_TOT_VERSION} /usr/bin/clang-tot && [ -e $(readlink /usr/bin/clang-tot) ]

# Install clang-format
RUN . /tmp/env.sh && apt-get install -y clang-format-$LLVM_VERSION
RUN ln -s $(find /usr/bin -regex '^.+/clang-format-[0-9.]+$') /usr/bin/clang-format && [ -e $(readlink /usr/bin/clang-format) ]
RUN ln -s $(find /usr/bin -regex '^.+/git-clang-format-[0-9.]+$') /usr/bin/git-clang-format && [ -e $(readlink /usr/bin/git-clang-format) ]

# Install a recent GCC
RUN add-apt-repository ppa:ubuntu-toolchain-r/test
RUN apt-get update && apt install -y gcc-10 g++-10
RUN ln -f -s /usr/bin/g++-10 /usr/bin/g++ && [ -e $(readlink /usr/bin/g++) ]
RUN ln -f -s /usr/bin/gcc-10 /usr/bin/gcc && [ -e $(readlink /usr/bin/gcc) ]

# Install a recent CMake
RUN wget https://github.com/Kitware/CMake/releases/download/v3.18.2/cmake-3.18.2-Linux-x86_64.sh -O /tmp/install-cmake.sh
RUN bash /tmp/install-cmake.sh --prefix=/usr --exclude-subdir --skip-license
RUN rm /tmp/install-cmake.sh

# Change the user to a non-root user, since some of the libc++ tests
# (e.g. filesystem) require running as non-root. Also setup passwordless sudo.
RUN apt-get update && apt-get install -y sudo
RUN echo "ALL ALL = (ALL) NOPASSWD: ALL" >> /etc/sudoers
RUN useradd --create-home libcxx-builder
USER libcxx-builder
WORKDIR /home/libcxx-builder

# Install the Buildkite agent and dependencies. This must be done as non-root
# for the Buildkite agent to be installed in a path where we can find it.
RUN bash -c "$(curl -sL https://raw.githubusercontent.com/buildkite/agent/master/install.sh)"
ENV PATH="${PATH}:/home/libcxx-builder/.buildkite-agent/bin"

# By default, start the Buildkite agent (this requires a token).
CMD buildkite-agent start --tags "queue=libcxx-builders"