`plugin: meson` no longer functional for Rust on `base:` < `core22` "Could not find an implementation of tomllib, nor toml2json"
Metadata
Current evaluation
Meson-based Rust builds on core20 fail after Meson 1.5 requires a TOML parser. Maintainers accepted the scenario and chose archive-installed build tools, but no implementation or resolution is recorded.
Suggested action: keep open
Reason: The debug log pinpoints Meson 1.5.1 failing because core20 lacks tomllib or toml2json, and mr-cal explicitly agreed that unpinned build tools on old bases should come from the Ubuntu archive. Implementing that cross-project behavior and its base-specific overrides needs design and compatibility tests, while the current support chart still lists core20 as supported by Snapcraft 8.
Evaluated by: mr-cal-bot
Impact:
52
Quick Win:
15
Complexity:
62
Confidence:
92
Actionability:
76
Issue body
Trying to rebuild a `base: core20` snap using `plugin: meson`, I now get:
```
$ snapcraft --debug
Launching a VM.
cSkipping pull anon-shm-preload (already ran)
Skipping pull fonts (already ran)
Skipping pull libfeedback (already ran)
Skipping pull recipe-version (already ran)
Skipping pull squeekboard-patches (already ran)
Skipping pull squeekboard (already ran)
'gtk-prep' has dependencies that need to be staged: squeekboard
Skipping pull squeekboard (already ran)
Building squeekboard
+ snapcraftctl build
+ /usr/bin/python3 -m pip install -U meson
Requirement already up-to-date: meson in /usr/local/lib/python3.8/dist-packages (1.5.1)
+ '[' '!' -f build.ninja ']'
+ meson --prefix /usr -Dstrict=false -Dbuildtype=release /root/parts/squeekboard/src/
The Meson build system
Version: 1.5.1
Source dir: /root/parts/squeekboard/src
Build dir: /root/parts/squeekboard/build
Build type: native build
../src/meson.build:1:0: ERROR: Could not find an implementation of tomllib, nor toml2json
```
Meson 1.5.0 added a dependency on TOML parsing to support Cargo.toml:
https://mesonbuild.com/Release-notes-for-1-5-0.html
There are a couple possible workarounds:
- `python3 -m pip -U install tomli` before `snapcraftctl build`
- set `meson-version: 1.4.2` for the part
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| stealth/space-bunny-alpha |
Impact:
52
Quick Win:
15
Complexity:
62
Confidence:
92
Actionability:
76
|
keep open | Meson-based Rust builds on core20 fail after Meson 1.5 requires a TOML parser. Maintainers accepted the scenario and chose archive-installed build tools, but no implementation or resolution is recorded. | |
| stealth/space-bunny-alpha |
Impact:
48
Quick Win:
17
Complexity:
58
Confidence:
91
Actionability:
82
|
keep open | Open: Meson 1.5 installed by Snapcraft on core20 lacks a TOML parser, breaking Rust Meson builds; workarounds exist, and maintainers planned archive-based build-tool provisioning. | |
| stealth/space-bunny-alpha |
Impact:
58
Quick Win:
30
Complexity:
33
Confidence:
94
Actionability:
76
|
close stale | Meson 1.5 breaks Rust builds on core20 because its Python 3.8 environment lacks a TOML parser. The report is reproducible and has workarounds; current Snapcraft 9 removes core20 support. | |
| qwen3.6-35b-a3b-mtp-q6 |
Impact:
30
Quick Win:
18
Staleness:
85
Complexity:
40
Confidence:
55
Support Request:
15
|
close stale | Meson plugin fails on base < core22 due to Meson 1.5.0 requiring tomllib for Cargo.toml parsing. Unlabelled, no maintainer response, inactive for 707 days. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
90
Complexity:
40
Confidence:
85
Support Request:
20
|
needs triage | Untriaged report of meson plugin failing on older bases due to Meson 1.5+ TOML parsing requirement. No maintainer response or labels after over two years. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
95
Complexity:
20
Confidence:
85
Support Request:
10
|
close stale | Meson plugin fails on bases older than core22 due to missing TOML parsing dependencies after Meson 1.5.0. Over two years old with no maintainer response and includes workarounds. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
95
Complexity:
20
Confidence:
85
Support Request:
10
|
close stale | Meson plugin fails on core20 base due to missing tomllib after Meson 1.5.0 update. Issue is two years old, has no maintainer response, and includes workarounds. |
Update history
| Date | Change |
|---|---|
| created |
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