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fix(remotebuild): require core20 snaps to use the legacy remote builder

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Metadata

Project
snapcraft
Number
#4895
Type
pull request
State
merged
Author
mr-cal
Labels
—
Created
Updated
Closed

Current evaluation

Merged in #4895 (d9c8781a1), requiring core20 remote builds to use the legacy builder because the new builder could not parse core20 snapcraft.yaml files; fixes #4886.

Resolution: closed resolved

Reason: PR #4895 was merged as commit d9c8781a1 and explicitly fixes #4886. It routes core20 snaps through the legacy remote builder to avoid the new builder's core20 YAML parsing failure.

Evaluated by: mr-cal-bot

No scores available.

Issue body

- [x] Have you followed the [guidelines for contributing](https://github.com/snapcore/snapcraft/blob/master/CONTRIBUTING.md)? - [x] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? - [x] Have you successfully run `tox run -m lint`? - [x] Have you successfully run `tox run -e test-py310`? (supported versions: `py39`, `py310`, `py311`, `py312`) ----- Requires core20 snaps to use the legacy remote builder because the new remote builder cannot parse core20 `snapcraft.yaml` files (#4885). Builds on #4892, so only the last commit is new. Fixes #4886 (CRAFT-3071)

Evaluation history

Date Model Scores Action Summary
stealth/space-bunny-alpha — closed resolved Merged in #4895 (d9c8781a1), requiring core20 remote builds to use the legacy builder because the new builder could not parse core20 snapcraft.yaml files; fixes #4886.
stealth/space-bunny-alpha — closed resolved Merged in #4895 (commit d9c8781a1), requiring core20 snaps to use the legacy remote builder because the new builder cannot parse their snapcraft.yaml files. Fixes #4886.
qwen/qwen3.6-35b-a3b — — Merged. Requires core20 snaps to use the legacy remote builder since the new builder cannot parse core20 snapcraft.yaml files. Resolves #4886. Approved and passed CI.
qwen3.6-35b-a3b-mtp-q6 — — Merged PR enforcing legacy remote builder usage for core20 snaps due to parsing incompatibilities. Resolves #4886.

Update history

No update history recorded yet.

Related work

Related issues

Issue Project State Summary Similarity
#4886 Use legacy remote builder for core20 snaps snapcraft closed Fixed by merged PR #4895 (commit d9c8781a1), routing core20 snaps to the legacy remote builder because the new builder could not parse architectures with run-on.
88%
#4144 remote build: legacy builder cannot parse core22 snapcraft.yaml syntax snapcraft closed Marked won't fix: legacy-builder schema support was descoped in favor of the new remote builder, which accepts build-for; legacy support was removed by PR #5994 in Snapcraft 9.
82%
#4365 remote-build: legacy builder complains about the wrong part name snapcraft closed Core22 snaps hit a bogus schema error in the legacy remote-build fallback. Closed as "won't fix" by mr-cal on 2026-01-27; the legacy remote builder was removed in #5994 and #6010 for Snapcraft 9.
77%
#4498 fix(remote): fallback to legacy snapcraft if under shallow git clone snapcraft merged Merged as 1e285148e: remote builds under shallow Git clones fall back to legacy Snapcraft on core20/core22; unsupported bases and devel report an error.
76%
#4479 remote-build broken with shallow clones snapcraft closed Fixed in Snapcraft 8.0.1 by PR #4498 (commit 1e285148e), which falls back to the legacy remote builder for shallow Git clones on core20/core22.
76%
#300 Remote-build: use craft-application for core22 craft-application closed Core22 remote builds moved to craft-application in merged Snapcraft PR #4724 (commit 9905f2831), removing the legacy core22 build path.
76%
#1992557 snapcraft remote-build snapcraft.yaml validation too strict snapcraft (launchpad) closed Strict validation in snapcraft remote-build rejected empty LD_LIBRARY_PATH for core22 snaps. Resolved by the new remote builder, which fixes the legacy core18/20 implementation bug.
76%
#5427 Add a deprecation notice for building core22 snaps with the legacy remote builder snapcraft closed Added the core22 legacy remote-builder deprecation warning in Snapcraft 8.10 via merged PR #5523 (commit 1d8e87486).
76%
#5676 remote build: remove legacy remote builder snapcraft closed Fixed in merged PR #5994 (commit b08f1a66e) for Snapcraft 9.0 by removing the legacy remote builder, selection logic, strategy env var, and legacy credential support.
76%
#2720 remote build: switch from core to core18 snapcraft merged Merged PR #2720 switched remote builds from core to core18, aligning them with Snapcraft edge; landed as commit d2b36b2f4.
76%