Uninstall one Python version removes packages from other Python versions

[cdeil (Christoph Deil)]

I think there might be a bug in Macports (or misunderstanding how it works). I had multiple Python versions installed and

sudo port uninstall --follow-dependents python34

didn't remove python34 and all Python 3.4 packages like I want, it started uninstalling Python 2.7, 3.5 and 3.6 packages. I asked about this here ​https://stackoverflow.com/questions/45721014/macports-uninstall-only-one-python-version

Following the advice of ​https://stackoverflow.com/a/45722973/498873 I tried the -y option to do a dry run first. This does list exactly what I wanted to uninstall, but then removing the -y Macports started to uninstall packages I didn't want to uninstall from other Python versions. The comments after that answer contain more details, and specifically this example of the bahaviour I get: ​https://gist.github.com/cdeil/dc6dd1029964542c6365c2fdde21e776

Bug or feature?

[mf2k (Frank Schima)]

What version of base are you running?

$ port version

[cdeil (Christoph Deil)]

$ port version
Version: 2.4.1

[jmroot (Joshua Root)]

The issue may have been that this loop assumes that the identifiers refer to the same registry entries across the uninstall operation which potentially deletes and opens multiple entries: ​https://github.com/macports/macports-base/blob/v2.4.1/src/registry2.0/portuninstall.tcl#L203

That assumption should actually hold after [fc212a0b550ed961d07c261c715ca83580deac56/macports-base], so this may have been fixed incidentally.

[jmroot (Joshua Root)]

#52303