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https://github.com/pre-commit/pre-commit.git
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635912514d
pre-commit currently passes selected filenames to hooks via argv.
For large changesets (or --all-files), argv length limits are hit and
filenames are partitioned, causing multiple hook invocations.
This means there is currently no built-in way to pass filenames to an
underlying hook in one shot without chunking / re-running. The only practical
workaround is to set pass_filenames: false and run custom git operations in
hook code to reconstruct the file set, which is expensive and duplicates
pre-commit's own file-selection logic.
This change adds a hook option:
pass_filenames_via_stdin: true
When enabled, pre-commit sends filenames as NUL-delimited bytes on stdin and
runs the hook in a single invocation (no argv chunking).
Why NUL-delimited stdin:
- safe for filenames containing spaces/newlines
- matches established -0 conventions in unix tooling
Usage for hook authors:
- shell:
while IFS= read -r -d '' filename; do
...
done
- python:
data = sys.stdin.buffer.read()
filenames = [os.fsdecode(p) for p in data.split(b'\0') if p]
Behavior notes:
- default remains argv-based passing
- pass_filenames: false still disables filename passing entirely
Implementation includes schema/runtime wiring, shared NUL encode/decode
helpers, and tests covering defaulting and runtime behavior.
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| .. | ||
| commands | ||
| languages | ||
| meta_hooks | ||
| resources | ||
| __init__.py | ||
| __main__.py | ||
| all_languages.py | ||
| clientlib.py | ||
| color.py | ||
| constants.py | ||
| envcontext.py | ||
| error_handler.py | ||
| errors.py | ||
| file_lock.py | ||
| git.py | ||
| hook.py | ||
| lang_base.py | ||
| logging_handler.py | ||
| main.py | ||
| output.py | ||
| parse_shebang.py | ||
| prefix.py | ||
| repository.py | ||
| staged_files_only.py | ||
| store.py | ||
| util.py | ||
| xargs.py | ||
| yaml.py | ||
| yaml_rewrite.py | ||