diff --git a/launch.py b/launch.py
new file mode 100644
index 000000000..b1445a288
--- /dev/null
+++ b/launch.py
@@ -0,0 +1,127 @@
+# this scripts installs necessary requirements and launches main program in webui.py
+
+import subprocess
+import os
+import sys
+import importlib.util
+import shlex
+
+dir_repos = "repositories"
+dir_tmp = "tmp"
+
+python = sys.executable
+git = os.environ.get('GIT', "git")
+torch_command = os.environ.get('TORCH_COMMAND', "pip install torch==1.12.1+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', "")
+
+k_diffusion_package = os.environ.get('K_DIFFUSION_PACKAGE', "git+https://github.com/crowsonkb/k-diffusion.git@1a0703dfb7d24d8806267c3e7ccc4caf67fd1331")
+gfpgan_package = os.environ.get('GFPGAN_PACKAGE', "git+https://github.com/TencentARC/GFPGAN.git@8d2447a2d918f8eba5a4a01463fd48e45126a379")
+
+stable_diffusion_commit_hash = os.environ.get('STABLE_DIFFUSION_COMMIT_HASH', "69ae4b35e0a0f6ee1af8bb9a5d0016ccb27e36dc")
+taming_transformers_commit_hash = os.environ.get('TAMING_TRANSFORMERS_COMMIT_HASH', "24268930bf1dce879235a7fddd0b2355b84d7ea6")
+codeformer_commit_hash = os.environ.get('CODEFORMER_COMMIT_HASH', "c5b4593074ba6214284d6acd5f1719b6c5d739af")
+blip_commit_hash = os.environ.get('BLIP_COMMIT_HASH', "48211a1594f1321b00f14c9f7a5b4813144b2fb9")
+
+def repo_dir(name):
+    return os.path.join(dir_repos, name)
+
+
+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 run_python(code, desc=None, errdesc=None):
+    return run(f'{python} -c "{code}"', desc, errdesc)
+
+
+def run_pip(args, desc=None):
+    return run(f'{python} -m pip {args} --prefer-binary', desc=f"Installing {desc}", errdesc=f"Couldn't install {desc}")
+
+
+def check_run(command):
+    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+    return result.returncode == 0
+
+
+def check_run_python(code):
+    return check_run(f'{python} -c "{code}"')
+
+
+def is_installed(package):
+    try:
+        spec = importlib.util.find_spec(package)
+    except ModuleNotFoundError:
+        return False
+
+    return spec is not None
+
+
+def git_clone(url, dir, name, commithash=None):
+    # TODO clone into temporary dir and move if successful
+
+    if os.path.exists(dir):
+        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}")
+
+
+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"):
+    run(f"{python} -m {torch_command}", "Installing torch", "Couldn't install torch")
+
+run_python("import torch; assert torch.cuda.is_available(), 'Torch is not able to use GPU'")
+
+if not is_installed("k_diffusion.sampling"):
+    run_pip(f"install {k_diffusion_package}", "k-diffusion")
+
+if not is_installed("gfpgan"):
+    run_pip(f"install {gfpgan_package}", "gfpgan")
+
+os.makedirs(dir_repos, exist_ok=True)
+
+git_clone("https://github.com/CompVis/stable-diffusion.git", repo_dir('stable-diffusion'), "Stable Diffusion", stable_diffusion_commit_hash)
+git_clone("https://github.com/CompVis/taming-transformers.git", repo_dir('taming-transformers'), "Taming Transformers", taming_transformers_commit_hash)
+git_clone("https://github.com/sczhou/CodeFormer.git", repo_dir('CodeFormer'), "CodeFormer", codeformer_commit_hash)
+git_clone("https://github.com/salesforce/BLIP.git", 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")
+
+sys.argv += shlex.split(commandline_args)
+
+
+def start_webui():
+    print(f"Launching Web UI with arguments: {' '.join(sys.argv[1:])}")
+    import webui
+    webui.webui()
+
+
+start_webui()
diff --git a/requirements.txt b/requirements.txt
index df7d2b8ff..aa001db55 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,5 @@
+transformers
+diffusers
 basicsr
 gfpgan
 gradio
diff --git a/requirements_versions.txt b/requirements_versions.txt
index c12d5712f..57480da7c 100644
--- a/requirements_versions.txt
+++ b/requirements_versions.txt
@@ -1,3 +1,5 @@
+transformers==4.19.2
+diffusers==0.2.4
 basicsr==1.4.2
 gfpgan
 gradio==3.3
diff --git a/webui.bat b/webui.bat
index 509830c88..bbe8f6c96 100644
--- a/webui.bat
+++ b/webui.bat
@@ -1,26 +1,16 @@
 @echo off
 
 if not defined PYTHON (set PYTHON=python)
-if not defined GIT (set GIT=git)
-if not defined COMMANDLINE_ARGS (set COMMANDLINE_ARGS=%*)
 if not defined VENV_DIR (set VENV_DIR=venv)
-if not defined TORCH_COMMAND (set TORCH_COMMAND=pip install torch==1.12.1+cu113 --extra-index-url https://download.pytorch.org/whl/cu113)
-if not defined REQS_FILE (set REQS_FILE=requirements_versions.txt)
 
 mkdir tmp 2>NUL
 
 %PYTHON% -c "" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :check_git
+if %ERRORLEVEL% == 0 goto :start_venv
 echo Couldn't launch python
 goto :show_stdout_stderr
 
-:check_git
-%GIT% --help >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :setup_venv
-echo Couldn't launch git
-goto :show_stdout_stderr
-
-:setup_venv
+:start_venv
 if [%VENV_DIR%] == [-] goto :skip_venv
 
 dir %VENV_DIR%\Scripts\Python.exe >tmp/stdout.txt 2>tmp/stderr.txt
@@ -35,105 +25,13 @@ goto :show_stdout_stderr
 
 :activate_venv
 set PYTHON="%~dp0%VENV_DIR%\Scripts\Python.exe"
-%PYTHON% --version
 echo venv %PYTHON%
-goto :print_commit
+goto :launch
 
 :skip_venv
-%PYTHON% --version
-
-:print_commit
-%GIT% rev-parse HEAD
-
-:install_torch
-%PYTHON% -c "import torch" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :check_gpu
-echo Installing torch...
-%PYTHON% -m %TORCH_COMMAND% >tmp/stdout.txt 2>tmp/stderr.txt
-
-if %ERRORLEVEL% == 0 goto :check_gpu
-echo Failed to install torch
-goto :show_stdout_stderr
-
-:check_gpu
-%PYTHON% -c "import torch; assert torch.cuda.is_available(), 'CUDA is not available'" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_sd_reqs
-echo Torch is not able to use GPU
-goto :show_stdout_stderr
-
-:install_sd_reqs
-%PYTHON% -c "import transformers; import wheel" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_k_diff
-echo Installing SD requirements...
-%PYTHON% -m pip install wheel transformers==4.19.2 diffusers invisible-watermark --prefer-binary >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_k_diff
-goto :show_stdout_stderr
-
-:install_k_diff
-%PYTHON% -c "import k_diffusion.sampling" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_GFPGAN
-echo Installing K-Diffusion...
-%PYTHON% -m pip install git+https://github.com/crowsonkb/k-diffusion.git@1a0703dfb7d24d8806267c3e7ccc4caf67fd1331 --prefer-binary --only-binary=psutil >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_GFPGAN
-goto :show_stdout_stderr
-
-
-:install_GFPGAN
-%PYTHON% -c "import gfpgan" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_reqs
-echo Installing GFPGAN
-%PYTHON% -m pip install git+https://github.com/TencentARC/GFPGAN.git@8d2447a2d918f8eba5a4a01463fd48e45126a379 --prefer-binary >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_reqs
-goto :show_stdout_stderr
-
-:install_reqs
-echo Installing requirements...
-%PYTHON% -m pip install -r %REQS_FILE% --prefer-binary >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :make_dirs
-goto :show_stdout_stderr
-
-:make_dirs
-mkdir repositories 2>NUL
-
-if exist repositories\stable-diffusion goto :clone_transformers
-echo Cloning Stable Difusion repository...
-%GIT% clone https://github.com/CompVis/stable-diffusion.git repositories\stable-diffusion >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :clone_transformers
-goto :show_stdout_stderr
-
-:clone_transformers
-if exist repositories\taming-transformers goto :clone_codeformer
-echo Cloning Taming Transforming repository...
-%GIT% clone https://github.com/CompVis/taming-transformers.git repositories\taming-transformers >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :clone_codeformer
-goto :show_stdout_stderr
-
-:clone_codeformer
-if exist repositories\CodeFormer goto :install_codeformer_reqs
-echo Cloning CodeFormer repository...
-%GIT% clone https://github.com/sczhou/CodeFormer.git repositories\CodeFormer >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :install_codeformer_reqs
-goto :show_stdout_stderr
-
-:install_codeformer_reqs
-%PYTHON% -c "import lpips" >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :clone_blip
-echo Installing requirements for CodeFormer...
-%PYTHON% -m pip install -r repositories\CodeFormer\requirements.txt --prefer-binary >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% == 0 goto :clone_blip
-goto :show_stdout_stderr
-
-:clone_blip
-if exist repositories\BLIP goto :launch
-echo Cloning BLIP repository...
-%GIT% clone https://github.com/salesforce/BLIP.git repositories\BLIP >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% NEQ 0 goto :show_stdout_stderr
-%GIT% -C repositories/BLIP checkout 48211a1594f1321b00f14c9f7a5b4813144b2fb9 >tmp/stdout.txt 2>tmp/stderr.txt
-if %ERRORLEVEL% NEQ 0 goto :show_stdout_stderr
 
 :launch
-echo Launching webui.py...
-%PYTHON% webui.py %COMMANDLINE_ARGS%
+%PYTHON% launch.py
 pause
 exit /b