What is the correct layout of Python code when using --symlink-install in ROS 2?

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Hi all,

I'm trying to write a Python node in ROS 2. Here is my package directory layout (assume pkgname is my ROS package's name):

pkgroot/
+-- scripts/
    +-- node.py
+-- src/
    +-- pkgname/
        +-- src.py
+-- setup.py
+-- setup.cfg
+-- package.xml

This directory is put under workspace/src/.

My setup.py is as follows:

from setuptools import setup, find_packages
package_name = "pkgname"
setup(
    name=package_name,
    version="0.0.1",
    packages=find_packages("src"),
    package_dir={"": "src"},
    scripts=["scripts/node.py"],
    zip_safe=True
)

colcon build works normally as usual. But when I'm trying to use the --symlink-install option, colcon tells me:

error: error in 'egg_base' option: 'src' does not exist or is not a directory

After inspecting the build directory, I found that colcon created a symlink to workspace/src/pkgroot/pkgname instead of workspace/src/pkgroot/src/pkgname.

Since I want to separate scripts and src directory, I don't want to put the actual Python module code (pkgroot/src/pkgname) directly under my package root (pkgroot/pkgname).

Any suggestions? Thanks!