Building Docker causes error

[rowild]

I run docker build . -t openmvg, but it always throws an error:

➜  openMVG-2.0 docker build . -t openmvg
[+] Building 2.3s (8/10)                                                                          docker:desktop-linux
 => [internal] load .dockerignore                                                                                 0.0s
 => => transferring context: 2B                                                                                   0.0s
 => [internal] load build definition from Dockerfile                                                              0.0s
 => => transferring dockerfile: 1.15kB                                                                            0.0s
 => [internal] load metadata for docker.io/library/ubuntu:bionic                                                  2.1s
 => [1/6] FROM docker.io/library/ubuntu:bionic@sha256:152dc042452c496007f07ca9127571cb9c29697f42acbfad72324b2bb2  0.0s
 => [internal] load build context                                                                                 0.1s
 => => transferring context: 195.67kB                                                                             0.1s
 => CACHED [2/6] RUN apt-get update && apt-get install -y   cmake   build-essential   graphviz   git   coinor-li  0.0s
 => CACHED [3/6] ADD . /opt/openMVG                                                                               0.0s
 => ERROR [4/6] RUN cd /opt/openMVG && git submodule update --init --recursive                                    0.1s
------                                                                                                                 
 > [4/6] RUN cd /opt/openMVG && git submodule update --init --recursive:
0.089 fatal: not a git repository (or any of the parent directories): .git
------
Dockerfile:25
--------------------
  23 |     # Clone the openvMVG repo
  24 |     ADD . /opt/openMVG
  25 | >>> RUN cd /opt/openMVG && git submodule update --init --recursive
  26 |     
  27 |     # Build
--------------------
ERROR: failed to solve: process "/bin/sh -c cd /opt/openMVG && git submodule update --init --recursive" did not complete successfully: exit code: 128

It seems Docker is again cloning the openMVG repo into /opt/openMVG – why? It is already cloned.
What can I do to get rid of this error?

I am on a Macbook Pro M2, macOS 13.6

[pmoulon]

Can you share in which folder are you?
You should run this in a git clone

[rowild]

Thank you, @pmoulon , for your quick responses! Very much appreciated!

So from what I understand from your previous comment I should first git clone --recursive [the-repo] – --recursive being the keyword here. Because previously I did NOT use --recursive.

OK. I ran git clone --recursive [repo] and then changed into that openMVG folder in order to runt he Docker command.
However, I still get an error, which you can see in the attached text file.

What I am still wondering about is: why does the docker solution try to install something into the local /opt folder? It is a Docker app and IMO shouldn't do that. (BTW: It does not, and that seems to be the reason why the error happens; I have a feeling that I should run the command as sudo – but, honestly, I do not want Docker to install anything outside of its container.)

openmvg_docker_setup_error.txt