potiuk commented on pull request #19867:
URL: https://github.com/apache/airflow/pull/19867#issuecomment-981650929
Sounds simple enough:
```
#!/usr/bin/env python3
import subprocess
import sys
from os import execv
from pathlib import Path
AIRFLOW_SOURCES_DIR = Path(__file__).parent.resolve()
BUILD_DIR = AIRFLOW_SOURCES_DIR / ".build"
BREEZE_VENV_DIR = BUILD_DIR / "breeze2" / "venv"
BREEZE_VENV_BIN_DIR = BREEZE_VENV_DIR / "bin"
BREEZE_VENV_PIP = BREEZE_VENV_BIN_DIR / "pip"
BREEZE_VENV_BREEZE = BREEZE_VENV_BIN_DIR / "Breeze2"
BREEZE_SOURCE_PATH = AIRFLOW_SOURCES_DIR / "dev" / "breeze"
if not BREEZE_VENV_DIR.exists():
BREEZE_VENV_DIR.mkdir(parents=True, exist_ok=True)
subprocess.Popen([sys.executable, "-m", "venv",
f"{BREEZE_VENV_DIR}"]).wait()
subprocess.Popen([f"{BREEZE_VENV_PIP}", "install", "-e", "."],
cwd=BREEZE_SOURCE_PATH).wait()
execv(f"{BREEZE_VENV_BREEZE}", [f"{BREEZE_VENV_BREEZE}"] + sys.argv[1:])
```
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