setup.py

#!/usr/bin/env python3
""" Install packages for faceswap.py """

# >>> Environment
import ctypes
import json
import locale
import platform
import operator
import os
import re
import sys
from subprocess import CalledProcessError, run, PIPE, Popen

from pkg_resources import parse_requirements, Requirement

INSTALL_FAILED = False
# Revisions of tensorflow GPU and cuda/cudnn requirements
TENSORFLOW_REQUIREMENTS = {">=2.2.0,<2.4.0": ["10.1", "7.6"]}
# Mapping of Python packages to their conda names if different from pip or in non-default channel
CONDA_MAPPING = {
    # "opencv-python": ("opencv", "conda-forge"),  # Periodic issues with conda-forge opencv
    "fastcluster": ("fastcluster", "conda-forge"),
    "toposort": ("toposort", "conda-forge"),
    "imageio-ffmpeg": ("imageio-ffmpeg", "conda-forge")}


class Environment():
    """ The current install environment """
    def __init__(self, logger=None, updater=False):
        """ logger will override built in Output() function if passed in
            updater indicates that this is being run from update_deps.py
            so certain steps can be skipped/output limited """
        self.conda_required_packages = [("tk", )]
        self.output = logger if logger else Output()
        self.updater = updater
        # Flag that setup is being run by installer so steps can be skipped
        self.is_installer = False
        self.cuda_version = ""
        self.cudnn_version = ""
        self.enable_amd = False
        self.enable_docker = False
        self.enable_cuda = False
        self.required_packages = list()
        self.missing_packages = list()
        self.conda_missing_packages = list()

        self.process_arguments()
        self.check_permission()
        self.check_system()
        self.check_python()
        self.output_runtime_info()
        self.check_pip()
        self.upgrade_pip()

        self.installed_packages = self.get_installed_packages()
        self.installed_packages.update(self.get_installed_conda_packages())

    @property
    def encoding(self):
        """ Get system encoding """
        return locale.getpreferredencoding()

    @property
    def os_version(self):
        """ Get OS Version """
        return platform.system(), platform.release()

    @property
    def py_version(self):
        """ Get Python Version """
        return platform.python_version(), platform.architecture()[0]

    @property
    def is_conda(self):
        """ Check whether using Conda """
        return ("conda" in sys.version.lower() or
                os.path.exists(os.path.join(sys.prefix, 'conda-meta')))

    @property
    def is_admin(self):
        """ Check whether user is admin """
        try:
            retval = os.getuid() == 0
        except AttributeError:
            retval = ctypes.windll.shell32.IsUserAnAdmin() != 0
        return retval

    @property
    def is_virtualenv(self):
        """ Check whether this is a virtual environment """
        if not self.is_conda:
            retval = (hasattr(sys, "real_prefix") or
                      (hasattr(sys, "base_prefix") and sys.base_prefix != sys.prefix))
        else:
            prefix = os.path.dirname(sys.prefix)
            retval = (os.path.basename(prefix) == "envs")
        return retval

    def process_arguments(self):
        """ Process any cli arguments and dummy in cli arguments if calling from updater. """
        args = [arg for arg in sys.argv]  # pylint:disable=unnecessary-comprehension
        if self.updater:
            from lib.utils import get_backend  # pylint:disable=import-outside-toplevel
            args.append("--{}".format(get_backend()))

        for arg in args:
            if arg == "--installer":
                self.is_installer = True
            if arg == "--nvidia":
                self.enable_cuda = True
            if arg == "--amd":
                self.enable_amd = True

    def get_required_packages(self):
        """ Load requirements list """
        if self.enable_amd:
            suffix = "amd.txt"
        elif self.enable_cuda:
            suffix = "nvidia.txt"
        else:
            suffix = "cpu.txt"
        req_files = ["_requirements_base.txt", f"requirements_{suffix}"]
        pypath = os.path.dirname(os.path.realpath(__file__))
        requirements = list()
        git_requirements = list()
        for req_file in req_files:
            requirements_file = os.path.join(pypath, req_file)
            with open(requirements_file) as req:
                for package in req.readlines():
                    package = package.strip()
                    # parse_requirements can't handle git dependencies, so extract and then
                    # manually add to final list
                    if package and package.startswith("git+"):
                        git_requirements.append((package, []))
                        continue
                    if package and (not package.startswith(("#", "-r"))):
                        requirements.append(package)
        self.required_packages = [(pkg.name, pkg.specs)
                                  for pkg in parse_requirements(requirements)
                                  if pkg.marker is None or pkg.marker.evaluate()]
        self.required_packages.extend(git_requirements)

    def check_permission(self):
        """ Check for Admin permissions """
        if self.updater:
            return
        if self.is_admin:
            self.output.info("Running as Root/Admin")
        else:
            self.output.info("Running without root/admin privileges")

    def check_system(self):
        """ Check the system """
        if not self.updater:
            self.output.info("The tool provides tips for installation\n"
                             "and installs required python packages")
        self.output.info("Setup in %s %s" % (self.os_version[0], self.os_version[1]))
        if not self.updater and not self.os_version[0] in ["Windows", "Linux", "Darwin"]:
            self.output.error("Your system %s is not supported!" % self.os_version[0])
            sys.exit(1)

    def check_python(self):
        """ Check python and virtual environment status """
        self.output.info("Installed Python: {0} {1}".format(self.py_version[0],
                                                            self.py_version[1]))
        if not (self.py_version[0].split(".")[0] == "3"
                and self.py_version[0].split(".")[1] in ("7", "8")
                and self.py_version[1] == "64bit") and not self.updater:
            self.output.error("Please run this script with Python version 3.7 or 3.8 "
                              "64bit and try again.")
            sys.exit(1)

    def output_runtime_info(self):
        """ Output run time info """
        if self.is_conda:
            self.output.info("Running in Conda")
        if self.is_virtualenv:
            self.output.info("Running in a Virtual Environment")
        self.output.info("Encoding: {}".format(self.encoding))

    def check_pip(self):
        """ Check installed pip version """
        if self.updater:
            return
        try:
            import pip  # noqa pylint:disable=unused-import,import-outside-toplevel
        except ImportError:
            self.output.error("Import pip failed. Please Install python3-pip and try again")
            sys.exit(1)

    def upgrade_pip(self):
        """ Upgrade pip to latest version """
        if not self.is_conda:
            # Don't do this with Conda, as we must use Conda version of pip
            self.output.info("Upgrading pip...")
            pipexe = [sys.executable, "-m", "pip"]
            pipexe.extend(["install", "--no-cache-dir", "-qq", "--upgrade"])
            if not self.is_admin and not self.is_virtualenv:
                pipexe.append("--user")
            pipexe.append("pip")
            run(pipexe)
        import pip  # pylint:disable=import-outside-toplevel
        pip_version = pip.__version__
        self.output.info("Installed pip: {}".format(pip_version))

    def get_installed_packages(self):
        """ Get currently installed packages """
        installed_packages = dict()
        chk = Popen("\"{}\" -m pip freeze".format(sys.executable),
                    shell=True, stdout=PIPE)
        installed = chk.communicate()[0].decode(self.encoding).splitlines()

        for pkg in installed:
            if "==" not in pkg:
                continue
            item = pkg.split("==")
            installed_packages[item[0]] = item[1]
        return installed_packages

    def get_installed_conda_packages(self):
        """ Get currently installed conda packages """
        if not self.is_conda:
            return None
        chk = os.popen("conda list").read()
        installed = [re.sub(" +", " ", line.strip())
                     for line in chk.splitlines() if not line.startswith("#")]
        retval = dict()
        for pkg in installed:
            item = pkg.split(" ")
            retval[item[0]] = item[1]
        return retval

    def update_tf_dep(self):
        """ Update Tensorflow Dependency """
        if self.is_conda or not self.enable_cuda:
            # CPU/AMD doesn't need Cuda and Conda handles Cuda and cuDNN so nothing to do here
            return

        tf_ver = None
        cudnn_inst = self.cudnn_version.split(".")
        for key, val in TENSORFLOW_REQUIREMENTS.items():
            cuda_req = val[0]
            cudnn_req = val[1].split(".")
            if cuda_req == self.cuda_version and (cudnn_req[0] == cudnn_inst[0] and
                                                  cudnn_req[1] <= cudnn_inst[1]):
                tf_ver = key
                break
        if tf_ver:
            # Remove the version of tensorflow in requirements file and add the correct version
            # that corresponds to the installed Cuda/cuDNN versions
            self.required_packages = [pkg for pkg in self.required_packages
                                      if not pkg.startswith("tensorflow-gpu")]
            tf_ver = "tensorflow-gpu{}".format(tf_ver)
            self.required_packages.append(tf_ver)
            return

        self.output.warning(
            "The minimum Tensorflow requirement is 2.3 \n"
            "Tensorflow currently has no official prebuild for your CUDA, cuDNN "
            "combination.\nEither install a combination that Tensorflow supports or "
            "build and install your own tensorflow-gpu.\r\n"
            "CUDA Version: {}\r\n"
            "cuDNN Version: {}\r\n"
            "Help:\n"
            "Building Tensorflow: https://www.tensorflow.org/install/install_sources\r\n"
            "Tensorflow supported versions: "
            "https://www.tensorflow.org/install/source#tested_build_configurations".format(
                self.cuda_version, self.cudnn_version))

        custom_tf = input("Location of custom tensorflow-gpu wheel (leave "
                          "blank to manually install): ")
        if not custom_tf:
            return

        custom_tf = os.path.realpath(os.path.expanduser(custom_tf))
        if not os.path.isfile(custom_tf):
            self.output.error("{} not found".format(custom_tf))
        elif os.path.splitext(custom_tf)[1] != ".whl":
            self.output.error("{} is not a valid pip wheel".format(custom_tf))
        elif custom_tf:
            self.required_packages.append(custom_tf)

    def set_config(self):
        """ Set the backend in the faceswap config file """
        if self.enable_amd:
            backend = "amd"
        elif self.enable_cuda:
            backend = "nvidia"
        else:
            backend = "cpu"
        config = {"backend": backend}
        pypath = os.path.dirname(os.path.realpath(__file__))
        config_file = os.path.join(pypath, "config", ".faceswap")
        with open(config_file, "w") as cnf:
            json.dump(config, cnf)
        self.output.info("Faceswap config written to: {}".format(config_file))


class Output():
    """ Format and display output """
    def __init__(self):
        self.red = "\033[31m"
        self.green = "\033[32m"
        self.yellow = "\033[33m"
        self.default_color = "\033[0m"
        self.term_support_color = platform.system() in ("Linux", "Darwin")

    @staticmethod
    def __indent_text_block(text):
        """ Indent a text block """
        lines = text.splitlines()
        if len(lines) > 1:
            out = lines[0] + "\r\n"
            for i in range(1, len(lines)-1):
                out = out + "        " + lines[i] + "\r\n"
            out = out + "        " + lines[-1]
            return out
        return text

    def info(self, text):
        """ Format INFO Text """
        trm = "INFO    "
        if self.term_support_color:
            trm = "{}INFO   {} ".format(self.green, self.default_color)
        print(trm + self.__indent_text_block(text))

    def warning(self, text):
        """ Format WARNING Text """
        trm = "WARNING "
        if self.term_support_color:
            trm = "{}WARNING{} ".format(self.yellow, self.default_color)
        print(trm + self.__indent_text_block(text))

    def error(self, text):
        """ Format ERROR Text """
        global INSTALL_FAILED  # pylint:disable=global-statement
        trm = "ERROR   "
        if self.term_support_color:
            trm = "{}ERROR  {} ".format(self.red, self.default_color)
        print(trm + self.__indent_text_block(text))
        INSTALL_FAILED = True


class Checks():
    """ Pre-installation checks """
    def __init__(self, environment):
        self.env = environment
        self.output = Output()
        self.tips = Tips()

    # Checks not required for installer
        if self.env.is_installer:
            return

    # Ask AMD/Docker/Cuda
        self.amd_ask_enable()
        if not self.env.enable_amd:
            self.docker_ask_enable()
            self.cuda_ask_enable()
        if self.env.os_version[0] != "Linux" and self.env.enable_docker and self.env.enable_cuda:
            self.docker_confirm()
        if self.env.enable_docker:
            self.docker_tips()
            self.env.set_config()
            sys.exit(0)

    # Check for CUDA and cuDNN
        if self.env.enable_cuda and self.env.is_conda:
            self.output.info("Skipping Cuda/cuDNN checks for Conda install")
        elif self.env.enable_cuda and self.env.os_version[0] in ("Linux", "Windows"):
            check = CudaCheck()
            if check.cuda_version:
                self.env.cuda_version = check.cuda_version
                self.output.info("CUDA version: " + self.env.cuda_version)
            else:
                self.output.error("CUDA not found. Install and try again.\n"
                                  "Recommended version:      CUDA 10.1     cuDNN 7.6\n"
                                  "CUDA: https://developer.nvidia.com/cuda-downloads\n"
                                  "cuDNN: https://developer.nvidia.com/rdp/cudnn-download")
                return

            if check.cudnn_version:
                self.env.cudnn_version = ".".join(check.cudnn_version.split(".")[:2])
                self.output.info(f"cuDNN version: {self.env.cudnn_version}")
            else:
                self.output.error("cuDNN not found. See "
                                  "https://github.com/deepfakes/faceswap/blob/master/INSTALL.md#"
                                  "cudnn for instructions")
                return
        elif self.env.enable_cuda and self.env.os_version[0] not in ("Linux", "Windows"):
            self.tips.macos()
            self.output.warning("Cannot find CUDA on macOS")
            self.env.cuda_version = input("Manually specify CUDA version: ")

        self.env.update_tf_dep()
        if self.env.os_version[0] == "Windows":
            self.tips.pip()

    def amd_ask_enable(self):
        """ Enable or disable Plaidml for AMD"""
        self.output.info("AMD Support: AMD GPU support is currently limited.\r\n"
                         "Nvidia Users MUST answer 'no' to this option.")
        i = "n"
        if i in ("Y", "y"):
            self.output.info("AMD Support Enabled")
            self.env.enable_amd = True
        else:
            self.output.info("AMD Support Disabled")
            self.env.enable_amd = False

    def docker_ask_enable(self):
        """ Enable or disable Docker """
        i = input("Enable  Docker? [y/N] ")
        if i in ("Y", "y"):
            self.output.info("Docker Enabled")
            self.env.enable_docker = True
        else:
            self.output.info("Docker Disabled")
            self.env.enable_docker = False

    def docker_confirm(self):
        """ Warn if nvidia-docker on non-Linux system """
        self.output.warning("Nvidia-Docker is only supported on Linux.\r\n"
                            "Only CPU is supported in Docker for your system")
        self.docker_ask_enable()
        if self.env.enable_docker:
            self.output.warning("CUDA Disabled")
            self.env.enable_cuda = False

    def docker_tips(self):
        """ Provide tips for Docker use """
        if not self.env.enable_cuda:
            self.tips.docker_no_cuda()
        else:
            self.tips.docker_cuda()

    def cuda_ask_enable(self):
        """ Enable or disable CUDA """
        i = input("Enable  CUDA? [Y/n] ")
        if i in ("", "Y", "y"):
            self.output.info("CUDA Enabled")
            self.env.enable_cuda = True
        else:
            self.output.info("CUDA Disabled")
            self.env.enable_cuda = False


class CudaCheck():  # pylint:disable=too-few-public-methods
    """ Find the location of system installed Cuda and cuDNN on Windows and Linux. """

    def __init__(self):
        self.cuda_path = None
        self.cuda_version = None
        self.cudnn_version = None

        self._os = platform.system().lower()
        self._cuda_keys = [key for key in os.environ if key.lower().startswith("cuda_path_v")]
        self._cudnn_header_files = ["cudnn_version.h", "cudnn.h"]

        if self._os in ("windows", "linux"):
            self._cuda_check()
            self._cudnn_check()

    def _cuda_check(self):
        """ Obtain the location and version of Cuda and populate :attr:`cuda_version` and
        :attr:`cuda_path`

        Initially just calls `nvcc -V` to get the installed version of Cuda currently in use.
        If this fails, drills down to more OS specific checking methods.
        """
        chk = Popen("nvcc -V", shell=True, stdout=PIPE, stderr=PIPE)
        stdout, stderr = chk.communicate()
        if not stderr:
            version = re.search(r".*release (?P<cuda>\d+\.\d+)",
                                stdout.decode(locale.getpreferredencoding()))
            self.cuda_version = version.groupdict().get("cuda", None)
            locate = "where" if self._os == "windows" else "which"
            path = os.popen(f"{locate} nvcc").read()
            if path:
                path = path.split("\n")[0]  # Split multiple entries and take first found
                while True:  # Get Cuda root folder
                    path, split = os.path.split(path)
                    if split == "bin":
                        break
                self.cuda_path = path
            return

        # Failed to load nvcc, manual check
        getattr(self, f"_cuda_check_{self._os}")()

    def _cuda_check_linux(self):
        """ For Linux check the dynamic link loader for libcudart. If not found with ldconfig then
        attempt to find it in LD_LIBRARY_PATH. """
        chk = os.popen("ldconfig -p | grep -P \"libcudart.so.\\d+.\\d+\" | head -n 1").read()
        if not chk and os.environ.get("LD_LIBRARY_PATH"):
            for path in os.environ["LD_LIBRARY_PATH"].split(":"):
                chk = os.popen(f"ls {path} | grep -P -o \"libcudart.so.\\d+.\\d+\" | "
                               "head -n 1").read()
                if chk:
                    break
        if not chk:  # Cuda not found
            return

        cudavers = chk.strip().replace("libcudart.so.", "")
        self.cuda_version = cudavers[:cudavers.find(" ")]
        self.cuda_path = chk[chk.find("=>") + 3:chk.find("targets") - 1]

    def _cuda_check_windows(self):
        """ Check Windows CUDA Version and path from Environment Variables"""
        if not self._cuda_keys:  # Cuda environment variable not found
            return
        self.cuda_version = self._cuda_keys[0].lower().replace("cuda_path_v", "").replace("_", ".")
        self.cuda_path = os.environ[self._cuda_keys[0][0]]

    def _cudnn_check(self):
        """ Check Linux or Windows cuDNN Version from cudnn.h and add to :attr:`cudnn_version`. """
        cudnn_checkfiles = getattr(self, f"_get_checkfiles_{self._os}")()
        cudnn_checkfile = next((hdr for hdr in cudnn_checkfiles if os.path.isfile(hdr)), None)
        if not cudnn_checkfile:
            return
        found = 0
        with open(cudnn_checkfile, "r") as ofile:
            for line in ofile:
                if line.lower().startswith("#define cudnn_major"):
                    major = line[line.rfind(" ") + 1:].strip()
                    found += 1
                elif line.lower().startswith("#define cudnn_minor"):
                    minor = line[line.rfind(" ") + 1:].strip()
                    found += 1
                elif line.lower().startswith("#define cudnn_patchlevel"):
                    patchlevel = line[line.rfind(" ") + 1:].strip()
                    found += 1
                if found == 3:
                    break
        if found != 3:  # Full version could not be determined
            return
        self.cudnn_version = ".".join([str(major), str(minor), str(patchlevel)])

    def _get_checkfiles_linux(self):
        """ Return the the files to check for cuDNN locations for Linux by querying
        the dynamic link loader.

        Returns
        -------
        list
            List of header file locations to scan for cuDNN versions
        """
        chk = os.popen("ldconfig -p | grep -P \"libcudnn.so.\\d+\" | head -n 1").read()
        chk = chk.strip().replace("libcudnn.so.", "")
        if not chk:
            return list()

        cudnn_vers = chk[0]
        header_files = [f"cudnn_v{cudnn_vers}.h"] + self._cudnn_header_files

        cudnn_path = os.path.realpath(chk[chk.find("=>") + 3:chk.find("libcudnn") - 1])
        cudnn_path = cudnn_path.replace("lib", "include")
        cudnn_checkfiles = [os.path.join(cudnn_path, header) for header in header_files]
        return cudnn_checkfiles

    def _get_checkfiles_windows(self):
        """ Return the check-file locations for Windows. Just looks inside the include folder of
        the discovered :attr:`cuda_path`

        Returns
        -------
        list
            List of header file locations to scan for cuDNN versions
        """
        # TODO A more reliable way of getting the windows location
        if not self.cuda_path:
            return list()
        scandir = os.path.join(self.cuda_path, "include")
        cudnn_checkfiles = [os.path.join(scandir, header) for header in self._cudnn_header_files]
        return cudnn_checkfiles


class Install():
    """ Install the requirements """
    def __init__(self, environment):
        self._operators = {"==": operator.eq,
                           ">=": operator.ge,
                           "<=": operator.le,
                           ">": operator.gt,
                           "<": operator.lt}
        self.output = environment.output
        self.env = environment

        if not self.env.is_installer and not self.env.updater:
            self.ask_continue()
        self.env.get_required_packages()
        self.check_missing_dep()
        self.check_conda_missing_dep()
        if (self.env.updater and
                not self.env.missing_packages and not self.env.conda_missing_packages):
            self.output.info("All Dependencies are up to date")
            return
        if self.env.updater:
            self._remove_unrequired_packages()
        self.install_missing_dep()
        if self.env.updater:
            return
        self.output.info("All python3 dependencies are met.\r\nYou are good to go.\r\n\r\n"
                         "Enter:  'python faceswap.py -h' to see the options\r\n"
                         "        'python faceswap.py gui' to launch the GUI")

    def ask_continue(self):
        """ Ask Continue with Install """
        inp = input("Please ensure your System Dependencies are met. Continue? [y/N] ")
        if inp in ("", "N", "n"):
            self.output.error("Please install system dependencies to continue")
            sys.exit(1)

    def check_missing_dep(self):
        """ Check for missing dependencies """
        for key, specs in self.env.required_packages:
            if self.env.is_conda:
                # Get Conda alias for Key
                key = CONDA_MAPPING.get(key, (key, None))[0]
            if (key == "git+https://github.com/deepfakes/nvidia-ml-py3.git" and
                    self.env.installed_packages.get("nvidia-ml-py3", "") == "7.352.1"):
                # Annoying explicit hack to get around our custom version of nvidia-ml=py3 being
                # constantly re-downloaded
                continue
            if key not in self.env.installed_packages:
                self.env.missing_packages.append((key, specs))
                continue
            installed_vers = self.env.installed_packages.get(key, "")
            if specs and not all(self._operators[spec[0]](installed_vers, spec[1])
                                 for spec in specs):
                self.env.missing_packages.append((key, specs))

    def check_conda_missing_dep(self):
        """ Check for conda missing dependencies """
        if not self.env.is_conda:
            return
        for pkg in self.env.conda_required_packages:
            key = pkg[0].split("==")[0]
            if key not in self.env.installed_packages:
                self.env.conda_missing_packages.append(pkg)
                continue
            if len(pkg[0].split("==")) > 1:
                if pkg[0].split("==")[1] != self.env.installed_conda_packages.get(key):
                    self.env.conda_missing_packages.append(pkg)
                    continue

    def _remove_unrequired_packages(self):
        """ Remove packages that have been installed by Pip that might now be installed by
        Conda.

        This specifically relates to tensorflow 2.2 when a Conda version was not available for
        Windows, so needed to be installed by Pip, with the Cuda toolkit coming from Conda.

        This method is left here in case it is needed in the future. """
        if not self.env.is_conda or self.env.os_version[0] != "Windows":
            return
        installed_pip = self.env.get_installed_packages()
        if "tensorflow-gpu" not in installed_pip:
            return
        if not installed_pip["tensorflow-gpu"].startswith("2.2"):
            return
        # The below are a load of pip installed tf dependencies. They may not need to be all
        # removed, but won't hurt to take them out of pip and put in Conda
        remove_packages = ["urllib3", "pyasn1", "idna", "chardet", "rsa", "requests",
                           "pyasn1-modules", "oauthlib", "cachetools", "requests-oauthlib",
                           "google-auth", "werkzeug", "tensorboard-plugin-wit", "protobuf",
                           "numpy", "markdown", "grpcio", "google-auth-oauthlib", "absl-py",
                           "wrapt", "termcolor", "tensorflow-gpu-estimator", "tensorboard",
                           "opt-einsum", "keras-preprocessing", "h5py", "google-pasta", "gast",
                           "astunparse", "tensorflow-gpu"]
        self.output.info("Uninstalling Pip Tensorflow 2.2")
        pipexe = [sys.executable, "-m", "pip", "uninstall", "-y", "-qq"]
        if not self.env.is_admin and not self.env.is_virtualenv:
            pipexe.append("--user")
        pipexe.extend([pkg for pkg in remove_packages if pkg in installed_pip])

        try:
            run(pipexe, check=True)
        except CalledProcessError:
            self.output.warning("Couldn't remove Tensorflow 2.2 with pip. You should attempt this "
                                "manually")

    def install_missing_dep(self):
        """ Install missing dependencies """
        # Install conda packages first
        if self.env.conda_missing_packages:
            self.install_conda_packages()
        if self.env.missing_packages:
            self.install_python_packages()

    def install_python_packages(self):
        """ Install required pip packages """
        self.output.info("Installing Required Python Packages. This may take some time...")
        for pkg, version in self.env.missing_packages:
            if self.env.is_conda:
                pkg = CONDA_MAPPING.get(pkg, (pkg, None))
                channel = None if len(pkg) != 2 else pkg[1]
                pkg = pkg[0]
            if version:
                pkg = "{}{}".format(pkg, ",".join("".join(spec) for spec in version))
            if self.env.is_conda and not pkg.startswith("git"):
                verbose = pkg.startswith("tensorflow") or self.env.updater
                if self.conda_installer(pkg, verbose=verbose, channel=channel, conda_only=False):
                    continue
                if pkg.startswith("tensorflow-gpu"):
                    self._tensorflow_dependency_install()
            self.pip_installer(pkg)

    def install_conda_packages(self):
        """ Install required conda packages """
        self.output.info("Installing Required Conda Packages. This may take some time...")
        for pkg in self.env.conda_missing_packages:
            channel = None if len(pkg) != 2 else pkg[1]
            self.conda_installer(pkg[0], channel=channel, conda_only=True)

    def conda_installer(self, package, channel=None, verbose=False, conda_only=False):
        """ Install a conda package """
        #  Packages with special characters need to be enclosed in double quotes
        cuda_cudnn = None
        success = True
        condaexe = ["conda", "install", "-y"]
        if not verbose or self.env.updater:
            condaexe.append("-q")
        if channel:
            condaexe.extend(["-c", channel])

        # Windows TF2.3 doesn't pull in the Cuda toolkit, so we may as well be explicit
        # TODO This is not a robust enough check if we have more than 1 tf version
        if package.startswith("tensorflow-gpu"):  # Add toolkit
            # TODO Remove this hack to lower the max supported TF version when TF2.4 can be
            # installed by setup.py
            package = package.replace("2.5.0", "2.4.0")
            specs = Requirement.parse(package).specs
            for key, val in TENSORFLOW_REQUIREMENTS.items():
                req_specs = Requirement.parse("foobar" + key).specs
                if all(item in req_specs for item in specs):
                    cuda_cudnn = val
                    break

        if any(char in package for char in (" ", "<", ">", "*", "|")):
            package = f"\"{package}\""
        condaexe.append(package)

        if cuda_cudnn is not None:
            condaexe.extend([f"cudatoolkit={cuda_cudnn[0]}",
                             f"cudnn={cuda_cudnn[1]}"])
        self.output.info("Installing {}".format(package.replace("\"", "")))
        shell = self.env.os_version[0] == "Windows"
        try:
            if verbose:
                run(condaexe, check=True, shell=shell)
            else:
                with open(os.devnull, "w") as devnull:
                    run(condaexe, stdout=devnull, stderr=devnull, check=True, shell=shell)
        except CalledProcessError:
            if not conda_only:
                self.output.info(f"{package} not available in Conda. Installing with pip")
            else:
                self.output.warning(f"Couldn't install {package} with Conda. "
                                    "Please install this package manually")
            success = False
        return success

    def pip_installer(self, package):
        """ Install a pip package """
        pipexe = [sys.executable, "-m", "pip"]
        # hide info/warning and fix cache hang
        pipexe.extend(["install", "--no-cache-dir"])
        if not self.env.updater and not package.startswith("tensorflow"):
            pipexe.append("-qq")
        # install as user to solve perm restriction
        if not self.env.is_admin and not self.env.is_virtualenv:
            pipexe.append("--user")
        msg = f"Installing {package}"
        self.output.info(msg)
        pipexe.append(package)
        try:
            run(pipexe, check=True)
        except CalledProcessError:
            self.output.warning(f"Couldn't install {package} with pip. "
                                "Please install this package manually")

    def _tensorflow_dependency_install(self):
        """ Install the Cuda/cuDNN dependencies from Conda when tensorflow is not available
        in Conda.

        This was used whilst Tensorflow 2.2 was not available for Windows in Conda. It is kept
        here in case it is required again in the future.
        """
        # TODO This will need to be more robust if/when we accept multiple Tensorflow Versions
        versions = list(TENSORFLOW_REQUIREMENTS.values())[-1]
        condaexe = ["conda", "search"]
        pkgs = ["cudatoolkit", "cudnn"]
        shell = self.env.os_version[0] == "Windows"
        for pkg in pkgs:
            chk = Popen(condaexe + [pkg], shell=shell, stdout=PIPE)
            available = [line.split()
                         for line in chk.communicate()[0].decode(self.env.encoding).splitlines()
                         if line.startswith(pkg)]
            compatible = [req for req in available
                          if (pkg == "cudatoolkit" and req[1].startswith(versions[0]))
                          or (pkg == "cudnn" and versions[0] in req[2]
                              and req[1].startswith(versions[1]))]
            candidate = "==".join(sorted(compatible, key=lambda x: x[1])[-1][:2])
            self.conda_installer(candidate, verbose=True, conda_only=True)


class Tips():
    """ Display installation Tips """
    def __init__(self):
        self.output = Output()

    def docker_no_cuda(self):
        """ Output Tips for Docker without Cuda """
        self.output.info(
            "1. Install Docker\n"
            "https://www.docker.com/community-edition\n\n"
            "2. Build Docker Image For Faceswap\n"
            "docker build -t deepfakes-cpu -f Dockerfile.cpu .\n\n"
            "3. Mount faceswap volume and Run it\n"
            "# without GUI\n"
            "docker run -tid -p 8888:8888 \\ \n"
            "\t--hostname deepfakes-cpu --name deepfakes-cpu \\ \n"
            "\t-v {path}:/srv \\ \n"
            "\tdeepfakes-cpu\n\n"
            "# with gui. tools.py gui working.\n"
            "## enable local access to X11 server\n"
            "xhost +local:\n"
            "## create container\n"
            "nvidia-docker run -tid -p 8888:8888 \\ \n"
            "\t--hostname deepfakes-cpu --name deepfakes-cpu \\ \n"
            "\t-v {path}:/srv \\ \n"
            "\t-v /tmp/.X11-unix:/tmp/.X11-unix \\ \n"
            "\t-e DISPLAY=unix$DISPLAY \\ \n"
            "\t-e AUDIO_GID=`getent group audio | cut -d: -f3` \\ \n"
            "\t-e VIDEO_GID=`getent group video | cut -d: -f3` \\ \n"
            "\t-e GID=`id -g` \\ \n"
            "\t-e UID=`id -u` \\ \n"
            "\tdeepfakes-cpu \n\n"
            "4. Open a new terminal to run faceswap.py in /srv\n"
            "docker exec -it deepfakes-cpu bash".format(
                path=os.path.dirname(os.path.realpath(__file__))))
        self.output.info("That's all you need to do with a docker. Have fun.")

    def docker_cuda(self):
        """ Output Tips for Docker wit Cuda"""
        self.output.info(
            "1. Install Docker\n"
            "https://www.docker.com/community-edition\n\n"
            "2. Install latest CUDA\n"
            "CUDA: https://developer.nvidia.com/cuda-downloads\n\n"
            "3. Install Nvidia-Docker & Restart Docker Service\n"
            "https://github.com/NVIDIA/nvidia-docker\n\n"
            "4. Build Docker Image For Faceswap\n"
            "docker build -t deepfakes-gpu -f Dockerfile.gpu .\n\n"
            "5. Mount faceswap volume and Run it\n"
            "# without gui \n"
            "docker run -tid -p 8888:8888 \\ \n"
            "\t--hostname deepfakes-gpu --name deepfakes-gpu \\ \n"
            "\t-v {path}:/srv \\ \n"
            "\tdeepfakes-gpu\n\n"
            "# with gui.\n"
            "## enable local access to X11 server\n"
            "xhost +local:\n"
            "## enable nvidia device if working under bumblebee\n"
            "echo ON > /proc/acpi/bbswitch\n"
            "## create container\n"
            "nvidia-docker run -tid -p 8888:8888 \\ \n"
            "\t--hostname deepfakes-gpu --name deepfakes-gpu \\ \n"
            "\t-v {path}:/srv \\ \n"
            "\t-v /tmp/.X11-unix:/tmp/.X11-unix \\ \n"
            "\t-e DISPLAY=unix$DISPLAY \\ \n"
            "\t-e AUDIO_GID=`getent group audio | cut -d: -f3` \\ \n"
            "\t-e VIDEO_GID=`getent group video | cut -d: -f3` \\ \n"
            "\t-e GID=`id -g` \\ \n"
            "\t-e UID=`id -u` \\ \n"
            "\tdeepfakes-gpu\n\n"
            "6. Open a new terminal to interact with the project\n"
            "docker exec deepfakes-gpu python /srv/faceswap.py gui\n".format(
                path=os.path.dirname(os.path.realpath(__file__))))

    def macos(self):
        """ Output Tips for macOS"""
        self.output.info(
            "setup.py does not directly support macOS. The following tips should help:\n\n"
            "1. Install system dependencies:\n"
            "XCode from the Apple Store\n"
            "XQuartz: https://www.xquartz.org/\n\n"

            "2a. It is recommended to use Anaconda for your Python Virtual Environment as this\n"
            "will handle the installation of CUDA and cuDNN for you:\n"
            "https://www.anaconda.com/distribution/\n\n"

            "2b. If you do not want to use Anaconda you will need to manually install CUDA and "
            "cuDNN:\n"
            "CUDA: https://developer.nvidia.com/cuda-downloads"
            "cuDNN: https://developer.nvidia.com/rdp/cudnn-download\n\n")

    def pip(self):
        """ Pip Tips """
        self.output.info("1. Install PIP requirements\n"
                         "You may want to execute `chcp 65001` in cmd line\n"
                         "to fix Unicode issues on Windows when installing dependencies")


if __name__ == "__main__":
    ENV = Environment()
    Checks(ENV)
    ENV.set_config()
    if INSTALL_FAILED:
        sys.exit(1)
    Install(ENV)