Building snaps with `kde-neon` extension is not working

Metadata

Project: snapcraft-rocks
Number: #37
Type: issue
State: open
Author: hhromic
Labels: —
Created: 2024-04-28 09:48 PM UTC
Updated: 2025-07-24 10:48 AM UTC
Closed: —

Current evaluation

Snapcraft Rocks images resolve extension sources to the wrong path, breaking kde-neon and GNOME extension builds; the issue remains unresolved.

Suggested action: keep open

Reason: The bug is confirmed beyond the original report: a maintainer stated that additional support work is needed, the reporter identified the `sys.prefix` path mismatch and verified that copying the extension directory resolves it, and later comments report the same failure for core24/kde-neon-6 and GNOME's `command-chain` extension. No resolving commit or release was found, and the issue remains open.

Evaluated by: mr-cal-bot

Impact: 58 Quick Win: 27 Complexity: 48 Confidence: 93 Actionability: 88

Issue body

Hello, I recently found out about this repository and its intention to be the official way to build Snap packages in Docker. I tried to build our Snap packages using `ghcr.io/canonical/snapcraft:8_core22` but sadly it did not work as expected. The problem seems to be when using the `kde-neon` extension. Consider the following `snap/snapcraft.yaml` example adapted from the [official guide for Qt5/KF applications](https://snapcraft.io/docs/qt5-kde-applications): ```yaml name: kcalc version: 19.08.0 grade: stable adopt-info: kcalc confinement: strict base: core22 apps: kcalc: common-id: org.kde.kcalc.desktop command: kcalc extensions: - kde-neon plugs: - home - opengl - network - network-bind - pulseaudio slots: session-dbus-interface: interface: dbus name: org.kde.kcalc.desktop bus: session parts: kcalc: parse-info: - usr/share/metainfo/org.kde.kcalc.appdata.xml plugin: cmake build-snaps: - kf5-5-111-qt-5-15-11-core22-sdk build-packages: - libmpfr-dev - libgmp-dev - libkf5doctools-dev stage-packages: - libmpfr6 - libgmp10 source: https://download.kde.org/stable/applications/19.08.0/src/kcalc-19.08.0.tar.xz cmake-parameters: - "-DKDE_INSTALL_USE_QT_SYS_PATHS=ON" - "-DCMAKE_INSTALL_PREFIX=/usr" - "-DCMAKE_BUILD_TYPE=Release" - "-DENABLE_TESTING=OFF" - "-DBUILD_TESTING=OFF" - "-DKDE_SKIP_TEST_SETTINGS=ON" ``` The above Snapcraft file does not build using the `ghcr.io/canonical/snapcraft:8_core22` image: ``` $ docker run -it -v `pwd`:/project ghcr.io/canonical/snapcraft:8_core22 2024-04-28T21:36:27.568Z [pebble] Started daemon. 2024-04-28T21:36:27.598Z [pebble] POST /v1/services 18.095676ms 202 2024-04-28T21:36:27.599Z [pebble] Started default services with change 1. 2024-04-28T21:36:27.610Z [pebble] Service "snapcraft" starting: /bin/run-snapcraft.sh [ pack ] 2024-04-28T21:36:27.634Z [snapcraft] 2024-04-28T21:36:27.635Z [snapcraft] WARNING: apt does not have a stable CLI interface. Use with caution in scripts. 2024-04-28T21:36:27.635Z [snapcraft] 2024-04-28T21:36:27.925Z [snapcraft] Get:1 http://archive.ubuntu.com/ubuntu jammy InRelease [270 kB] 2024-04-28T21:36:27.983Z [snapcraft] Get:2 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB] 2024-04-28T21:36:28.491Z [snapcraft] Get:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease [119 kB] 2024-04-28T21:36:28.640Z [snapcraft] Get:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease [109 kB] 2024-04-28T21:36:28.787Z [snapcraft] Get:5 http://archive.ubuntu.com/ubuntu jammy/multiverse amd64 Packages [266 kB] 2024-04-28T21:36:28.939Z [snapcraft] Get:6 http://archive.ubuntu.com/ubuntu jammy/universe amd64 Packages [17.5 MB] 2024-04-28T21:36:29.099Z [snapcraft] Get:7 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages [1755 kB] 2024-04-28T21:36:32.254Z [snapcraft] Get:8 http://security.ubuntu.com/ubuntu jammy-security/multiverse amd64 Packages [44.7 kB] 2024-04-28T21:36:32.291Z [snapcraft] Get:9 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 Packages [2265 kB] 2024-04-28T21:36:32.380Z [snapcraft] Get:10 http://archive.ubuntu.com/ubuntu jammy/restricted amd64 Packages [164 kB] 2024-04-28T21:36:32.391Z [snapcraft] Get:11 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages [1792 kB] 2024-04-28T21:36:32.705Z [snapcraft] Get:12 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages [2035 kB] 2024-04-28T21:36:33.301Z [snapcraft] Get:13 http://archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages [1370 kB] 2024-04-28T21:36:33.528Z [snapcraft] Get:14 http://archive.ubuntu.com/ubuntu jammy-updates/restricted amd64 Packages [2339 kB] 2024-04-28T21:36:33.832Z [snapcraft] Get:15 http://archive.ubuntu.com/ubuntu jammy-updates/multiverse amd64 Packages [51.1 kB] 2024-04-28T21:36:33.846Z [snapcraft] Get:16 http://archive.ubuntu.com/ubuntu jammy-backports/main amd64 Packages [81.0 kB] 2024-04-28T21:36:33.846Z [snapcraft] Get:17 http://archive.ubuntu.com/ubuntu jammy-backports/universe amd64 Packages [31.9 kB] 2024-04-28T21:36:34.320Z [snapcraft] Get:18 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages [1077 kB] 2024-04-28T21:36:37.034Z [snapcraft] Fetched 31.4 MB in 9s (3359 kB/s) 2024-04-28T21:36:37.034Z [snapcraft] Reading package lists... 2024-04-28T21:36:39.910Z [snapcraft] Building dependency tree... 2024-04-28T21:36:40.215Z [snapcraft] Reading state information... 2024-04-28T21:36:40.273Z [snapcraft] 15 packages can be upgraded. Run 'apt list --upgradable' to see them. 2024-04-28T21:36:45.918Z [snapcraft] Starting Snapcraft 8.0.5 2024-04-28T21:36:45.918Z [snapcraft] Logging execution to '/root/.local/state/snapcraft/log/snapcraft-20240428-213645.910384.log' 2024-04-28T21:36:45.957Z [snapcraft] Running on amd64 for amd64 2024-04-28T21:36:45.966Z [snapcraft] Initializing parts lifecycle 2024-04-28T21:36:45.981Z [snapcraft] Failed to pull source: unable to determine source type of '/usr/share/snapcraft/extensions/desktop/kde-neon'. 2024-04-28T21:36:45.987Z [snapcraft] Full execution log: '/root/.local/state/snapcraft/log/snapcraft-20240428-213645.910384.log' 2024-04-28T21:36:46.344Z [pebble] Service "snapcraft" stopped unexpectedly with code 1 2024-04-28T21:36:46.344Z [pebble] Service "snapcraft" on-failure action is "shutdown", triggering failure shutdown 2024-04-28T21:36:46.344Z [pebble] Server exiting! ``` The same Snapcraft file does start building correctly in Ubuntu with the regular `snapcraft` command: ``` $ snapcraft --use-lxd --verbose Starting Snapcraft 8.0.5 Logging execution to '/home/hhromic/.local/state/snapcraft/log/snapcraft-20240428-223554.190257.log' Running on amd64 for amd64 Launching instance... Starting instance Starting Snapcraft 8.0.5 Logging execution to '/tmp/snapcraft.log' Running on amd64 for amd64 Initializing parts lifecycle Installing build-packages Installing build-snaps Pulling kcalc Fetching stage-packages Pulling kde-neon/sdk Building kcalc :: + cmake /root/parts/kcalc/src -G 'Unix Makefiles' -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release -DENABLE_TESTING=OFF -DBUILD_TESTING=OFF -DKDE_SKIP_TEST_SETTINGS=ON :: -- The C compiler identification is GNU 11.2.0 :: -- The CXX compiler identification is GNU 11.2.0 :: -- Detecting C compiler ABI info :: -- Detecting C compiler ABI info - done :: -- Check for working C compiler: /usr/bin/cc - skipped :: -- Detecting C compile features :: -- Detecting C compile features - done :: -- Detecting CXX compiler ABI info :: -- Detecting CXX compiler ABI info - done ... ``` > **Warning:** The kcalc build itself does not actually succeed in this example, but at least it does start building. Is there something I'm doing wrong when using the `ghcr.io/canonical/snapcraft:8_core22` image or Snapcraft files using extensions is not yet supported by the images in this repository?

Evaluation history

Date	Model	Scores	Action	Summary
2026-10-02 05:59 PM UTC	stealth/space-bunny-alpha	Impact: 58 Quick Win: 27 Complexity: 48 Confidence: 93 Actionability: 88	keep open	Snapcraft Rocks images resolve extension sources to the wrong path, breaking kde-neon and GNOME extension builds; the issue remains unresolved.
2026-09-21 08:58 PM UTC	qwen/qwen3.6-35b-a3b	Impact: 65 Quick Win: 30 Complexity: 45 Confidence: 80 Actionability: 85	keep open	Snapcraft Docker/Rocks images fail to locate extensions because sys.prefix points to /snap/snapcraft/current/usr instead of /snap/snapcraft/current, causing extension paths to resolve incorrectly. Confirmed still present in core24/snapcraft 8.6.0.
2026-09-01 05:06 AM UTC	qwen/qwen3.8-27b	Impact: 60 Quick Win: 27 Staleness: 45 Complexity: 55 Confidence: 70 Support Request: 15	keep open	Snapcraft Docker images (ghcr.io/canonical/snapcraft:8_core22) fail to build snaps using the kde-neon extension: 'unable to determine source type of /usr/share/snapcraft/extensions/desktop/kde-neon'. Root cause is snapcraft's get_extensions_data_dir() hard-coding sys.prefix, which resolves to the wrong path in the Docker image. Confirmed still broken for core24/kde-neon-6 and GNOME in 2025.
2026-07-22 01:22 PM UTC	qwen/qwen3.6-35b-a3b	Staleness: 75 Complexity: 30 Confidence: 85 Support Request: 10	needs triage	Reports kde-neon extension build failures in the snapcraft Docker image due to a hardcoded Python path mismatch. Confirmed unresolved in newer versions, awaiting maintainer investigation.
2026-07-09 04:53 AM UTC	qwen3.6-35b-a3b-mtp-q6	Staleness: 75 Complexity: 40 Confidence: 85 Support Request: 10	keep open	Bug in Snapcraft Docker/Rocks images where extensions fail to load due to incorrect Python sys.prefix path resolution. Validated across multiple extensions and Snapcraft versions, but remains unaddressed.

Update history

No update history recorded yet.

Related issues

Issue	Project	State	Summary	Similarity
#1881963 extension: kde-neon fails on arm64	snapcraft (launchpad)	closed	Closed as expected dependency behavior: the KDE Neon extension required upstream KDE Frameworks snaps that lacked arm64 builds at the time.	71%