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Aditya Menon 4f275b3667 feat: add Helm 4 support while maintaining Helm 3 compatibility (#2262)
This commit adds comprehensive support for Helm 4 while maintaining
full backward compatibility with Helm 3. The implementation includes:

- Updated helm version detection to support both Helm 3 and Helm 4
- Added HELMFILE_HELM4 environment variable to control Helm version
- Modified helm execution paths to handle version-specific binaries
- Updated helm plugin installation to support split architecture

- Helm 4: Uses split plugin architecture (3 separate .tgz files)
  - helm-secrets.tgz
  - helm-secrets-getter.tgz
  - helm-secrets-post-renderer.tgz
- Helm 3: Continues using single plugin installation
- Updated Dockerfiles, CI workflows, and core installation code

- Helm 4 requires post-renderers to be plugins, not executable scripts
- Created Helm plugin structure for integration tests
- Updated helmfile.yaml templates to dynamically select renderer type
- Added test plugins: add-cm, add-cm1, add-cm2

- Updated integration tests for Helm 3/4 compatibility
- Created Helm 4 variant expected output files
- Fixed test determinism issues (repo cleanup between iterations)
- Added version-specific output filtering for warnings/messages

- Updated workflows to test both Helm 3 and Helm 4
- Matrix testing across Helm versions
- Updated helm-diff to v3.14.0 for compatibility

- Updated README and docs with Helm 4 information
- Added migration guidance
- Updated version requirements

All changes are backward compatible - existing Helm 3 users will
see no behavior changes.



fix: update Helm 4 lint expected output to match filtered output

The grep filter removes the semver warning, so the expected output
should not include it. Updated lint-helm4 files to match the filtered
output (warning removed, no extra blank line).

Signed-off-by: Aditya Menon <amenon@canarytechnologies.com>
2025-11-19 07:49:30 +08:00

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Building dependency release=foo, chart=../../../charts/raw
Building dependency release=baz, chart=../../../charts/raw
Comparing release=foo, chart=../../../charts/raw, namespace=helmfile-tests
helmfile-tests, cm2, ConfigMap (v1) has been added:
-
+ # Source: generated-by-postrender-1.yaml
+ apiVersion: v1
+ kind: ConfigMap
+ data:
+ name: cm2
+ metadata:
+ name: cm2
helmfile-tests, foo-1, ConfigMap (v1) has been added:
-
+ # Source: raw/templates/resources.yaml
+ apiVersion: v1
+ kind: ConfigMap
+ metadata:
+ name: foo-1
+ namespace: helmfile-tests
+ data:
+ foo: FOO
Comparing release=baz, chart=../../../charts/raw, namespace=helmfile-tests
helmfile-tests, baz-3, ConfigMap (v1) has been added:
-
+ # Source: raw/templates/resources.yaml
+ apiVersion: v1
+ kind: ConfigMap
+ metadata:
+ name: baz-3
+ namespace: helmfile-tests
+ data:
+ baz: BAZ
helmfile-tests, cm1, ConfigMap (v1) has been added:
-
+ # Source: generated-by-postrender-1.yaml
+ apiVersion: v1
+ kind: ConfigMap
+ data:
+ name: cm1
+ metadata:
+ name: cm1