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# this scripts installs necessary requirements and launches main program in webui.py
import subprocess
import os
import sys
import importlib.util
import shlex
import platform

dir_repos = "repositories"
python = sys.executable
git = os.environ.get('GIT', "git")
index_url = os.environ.get('INDEX_URL', "")


def extract_arg(args, name):
    return [x for x in args if x != name], name in args


def run(command, desc=None, errdesc=None):
    if desc is not None:
        print(desc)

    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)

    if result.returncode != 0:

        message = f"""{errdesc or 'Error running command'}.
Command: {command}
Error code: {result.returncode}
stdout: {result.stdout.decode(encoding="utf8", errors="ignore") if len(result.stdout)>0 else '<empty>'}
stderr: {result.stderr.decode(encoding="utf8", errors="ignore") if len(result.stderr)>0 else '<empty>'}
"""
        raise RuntimeError(message)

    return result.stdout.decode(encoding="utf8", errors="ignore")


def check_run(command):
    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
    return result.returncode == 0


def is_installed(package):
    try:
        spec = importlib.util.find_spec(package)
    except ModuleNotFoundError:
        return False

    return spec is not None


def repo_dir(name):
    return os.path.join(dir_repos, name)


def run_python(code, desc=None, errdesc=None):
    return run(f'"{python}" -c "{code}"', desc, errdesc)


def run_pip(args, desc=None):
    index_url_line = f' --index-url {index_url}' if index_url != '' else ''
    return run(f'"{python}" -m pip {args} --prefer-binary{index_url_line}', desc=f"Installing {desc}", errdesc=f"Couldn't install {desc}")


def check_run_python(code):
    return check_run(f'"{python}" -c "{code}"')


def git_clone(url, dir, name, commithash=None):
    # TODO clone into temporary dir and move if successful

    if os.path.exists(dir):
        if commithash is None:
            return

        current_hash = run(f'"{git}" -C {dir} rev-parse HEAD', None, f"Couldn't determine {name}'s hash: {commithash}").strip()
        if current_hash == commithash:
            return

        run(f'"{git}" -C {dir} fetch', f"Fetching updates for {name}...", f"Couldn't fetch {name}")
        run(f'"{git}" -C {dir} checkout {commithash}', f"Checking out commit for {name} with hash: {commithash}...", f"Couldn't checkout commit {commithash} for {name}")
        return

    run(f'"{git}" clone "{url}" "{dir}"', f"Cloning {name} into {dir}...", f"Couldn't clone {name}")

    if commithash is not None:
        run(f'"{git}" -C {dir} checkout {commithash}', None, "Couldn't checkout {name}'s hash: {commithash}")

        
def version_check(commit):
    try:
        import requests
        commits = requests.get('https://api.github.com/repos/AUTOMATIC1111/stable-diffusion-webui/branches/master').json()
        if commit != "<none>" and commits['commit']['sha'] != commit:
            print("--------------------------------------------------------")
            print("| You are not up to date with the most recent release. |")
            print("| Consider running `git pull` to update.               |")
            print("--------------------------------------------------------")
        elif commits['commit']['sha'] == commit:
            print("You are up to date with the most recent release.")
        else:
            print("Not a git clone, can't perform version check.")
    except Exception as e:
        print("versipm check failed",e)

        
def prepare_enviroment():
    torch_command = os.environ.get('TORCH_COMMAND', "pip install torch==1.12.1+cu113 torchvision==0.13.1+cu113 --extra-index-url https://download.pytorch.org/whl/cu113")
    requirements_file = os.environ.get('REQS_FILE', "requirements_versions.txt")
    commandline_args = os.environ.get('COMMANDLINE_ARGS', "")

    gfpgan_package = os.environ.get('GFPGAN_PACKAGE', "git+https://github.com/TencentARC/GFPGAN.git@8d2447a2d918f8eba5a4a01463fd48e45126a379")
    clip_package = os.environ.get('CLIP_PACKAGE', "git+https://github.com/openai/CLIP.git@d50d76daa670286dd6cacf3bcd80b5e4823fc8e1")
    deepdanbooru_package = os.environ.get('DEEPDANBOORU_PACKAGE', "git+https://github.com/KichangKim/DeepDanbooru.git@d91a2963bf87c6a770d74894667e9ffa9f6de7ff")

    xformers_windows_package = os.environ.get('XFORMERS_WINDOWS_PACKAGE', 'https://github.com/C43H66N12O12S2/stable-diffusion-webui/releases/download/f/xformers-0.0.14.dev0-cp310-cp310-win_amd64.whl')

    stable_diffusion_repo = os.environ.get('STABLE_DIFFUSION_REPO', "https://github.com/CompVis/stable-diffusion.git")
    taming_transformers_repo = os.environ.get('TAMING_REANSFORMERS_REPO', "https://github.com/CompVis/taming-transformers.git")
    k_diffusion_repo = os.environ.get('K_DIFFUSION_REPO', 'https://github.com/crowsonkb/k-diffusion.git')
    codeformer_repo = os.environ.get('CODEFORMET_REPO', 'https://github.com/sczhou/CodeFormer.git')
    blip_repo = os.environ.get('BLIP_REPO', 'https://github.com/salesforce/BLIP.git')

    stable_diffusion_commit_hash = os.environ.get('STABLE_DIFFUSION_COMMIT_HASH', "69ae4b35e0a0f6ee1af8bb9a5d0016ccb27e36dc")
    taming_transformers_commit_hash = os.environ.get('TAMING_TRANSFORMERS_COMMIT_HASH', "24268930bf1dce879235a7fddd0b2355b84d7ea6")
    k_diffusion_commit_hash = os.environ.get('K_DIFFUSION_COMMIT_HASH', "f4e99857772fc3a126ba886aadf795a332774878")
    codeformer_commit_hash = os.environ.get('CODEFORMER_COMMIT_HASH', "c5b4593074ba6214284d6acd5f1719b6c5d739af")
    blip_commit_hash = os.environ.get('BLIP_COMMIT_HASH', "48211a1594f1321b00f14c9f7a5b4813144b2fb9")

    sys.argv += shlex.split(commandline_args)

    sys.argv, skip_torch_cuda_test = extract_arg(sys.argv, '--skip-torch-cuda-test')
    sys.argv, reinstall_xformers = extract_arg(sys.argv, '--reinstall-xformers')
    sys.argv, update_check = extract_arg(sys.argv, '--update-check')
    xformers = '--xformers' in sys.argv
    deepdanbooru = '--deepdanbooru' in sys.argv
    ngrok = '--ngrok' in sys.argv

    try:
        commit = run(f"{git} rev-parse HEAD").strip()
    except Exception:
        commit = "<none>"

    print(f"Python {sys.version}")
    print(f"Commit hash: {commit}")
    
    if not is_installed("torch") or not is_installed("torchvision"):
        run(f'"{python}" -m {torch_command}', "Installing torch and torchvision", "Couldn't install torch")

    if not skip_torch_cuda_test:
        run_python("import torch; assert torch.cuda.is_available(), 'Torch is not able to use GPU; add --skip-torch-cuda-test to COMMANDLINE_ARGS variable to disable this check'")

    if not is_installed("gfpgan"):
        run_pip(f"install {gfpgan_package}", "gfpgan")

    if not is_installed("clip"):
        run_pip(f"install {clip_package}", "clip")

    if (not is_installed("xformers") or reinstall_xformers) and xformers:
        if platform.system() == "Windows":
            if platform.python_version().startswith("3.10"):
                run_pip(f"install -U -I --no-deps {xformers_windows_package}", "xformers")
            else:
                print("Installation of xformers is not supported in this version of Python.")
                print("You can also check this and build manually: https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Xformers#building-xformers-on-windows-by-duckness")
                if not is_installed("xformers"):
                    exit(0)
        elif platform.system() == "Linux":
            run_pip("install xformers", "xformers")

    if not is_installed("deepdanbooru") and deepdanbooru:
        run_pip(f"install {deepdanbooru_package}#egg=deepdanbooru[tensorflow] tensorflow==2.10.0 tensorflow-io==0.27.0", "deepdanbooru")

    if not is_installed("pyngrok") and ngrok:
        run_pip("install pyngrok", "ngrok")

    os.makedirs(dir_repos, exist_ok=True)

    git_clone(stable_diffusion_repo, repo_dir('stable-diffusion'), "Stable Diffusion", stable_diffusion_commit_hash)
    git_clone(taming_transformers_repo, repo_dir('taming-transformers'), "Taming Transformers", taming_transformers_commit_hash)
    git_clone(k_diffusion_repo, repo_dir('k-diffusion'), "K-diffusion", k_diffusion_commit_hash)
    git_clone(codeformer_repo, repo_dir('CodeFormer'), "CodeFormer", codeformer_commit_hash)
    git_clone(blip_repo, repo_dir('BLIP'), "BLIP", blip_commit_hash)

    if not is_installed("lpips"):
        run_pip(f"install -r {os.path.join(repo_dir('CodeFormer'), 'requirements.txt')}", "requirements for CodeFormer")

    run_pip(f"install -r {requirements_file}", "requirements for Web UI")

    if update_check:
        version_check(commit)
    
    if "--exit" in sys.argv:
        print("Exiting because of --exit argument")
        exit(0)


def start_webui():
    print(f"Launching Web UI with arguments: {' '.join(sys.argv[1:])}")
    import webui
    webui.webui()


if __name__ == "__main__":
    prepare_enviroment()
    start_webui()