python setup_helper ignores --install-base flag
@christophfroehlich is already working on this.
Since Apr 17, 2026.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 25/100
- Issue type
- Bug
- Clarity
- Clearly specified
- Activity status
- Stale
- Tech stack
- python
- Domain
- build-system
Research direction
Start by reading setup_helper.generate_parameter_module and how it handles --build-base; reproduce the issue with the colcon build --merge-install --install-base=/opt/alt-install-path-v0 command from the report. Done means the generated Python parameter module is placed under the selected install base rather than the workspace's default install/ path. A linked open pull request means this work may already be underway.
Written by the indexing model from the issue text.
Description
While setup_helper.generate_parameter_module parses args and respects --build-base, it assumes the default 'install' path and ignores the --install-base argument.
For example:
colcon build --merge-install --install-base=/opt/alt-install-path-v0
Results in the ROS python package being installed to:
/opt/alt-install-path-v0/lib/python3.10/site-packages/foo/...
But the generated code gets left behind all by itself in the workspace
$ tree install/
install/
└── foo
└── lib
└── python3.10
└── site-packages
└── foo
├── foo_parameters.py
I believe this is different but related to the churn and discussion of similar issues in #207 #236 #237
- Dominant language
- Python
- Stars
- 385
- Forks
- 81
- PR merge metrics
- No merged PRs in 30d
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