view contrib/automation/hgautomation/windows.py @ 42024:b05a3e28cf24

automation: perform tasks on remote machines

Sometimes you don't have access to a machine in order to
do something. For example, you may not have access to a Windows
machine required to build Windows binaries or run tests on that
platform.

This commit introduces a pile of code intended to help
"automate" common tasks, like building release artifacts.

In its current form, the automation code provides functionality
for performing tasks on Windows EC2 instances.

The hgautomation.aws module provides functionality for integrating
with AWS. It manages EC2 resources such as IAM roles, EC2
security groups, AMIs, and instances.

The hgautomation.windows module provides a higher-level
interface for performing tasks on remote Windows machines.

The hgautomation.cli module provides a command-line interface to
these higher-level primitives.

I attempted to structure Windows remote machine interaction
around Windows Remoting / PowerShell. This is kinda/sorta like
SSH + shell, but for Windows. In theory, most of the functionality
is cloud provider agnostic, as we should be able to use any
established WinRM connection to interact with a remote. In
reality, we're tightly coupled to AWS at the moment because
I didn't want to prematurely add abstractions for a 2nd cloud
provider. (1 was hard enough to implement.)

In the aws module is code for creating an image with a fully
functional Mercurial development environment. It contains VC9,
VC2017, msys, and other dependencies. The image is fully capable
of building all the existing Mercurial release artifacts and
running tests.

There are a few things that don't work. For example, running
Windows tests with Python 3. But building the Windows release
artifacts does work. And that was an impetus for this work.
(Although we don't yet support code signing.)

Getting this functionality to work was extremely time consuming.
It took hours debugging permissions failures and other wonky
behavior due to PowerShell Remoting. (The permissions model for
PowerShell is crazy and you brush up against all kinds of
issues because of the user/privileges of the user running
the PowerShell and the permissions of the PowerShell session
itself.)

The functionality around AWS resource management could use some
improving. In theory we support shared tenancy via resource
name prefixing. In reality, we don't offer a way to configure
this.

Speaking of AWS resource management, I thought about using a tool
like Terraform to manage resources. But at our scale, writing a
few dozen lines of code to manage resources seemed acceptable.
Maybe we should reconsider this if things grow out of control.
Time will tell.

Currently, emphasis is placed on Windows. But I only started
there because it was likely to be the most difficult to implement.
It should be relatively trivial to automate tasks on remote Linux
machines. In fact, I have a ~1 year old script to run tests on a
remote EC2 instance. I will likely be porting that to this new
"framework" in the near future.

# no-check-commit because foo_bar functions

Differential Revision: https://phab.mercurial-scm.org/D6142

# windows.py - Automation specific to Windows
#
# Copyright 2019 Gregory Szorc <[e-mail]>
#
# 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 re
import subprocess
import tempfile

from .winrm import (
    run_powershell,
)


# PowerShell commands to activate a Visual Studio 2008 environment.
# This is essentially a port of vcvarsall.bat to PowerShell.
ACTIVATE_VC9_AMD64 = r'''
Write-Output "activating Visual Studio 2008 environment for AMD64"
$root = "$env:LOCALAPPDATA\Programs\Common\Microsoft\Visual C++ for Python\9.0"
$Env:VCINSTALLDIR = "${root}\VC\"
$Env:WindowsSdkDir = "${root}\WinSDK\"
$Env:PATH = "${root}\VC\Bin\amd64;${root}\WinSDK\Bin\x64;${root}\WinSDK\Bin;$Env:PATH"
$Env:INCLUDE = "${root}\VC\Include;${root}\WinSDK\Include;$Env:PATH"
$Env:LIB = "${root}\VC\Lib\amd64;${root}\WinSDK\Lib\x64;$Env:LIB"
$Env:LIBPATH = "${root}\VC\Lib\amd64;${root}\WinSDK\Lib\x64;$Env:LIBPATH"
'''.lstrip()

ACTIVATE_VC9_X86 = r'''
Write-Output "activating Visual Studio 2008 environment for x86"
$root = "$env:LOCALAPPDATA\Programs\Common\Microsoft\Visual C++ for Python\9.0"
$Env:VCINSTALLDIR = "${root}\VC\"
$Env:WindowsSdkDir = "${root}\WinSDK\"
$Env:PATH = "${root}\VC\Bin;${root}\WinSDK\Bin;$Env:PATH"
$Env:INCLUDE = "${root}\VC\Include;${root}\WinSDK\Include;$Env:INCLUDE"
$Env:LIB = "${root}\VC\Lib;${root}\WinSDK\Lib;$Env:LIB"
$Env:LIBPATH = "${root}\VC\lib;${root}\WinSDK\Lib:$Env:LIBPATH"
'''.lstrip()

HG_PURGE = r'''
$Env:PATH = "C:\hgdev\venv-bootstrap\Scripts;$Env:PATH"
Set-Location C:\hgdev\src
hg.exe --config extensions.purge= purge --all
if ($LASTEXITCODE -ne 0) {
    throw "process exited non-0: $LASTEXITCODE"
}
Write-Output "purged Mercurial repo"
'''

HG_UPDATE_CLEAN = r'''
$Env:PATH = "C:\hgdev\venv-bootstrap\Scripts;$Env:PATH"
Set-Location C:\hgdev\src
hg.exe --config extensions.purge= purge --all
if ($LASTEXITCODE -ne 0) {{
    throw "process exited non-0: $LASTEXITCODE"
}}
hg.exe update -C {revision}
if ($LASTEXITCODE -ne 0) {{
    throw "process exited non-0: $LASTEXITCODE"
}}
hg.exe log -r .
Write-Output "updated Mercurial working directory to {revision}"
'''.lstrip()

BUILD_INNO = r'''
Set-Location C:\hgdev\src
$python = "C:\hgdev\python27-{arch}\python.exe"
C:\hgdev\python37-x64\python.exe contrib\packaging\inno\build.py --python $python
if ($LASTEXITCODE -ne 0) {{
    throw "process exited non-0: $LASTEXITCODE"
}}
'''.lstrip()

BUILD_WHEEL = r'''
Set-Location C:\hgdev\src
C:\hgdev\python27-{arch}\Scripts\pip.exe wheel --wheel-dir dist .
if ($LASTEXITCODE -ne 0) {{
    throw "process exited non-0: $LASTEXITCODE"
}}
'''

BUILD_WIX = r'''
Set-Location C:\hgdev\src
$python = "C:\hgdev\python27-{arch}\python.exe"
C:\hgdev\python37-x64\python.exe contrib\packaging\wix\build.py --python $python {extra_args}
if ($LASTEXITCODE -ne 0) {{
    throw "process exited non-0: $LASTEXITCODE"
}}
'''

RUN_TESTS = r'''
C:\hgdev\MinGW\msys\1.0\bin\sh.exe --login -c "cd /c/hgdev/src/tests && /c/hgdev/{python_path}/python.exe run-tests.py {test_flags}"
if ($LASTEXITCODE -ne 0) {{
    throw "process exited non-0: $LASTEXITCODE"
}}
'''


def get_vc_prefix(arch):
    if arch == 'x86':
        return ACTIVATE_VC9_X86
    elif arch == 'x64':
        return ACTIVATE_VC9_AMD64
    else:
        raise ValueError('illegal arch: %s; must be x86 or x64' % arch)


def fix_authorized_keys_permissions(winrm_client, path):
    commands = [
        '$ErrorActionPreference = "Stop"',
        'Repair-AuthorizedKeyPermission -FilePath %s -Confirm:$false' % path,
        'icacls %s /remove:g "NT Service\sshd"' % path,
    ]

    run_powershell(winrm_client, '\n'.join(commands))


def synchronize_hg(hg_repo: pathlib.Path, revision: str, ec2_instance):
    """Synchronize local Mercurial repo to remote EC2 instance."""

    winrm_client = ec2_instance.winrm_client

    with tempfile.TemporaryDirectory() as temp_dir:
        temp_dir = pathlib.Path(temp_dir)

        ssh_dir = temp_dir / '.ssh'
        ssh_dir.mkdir()
        ssh_dir.chmod(0o0700)

        # Generate SSH key to use for communication.
        subprocess.run([
            'ssh-keygen', '-t', 'rsa', '-b', '4096', '-N', '',
            '-f', str(ssh_dir / 'id_rsa')],
            check=True, capture_output=True)

        # Add it to ~/.ssh/authorized_keys on remote.
        # This assumes the file doesn't already exist.
        authorized_keys = r'c:\Users\Administrator\.ssh\authorized_keys'
        winrm_client.execute_cmd(r'mkdir c:\Users\Administrator\.ssh')
        winrm_client.copy(str(ssh_dir / 'id_rsa.pub'), authorized_keys)
        fix_authorized_keys_permissions(winrm_client, authorized_keys)

        public_ip = ec2_instance.public_ip_address

        ssh_config = temp_dir / '.ssh' / 'config'

        with open(ssh_config, 'w', encoding='utf-8') as fh:
            fh.write('Host %s\n' % public_ip)
            fh.write('  User Administrator\n')
            fh.write('  StrictHostKeyChecking no\n')
            fh.write('  UserKnownHostsFile %s\n' % (ssh_dir / 'known_hosts'))
            fh.write('  IdentityFile %s\n' % (ssh_dir / 'id_rsa'))

        env = dict(os.environ)
        env['HGPLAIN'] = '1'
        env['HGENCODING'] = 'utf-8'

        hg_bin = hg_repo / 'hg'

        res = subprocess.run(
            ['python2.7', str(hg_bin), 'log', '-r', revision, '-T', '{node}'],
            cwd=str(hg_repo), env=env, check=True, capture_output=True)

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

        args = [
            'python2.7', hg_bin,
            '--config', 'ui.ssh=ssh -F %s' % ssh_config,
            '--config', 'ui.remotecmd=c:/hgdev/venv-bootstrap/Scripts/hg.exe',
            'push', '-r', full_revision, 'ssh://%s/c:/hgdev/src' % public_ip,
        ]

        subprocess.run(args, cwd=str(hg_repo), env=env, check=True)

        run_powershell(winrm_client,
                       HG_UPDATE_CLEAN.format(revision=full_revision))

        # TODO detect dirty local working directory and synchronize accordingly.


def purge_hg(winrm_client):
    """Purge the Mercurial source repository on an EC2 instance."""
    run_powershell(winrm_client, HG_PURGE)


def find_latest_dist(winrm_client, pattern):
    """Find path to newest file in dist/ directory matching a pattern."""

    res = winrm_client.execute_ps(
        '$v = Get-ChildItem -Path C:\hgdev\src\dist -Filter "%s" '
        '| Sort-Object LastWriteTime -Descending '
        '| Select-Object -First 1\n'
        '$v.name' % pattern
    )
    return res[0]


def copy_latest_dist(winrm_client, pattern, dest_path):
    """Copy latest file matching pattern in dist/ directory.

    Given a WinRM client and a file pattern, find the latest file on the remote
    matching that pattern and copy it to the ``dest_path`` directory on the
    local machine.
    """
    latest = find_latest_dist(winrm_client, pattern)
    source = r'C:\hgdev\src\dist\%s' % latest
    dest = dest_path / latest
    print('copying %s to %s' % (source, dest))
    winrm_client.fetch(source, str(dest))


def build_inno_installer(winrm_client, arch: str, dest_path: pathlib.Path,
                         version=None):
    """Build the Inno Setup installer on a remote machine.

    Using a WinRM client, remote commands are executed to build
    a Mercurial Inno Setup installer.
    """
    print('building Inno Setup installer for %s' % arch)

    extra_args = []
    if version:
        extra_args.extend(['--version', version])

    ps = get_vc_prefix(arch) + BUILD_INNO.format(arch=arch,
                                                 extra_args=' '.join(extra_args))
    run_powershell(winrm_client, ps)
    copy_latest_dist(winrm_client, '*.exe', dest_path)


def build_wheel(winrm_client, arch: str, dest_path: pathlib.Path):
    """Build Python wheels on a remote machine.

    Using a WinRM client, remote commands are executed to build a Python wheel
    for Mercurial.
    """
    print('Building Windows wheel for %s' % arch)
    ps = get_vc_prefix(arch) + BUILD_WHEEL.format(arch=arch)
    run_powershell(winrm_client, ps)
    copy_latest_dist(winrm_client, '*.whl', dest_path)


def build_wix_installer(winrm_client, arch: str, dest_path: pathlib.Path,
                        version=None):
    """Build the WiX installer on a remote machine.

    Using a WinRM client, remote commands are executed to build a WiX installer.
    """
    print('Building WiX installer for %s' % arch)
    extra_args = []
    if version:
        extra_args.extend(['--version', version])

    ps = get_vc_prefix(arch) + BUILD_WIX.format(arch=arch,
                                                extra_args=' '.join(extra_args))
    run_powershell(winrm_client, ps)
    copy_latest_dist(winrm_client, '*.msi', dest_path)


def run_tests(winrm_client, python_version, arch, test_flags=''):
    """Run tests on a remote Windows machine.

    ``python_version`` is a ``X.Y`` string like ``2.7`` or ``3.7``.
    ``arch`` is ``x86`` or ``x64``.
    ``test_flags`` is a str representing extra arguments to pass to
    ``run-tests.py``.
    """
    if not re.match('\d\.\d', python_version):
        raise ValueError('python_version must be \d.\d; got %s' %
                         python_version)

    if arch not in ('x86', 'x64'):
        raise ValueError('arch must be x86 or x64; got %s' % arch)

    python_path = 'python%s-%s' % (python_version.replace('.', ''), arch)

    ps = RUN_TESTS.format(
        python_path=python_path,
        test_flags=test_flags or '',
    )

    run_powershell(winrm_client, ps)