# linux.py - Linux specific automation functionality

#

# Copyright 2019 Gregory Szorc <gregory.szorc@gmail.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

# no-check-code because Python 3 native.

import os

import pathlib

import shlex

import subprocess

import tempfile

from .ssh import (

    exec_command,

)

# Linux distributions that are supported.

DISTROS = {

    'debian9',

    'ubuntu18.04',

    'ubuntu18.10',

    'ubuntu19.04',

}

INSTALL_PYTHONS = r'''

PYENV2_VERSIONS="2.7.16 pypy2.7-7.1.1"

PYENV3_VERSIONS="3.5.7 3.6.9 3.7.4 3.8-dev pypy3.5-7.0.0 pypy3.6-7.1.1"

git clone https://github.com/pyenv/pyenv.git /hgdev/pyenv

pushd /hgdev/pyenv

git checkout 17f44b7cd6f58ea2fa68ec0371fb9e7a826b8be2

popd

export PYENV_ROOT="/hgdev/pyenv"

export PATH="$PYENV_ROOT/bin:$PATH"

# pip 19.0.3.

PIP_SHA256=efe99298f3fbb1f56201ce6b81d2658067d2f7d7dfc2d412e0d3cacc9a397c61

wget -O get-pip.py --progress dot:mega https://github.com/pypa/get-pip/raw/fee32c376da1ff6496a798986d7939cd51e1644f/get-pip.py

echo "${PIP_SHA256} get-pip.py" | sha256sum --check -

VIRTUALENV_SHA256=984d7e607b0a5d1329425dd8845bd971b957424b5ba664729fab51ab8c11bc39

VIRTUALENV_TARBALL=virtualenv-16.4.3.tar.gz

wget -O ${VIRTUALENV_TARBALL} --progress dot:mega https://files.pythonhosted.org/packages/37/db/89d6b043b22052109da35416abc3c397655e4bd3cff031446ba02b9654fa/${VIRTUALENV_TARBALL}

echo "${VIRTUALENV_SHA256} ${VIRTUALENV_TARBALL}" | sha256sum --check -

for v in ${PYENV2_VERSIONS}; do

    pyenv install -v ${v}

    ${PYENV_ROOT}/versions/${v}/bin/python get-pip.py

    ${PYENV_ROOT}/versions/${v}/bin/pip install ${VIRTUALENV_TARBALL}

    ${PYENV_ROOT}/versions/${v}/bin/pip install -r /hgdev/requirements-py2.txt

done

for v in ${PYENV3_VERSIONS}; do

    pyenv install -v ${v}

    ${PYENV_ROOT}/versions/${v}/bin/python get-pip.py

    ${PYENV_ROOT}/versions/${v}/bin/pip install -r /hgdev/requirements-py3.txt

done

pyenv global ${PYENV2_VERSIONS} ${PYENV3_VERSIONS} system

'''.lstrip().replace('\r\n', '\n')

BOOTSTRAP_VIRTUALENV = r'''

/usr/bin/virtualenv /hgdev/venv-bootstrap

HG_SHA256=1bdd21bb87d1e05fb5cd395d488d0e0cc2f2f90ce0fd248e31a03595da5ccb47

HG_TARBALL=mercurial-4.9.1.tar.gz

wget -O ${HG_TARBALL} --progress dot:mega https://www.mercurial-scm.org/release/${HG_TARBALL}

echo "${HG_SHA256} ${HG_TARBALL}" | sha256sum --check -

/hgdev/venv-bootstrap/bin/pip install ${HG_TARBALL}

'''.lstrip().replace('\r\n', '\n')

BOOTSTRAP_DEBIAN = r'''

#!/bin/bash

set -ex

DISTRO=`grep DISTRIB_ID /etc/lsb-release  | awk -F= '{{print $2}}'`

DEBIAN_VERSION=`cat /etc/debian_version`

LSB_RELEASE=`lsb_release -cs`

sudo /usr/sbin/groupadd hg

sudo /usr/sbin/groupadd docker

sudo /usr/sbin/useradd -g hg -G sudo,docker -d /home/hg -m -s /bin/bash hg

sudo mkdir /home/hg/.ssh

sudo cp ~/.ssh/authorized_keys /home/hg/.ssh/authorized_keys

sudo chown -R hg:hg /home/hg/.ssh

sudo chmod 700 /home/hg/.ssh

sudo chmod 600 /home/hg/.ssh/authorized_keys

cat << EOF | sudo tee /etc/sudoers.d/90-hg

hg ALL=(ALL) NOPASSWD:ALL

EOF

sudo apt-get update

sudo DEBIAN_FRONTEND=noninteractive apt-get -yq dist-upgrade

# Install packages necessary to set up Docker Apt repo.

sudo DEBIAN_FRONTEND=noninteractive apt-get -yq install --no-install-recommends \

    apt-transport-https \

    gnupg

cat > docker-apt-key << EOF

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ku4bIQN1X5P07fNWzlgaRL5Z4POXDDZTlIQ/El58j9kp4bnWRCJW0lya+f8ocodo

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G7c0tIkVEKNUq48b3aQ64NOZQW7fVjfoKwEZdOqPE72Pa45jrZzvUFxSpdiNk2tZ

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KA9v+yY2/l45L8d/WUkUi0YXomn6hyBGI7JrBLq0CX37GEYP6O9rrKipfz73XfO7

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9AcZ58Em+1WsVnAXdUR//bMmhyr8wL/G1YO1V3JEJTRdxsSxdYa4deGBBY/Adpsw

24jxhOJR+lsJpqIUeb999+R8euDhRHG9eFO7DRu6weatUJ6suupoDTRWtr/4yGqe

dKxV3qQhNLSnaAzqW/1nA3iUB4k7kCaKZxhdhDbClf9P37qaRW467BLCVO/coL3y

Vm50dwdrNtKpMBh3ZpbB1uJvgi9mXtyBOMJ3v8RZeDzFiG8HdCtg9RvIt/AIFoHR

H3S+U79NT6i0KPzLImDfs8T7RlpyuMc4Ufs8ggyg9v3Ae6cN3eQyxcK3w0cbBwsh

/nQNfsA6uu+9H7NhbehBMhYnpNZyrHzCmzyXkauwRAqoCbGCNykTRwsur9gS41TQ

M8ssD1jFheOJf3hODnkKU+HKjvMROl1DK7zdmLdNzA1cvtZH/nCC9KPj1z8QC47S

xx+dTZSx4ONAhwbS/LN3PoKtn8LPjY9NP9uDWI+TWYquS2U+KHDrBDlsgozDbs/O

jCxcpDzNmXpWQHEtHU7649OXHP7UeNST1mCUCH5qdank0V1iejF6/CfTFU4MfcrG

YT90qFF93M3v01BbxP+EIY2/9tiIPbrd

=0YYh

-----END PGP PUBLIC KEY BLOCK-----

EOF

sudo apt-key add docker-apt-key

if [ "$DEBIAN_VERSION" = "9.8" ]; then

cat << EOF | sudo tee -a /etc/apt/sources.list

# Need backports for clang-format-6.0

deb http://deb.debian.org/debian stretch-backports main

# Sources are useful if we want to compile things locally.

deb-src http://deb.debian.org/debian stretch main

deb-src http://security.debian.org/debian-security stretch/updates main

deb-src http://deb.debian.org/debian stretch-updates main

deb-src http://deb.debian.org/debian stretch-backports main

deb [arch=amd64] https://download.docker.com/linux/debian stretch stable

EOF

elif [ "$DISTRO" = "Ubuntu" ]; then

cat << EOF | sudo tee -a /etc/apt/sources.list

deb [arch=amd64] https://download.docker.com/linux/ubuntu $LSB_RELEASE stable

EOF

fi

sudo apt-get update

PACKAGES="\

    btrfs-progs \

    build-essential \

    bzr \

    clang-format-6.0 \

    cvs \

    darcs \

    debhelper \

    devscripts \

    dpkg-dev \

    dstat \

    emacs \

    gettext \

    git \

    htop \

    iotop \

    jfsutils \

    libbz2-dev \

    libexpat1-dev \

    libffi-dev \

    libgdbm-dev \

    liblzma-dev \

    libncurses5-dev \

    libnss3-dev \

    libreadline-dev \

    libsqlite3-dev \

    libssl-dev \

    netbase \

    ntfs-3g \

    nvme-cli \

    pyflakes \

    pyflakes3 \

    pylint \

    pylint3 \

    python-all-dev \

    python-dev \

    python-docutils \

    python-fuzzywuzzy \

    python-pygments \

    python-subversion \

    python-vcr \

    python3-dev \

    python3-docutils \

    python3-fuzzywuzzy \

    python3-pygments \

    python3-vcr \

    rsync \

    sqlite3 \

    subversion \

    tcl-dev \

    tk-dev \

    tla \

    unzip \

    uuid-dev \

    vim \

    virtualenv \

    wget \

    xfsprogs \

    zip \

    zlib1g-dev"

if [ "$DEBIAN_VERSION" = "9.8" ]; then

    PACKAGES="$PACKAGES linux-perf"

elif [ "$DISTRO" = "Ubuntu" ]; then

    PACKAGES="$PACKAGES linux-tools-common"

fi

# Ubuntu 19.04 removes monotone.

if [ "$LSB_RELEASE" != "disco" ]; then

    PACKAGES="$PACKAGES monotone"

fi

# As of April 27, 2019, Docker hasn't published packages for

# Ubuntu 19.04 yet.

if [ "$LSB_RELEASE" != "disco" ]; then

    PACKAGES="$PACKAGES docker-ce"

fi

sudo DEBIAN_FRONTEND=noninteractive apt-get -yq install --no-install-recommends $PACKAGES

# Create clang-format symlink so test harness finds it.

sudo update-alternatives --install /usr/bin/clang-format clang-format \

    /usr/bin/clang-format-6.0 1000

sudo mkdir /hgdev

# Will be normalized to hg:hg later.

sudo chown `whoami` /hgdev

cp requirements-py2.txt /hgdev/requirements-py2.txt

cp requirements-py3.txt /hgdev/requirements-py3.txt

# Disable the pip version check because it uses the network and can

# be annoying.

cat << EOF | sudo tee -a /etc/pip.conf

[global]

disable-pip-version-check = True

EOF

{install_pythons}

{bootstrap_virtualenv}

/hgdev/venv-bootstrap/bin/hg clone https://www.mercurial-scm.org/repo/hg /hgdev/src

# Mark the repo as non-publishing.

cat >> /hgdev/src/.hg/hgrc << EOF

[phases]

publish = false

EOF

sudo chown -R hg:hg /hgdev

'''.lstrip().format(

    install_pythons=INSTALL_PYTHONS,

    bootstrap_virtualenv=BOOTSTRAP_VIRTUALENV

).replace('\r\n', '\n')

# Prepares /hgdev for operations.

PREPARE_HGDEV = '''

#!/bin/bash

set -e

FS=$1

ensure_device() {

    if [ -z "${DEVICE}" ]; then

        echo "could not find block device to format"

        exit 1

    fi

}

# Determine device to partition for extra filesystem.

# If only 1 volume is present, it will be the root volume and

# should be /dev/nvme0. If multiple volumes are present, the

# root volume could be nvme0 or nvme1. Use whichever one doesn't have

# a partition.

if [ -e /dev/nvme1n1 ]; then

    if [ -e /dev/nvme0n1p1 ]; then

        DEVICE=/dev/nvme1n1

    else

        DEVICE=/dev/nvme0n1

    fi

else

    DEVICE=

fi

sudo mkdir /hgwork

if [ "${FS}" != "default" -a "${FS}" != "tmpfs" ]; then

    ensure_device

    echo "creating ${FS} filesystem on ${DEVICE}"

fi

if [ "${FS}" = "default" ]; then

    :

elif [ "${FS}" = "btrfs" ]; then

    sudo mkfs.btrfs ${DEVICE}

    sudo mount ${DEVICE} /hgwork

elif [ "${FS}" = "ext3" ]; then

    # lazy_journal_init speeds up filesystem creation at the expense of

    # integrity if things crash. We are an ephemeral instance, so we don't

    # care about integrity.

    sudo mkfs.ext3 -E lazy_journal_init=1 ${DEVICE}

    sudo mount ${DEVICE} /hgwork

elif [ "${FS}" = "ext4" ]; then

    sudo mkfs.ext4 -E lazy_journal_init=1 ${DEVICE}

    sudo mount ${DEVICE} /hgwork

elif [ "${FS}" = "jfs" ]; then

    sudo mkfs.jfs ${DEVICE}

    sudo mount ${DEVICE} /hgwork

elif [ "${FS}" = "tmpfs" ]; then

    echo "creating tmpfs volume in /hgwork"

    sudo mount -t tmpfs -o size=1024M tmpfs /hgwork

elif [ "${FS}" = "xfs" ]; then

    sudo mkfs.xfs ${DEVICE}

    sudo mount ${DEVICE} /hgwork

else

    echo "unsupported filesystem: ${FS}"

    exit 1

fi

echo "/hgwork ready"

sudo chown hg:hg /hgwork

mkdir /hgwork/tmp

chown hg:hg /hgwork/tmp

rsync -a /hgdev/src /hgwork/

'''.lstrip().replace('\r\n', '\n')

HG_UPDATE_CLEAN = '''

set -ex

HG=/hgdev/venv-bootstrap/bin/hg

cd /hgwork/src

${HG} --config extensions.purge= purge --all

${HG} update -C $1

${HG} log -r .

'''.lstrip().replace('\r\n', '\n')

def prepare_exec_environment(ssh_client, filesystem='default'):

    """Prepare an EC2 instance to execute things.

    The AMI has an ``/hgdev`` bootstrapped with various Python installs

    and a clone of the Mercurial repo.

    In EC2, EBS volumes launched from snapshots have wonky performance behavior.

    Notably, blocks have to be copied on first access, which makes volume

    I/O extremely slow on fresh volumes.

    Furthermore, we may want to run operations, tests, etc on alternative

    filesystems so we examine behavior on different filesystems.

    This function is used to facilitate executing operations on alternate

    volumes.

    """

    sftp = ssh_client.open_sftp()

    with sftp.open('/hgdev/prepare-hgdev', 'wb') as fh:

        fh.write(PREPARE_HGDEV)

        fh.chmod(0o0777)

    command = 'sudo /hgdev/prepare-hgdev %s' % filesystem

    chan, stdin, stdout = exec_command(ssh_client, command)

    stdin.close()

    for line in stdout:

        print(line, end='')

    res = chan.recv_exit_status()

    if res:

        raise Exception('non-0 exit code updating working directory; %d'

                        % res)

def synchronize_hg(source_path: pathlib.Path, ec2_instance, revision: str=None):

    """Synchronize a local Mercurial source path to remote EC2 instance."""

    with tempfile.TemporaryDirectory() as temp_dir:

        temp_dir = pathlib.Path(temp_dir)

        ssh_dir = temp_dir / '.ssh'

        ssh_dir.mkdir()

        ssh_dir.chmod(0o0700)

        public_ip = ec2_instance.public_ip_address

        ssh_config = ssh_dir / 'config'

        with ssh_config.open('w', encoding='utf-8') as fh:

            fh.write('Host %s\n' % public_ip)

            fh.write('  User hg\n')

            fh.write('  StrictHostKeyChecking no\n')

            fh.write('  UserKnownHostsFile %s\n' % (ssh_dir / 'known_hosts'))

            fh.write('  IdentityFile %s\n' % ec2_instance.ssh_private_key_path)

        if not (source_path / '.hg').is_dir():

            raise Exception('%s is not a Mercurial repository; synchronization '

                            'not yet supported' % source_path)

        env = dict(os.environ)

        env['HGPLAIN'] = '1'

        env['HGENCODING'] = 'utf-8'

        hg_bin = source_path / 'hg'

        res = subprocess.run(

            ['python2.7', str(hg_bin), 'log', '-r', revision, '-T', '{node}'],

            cwd=str(source_path), env=env, check=True, capture_output=True)

        full_revision = res.stdout.decode('ascii')

        args = [

            'python2.7', str(hg_bin),

            '--config', 'ui.ssh=ssh -F %s' % ssh_config,

            '--config', 'ui.remotecmd=/hgdev/venv-bootstrap/bin/hg',

            # Also ensure .hgtags changes are present so auto version

            # calculation works.

            'push', '-f', '-r', full_revision, '-r', 'file(.hgtags)',

            'ssh://%s//hgwork/src' % public_ip,

        ]

        res = subprocess.run(args, cwd=str(source_path), env=env)

        # Allow 1 (no-op) to not trigger error.

        if res.returncode not in (0, 1):

            res.check_returncode()

        # TODO support synchronizing dirty working directory.

        sftp = ec2_instance.ssh_client.open_sftp()

        with sftp.open('/hgdev/hgup', 'wb') as fh:

            fh.write(HG_UPDATE_CLEAN)

            fh.chmod(0o0700)

        chan, stdin, stdout = exec_command(

            ec2_instance.ssh_client, '/hgdev/hgup %s' % full_revision)

        stdin.close()