Unnecessary full git history checkout
=====================================

.. list-table::
   :stub-columns: 1
   :widths: 20 80

   * - Rule ID
     - ``unnecessary_full_checkout``
   * - Category
     - performance
   * - Severity
     - low

fetch-depth: 0 is used but no git history analysis (changelog generation, git log, blame) is present in the workflow.

Detection
---------

``pattern_matching`` — Regex or keyword matching on string field values.

Examples
--------

**Non-compliant:**

.. code-block:: yaml

   jobs:
     build:
       steps:
         - uses: actions/checkout@v4
           with:
             fetch-depth: 0
         - run: npm ci && npm run build

**Compliant:**

.. code-block:: yaml

   jobs:
     build:
       steps:
         - uses: actions/checkout@v4
         - run: npm ci && npm run build

**Fix**: Remove fetch-depth: 0 unless the job needs full git history (changelog generation, git log, semantic-release). Shallow clones are significantly faster.