install exiftool in pipeline runner

.gitea/workflows/ci.yml

@@ -18,6 +18,15 @@ jobs:
         run: uv sync --frozen
       - name: copy env
         run: cp .env.template .env
+      - name: Install exiftool (system dependency)
+        run: |
+          if command -v exiftool >/dev/null 2>&1; then
+            echo "exiftool already installed"
+          elif command -v sudo >/dev/null 2>&1; then
+            sudo apt-get update && sudo apt-get install -y --no-install-recommends libimage-exiftool-perl
+          else
+            apt-get update && apt-get install -y --no-install-recommends libimage-exiftool-perl
+          fi
       - name: Run pytest
         run: uv run pytest .
       - name: Check formatting (black)

AGENTS.md

@@ -6,6 +6,11 @@ Requires a `.env` file with the following variables:
 - `llm_api_base_url`: Base URL for the LLM API.
 - `llm_default_temperature`: Float value for temperature.
 
+## System Dependencies
+- `exiftool` binary: required by `pyexiftool` at runtime, not installable via pip/uv.
+  - Arch: `perl-image-exiftool`
+  - Debian/Ubuntu: `libimage-exiftool-perl`
+
 ## Development Toolchain
 - **Dependency Management**: Use `uv`.
 - **Python Version**: Requires Python `>=3.14`.

src/photools3/metadata_writer.py

@@ -44,7 +44,6 @@ def read_metadata(path: Path) -> XmpMetadata | None:
         log.error(f"Could not read metadata from {path}: {exc}")
 
 
-
 class MetadataWriter:
     """
     Write metadata (captions and keywords) to image files.

test/test_metadata_writer.py

@@ -1,4 +1,3 @@
-
 from photools3.metadata_writer import read_metadata
 from test.test_photo import PATHS_DNG_EXAMPLES