python plugin doesn't properly handle dependencies from extra-require in "python-packages"

Metadata

Project: snapcraft (launchpad)
Number: #1817771
Type: issue
State: open
Author: ~ack
Labels: —
Created: 2019-02-26 06:07 PM UTC
Updated: 2019-02-26 06:07 PM UTC
Closed: —

Current evaluation

Python plugin ignores extra-require dependencies when multiple extras are specified for the same package (e.g. SQLAlchemy[postgresql] and SQLAlchemy[mysql]); only the first extra's deps install. 7+ years old, no maintainer activity, core18-based, superseded by newer plugin architecture.

Suggested action: close stale

Reason: The issue is 2743 days old with zero comments and no maintainer engagement. It targets a core18-based snap, which is an EOL base. The current codebase has been substantially reworked (python v2 plugin, plugins v2), and the original python plugin code path that mishandled multiple extras for the same package no longer exists in the same form. The workaround (listing dependencies explicitly) is straightforward, and the affected base is no longer supported.

Impact: 30 Quick Win: 18.0 Staleness: 95 Complexity: 40 Confidence: 70 Support Request: 10

Issue body

I'm trying to use the following in a core18-based snap, inside a python part: python-packages: - SQLAlchemy[postgresql] - SQLAlchemy[mysql] What happens is that only the dependencies from the first extra-part (specifically psycopg2) gets installed, whereas mysqlclient doesn't. If I specify them explicitly as python-packages: - psycopg2 - mysqlclient it works as expected. It seems multiple extra-require for the same package are not handled correctly.

Evaluation history

Date	Model	Scores	Action	Summary
2026-09-01 08:44 AM UTC	qwen/qwen3.8-27b	Impact: 30 Quick Win: 18.0 Staleness: 95 Complexity: 40 Confidence: 70 Support Request: 10	close stale	Python plugin ignores extra-require dependencies when multiple extras are specified for the same package (e.g. SQLAlchemy[postgresql] and SQLAlchemy[mysql]); only the first extra's deps install. 7+ years old, no maintainer activity, core18-based, superseded by newer plugin architecture.
2026-07-23 11:59 AM UTC	qwen/qwen3.6-35b-a3b	Staleness: 100 Complexity: 20 Confidence: 90 Support Request: 10	close stale	Over 7-year-old report regarding Python plugin dependency handling for extra-requirements. Unaddressed, references deprecated core18 base, and likely irrelevant due to major architectural changes in the project.
2026-07-22 12:20 PM UTC	qwen/qwen3.6-35b-a3b	Staleness: 100 Complexity: 30 Confidence: 90 Support Request: 20	close stale	Python plugin fails to install dependencies for multiple extras of the same package in snapcraft. Issue is completely inactive for over 7 years.
2026-07-10 02:17 AM UTC	qwen3.6-35b-a3b-mtp-q6	Staleness: 98 Complexity: 40 Confidence: 90 Support Request: 10	close stale	Python plugin fails to install dependencies for multiple extras in python-packages, only installing the first extra's dependencies. Untriaged and inactive for over 7 years.
2026-06-21 04:37 PM UTC	qwen3.6-35b-a3b-mtp-q6	Staleness: 95 Complexity: 40 Confidence: 80 Support Request: 10	close stale	Bug report stating the snapcraft python plugin fails to install system dependencies for multiple extras on the same package. Issue is 7 years old with no maintainer activity or labels.

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