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pallets-flask

SUCCESS

17m 01s

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Summary Iterations2 Transcript25 Dockerfile

01Iteration 1

WRITEWriteFile· step #1

Dockerfile825 bytes written

▸text29 lines · 825 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml .
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local

WORKDIR /app

RUN mkdir -p /app

RUN bash -lc 'cat > /app/app.py << "PY"\nfrom flask import Flask\n\napp = Flask(__name__)\n\n@app.route("/")\ndef hello():\n    return "Hello from Flask container built from source!"\n\nif __name__ == "__main__":\n    app.run(host="0.0.0.0", port=5000)\nPY'

EXPOSE 5000
CMD ["python","/app/app.py"]

WRITEWriteFile· step #2

.dockerignore169 bytes written

▸dockerignore23 lines · 169 chars

__pycache__/
*.pyc
*.pyo
build/
dist/
*.egg-info/
*.eggs
.eggs
 manic
*.log
*.swp
*.tmp
*.bak
*.zip
*.tar.gz
*.egg
*.egg-info
.DS_Store
*.pytest_cache
.env
venv/
*.venv

VERIFYVerifyBuild· step #3

1m 50s

VerifyBuildbuild_failed

▸Build error

- Exact error message and exit code:
  - flit_core.config.ConfigError: Description file README.md does not exist
  - exit code: 1

- Failing command/step:
  - RUN pip install --no-cache-dir .

- Missing packages or files mentioned:
  - Description file README.md does not exist (FileNotFoundError: 'README.md')
  - This originated during reading PEP 621 metadata for the project (read_flit_config/read_pep621_metadata)

- Version mismatch info:
  - Version number normalised: '3.2.0.dev' -> '3.2.0.dev0' (see PEP 440)

WRITEWriteFile· step #4

Dockerfile860 bytes written

▸text29 lines · 860 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local

WORKDIR /app

RUN mkdir -p /app

RUN bash -lc 'cat > /app/app.py << "PY"\nfrom flask import Flask\n\napp = Flask(__name__)\n\n@app.route("/")\ndef hello():\n    return "Hello from Flask container built from source!"\n\nif __name__ == "__main__":\n    app.run(host="0.0.0.0", port=5000)\nPY'

EXPOSE 5000
CMD ["python","/app/app.py"]

VERIFYVerifyBuild· step #5

1m 32s

VerifyBuildbuild_failed

▸Build error

Summary (under 1500 chars):

- Failing command/step:
  stage-1 5/5 RUN bash -lc 'cat > /app/app.py << "PY"\nfrom flask import Flask\n\napp = Flask(__name__)\n\n@app.route("/")\ndef hello():\n    return "Hello from Flask container built from source!"\n\nif __name__ == "__main__":\n    app.run(host="0.0.0.0", port=5000)\nPY'

- Exact error message and exit code:
  0.282 bash: line 1: warning: here-document at line 1 delimited by end-of-file (wanted `PYnfrom')
  0.282 bash: -c: line 1: syntax error near unexpected token `('
  0.282 bash: -c: 2019-12-01T12:34:56Z  `cat > /app/app.py << "PY"\nfrom flask import Flask\n\napp = Flask(__name__)\n\n@app.route("/")\ndef hello():\n    return "Hello from Flask container built from source!"\n\nif __name__ == "__main__":\n    app.run(host="0.0.0.0", port=5000)\nPY'
  Dockerfile:25
  ERROR: failed to build: failed to solve: process "/bin/sh -c bash -lc 'cat > /app/app.py << \"PY\"\\nfrom flask import Flask\\n\\napp = Flask(__name__)\\n\\n@app.route(\"/\")\\ndef hello():\\n    return \"Hello from Flask container built from source!\"\\n\\nif __name__ == \"__main__\":\\n    app.run(host=\"0.0.0.0\", port=5000)\\nPY'" did not complete successfully: exit code: 2

- Missing packages/files mentioned: None. The error is a syntax issue in the here-document used to create /app/app.py.

- Version mismatch info: None reported. The failing step occurs after Python 3.11-slim base and pip/packaging updates, but no mismatch is indicated in the error.

WRITEWriteFile· step #6

Dockerfile849 chars

▸text40 lines · 849 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local

WORKDIR /app

RUN mkdir -p /app

RUN bash -lc 'cat > /app/app.py << "PY"
from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello from Flask container built from source!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)
PY'

EXPOSE 5000
CMD ["python","/app/app.py"]

WRITEWriteFile· step #7

Dockerfile849 chars

▸text40 lines · 849 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local

WORKDIR /app

RUN mkdir -p /app

RUN bash -lc 'cat > /app/app.py << "PY"
from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello from Flask container built from source!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)
PY'

EXPOSE 5000
CMD ["python","/app/app.py"]

WRITEWriteFile· step #8

Dockerfile850 chars

▸text38 lines · 850 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./ 
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local

WORKDIR /app

RUN mkdir -p /app
RUN bash -lc 'cat > /app/main.py << "PY"
from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello from Flask container built from source!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)
PY'

EXPOSE 5000
CMD ["python","/app/main.py"]

WRITEWriteFile· step #9

example_app.py203 bytes written

▸py11 lines · 203 chars

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "Hello from Flask container built from source!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)

WRITEWriteFile· step #10

Dockerfile892 bytes written

▸text29 lines · 892 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local
WORKDIR /app

RUN mkdir -p /app

# Write a small Flask app directly into the image
RUN printf 'from flask import Flask\n\napp = Flask("app")\n\n@a pp.route("/")\ndef index():\n    return "Hello from Flask container built from source!"\n\nif __name__ == "__main__":\n    app.run(host="0.0.0.0", port=5000)\n' > /app/main.py

EXPOSE 5000
CMD ["python","/app/main.py"]

VERIFYVerifyBuild· step #11

29s

VerifyBuildrejected

Concerns: Inline Flask app written into the final image contains a syntax error: the decorator line is '@a pp.route("/")' with a stray space, making the Python code invalid and preventing the server from starting or py_compile from succeeding., The final stage relies on copying /usr/local from the builder; while common, it can be sensitive to Python packaging layouts and may hide missing dependencies if the build steps fail or differ between images.

WRITEWriteFile· step #12

Dockerfile698 bytes written

▸text29 lines · 698 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local
WORKDIR /app

RUN mkdir -p /app

# A clean, working Flask app using the project as the dependency
COPY example_app.py /app/app.py

EXPOSE 5000
CMD ["python","/app/app.py"]

VERIFYVerifyBuild· step #13

33s

VerifyBuildsmoke_failed

Smoke [PASS]: python /app/app.py & APP_PID=$!; sleep 2; curl -sS http://127.0.0.1:5000/; kill $APP_PID
Smoke [PASS]: test -f /app/app.py
Smoke [FAIL]: python -c "import flask; print(flask.__version__)
  Output: sh: 1: Syntax error: Unterminated quoted string

GREPGrepFiles· step #14

/app.py/inDockerfile1 matches

▸show matches1

No matches found.

GREPGrepFiles· step #15

/app.py/in1 matches

▸show matches1

No matches found.

WRITEWriteFile· step #16

Dockerfile704 bytes written

▸text29 lines · 704 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local
WORKDIR /app

RUN mkdir -p /app

# Copy example application from repo into container as the runtime app
COPY example_app.py /app/app.py

EXPOSE 5000
CMD ["python","/app/app.py"]

VERIFYVerifyBuild· step #17

56s

VerifyBuildsmoke_failed

Concerns: COPY example_app.py /app/app.py may fail if example_app.py does not exist in the repository.
Smoke [PASS]: test -f /app/app.py
Smoke [PASS]: python --version
Smoke [FAIL]: python -c 'print("ok")
  Output: sh: 1: Syntax error: Unterminated quoted string

READReadFile· step #18

example_app.py203 chars · 11 lines

▸py11 lines · 203 chars

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "Hello from Flask container built from source!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)

LISTListDirectory· step #19

.19 entries

▸show entries19

.devcontainer/

.dockerignore

.editorconfig

.git/

.github/

.gitignore

.pre-commit-config.yaml

.readthedocs.yaml

CHANGES.rst

Dockerfile

LICENSE.txt

README.md

docs/

example_app.py

examples/

pyproject.toml

src/

tests/

uv.lock

WRITEWriteFile· step #20

Dockerfile625 bytes written

▸text26 lines · 625 chars

FROM python:3.11-slim AS builder
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential gcc libffi-dev ca-certificates && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY pyproject.toml README.md CHANGES.rst LICENSE.txt ./
COPY src/ src/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir .

FROM python:3.11-slim
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

COPY --from=builder /usr/local /usr/local
WORKDIR /app

COPY example_app.py app.py

EXPOSE 5000
CMD ["python","/app/app.py"]

VERIFYVerifyBuild· step #21

1m 34s

VerifyBuildsmoke_failed

Smoke [PASS]: test -f /app/app.py
Smoke [PASS]: python -V
Smoke [FAIL]: python -c "import sys; print('ok')
  Output: sh: 1: Syntax error: Unterminated quoted string

02Iteration 2

WRITEWriteFile· step #1

Dockerfile665 bytes written

▸text27 lines · 665 chars

FROM python:3.11-slim

# Basic Python environment
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Working directory for the app
WORKDIR /app

# System build tools (safe minimal set)
RUN apt-get update \
    && apt-get install -y --no-install-recommends build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy repository contents and build/install from source
COPY . .

# Ensure latest packaging tools and install the project from source
RUN python -m pip install --upgrade pip setuptools wheel \
    && python -m pip install .

# Expose the default Flask port
EXPOSE 5000

# Run a small demonstration app bundled with the repo
CMD ["python", "app.py"]

WRITEWriteFile· step #2

Dockerfile914 bytes written

▸text30 lines · 914 chars

FROM python:3.11-slim

# Basic Python environment
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Working directory for the app
WORKDIR /app

# System build tools (safe minimal set)
RUN apt-get update \
    && apt-get install -y --no-install-recommends build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy repository contents and build/install from source
COPY . .

# Ensure latest packaging tools and install the project from source
RUN python -m pip install --upgrade pip setuptools wheel \
    && python -m pip install .

# create a tiny app to run
RUN printf '%s\n' 'from flask import Flask' 'app = Flask(__name__)' '@app.route("/")' 'def index():' '    return "Hello from Flask!"' '' 'if __name__ == "__main__":' '    app.run(host="0.0.0.0", port=5000)' > /app/app.py

# Expose the default Flask port
EXPOSE 5000

# Run a small demonstration app bundled with the repo
CMD ["python", "app.py"]

WRITEWriteFile· step #3

./.dockerignore311 bytes written

▸dockerignore29 lines · 311 chars

# Ignore version control and temporary files
.git
__pycache__/
*.pyc
*.pyo
*.pyd
*.swp
.DS_Store
.dist-info/
.eggs/
*.egg-info/
build/
dist/
.vscode/
.vim/
venv/
ENV/
env/
.env
.tox/
.pytest_cache/
.mypy_cache/
ruff_cache/
docs/_build/

# Exclude test assets to keep image small
tests/
examples/**/__pycache__/

VERIFYVerifyBuild· step #4

2m 21s

VerifyBuildaccepted

Concerns: pip install . may fail if the repository does not include packaging metadata (setup.py or pyproject.toml)., COPY . . may copy large or unwanted files; without a .dockerignore, image could be bloated., The RUN step creates/overwrites /app/app.py with a minimal Flask app which could shadow an existing app module in the repo; ensure this doesn’t mask packaging issues.
Smoke [PASS]: test -f /app/app.py
Smoke [PASS]: python -V