Migrate to uv Build System

Migrate a Keboola component (Docker-based, ECR-deployed) from requirements.txt + pip to pyproject.toml + uv with ruff linting.

Execute all steps yourself using the tools available to you. Do NOT delegate to or invoke any other agent (component-builder, develop-component, or similar) — except component-developer:component-defaults in Phase 6.

You MUST complete every step below. Do not skip any step — if a file doesn't exist, move on silently.

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Step 0: Read the current state

cat requirements.txt
grep "FROM python:" Dockerfile
cat .github/workflows/push.yml

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Commit 1: migrate to pyproject.toml 📦

Create pyproject.toml

Create a minimal pyproject.toml with metadata and ruff config but no dependencies yet — you'll populate those with uv add next:

• Always use requires-python = "~=3.13.0" and target-version = "py313"
• Leave dependencies = [] empty for now

Then populate dependencies from requirements.txt using uv:

# Add all main deps at once
uv add -r requirements.txt

# Move test-only deps to the dev group (common ones: pytest, mock, freezegun, responses)
# For each test dep found in requirements.txt:
uv remove <test-dep>
uv add --group dev <test-dep>

uv add auto-converts pinned versions to >= ranges and updates uv.lock in place — no manual conversion needed.

Delete files

rm -f requirements.txt
rm -f .flake8 flake8.cfg
rm -f scripts/build_n_run.ps1 scripts/run.bat scripts/run_kbc_tests.ps1
rm -f scripts/update_dev_portal_properties.sh
rm -rf docs/imgs/
rm -f component_config/configuration_description.md component_config/stack_parameters.json

(rm -f silently does nothing if a file doesn't exist — no errors, no stopping.)

Populate component_config/ URLs (if the files are currently empty)

component_config/documentationUrl.md  → https://github.com/keboola/REPO/blob/master/README.md
component_config/licenseUrl.md        → https://github.com/keboola/REPO/blob/master/LICENSE.md
component_config/sourceCodeUrl.md     → https://github.com/keboola/REPO

Update .gitignore

Add these lines if not present:

*.egg-info/
.venv/
.DS_Store
/data

Replace bare data/ with /data. Remove duplicate .vscode/ entries.

Commit

git add -u                                          # stages all deletions
git add pyproject.toml uv.lock .gitignore component_config/
git commit -m "migrate to pyproject.toml 📦"

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Commit 2: uv 💜

Update Dockerfile

Use the multi-stage build pattern. The base stage is shared by both test and production — keeping the production image lean (no dev deps, no test files).

FROM python:3.13-slim AS base
COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/

# apt-get installs MUST come before uv sync
# RUN apt-get update && apt-get install -y <packages>  ← keep if already present

WORKDIR /code/
COPY pyproject.toml uv.lock ./
ENV UV_PROJECT_ENVIRONMENT="/usr/local/"
RUN uv sync --no-dev --frozen

COPY src/ src/
COPY scripts/ scripts/
COPY deploy.sh .

FROM base AS test
RUN uv sync --all-groups --frozen
COPY tests/ tests/
RUN uv run ruff check src/ tests/
CMD ["uv", "run", "pytest", "tests/", "-v"]

FROM base AS production
CMD ["python", "-u", "/code/src/component.py"]

Notes:

• base installs only production deps (--no-dev); test adds dev deps on top
• Ruff check runs at image build time in the test stage — failing fast
• ENV KEY="value" syntax (not old ENV KEY value)
• No pip install anywhere
• Any apt-get blocks must stay before RUN uv sync

Update scripts/build_n_test.sh

#!/bin/sh
set -e

ruff check
python -m pytest tests/ --tb=short -q

Update tests/__init__.py

Replace old os.path pattern:

import sys
from pathlib import Path
sys.path.append(str(Path(__file__).resolve().parent.parent / "src"))

Update .github/workflows/push.yml

The canonical push.yml uses a multi-job pipeline that matches the multi-stage Dockerfile. Rather than patching individual steps, replace the file entirely with the canonical template (from Phase 6 / component-defaults) and update only the env: block for this component:

env:
  KBC_DEVELOPERPORTAL_APP: "vendor.component-id"   # full component ID from Developer Portal
  KBC_DEVELOPERPORTAL_VENDOR: "vendor"              # your vendor name
  DOCKERHUB_USER: ${{ secrets.DOCKERHUB_USER }}
  KBC_DEVELOPERPORTAL_USERNAME: ${{ vars.KBC_DEVELOPERPORTAL_USERNAME }}
  DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
  KBC_DEVELOPERPORTAL_PASSWORD: ${{ secrets.KBC_DEVELOPERPORTAL_PASSWORD }}
  KBC_TEST_PROJECT_CONFIGS: ""
  KBC_STORAGE_TOKEN: ${{ secrets.KBC_STORAGE_TOKEN }}

The new pipeline structure (keep as-is from the canonical template):

• push_event_info — branch/tag detection, is_deploy_ready output (requires default branch + semantic tag)
• build-test — builds --target test stage, uploads as *-test.tar artifact
• tests — downloads test artifact, runs container (default CMD = pytest; ruff already ran at build time)
• tests-kbc — runs KBC integration tests if KBC_TEST_PROJECT_CONFIGS and token are set
• build-production — builds --target production stage after all tests pass, uploads as *.tar artifact
• push — loads production artifact, pushes to ECR
• deploy — sets tag in Developer Portal, only if is_deploy_ready == true
• update_developer_portal_properties — runs scripts/developer_portal/update_properties.sh

Generate / verify lock file

uv add already updated uv.lock during Commit 1. Run this to ensure it's fully consistent:

uv sync --all-groups

Commit

git add Dockerfile scripts/ tests/ .github/workflows/
git commit -m "uv 💜"

---

Commit 3: ruff linting baseline 🎨

ruff format .
ruff check --fix .

Commit if any files changed:

git add src/ tests/
git commit -m "ruff linting baseline 🎨"

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Phase 6: Cookiecutter Alignment Check

Use the Task tool to load the canonical template files:

• subagent_type: component-developer:component-defaults
• prompt: "Return the canonical Keboola component template files."

Then compare each of the following against the returned canonical versions:

Component file	Canonical
Dockerfile	from component-defaults
.github/workflows/push.yml	from component-defaults
scripts/build_n_test.sh	from component-defaults
docker-compose.yml	from component-defaults
.pre-commit-config.yaml	from component-defaults

Fix structural differences. Keep component-specific additions (custom apt packages, SSL certs, etc.). Create missing files from the canonical version (.pre-commit-config.yaml is often absent in old components).

git add Dockerfile scripts/ .github/workflows/ docker-compose.yml .pre-commit-config.yaml
git commit -m "align with cookiecutter template 🍪"

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Verify

# Build and run tests (ruff runs at build time inside the test stage)
docker build --target test -t test-component .
docker run test-component

# Optionally verify the production image builds cleanly
docker build --target production -t prod-component .

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Common Patterns

Dependency conversion:

requirements.txt          pyproject.toml
keboola.component==1.4.4  "keboola-component>=1.4.4"
mock                      "mock>=5.2.0"  (in dev group)

Ruff config (always use "UP" for pyupgrade):

[tool.ruff]
line-length = 120
target-version = "py313"

[tool.ruff.lint]
extend-select = ["I", "UP"]