Configuration

l0-git can be configured via a .l0git.json file in the project root. This file allows you to ignore specific gates, override their severity, and pass gate-specific options.

Schema

The configuration file is a JSON object with three primary top-level fields:

Field	Type	Description
ignore	string[]	List of gate IDs to skip entirely.
severity	Record<string, string>	Override the default severity for specific gates (error, warning, info).
gate_options	Record<string, object>	Per-gate options (e.g., exclude_paths, threshold_mb).

Example

{
  "ignore": ["changelog_present", "pr_template_present"],
  "severity": {
    "readme_present": "info",
    "secrets_scan": "warning"
  },
  "gate_options": {
    "large_file_tracked": { 
      "threshold_mb": 10, 
      "exclude_paths": ["dist/**"] 
    },
    "secrets_scan": { 
      "exclude_paths": ["test/fixtures/**"] 
    },
    "secrets_scan_history": { 
      "enabled": true, 
      "max_blobs": 10000 
    }
  }
}

Inline Overrides

For language-specific gates (Dockerfile, Compose, HTML, Markdown, CSS), you can use inline comments to ignore a rule for a specific line or block.

Dockerfile

# l0git: ignore from_latest reason: dev base image
FROM node:latest

Docker Compose

services:
  proxy:
    image: traefik:v3
    # l0git: ignore docker_socket_mount reason: required for routing
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"

HTML

<!-- l0git: ignore viewport_no_zoom reason: legacy app requirement -->
<meta name="viewport" content="width=device-width, user-scalable=no">

Markdown

<!-- l0git: ignore image_no_alt reason: decorative image -->
![](./logo.png)

CSS

/* l0git: ignore thin_font_weight reason: brand identity */
body {
  font-weight: 100;
}

Scan options

Every gate that reads file contents accepts the same three options, on top of its own. They exist because a scanner that cannot be told where not to look becomes noise, and noise gets switched off entirely.

Option	Default	What it does
exclude_paths	[]	Glob patterns (filepath.Match semantics) matched against the path relative to the project root. A match is skipped before the file is read.
skip_default_fixture_paths	true	Skip well-known test and fixture locations.
skip_default_data_files	true	Skip tabular and line-oriented data files.

Why fixtures are skipped by default

Test fixtures legitimately contain mock secrets, fake IP addresses and placeholder URLs: that is what makes them fixtures. Scanning them produces findings that are correct about the bytes and wrong about the meaning.

Covered: *_test.go, test_*.py / *_test.py, *.test.{ts,tsx,js,jsx}, *.spec.{ts,tsx,js,jsx}, *_test.rs, *Test.{java,kt}, *_spec.rb, *_test.rb, conftest.py, plus any path traversing test/, tests/, __tests__/, spec/, testdata/, fixtures/ or __fixtures__/.

Set it to false to scan them anyway:

{
  "gate_options": {
    "secrets_scan": { "skip_default_fixture_paths": false }
  }
}

Why data files are skipped by default

In a .csv of network ranges or a .jsonl of records, the addresses and keys are the payload of the file, not literals embedded in source. Covered: .csv, .tsv, .jsonl, .ndjson, .parquet, .arrow, .feather.

This applies to content-scanning gates only. Metadata gates, large_file_tracked, vendored_dir_tracked and friends, still see these files, because for them the size and the path are the point.

Some gates additionally detect address lists by content: network_scan treats a .txt whose lines are overwhelmingly bare IP or CIDR literals as a data file and gates that on this same flag.

Where the config is read from

.l0git.json is read from the project root you pass to lgit check. There is no user-level or global config file, and no merging: one project, one file.

An unparseable .l0git.json is itself reported, by the config parse error gate.

A typo is reported, not absorbed

Every key is validated: the top-level fields, and each gate_options sub-tree against the gate that owns it. Unknown keys and wrong types are both rejected:

{ "gate_options": { "large_file_tracked": { "treshold_mb": 20 } } }

warning: gate_options.large_file_tracked: json: unknown field "treshold_mb"

The warning goes to stderr, and the same text appears in the config_error field of lgit check's JSON. This matters because the failure it replaces was invisible: a mistyped option key used to be discarded and the gate ran on its defaults, so "threshold_mb": "20" quietly stayed 5 and "exclude_path" excluded nothing, with no error, no warning, and exit 0.

A bad key discards more than itself

A problem in the top level (ignore, severity, gate_options) means the whole file fails to parse, so none of your configuration applies, not just the offending key. A problem inside one gate_options sub-tree is contained: only that gate falls back to its defaults.

Either way the run continues and the exit code stays 0. A broken config should not take a whole CI job with it, but it should never be silent, so check stderr, or config_error, if a setting seems not to be taking effect.