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feat: add scheduler-k3s:preview subcommand

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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.
This commit is contained in:
Jose Diaz-Gonzalez
2026-06-02 20:28:31 -04:00
parent db798dfe16
commit 496ede44b7
15 changed files with 2078 additions and 563 deletions
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1
plugins/scheduler-k3s/src/commands/commands.go
View File

@@ -29,6 +29,7 @@ Additional commands:`
scheduler-k3s:initialize [--server-ip SERVER_IP] [--taint-scheduling], Initializes a cluster
scheduler-k3s:labels:set <app|--global> <property> (<value>) [--process-type PROCESS_TYPE] <--resource-type RESOURCE_TYPE>, Set or clear a label for a given app/process-type/resource-type combination
scheduler-k3s:labels:report [<app>|--global] [--format stdout|json] [--process-type PROCESS_TYPE] [--resource-type RESOURCE_TYPE], Displays a scheduler-k3s labels report for one or more apps
scheduler-k3s:preview <app> [--show-secrets] [--show-secrets-decoded], Displays a diff between the current and next deployment for an app
scheduler-k3s:profiles:add <profile> [--role ROLE] [--insecure-allow-unknown-hosts] [--taint-scheduling] [--kubelet-args KUBELET_ARGS], Adds a node profile to the k3s cluster
scheduler-k3s:profiles:list [--format json|stdout], Lists all node profiles in the k3s cluster
scheduler-k3s:profiles:remove <profile>, Removes a node profile from the k3s cluster

7
plugins/scheduler-k3s/src/subcommands/subcommands.go
View File

@@ -158,6 +158,13 @@ func main() {
appName = "--global"
}
err = scheduler_k3s.CommandLabelsReport(appName, *format, *processType, *resourceType, infoFlag)
case "preview":
args := flag.NewFlagSet("scheduler-k3s:preview", flag.ExitOnError)
showSecrets := args.Bool("show-secrets", false, "--show-secrets: do not redact secret values in the output")
showSecretsDecoded := args.Bool("show-secrets-decoded", false, "--show-secrets-decoded: render secret values base64-decoded")
args.Parse(os.Args[2:])
appName := args.Arg(0)
err = scheduler_k3s.CommandPreview(appName, *showSecrets, *showSecretsDecoded)
case "profiles:add":
args := flag.NewFlagSet("scheduler-k3s:profiles:add", flag.ExitOnError)
role := args.String("role", "worker", "role: [ server | worker ]")