import json,pathlib,subprocess,datetime,os,hashlib,shutil
def run(*a):return subprocess.check_output(a,text=True,stderr=subprocess.STDOUT)
root=pathlib.Path('/home/ps/huobao-gpu-selection');root.mkdir(exist_ok=True,mode=0o700);root.chmod(0o700)
state=root/'state.json'
if state.exists(): raise SystemExit('Preparation already recorded; inspect state instead of repeating')
backup=root/('backup-'+datetime.datetime.now().strftime('%Y%m%d-%H%M%S'));backup.mkdir(mode=0o700)
for name in ('comfyui','h3-caption-gpu3-canary-8a5f','canvas-h3-prompt-normalizer-healthy-20261026','huobao-vdn-normalizer','huobao-model-bridge','huobao-vdn-bridge'):
 (backup/(name+'.inspect.json')).write_text(run('docker','inspect',name))
for name in ('canvas-h3-prompt-normalizer-healthy-20261026','huobao-vdn-normalizer'):
 (backup/(name+'.app.py')).write_text(run('docker','exec',name,'cat','/app/app.py'))
d=json.loads((backup/'canvas-h3-prompt-normalizer-healthy-20261026.inspect.json').read_text())[0]
env=dict(x.split('=',1) for x in d['Config']['Env']);fn=env['COMFY_ADMISSION_FILE']
m=next(m for m in d['Mounts'] if fn.startswith(m['Destination']+'/'))
admission=pathlib.Path(m['Source'])/fn[len(m['Destination'])+1:]
raw=admission.read_bytes();value=json.loads(raw)
assert value=={'schema':1,'admit':['default','gpu3']},'Unexpected admission; no change made'
(backup/'admission.json').write_bytes(raw)
data={'backup':str(backup),'admission':str(admission),'original_admission_sha256':hashlib.sha256(raw).hexdigest(),'phase':'prepared'}
state.write_text(json.dumps(data,indent=2));state.chmod(0o600)
tmp=admission.with_name('admission.huobao-tmp.json');tmp.write_text(json.dumps({'schema':1,'admit':['default']}));tmp.chmod(admission.stat().st_mode & 0o777);os.replace(tmp,admission)
data['phase']='gpu3-draining';state.write_text(json.dumps(data,indent=2))
print('Backed up service definitions and temporarily stopped new GPU3 admission; existing jobs continue.',backup)