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 #!/usr/bin/env python3
 import argparse
 import fnmatch
 import os
 import re
 import shutil
 import subprocess
 import sys
 import time
 from datetime import datetime
 from concurrent.futures import ThreadPoolExecutor, as_completed
 import Configuration.Geometry.defaultPhase2ConditionsEra_cff as _settings
 _PH2_GLOBAL_TAG, _PH2_ERA = _settings.get_era_and_conditions(_settings.DEFAULT_VERSION)
 
 # Automatically generate the default geometry from DEFAULT_VERSION
 _PH2_GEOMETRY = f"Extended{_settings.DEFAULT_VERSION}"
 
 # Get the actual era name from the version key
 _PH2_ERA_NAME = _settings.properties['Run4'][_settings.DEFAULT_VERSION]['Era']
 
 # Function to display help information
 def print_help():
     help_text = """
     This script runs HLT test configurations for the CMS Phase2 upgrade.
 
     Arguments:
     --globaltag       : GlobalTag for the CMS conditions (required)
     --geometry        : Geometry setting for the CMS process (required)
     --events          : Number of events to process (default: 1)
     --threads         : Number of threads to use (default: 1)
     --parallelJobs    : Number of parallel cmsRun and hltDiff executions (default: 4)
     --restrictPathsTo : Restrict paths to be run to a user defined subset (e.g. "HLT_Ele*")
     --procModifiers   : Optionally use one (or more) cmssw processModifier
     --cachedInput     : Optionally use an existing RAW data file (do not regenerate it from scratch)
     --dryRun          : Optionally do not run any of the configuration created
 
     Example usage:
     hltPhase2UpgradeIntegrationTests --globaltag auto:phase2_realistic_T33 --geometry Extended2026D110 --events 10 --threads 4
     """
     print(help_text)
 
 # Function to run a shell command and handle errors
 def run_command(command, log_file=None, workdir=None):
     try:
         print(f"Running command: {command}")
         with open(log_file, "w") as log:
             subprocess.run(command, shell=True, check=True, cwd=workdir, stdout=log, stderr=log)
     except subprocess.CalledProcessError as e:
         print(f"Error running command: {e}")
         return e.returncode  # Return the error code
        
     return 0  # Return 0 for success
 
 # Function to compare the single file HLT results with the respect to a the base
 def compare_single_file(root_file, base_root_file, num_events, output_dir):
     root_path = os.path.join(output_dir, root_file)
     print(f"Comparing {root_path} with {base_root_file} using hltDiff...")
 
     # Run the hltDiff command
     hlt_diff_command = f"hltDiff -o {base_root_file} -n {root_path}"
     result = subprocess.run(hlt_diff_command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
     # Decode and process the output
     output = result.stdout.decode("utf-8")
     print(output)  # Print for debug purposes
 
     # Use a dynamic check based on the number of events configured
     expected_match_string = f"Found {num_events} matching events, out of which 0 have different HLT results"
 
     # Check if the output contains the expected match string
     if expected_match_string not in output:
         return f"Error: {root_file} has different HLT results!"
 
     return None  # Return None if no issues are found
 
 # Argument Parser for command-line configuration
 parser = argparse.ArgumentParser(description="Run HLT Test Configurations")
 parser.add_argument("--globaltag", default=_PH2_GLOBAL_TAG, help="GlobalTag for the CMS conditions")
 parser.add_argument("--geometry", default=_PH2_GEOMETRY, help="Geometry setting for the CMS process")  # Auto-generated geometry default
 parser.add_argument("--era", default=_PH2_ERA_NAME, help="Era setting for the CMS process")  # Convert _PH2_ERA to string
 parser.add_argument("--events", type=int, default=10, help="Number of events to process")
 parser.add_argument("--parallelJobs", type=int, default=4, help="Number of parallel cmsRun HLT jobs")
 parser.add_argument("--threads", type=int, default=1, help="Number of threads to use")
 parser.add_argument("--restrictPathsTo", nargs='+', default=[], help="List of HLT paths to restrict to")
 parser.add_argument("--cachedInput", default=None, help="Predefined input file to use instead of running TTbar GEN,SIM step")
 parser.add_argument("--procModifiers", default=None, help="Optional process modifier for cmsDriver")  # New argument for procModifiers
 parser.add_argument("--dryRun", action="store_true", help="Only generate configurations without running them")
 
 # Step 0: Capture the start time and print the start timestamp
 start_time = time.time()
 start_timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
 print("------------------------------------------------------------")
 print(f"Script started at {start_timestamp}")
 print("------------------------------------------------------------")
 
 # Parse arguments
 try:
     args = parser.parse_args()
 except SystemExit:
     print_help()
     sys.exit(0)
 
 global_tag = args.globaltag
 era = args.era
 geometry = args.geometry
 num_events = args.events
 num_threads = args.threads
 num_parallel_jobs = args.parallelJobs
 restrict_paths_to = args.restrictPathsTo
 proc_modifiers = args.procModifiers  # Store the procModifiers option
 
 # Print the values in a nice formatted manner
 print(f"{'Configuration Summary':^40}")
 print("=" * 40)
 print(f"Global Tag:           {global_tag}")
 print(f"Geometry:             {geometry}")
 print(f"Era:                  {era}")
 print(f"Num Events:           {num_events}")
 print(f"Num Threads:          {num_threads}")
 print(f"Num Parallel Jobs:    {num_parallel_jobs}")
 # Print restrictPathsTo if provided
 if restrict_paths_to:
     print(f"Restricting paths to: {', '.join(restrict_paths_to)}")
 # Print procModifiers if provided
 if proc_modifiers:
     print(f"Proc Modifiers:       {proc_modifiers}")
 if args.cachedInput:
     print(f"Using cached input file: {args.cachedInput}")
 else:
     print(f"Using regenerated GEN-SIM-DIGI-RAW file from scratch")
 print("=" * 40)
 
 # Directory where all test configurations will be stored
 output_dir = "hlt_test_configs"
 # If the directory exists, remove it first
 if os.path.exists(output_dir):
     shutil.rmtree(output_dir)
 
 # Create the directory
 os.makedirs(output_dir)
 
 # Define the cmsDriver.py command to create the base configuration
 # If cachedInput is provided, use it as the input for the base cmsDriver command
 if args.cachedInput:
     base_cmsdriver_command = (
         f"cmsDriver.py Phase2 -s L1P2GT,HLT:75e33_timing "
         f"--conditions {global_tag} -n {num_events} --eventcontent FEVTDEBUGHLT "
         f"--geometry {geometry} --era {era} --filein {args.cachedInput} --fileout {output_dir}/hlt.root --no_exec "
         f"--mc --nThreads {num_threads} "
         f"--processName=HLTX "
         f"--inputCommands='keep *, drop *_hlt*_*_HLT, drop triggerTriggerFilterObjectWithRefs_l1t*_*_HLT' "
         f"--customise SLHCUpgradeSimulations/Configuration/aging.customise_aging_1000 "
         f'--customise_commands "process.options.wantSummary=True"'
     )
 else:
     base_cmsdriver_command = (
         f"cmsDriver.py Phase2 -s L1P2GT,HLT:75e33_timing "
         f"--conditions {global_tag} -n {num_events} --eventcontent FEVTDEBUGHLT "
         f"--geometry {geometry} --era {era} --filein file:{output_dir}/step1.root --fileout {output_dir}/hlt.root --no_exec "
         f"--nThreads {num_threads} "
         f"--customise SLHCUpgradeSimulations/Configuration/aging.customise_aging_1000 "
         f'--customise_commands "process.options.wantSummary=True"'
     )
 
 # Add procModifiers if provided
 if proc_modifiers:
     base_cmsdriver_command += f" --procModifiers {proc_modifiers}"
 
 # The base configuration file and the dumped configuration file
 base_config_file = os.path.join(output_dir, "Phase2_L1P2GT_HLT.py")
 dumped_config_file = os.path.join(output_dir, "Phase2_dump.py")
 log_file = os.path.join(output_dir, "hlt.log")
 
 # Step 1: Run the cmsDriver.py command to generate the base configuration in the output directory
 print(f"Running cmsDriver.py to generate the base config: {base_config_file}")
 subprocess.run(base_cmsdriver_command, shell=True, cwd=output_dir)
 
 # Step 2: Use edmConfigDump to dump the full configuration
 print(f"Dumping the full configuration using edmConfigDump to {dumped_config_file}")
 with open(dumped_config_file, "w") as dump_file, open(log_file, "w") as log:
     subprocess.run(f"edmConfigDump {base_config_file}", shell=True, stdout=dump_file, stderr=log)
 
 # Step 3: Extract the list of HLT paths from the dumped configuration
 print(f"Extracting HLT paths from {dumped_config_file}...")
 
 # Read the dumped configuration to extract HLT paths
 with open(dumped_config_file, "r") as f:
     config_content = f.read()
 
 # Use regex to find all HLT and L1T paths defined in process.schedule
 unsorted_hlt_paths = re.findall(r"process\.(HLT_[A-Za-z0-9_]+|L1T_[A-Za-z0-9_]+)", config_content)
 
 # Remove duplicates and sort alphabetically
 hlt_paths = sorted(set(unsorted_hlt_paths))
 
 if not hlt_paths:
     print("No HLT paths found in the schedule!")
     exit(1)
 
 print(f"Found {len(hlt_paths)} HLT paths.")
 
 # Step 3b: Restrict paths using wildcard patterns if the option is provided
 if restrict_paths_to:
     valid_paths = set()  # Using a set to store matched paths
 
     # Iterate over each provided pattern
     for pattern in restrict_paths_to:
         # Use fnmatch to match the pattern to hlt_paths
         matched = fnmatch.filter(hlt_paths, pattern)
         valid_paths.update(matched)  # Add matches to the set of valid paths
 
         # If no matches found, emit a warning for that pattern
         if not matched:
             print(f"Warning: No paths matched the pattern: {pattern}")
 
     # Convert the set to a sorted list
     valid_paths = sorted(valid_paths)
 
     # If no valid paths remain after filtering, exit
     if not valid_paths:
         print("Error: None of the specified patterns matched any paths. Exiting.")
         exit(1)
 
     # Update hlt_paths to contain only the valid ones
     hlt_paths = valid_paths
 
     # Continue using the restricted hlt_paths further down the script
     print(f"Using {len(hlt_paths)} HLT paths after applying restrictions.")
 
 # Step 4: Broadened Regex for Matching process.schedule
 schedule_match = re.search(
     r"(process\.schedule\s*=\s*cms\.Schedule\(\*?\s*\[)([\s\S]+?)(\]\s*\))", 
     config_content
 )
 
 if not schedule_match:
     print("No schedule match found after tweaking regex! Exiting...")
     exit(1)
 else:
     print(f"Matched schedule section.")
 
 # Step 5: Generate N configurations by modifying the dumped config to keep only one path at a time
 for path_name in hlt_paths:
     # Create a new configuration file for this path
     config_filename = os.path.join(output_dir, f"Phase2_{path_name}.py")
     
     # Define regex to find all HLT paths in the cms.Schedule and replace them
     def replace_hlt_paths(match):
         all_paths = match.group(2).split(", ")
         # Keep non-HLT/L1T paths and include only the current HLT or L1T path
         filtered_paths = [path for path in all_paths if not re.match(r"process\.(HLT_|L1T_)", path) or f"process.{path_name}" in path]
         return match.group(1) + ", ".join(filtered_paths) + match.group(3)
 
     # Apply the regex to remove all HLT and L1T paths except the current one
     modified_content = re.sub(
         r"(process\.schedule\s*=\s*cms\.Schedule\(\*?\s*\[)([\s\S]+?)(\]\s*\))",
         replace_hlt_paths,
         config_content
     )
 
     # Modify the fileout parameter to save a unique root file for each path
     modified_content = re.sub(
         r"fileName = cms\.untracked\.string\('.*'\)", 
         f"fileName = cms.untracked.string('{output_dir}/{path_name}.root')", 
         modified_content
     )
 
     # Write the new config to a file
     with open(config_filename, "w") as new_config:
         new_config.write(modified_content)
     
     print(f"Generated config: {config_filename}")
 
 print(f"Generated {len(hlt_paths)} configuration files in the {output_dir} directory.")
 
 # Step 6: Run cmsDriver.py for TTbar GEN,SIM steps and save the output in output_dir
 ttbar_config_file = os.path.join(output_dir, "TTbar_GEN_SIM_step.py")
 ttbar_command = (
     f"cmsDriver.py TTbar_14TeV_TuneCP5_cfi -s GEN,SIM,DIGI:pdigi_valid,L1TrackTrigger,L1,L1P2GT,DIGI2RAW -n {num_events} "
     f"--conditions {global_tag} --beamspot DBrealisticHLLHC --datatier GEN-SIM-DIGI-RAW "
     f"--eventcontent FEVTDEBUG --geometry {geometry} --era {era} "
     f"--relval 9000,100 --fileout {output_dir}/step1.root --nThreads {num_threads} "
     f"--customise SLHCUpgradeSimulations/Configuration/aging.customise_aging_1000 "
     f"--python_filename {ttbar_config_file}"
 )
 
 if not args.cachedInput and not args.dryRun:
     print("Running TTbar GEN,SIM step...")
     run_command(ttbar_command, log_file=os.path.join(output_dir, "ttbar_gen_sim.log"))
 
 # Directory containing HLT test configurations
 hlt_configs_dir = output_dir
 
 # Check if the directory exists
 if not os.path.exists(hlt_configs_dir):
     print(f"Directory {hlt_configs_dir} not found! Exiting...")
     exit(1)
 
 # Step 7: Function to run cmsRun on a given HLT config file and save the output
 def run_cmsrun(config_file):
     # Extract the HLT path name from the config file (e.g., "Phase2_HLT_IsoMu24_FromL1TkMuon.py")
     base_name = os.path.basename(config_file).replace("Phase2_", "").replace(".py", "")
     log_file = os.path.join(output_dir, f"{base_name}.log")
     
     # Run the cmsRun command and log the output
     cmsrun_command = f"cmsRun {config_file}"
     result_code = run_command(cmsrun_command, log_file=log_file)
 
     if result_code != 0:
         print(f"cmsRun failed for {config_file} with exit code {result_code}. Check {log_file} for details.")
         return result_code  # Return the error code
 
     print(f"cmsRun completed for {config_file}")
     return 0  # Return 0 for success
     
 # Step 8: Loop through all files in hlt_test_configs and run cmsRun on each in parallel
 config_files = [
     f for f in os.listdir(hlt_configs_dir)
     if f.endswith(".py") and f.startswith("Phase2_") and f != "Phase2_dump.py"
 ]
 print(f"Found {len(config_files)} configuration files in {hlt_configs_dir}.")
 
 ##### stop here in case it's dryRun mode
 if args.dryRun:  # Check if the --dryRun flag is active
     print("Dry run mode activated. All configurations have been created.")
     exit(0)
 
 # Run cmsRun on all config files in parallel and handle errors
 error_occurred = False
 with ThreadPoolExecutor(max_workers=num_parallel_jobs) as executor:
     futures = {executor.submit(run_cmsrun, os.path.join(output_dir, config_file)): config_file for config_file in config_files}
 
     for future in as_completed(futures):
         config_file = futures[future]
         try:
             result_code = future.result()
             if result_code != 0:
                 error_occurred = True
                 print(f"cmsRun for {config_file} exited with code {result_code}")
         except Exception as exc:
             error_occurred = True
             print(f"cmsRun for {config_file} generated an exception: {exc}")
 
 if error_occurred:
     print("-" * 40)
     print("One or more cmsRun jobs failed. Exiting with failure.")
     print("-" * 40)
     exit(1)
 
 print("All cmsRun jobs submitted.")
 
 # Step 9: Compare all HLT root files using hltDiff
 def compare_hlt_results(input_dir, num_events, max_workers=4):
     # List all root files starting with "HLT_" or "L1T_" in the output directory
     root_files = [f for f in os.listdir(input_dir) if f.endswith(".root") and (f.startswith("HLT_") or f.startswith("L1T_"))]
 
     # Base file (hltrun output) to compare against
     base_root_file = os.path.join(input_dir, "hlt.root")
 
     # Check if base_root_file exists
     if not os.path.exists(base_root_file):
         print(f"Base root file {base_root_file} not found! Exiting...")
         exit(1)
 
     # Use ThreadPoolExecutor to run comparisons in parallel
     with ThreadPoolExecutor(max_workers=max_workers) as executor:
         futures = []
         for root_file in root_files:
             futures.append(executor.submit(compare_single_file, root_file, base_root_file, num_events, input_dir))
 
         # Collect results as they complete
         for future in as_completed(futures):
             result = future.result()
             if result:  # If there is an error message, print it and exit
                 print("-" * 40)
                 print(result)
                 print("-" * 40)
                 exit(1)
 
     print("All HLT comparisons passed with no differences.")
 
 # Step 10: Once all cmsRun jobs are completed, perform the hltDiff comparisons
 print("Performing HLT result comparisons...")
 compare_hlt_results(output_dir,num_events,num_parallel_jobs)  # Adjust max_workers based on your CPU cores
 
 # Step 11: Capture the end time and print the end timestamp
 end_time = time.time()
 end_timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
 print("------------------------------------------------------------")
 print(f"Script ended at {end_timestamp}")
 print("------------------------------------------------------------")
 
 # Step 12: Calculate the total execution time and print it
 total_time = end_time - start_time
 formatted_total_time = time.strftime("%H:%M:%S", time.gmtime(total_time))
 print("------------------------------------------------------------")
 print(f"Total execution time: {formatted_total_time}")
 print("------------------------------------------------------------")
 
 print("All steps completed successfully.")

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