fix(update): preserve Kptfile formatting during upgrades by Jaisheesh-2006 · Pull Request #4427 · kptdev/kpt

Jaisheesh-2006 · 2026-03-06T07:09:31Z

Description

This PR fixes Kptfile formatting drift during package upgrades by switching upgrade-time Kptfile handling to an SDK-backed read/update flow and removing legacy rewrite logic from kptops helpers.

Motivation

During kpt pkg update, Kptfile rewrites could alter user formatting/comments in ways that were not intended.
Issue #4306 tracks this regression and expects upgrade behavior to preserve user-authored Kptfile structure as much as possible.

What Changed

Refactored upgrade-path Kptfile read/update operations to use SDK-backed Kptfile handling in kptfileutil.
Removed legacy custom Kptfile rewrite behavior in pkg/lib/kptops helper flows, reusing the centralized updater.
Hardened tests for cross-platform consistency:
- line ending normalization where needed
- environment-aware symlink assertions
- Kptfile-focused preservation coverage

Scope

This change targets upgrade and related Kptfile mutation paths only, with no intended functional change to unrelated package/resource update behavior.

Testing

Validated with targeted and package-level tests, including:

go test ./pkg/kptfile/... -count=1
go test ./pkg/lib/kptops -count=1
go test ./commands/pkg/update -count=1
go test ./internal/util/update/... -count=1

Issue

Fixes #4306

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Copilot

Pull request overview

This PR addresses Kptfile formatting/comment drift during kpt pkg update by switching upgrade-time Kptfile mutations to an SDK-backed read/modify/write flow intended to preserve YAML structure and comments.

Changes:

Refactors kptops Kptfile update helpers to use kptfileutil.UpdateKptfileContent rather than re-marshalling via kyaml.
Adds SDK-based Kptfile write/update logic in kptfileutil to better preserve formatting/comments.
Hardens tests for cross-platform behavior (CRLF normalization, environment-aware symlink assertions) and adds Kptfile preservation coverage.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pkg/lib/kptops/render_test.go	Normalizes CRLF/LF in golden comparisons to reduce cross-platform diffs.
pkg/lib/kptops/clone_test.go	Adds tests asserting UpdateUpstream/UpdateName preserve comments/formatting.
pkg/lib/kptops/clone.go	Routes Kptfile mutations through `kptfileutil.UpdateKptfileContent` to preserve formatting.
pkg/kptfile/kptfileutil/util_test.go	Adds tests for comment/format preservation during `UpdateKptfile`.
pkg/kptfile/kptfileutil/util.go	Introduces SDK-based Kptfile write/update utilities and updates decode flow.
internal/util/get/get_test.go	Makes symlink assertions conditional on whether symlinks materialize in the test environment.
internal/builtins/pkg_context_test.go	Normalizes CRLF/LF for deterministic output comparison.

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internal/builtins/pkg_context_test.go

internal/util/get/get_test.go

pkg/kptfile/kptfileutil/util_test.go

pkg/kptfile/kptfileutil/util.go

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

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pkg/kptfile/kptfileutil/util.go

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

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pkg/kptfile/kptfileutil/util.go

internal/util/get/get_test.go

pkg/lib/kptops/clone_test.go

pkg/kptfile/kptfileutil/util.go

Copilot

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

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pkg/kptfile/kptfileutil/util.go

internal/util/get/get_test.go

pkg/kptfile/kptfileutil/util.go

Use SDK-backed Kptfile read/update flow in upgrade paths, remove legacy rewrite behavior from kptops helpers, and harden tests for cross-platform stability. Fixes kptdev#4306 Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Reuse DecodeKptfile validation in UpdateKptfileContent so invalid, deprecated, or unknown-field Kptfiles fail before SDK processing. Strip SDK-internal metadata annotations before applying mutations to avoid writing internal config.kubernetes.io fields back to user Kptfiles. Add regression tests covering validation parity, annotation stripping, empty annotation cleanup, and nil-safe handling. Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

…ly expectation Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Copilot

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

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pkg/kptfile/kptfileutil/util.go

…Kptfile Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

internal/util/render/executor_test.go

pkg/kptfile/kptfileutil/util.go

mozesl-nokia · 2026-04-09T08:12:54Z

pkg/kptfile/kptfileutil/util.go

+	return nil
+}
+
+func applyTypedKptfileToSDK(sdkKptfile *kptfileko.KptfileKubeObject, desired *kptfilev1.KptFile) error {


Suggested change

func applyTypedKptfileToSDK(sdkKptfile *kptfileko.KptfileKubeObject, desired *kptfilev1.KptFile) error {

func applyTypedKptfileToKubeObject(sdkKptfile *kptfileko.KptfileKubeObject, desired *kptfilev1.KptFile) error {

mozesl-nokia · 2026-04-09T08:18:51Z

pkg/lib/kptops/clone_test.go

+func normalizeLineEndings(s string) string {
+	return strings.ReplaceAll(s, "\r\n", "\n")
+}
+
+func normalizeAndTrim(s string) string {
+	return strings.TrimSpace(normalizeLineEndings(s))
+}


You could probably move these to a more central place and use them elsewhere

Good idea. I have moved these functions to internal/util/strings/strings.go file so they can be reused across the test suite.

mozesl-nokia · 2026-04-09T08:19:43Z

internal/builtins/pkg_context_test.go

+			expected := strings.ReplaceAll(string(exp), "\r\n", "\n")
+			actual := strings.ReplaceAll(out.String(), "\r\n", "\n")


You could use that normalizeLineEndings function here

mozesl-nokia · 2026-04-09T08:20:21Z

pkg/lib/kptops/render_test.go

+			got := strings.ReplaceAll(output.String(), "\r\n", "\n")
+			want := strings.ReplaceAll(string(readFile(t, filepath.Join(testdata, test.name, test.want))), "\r\n", "\n")


You could use that normalizeLineEndings function here

mozesl-nokia · 2026-04-09T08:36:06Z

pkg/kptfile/kptfileutil/util_test.go

+			if !assert.NoError(t, err) {
+				t.FailNow()
+			}


I can see a lot of these, please use require.NoError instead

Thank you for pointing out the best practice regarding require versus assert. I have updated all the error and nil checks to use require in the specific test files modified for this PR (executor_test.go and util_test.go).

I noticed there are many other instances of assert.NoError across the broader repository. To prevent scope creep and keep this PR easy to review, I would like to handle those in a separate, dedicated refactoring PR once this feature is merged. Let me know if that works for you!

pkg/kptfile/kptfileutil/util_test.go

…rtions Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Copilot

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

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pkg/kptfile/kptfileutil/util_test.go

internal/util/render/executor_test.go

internal/builtins/pkg_context_test.go

…iene Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Jaisheesh-2006 requested review from efiacor, kispaljr, liamfallon and mozesl-nokia as code owners March 6, 2026 07:09

Copilot AI review requested due to automatic review settings March 6, 2026 07:09

dosubot bot added size:XL This PR changes 500-999 lines, ignoring generated files. bug Something isn't working go Pull requests that update Go code labels Mar 6, 2026

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Jaisheesh-2006 force-pushed the fix/4306-prevent-kptfile-upgrade branch from e6f980d to ffd9c47 Compare March 6, 2026 07:52

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Jaisheesh-2006 force-pushed the fix/4306-prevent-kptfile-upgrade branch from ffd9c47 to a4335c5 Compare March 6, 2026 09:59

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Jaisheesh-2006 and others added 6 commits April 9, 2026 00:45

fix(update): preserve Kptfile formatting during upgrades

57d3f5a

Use SDK-backed Kptfile read/update flow in upgrade paths, remove legacy rewrite behavior from kptops helpers, and harden tests for cross-platform stability. Fixes kptdev#4306 Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

fix(update) : implement copilot suggestions

5898d82

Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

fix : explicitly treat maps and slices

99a8ef4

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

fix: harden kptfile writes, stabilize tests, and relax flaky live-app…

e1e044d

…ly expectation Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

fix(e2e): quote reconcile summary optional output in crd-and-cr config

9d4fa6c

Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

Copilot started reviewing on behalf of Jaisheesh-2006 April 8, 2026 19:15 View session

Jaisheesh-2006 force-pushed the fix/4306-prevent-kptfile-upgrade branch from ab5870c to 9d4fa6c Compare April 8, 2026 19:16

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fix(kptfileutil): harden write/update paths and recover from invalid …

f536bb8

…Kptfile Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

mozesl-nokia reviewed Apr 9, 2026

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test: centralize normalization helpers and clean up kptfile test asse…

757e1bd

…rtions Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

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dosubot bot added size:XXL This PR changes 1000+ lines, ignoring generated files. and removed size:XL This PR changes 500-999 lines, ignoring generated files. labels Apr 10, 2026

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fix: preserve kptfile handling semantics and tighten related test hyg…

086f6cb

…iene Signed-off-by: Jaisheesh-2006 <jaicodes2006@gmail.com>

	func applyTypedKptfileToSDK(sdkKptfile kptfileko.KptfileKubeObject, desired kptfilev1.KptFile) error {
	func applyTypedKptfileToKubeObject(sdkKptfile kptfileko.KptfileKubeObject, desired kptfilev1.KptFile) error {

		expected := strings.ReplaceAll(string(exp), "\r\n", "\n")
		actual := strings.ReplaceAll(out.String(), "\r\n", "\n")

		got := strings.ReplaceAll(output.String(), "\r\n", "\n")
		want := strings.ReplaceAll(string(readFile(t, filepath.Join(testdata, test.name, test.want))), "\r\n", "\n")

Conversation

Jaisheesh-2006 commented Mar 6, 2026

Description

Motivation

What Changed

Scope

Testing

Issue

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