Use mount -a to mount a zip file when building docker image

Image Builds
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1

I’m trying to build a docker image for https://openfreemap.org/ which is using hard linked files. I was hoping to be able to use the naive approach to simply run the init script in a Dockerfile. The init script is mounting a zip file by the following entry in /etc/fstab

data/ofm/http_host/runs/monaco/20250720_231000_pt/tiles.btrfs /mnt/ofm/monaco-20250720_231000_pt btrfs loop,ro 0 0

The file tils.btrfs and the mount path exists, but the “mount -a” command fails with the following error:

mount: /mnt/ofm/monaco-20250720_231000_pt: mount failed: No such file or directory.

I’ve also tried to log into an ubuntu container an run the script and get the same error.

Here is a Dockerfile that reproduces the error when built

# Run with docker build --file ./Dockerfile .
FROM ubuntu:latest

RUN apt update && apt install -y \
sudo \
git \
python3-pip \
python3.12-venv \
openssh-server
# setting up ssh
RUN ssh-keygen -t ed25519 -C "your_email@example.com" -f /root/.ssh/id_ed25519 -N ""
RUN cp /root/.ssh/id_ed25519.pub ~/.ssh/authorized_keys
RUN /etc/init.d/ssh start
# setting up code
WORKDIR /checkout
RUN git clone https://github.com/hyperknot/openfreemap
WORKDIR /checkout/openfreemap
COPY config/env.sample /checkout/openfreemap/config/.env

RUN python3 -m venv py_envs
RUN . /checkout/openfreemap/py_envs/bin/activate && pip install -e .
# THE FAILING LINE IS init-server.py
RUN . /checkout/openfreemap/py_envs/bin/activate && /etc/init.d/ssh start && ./init-server.py http-host-static 127.0.0.1 -y

 CMD ["echo", "Hello, World!"]
3

Hello!
I am having the same issue. Appreciate if anyone knows the solution.

5

It feels like you are trying to mount a file from the host when you are inside the container. If you want to mount a file, you need to use a bind mount

For compose

Search for bind

When you build an image, you still have a container running the instructions.

You can search for “–mount” here. And either you mount a file or copy, but a simople mount command will not work as it will see only the files inside the container.

6

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