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butane: check local and tree file compression - #2348
#2343 checks inline contents against compression: gzip. Contents from local and from trees are only read during translation, so they were not checked: a plain local file with compression: gzip still transpiles cleanly and fails at first boot with gzip: invalid header.
They are now checked in translation, right after the file is read: in translateResource for local, and in walkTree for tree files, which get their compression from a storage.files entry for the same path. The mismatch is reported with AddOnError and translation continues, for the same reason the inline check lives in Resource.Validate: returning an error would hide the other diagnostics.
I mentioned the tree case on #2343 and kept it in this PR; I can split it out if you'd prefer.
This applies to the same base specs as #2343. base/v0_1 has no local or trees, so it is unaffected. The release note for #2343 now covers local and tree contents too.
Tested:
New cases in TestTranslateFile (a gzipped local file passes, a plain one with compression: gzip is reported) and TestTranslateTree (a plain tree file that gets compression: gzip from storage.files is reported), for each spec.
go test ./butane/... passes.
The Butane CLI, on a config with a plain local file, a gzipped local file and a plain tree file, all with compression: gzip: both plain files are reported in the same run, and the gzipped one is accepted.
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GitHub Check: CodeRabbit
GitHub Check: Test ignition-validate (1.26.x, windows-latest)
Butane now reports compression-format errors for local resource contents and files loaded from storage trees across base versions v0_2 through v0_8_exp. The checks continue translation, and tests cover valid gzip data and mismatches.
Changes: Compression validation
Layer / File(s)
Summary
Local resource compression validation butane/base/v0_*/translate.go, butane/base/v0_*/translate_test.go
Local resource contents are checked against the declared compression format. Mismatches add an error at the local-resource path without stopping translation. Tests cover gzip data and uncompressed data declared as gzip.
Tree files are checked against the matching storage-file compression setting. Mismatches add an error at the contents-compression path. Tests cover this case, and the release note describes the validation.
coreos/ignition#2343: Adds the compression-format validator and error reused by this change.
coreos/ignition#2347: Defines the release-note fragment convention used by this change.
coreos/ignition#2352: Adds the release-note validation requirement satisfied by this change.
Suggested reviewers:prestist
Merge Risk: Minimal · up to fd930
The local and tree compression validation changes are consistently implemented, and their release documentation is correctly separated.
Pre-merge checks: 5 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 5 passed
Check name
Status
Explanation
Title check
The title "butane: check local and tree file compression" names the subsystem and describes the main change: translation-time checks for compression on local and tree files. It uses lowercase after th…
Description check
The description explains the change. It says local files and tree files with compression: gzip were not checked, and it describes the new checks in translateResource and walkTree, the AddOnError repor…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
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Commit Message Convention
The PR contains one non-merge commit: butane: check local and tree file compression. It uses the butane subsystem, has a lowercase imperative description (check), and has no trailing period.
Full details: Title check
Explanation
The title "butane: check local and tree file compression" names the subsystem and describes the main change: translation-time checks for compression on local and tree files. It uses lowercase after the colon and has no trailing period. The title format requirement asks for imperative mood, and "check" is imperative, so the title meets the format rules.
Full details: Description check
Explanation
The description explains the change. It says local files and tree files with compression: gzip were not checked, and it describes the new checks in translateResource and walkTree, the AddOnError reporting, and the tests run. It also covers the related #2343 follow-up and the release note. It is specific and matches the changeset.
Full details: Docstring Coverage
Explanation
Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 21 functions across 14 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
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Inline comments:
Review comments at @docs/release-notes.md:
- Line 22: Update the release-note entry linked by the #2343 reference to point
to pull request #2348, or include links to both #2343 and #2348 if the entry
covers both changes.
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Reviewing files that changed from the base of the PR and between 85a6480 and 0b9005b.
Files selected for processing: 15
butane/base/v0_2/translate.go
butane/base/v0_2/translate_test.go
butane/base/v0_3/translate.go
butane/base/v0_3/translate_test.go
butane/base/v0_4/translate.go
butane/base/v0_4/translate_test.go
butane/base/v0_5/translate.go
butane/base/v0_5/translate_test.go
butane/base/v0_6/translate.go
butane/base/v0_6/translate_test.go
butane/base/v0_7/translate.go
butane/base/v0_7/translate_test.go
butane/base/v0_8_exp/translate.go
butane/base/v0_8_exp/translate_test.go
docs/release-notes.md
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GitHub Check: Test (1.25.x)
GitHub Check: tmt-tests
GitHub Check: Test (1.26.x)
Additional context used
Code guidelines: 1
AGENTS.md — auto-discovered
Path-based instructions: 2
Documentation served via GitHub Pages/Jekyll.
CodeRabbit configuration file
Files:
docs/release-notes.md
Source excerpt: **License header**: Required on all `.go` files (Apache 2.0, 13-line header)
CodeRabbit inference engine (AGENTS.md)
Files:
butane/base/v0_2/translate.go
butane/base/v0_7/translate_test.go
butane/base/v0_4/translate.go
butane/base/v0_5/translate.go
butane/base/v0_7/translate.go
butane/base/v0_8_exp/translate.go
butane/base/v0_3/translate_test.go
butane/base/v0_8_exp/translate_test.go
butane/base/v0_3/translate.go
butane/base/v0_6/translate_test.go
butane/base/v0_4/translate_test.go
butane/base/v0_6/translate.go
butane/base/v0_5/translate_test.go
butane/base/v0_2/translate_test.go
Learnings: 2
Common learnings
Learnt from: w453y
Repo: coreos/ignition PR: 2343
File: butane/base/v0_2/validate.go:47-51
Timestamp: 2026-10-14T13:13:06.403Z
Learning: In coreos/ignition's Go Butane resource pipeline, Resource.Validate runs before local files are read, so local contents are unavailable there. Returning a validation error from MakeDataURL through the translation path aborts translation and suppresses other diagnostics. Validation of local contents must use a mechanism that preserves diagnostic aggregation; do not recommend moving inline gzip validation into MakeDataURL without accounting for this behavior.
@angelcerveraroldan the tmt-tests failure looks unrelated to this change: the smoke test passes, and the job then fails in tmt's cleanup when stopping the podman container (podman container stop returns 125). Both runs here landed on the ubuntu-26.04 runner image. On my fork, the same job passes on ubuntu-24.04 for both main and this branch, and fails the same way for unmodified main with runs-on: ubuntu-26.04.
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The changes look good, I just have one small nit:
$ ./ignition/bin/butane --pretty --strict -d . tree-test.bu
error[$.storage.trees.0]:
--> tree-test.bu:5:7
|
3 | storage:
4 | trees:
5 | - local: tree
| ^^^^^^ contents are not gzip-compressed but compression is set to gzip
6 | path: /etc/trees
7 | files:
|
Error translating config: source config is invalid
The error message could be a little more informative, right now it just tells us that some file is wrong, but not which one.
We could leave it as is, or we could make it so that for trees, the error is reported under storage.files rather than storage.trees, this way the error would point to the exact file that has the issue. What do you think ?
Good idea, done. A tree file can only get compression from a storage.files entry for its path, so the error now points at that entry:
error[$.storage.files.1.contents.compression]:
--> t.bu:13:22
11 | - path: /etc/trees/b
12 | contents:
13 | compression: gzip
| ^^^^ contents are not gzip-compressed but compression is set to gzip
@w453y We have changed the way that we handle release notes, see the new way here.
The reason for this change is that we were seeing a lot of conflicts due to many PRs editing the same release notes file. Would you be able to rebase and make a new file in release-notes.d ?
Since coreos#2343, Butane reports inline contents that are not gzip-compressed
although `compression: gzip` is set. Contents from `local` and from
`trees` are not checked, so such a config still translates cleanly and
fails at first boot.
Their contents are only read during translation, so check them there,
after the file is read. Report the mismatch and continue instead of
returning, so the other translation diagnostics are still reported. A
tree file gets its compression from a storage.files entry for the same
path, and the mismatch is reported at that entry's `compression` field.
Signed-off-by: Abdul Wasey <[email protected]>
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angelcerveraroldan
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Follow-up to #2343, as discussed there.
#2343 checks inline contents against
compression: gzip. Contents fromlocaland fromtreesare only read during translation, so they were not checked: a plain local file withcompression: gzipstill transpiles cleanly and fails at first boot withgzip: invalid header.They are now checked in translation, right after the file is read: in
translateResourceforlocal, and inwalkTreefor tree files, which get theircompressionfrom astorage.filesentry for the same path. The mismatch is reported withAddOnErrorand translation continues, for the same reason the inline check lives inResource.Validate: returning an error would hide the other diagnostics.I mentioned the tree case on #2343 and kept it in this PR; I can split it out if you'd prefer.
This applies to the same base specs as #2343.
base/v0_1has nolocalortrees, so it is unaffected. The release note for #2343 now covers local and tree contents too.Tested:
TestTranslateFile(a gzipped local file passes, a plain one withcompression: gzipis reported) andTestTranslateTree(a plain tree file that getscompression: gzipfromstorage.filesis reported), for each spec.go test ./butane/...passes.compression: gzip: both plain files are reported in the same run, and the gzipped one is accepted.