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.
94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
// Derived from github.com/databus23/helm-diff (Apache License 2.0).
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// See LICENSE and NOTICE.md in this directory.
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package helmdiff
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import (
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"fmt"
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"io"
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"github.com/aryann/difflib"
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"github.com/mgutz/ansi"
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)
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// Report stores diff report data and formatting state.
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type Report struct {
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format ReportFormat
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Entries []ReportEntry
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mode string
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findRenames float32
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}
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// ReportEntry stores changes for a single Kubernetes object.
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type ReportEntry struct {
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Key string
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SuppressedKinds []string
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Kind string
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Context int
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Diffs []difflib.DiffRecord
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ChangeType string
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}
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// ReportFormat holds the output renderer and change-type styles.
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type ReportFormat struct {
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output func(r *Report, to io.Writer)
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changestyles map[string]ChangeStyle
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}
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// ChangeStyle controls how a single change type is rendered.
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type ChangeStyle struct {
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color string
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message string
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}
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// setupReportFormat configures the report's output renderer.
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// Only the default unified-diff format is supported.
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func (r *Report) setupReportFormat(format string) {
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r.mode = format
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setupDiffReport(r)
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}
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// addEntry appends a single diff entry to the report.
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func (r *Report) addEntry(key string, suppressedKinds []string, kind string, context int, diffs []difflib.DiffRecord, changeType string) {
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entry := ReportEntry{
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key,
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suppressedKinds,
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kind,
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context,
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diffs,
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changeType,
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}
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r.Entries = append(r.Entries, entry)
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}
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// print writes all entries via the configured output renderer.
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func (r *Report) print(to io.Writer) {
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r.format.output(r, to)
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}
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// clean resets the entries slice (used by tests).
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func (r *Report) clean() {
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r.Entries = nil
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}
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func setupDiffReport(r *Report) {
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r.format.output = printDiffReport
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r.format.changestyles = make(map[string]ChangeStyle)
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r.format.changestyles["ADD"] = ChangeStyle{color: "green", message: "has been added:"}
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r.format.changestyles["REMOVE"] = ChangeStyle{color: "red", message: "has been removed:"}
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r.format.changestyles["MODIFY"] = ChangeStyle{color: "yellow", message: "has changed:"}
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r.format.changestyles["MODIFY_SUPPRESSED"] = ChangeStyle{color: "blue+h", message: "has changed, but diff is empty after suppression."}
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}
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func printDiffReport(r *Report, to io.Writer) {
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for _, entry := range r.Entries {
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_, _ = fmt.Fprintf(
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to,
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ansi.Color("%s %s", r.format.changestyles[entry.ChangeType].color)+"\n",
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entry.Key,
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r.format.changestyles[entry.ChangeType].message,
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)
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printDiffRecords(entry.SuppressedKinds, entry.Kind, entry.Context, entry.Diffs, to)
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}
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}
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