Can not use gradio.File inside Docker container

[PashaWNN]

Describe the bug

Can not find the uploaded file while Gradio is in Docker container.
While I run it without docker (just python3 gradio.py), it is working OK.

Have you searched existing issues? 🔎

• I have searched and found no existing issues

Reproduction

1. Create app.py and Dockerfile with the following code:

import tempfile
import gradio

temporary_directory = tempfile.TemporaryDirectory()


def run_app(test_filename):
    out_file = tempfile.NamedTemporaryFile(dir=temporary_directory.name, mode='w')
    with open(test_filename, 'r') as test_file:
        out_file.write(test_file.read())
        out_file.flush()
    return out_file.name


iface = gradio.Interface(
    fn=run_app,
    inputs=[
        gradio.File(label='Test file', file_types=['.txt'], type='filepath'),
    ],
    outputs=[gradio.File()],
    allow_flagging='never',
).launch()

FROM python:3.10-slim

RUN apt-get update

RUN apt-get -y full-upgrade

RUN apt-get install -y --no-install-recommends \
	libcairo2 libdouble-conversion3 libxml2 lib3mf1 libzip4 libharfbuzz0b \
	libboost-thread1.74.0 libboost-program-options1.74.0 libboost-filesystem1.74.0 \
	libboost-regex1.74.0 libmpfr6 libqscintilla2-qt5-15 \
	libqt5multimedia5 libqt5concurrent5 libtbb12 libglu1-mesa \
	libglew2.2 xvfb xauth

RUN apt-get clean


WORKDIR /usr/src/app
RUN mkdir /tmp/gradio
RUN pip install --no-cache-dir gradio
COPY . .
RUN pip install -r requirements.txt
EXPOSE 7860
ENV GRADIO_SERVER_NAME="0.0.0.0"
ENV GRADIO_TEMP_DIR="/tmp/gradio"

CMD ["python", "app.py"]

2. Run it (docker build -t gradio-app . && docker run -p 7860:7860 gradio-app) and try to upload the file

Screenshot

No response

Logs

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/gradio/queueing.py", line 532, in process_events
    response = await route_utils.call_process_api(
  File "/usr/local/lib/python3.10/site-packages/gradio/route_utils.py", line 276, in call_process_api
    output = await app.get_blocks().process_api(
  File "/usr/local/lib/python3.10/site-packages/gradio/blocks.py", line 1938, in process_api
    data = await self.postprocess_data(block_fn, result["prediction"], state)
  File "/usr/local/lib/python3.10/site-packages/gradio/blocks.py", line 1761, in postprocess_data
    prediction_value = block.postprocess(prediction_value)
  File "/usr/local/lib/python3.10/site-packages/gradio/components/file.py", line 193, in postprocess
    size=Path(value).stat().st_size,
  File "/usr/local/lib/python3.10/pathlib.py", line 1097, in stat
    return self._accessor.stat(self, follow_symlinks=follow_symlinks)
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmp52s9_i2i/tmpq0guqj89'

### System Info

```shell
MacOS 14.5, MacBook Pro M1 2020.

Env inside Docker container:

Gradio Environment Information:
------------------------------
Operating System: Linux
gradio version: 4.36.1
gradio_client version: 1.0.1

------------------------------------------------
gradio dependencies in your environment:

aiofiles: 23.2.1
altair: 5.3.0
fastapi: 0.111.0
ffmpy: 0.3.2
gradio-client==1.0.1 is not installed.
httpx: 0.27.0
huggingface-hub: 0.23.4
importlib-resources: 6.4.0
jinja2: 3.1.4
markupsafe: 2.1.5
matplotlib: 3.9.0
numpy: 2.0.0
orjson: 3.10.5
packaging: 23.2
pandas: 2.2.2
pillow: 10.3.0
pydantic: 2.7.4
pydub: 0.25.1
python-multipart: 0.0.9
pyyaml: 6.0.1
ruff: 0.4.10
semantic-version: 2.10.0
tomlkit==0.12.0 is not installed.
typer: 0.12.3
typing-extensions: 4.12.2
urllib3: 2.2.2
uvicorn: 0.30.1
authlib; extra == 'oauth' is not installed.
itsdangerous; extra == 'oauth' is not installed.


gradio_client dependencies in your environment:

fsspec: 2024.6.0
httpx: 0.27.0
huggingface-hub: 0.23.4
packaging: 23.2
typing-extensions: 4.12.2
websockets: 11.0.3

### Severity

Blocking usage of gradio

[PashaWNN]

What I've found out so far:

1. The error is not platform-specific: same happens with Gradio deployment on HuggingFaces
2. The error is not version specific: there are examples on the Internet, where gr.File is used with the same Gradio version
3. If you change the GRADIO_TEMP_DIR to somewhat outside /tmp directory — everything is working OK

[freddyaboulton]

Hi @PashaWNN . You need to set delete=False in the NamedTemporaryFile otherwise it will be deleted as soon as it's closed.

[PashaWNN]

Hi, just checked that and you're right, my bad.