The execution results of dmypy are not as expected

[WutingjiaX]

Operation steps

1. I start a daemon server

    command = [
        'dmypy', '--status-file', status_file_name, 'start', '--log-file', mypy_server_log_name,
        '--', '--show-column-numbers', '--show-error-end'
    ]
    process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = process.communicate()

2. use command line to check

dmypy --status-file xxxx.json check -v xxx.py

It can output the correct result

3. use python to write file,and use command line to check again

with open(path, 'w') as file:
    file.write(content)

It can not output any issue,like:

Success: no issues found in 1 source file
err                     : 
out                     : Success: no issues found in 1 source file\n
platform                :     darwin
python_version          :       3_11
roundtrip_time          :      1.148
stats                   : {'find_module_time': 0.006188869476318359, 'find_module_calls': 673, 'update_isolated_time': 0.0071163177490234375, 'propagate_time': 1.1365551948547363, 'find_changes_time': 0.00043392181396484375, 'fg_update_time': 6.198883056640625e-06, 'refresh_suppressed_time': 0.0006737709045410156, 'find_added_supressed_time': 0.0018012523651123047, 'cleanup_time': 1.1443119049072266}
status   

4. BUT if I use mypy instead of dmypy，It can output correct result：

mypy xxx.py

Found 8 errors in 6 files (checked 1 source file)
err                     : 
out                     : c8f34f1c-8173-4437-b07f-8d7f8c7f7210/FLO ... 1725 more characters
platform                :     darwin
python_version          :       3_11
roundtrip_time          :      0.160
stats                   : {'validate_meta_time': 8.96453857421875e-05, 'files_parsed': 34, 'modules_parsed': 22, 'stubs_parsed': 12, 'parse_time': 0.01146078109741211, 'find_module_time': 0.01342916488647461, 'find_module_calls': 3688, 'semanal_time': 0.018131256103515625, 'typecheck_time': 0.014755964279174805, 'finish_passes_time': 0.007950305938720703, 'load_fg_deps_time': 1.5020370483398438e-05, 'update_isolated_time': 0.1284799575805664, 'propagate_time': 0.02331995964050293, 'find_changes_time': 0.0006420612335205078, 'fg_update_time': 0.1564321517944336, 'refresh_suppressed_time': 0.0005068778991699219, 'find_added_supressed_time': 0.0013458728790283203, 'cleanup_time': 0.0001461505889892578}
status                  :          1

5. If I manually change the python file slightly，the dmypy can ouput correct result again

Your Environment

• Mypy version used: 1.10.1

Is there anything special about the caching logic of this dmypy? Will all information be lost if the file is regenerated?

[kkpattern]

we encountered the exact same bug.

[kkpattern]

Seems this is the root cause. After changed the parameter from absolute path to relative path dmypy now works correctly for us.