install.py

import launch
import os

current_dir = os.path.dirname(os.path.realpath(__file__))
req_file = os.path.join(current_dir, "requirements.txt")

with open(req_file) as file:
    for lib in file:
        lib = lib.strip()
        if not lib or lib.startswith('#'):
            continue

        if not launch.is_installed(lib):
            # Special handling for nvdiffrast (not on PyPI, requires --no-build-isolation)
            if lib == 'nvdiffrast':
                launch.run_pip(
                    "install git+https://github.com/NVlabs/nvdiffrast.git --no-build-isolation",
                    "sd-instantmesh requirement: nvdiffrast")
            else:
                launch.run_pip(
                    f"install {lib}",
                    f"sd-instantmesh requirement: {lib}")