python warpper import location? about apriltag HOT 4 CLOSED

I am having a similar problems. I have following the install instructions at https://github.com/AprilRobotics/apriltag#install

If I launch Python from the apriltag directory in which I installed from, then from apriltag import apriltag works fine.

If I try to do this import from my application folder ('/app'; I'm running this in Docker), then it cannot find apriltag. I got an warning during make install that said cp: cannot create regular file '/root/.local/lib/python3.7/site-packages': No such file or directory which is probably related. Everything except the final site-packages folder exists. I did ln -s /usr/local /root/.local to get around this. Re-ran make install and no warning this time.

Now I get a new error when trying to import:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: libapriltag.so.3: cannot open shared object file: No such file or directory

If I copy the /lib directory to my /app directory then the python import works. This isn't very clean and this step isn't in the install documentation, so I do not expect this to be the desired approach.

What should I do here? How is this supposed to work?

Thanks!

Hi, this is not a issue of the code. It's your environment.
just edit the ~/.bashrc add
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
then
source ~/.bashrc
and dont forget
sudo ldconfig
It may solve your problem

from apriltag.

Hi,

The library libapriltag.so.3.1.0 should be installed to your /lib folder after running the instruction for installing apriltag: https://github.com/AprilRobotics/apriltag#install

Does running these commands fix the problem?

from apriltag.

I am having a similar problems. I have following the install instructions at https://github.com/AprilRobotics/apriltag#install

If I launch Python from the apriltag directory in which I installed from, then from apriltag import apriltag works fine.

If I try to do this import from my application folder ('/app'; I'm running this in Docker), then it cannot find apriltag. I got an warning during make install that said cp: cannot create regular file '/root/.local/lib/python3.7/site-packages': No such file or directory which is probably related. Everything except the final site-packages folder exists. I did ln -s /usr/local /root/.local to get around this. Re-ran make install and no warning this time.

Now I get a new error when trying to import:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: libapriltag.so.3: cannot open shared object file: No such file or directory

If I copy the /lib directory to my /app directory then the python import works. This isn't very clean and this step isn't in the install documentation, so I do not expect this to be the desired approach.

What should I do here? How is this supposed to work?

Thanks!

from apriltag.

Hey @cdb0y511,

That environment variable did the trick! I still needed the ln -s /usr/local /root/.local though.

Here is my working dockerfile:

FROM jjanzic/docker-python3-opencv:latest

ENV PYTHONUNBUFFERED 1
ENV PYTHONPATH "${PYTHONPATH}:/app"

# fix "ImportError: libapriltag.so.3: cannot open shared object file: No such file or directory"
# https://github.com/AprilRobotics/apriltag/issues/46
ENV LD_LIBRARY_PATH "/usr/local/lib:${LD_LIBRARY_PATH}"

WORKDIR /app
COPY . /app

RUN pip install --trusted-host pypi.python.org --upgrade pip \
    && pip install --trusted-host pypi.python.org -r requirements.txt \
    && git clone https://github.com/AprilRobotics/apriltag.git /home/apriltag \
    && cd /home/apriltag \
    # fix missing site-packages in /root/.local/lib/python3.7/
    && ln -s /usr/local /root/.local \
    && cmake . \
    && make install

CMD python app/app.py

Ultimately it would be great if I could simply do pip install apriltag and everything would just work. In the meantime, maybe some documentation updates would help other Python users get up and running.

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