496ede44b7
Adds a `scheduler-k3s:preview <app>` command that renders a unified diff between the manifests currently stored in the live Helm release for an app and the manifests that the next deploy would roll out. The diff is produced entirely via the Helm Go SDK that scheduler-k3s already uses, with no external `helm` binary or `helm-diff` plugin install required. The underlying diff and parse logic is vendored from `databus23/helm-diff` (Apache 2.0) into a new internal package, trimmed of three-way-merge, release-ownership tracking, and the non-default output formatters. The chart-construction half of `TriggerSchedulerDeploy` has been extracted into a reusable `BuildAppChart` helper so deploy and preview share the same chart materialization without duplicating template logic. Secret values are redacted by default in preview output; `--show-secrets` and `--show-secrets-decoded` flags match the upstream `helm diff` UX. Only the main app helm release is compared in this iteration; auxiliary releases for config vars, image-pull secrets, and TLS certificates are out of scope and documented as such.
29 lines
1.2 KiB
Markdown
29 lines
1.2 KiB
Markdown
# NOTICE
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Files in this directory are derived from
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[github.com/databus23/helm-diff](https://github.com/databus23/helm-diff),
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which is distributed under the Apache License 2.0. See `LICENSE` for the
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full text.
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Source files merged into this package:
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- `diff/diff.go`
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- `diff/report.go`
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- `manifest/parse.go`
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Modifications:
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- Merged the upstream `diff` and `manifest` packages into a single `helmdiff`
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package; references to `manifest.MappingResult` are now bare `MappingResult`.
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- Removed three-way-merge support (the upstream `manifest/generate.go` and
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`manifest/util.go` files), which imported Helm v4 and other dependencies not
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used by Dokku.
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- Removed `manifest.ParseObject`, which depended on `k8s.io/apimachinery/pkg/runtime`.
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- Removed release-ownership tracking (`ManifestsOwnership`, `OwnershipDiff`,
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`Releases`, `reIndexForRelease`).
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- Removed the simple, JSON, structured, dyff, and template output formatters and
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the upstream `diff/structured.go` and `diff/constant.go` files. Only the
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default unified-diff (`"diff"`) output format remains.
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- `setupReportFormat` is hard-wired to `setupDiffReport`.
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- `ReportEntry.Structured` and the `*Options.StructuredOutput()` method removed.
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