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Improve Python install path detection #601

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This PR makes the customized Python path scheme logic in colcon contingent on an install prefix other than /usr.

This makes colcon more distribution-friendly and prevents the accidental overwriting of system packages in case someone decides to install their packages to /usr. There is no other change in behavior.

roehling added a commit to roehling/ament_cmake that referenced this pull request Nov 27, 2023
[ This is the companion PR to
colcon/colcon-core#601 ]

This PR makes the customized Python path scheme logic in
ament_cmake_python contingent on an install prefix other than `/usr`.

This makes ament more distribution-friendly and prevents the accidental
overwriting of system packages in case someone decides to install their
Python packages to /usr. There is no other change in behavior.

Signed-off-by: Timo Röhling <roehling@debian.org>
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cottsay commented Feb 5, 2024

(Discussion on how to move forward with this change is ongoing in ament/ament_cmake#496)

roehling added a commit to roehling/ament_cmake that referenced this pull request Feb 21, 2024
[ This is the companion PR to
colcon/colcon-core#601 ]

This PR makes the customized Python path scheme logic in
ament_cmake_python contingent on an install prefix other than `/usr`.

This makes ament more distribution-friendly and prevents the accidental
overwriting of system packages in case someone decides to install their
Python packages to /usr. There is no other change in behavior.

Signed-off-by: Timo Röhling <roehling@debian.org>
This PR makes the customized Python path scheme logic in colcon
contingent on an install prefix other than `/usr`.

This makes colcon more distribution-friendly and prevents the accidental
overwriting of system packages in case someone decides to install their
packages to `/usr`. There is no other change in behavior.

Signed-off-by: Timo Röhling <roehling@debian.org>
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