Golang bosh-nats-sync

The following files reference the Ruby gem and will need updates once the Go binary is ready. These are **not** part of this plan's implementation scope but are enumerated for completeness:

1. **[packages/nats/packaging](packages/nats/packaging)** -- Currently builds the Ruby gem via `gem build` and `bosh_bundle_local`. Must be replaced with `go build -o ${BOSH_INSTALL_TARGET}/bin/bosh-nats-sync ./cmd/bosh-nats-sync/`. Remove Ruby gem build steps for bosh-nats-sync.
2. **[packages/nats/spec](packages/nats/spec)** -- Currently lists `bosh-nats-sync/**/`*, `bosh-common/**/`*, and `vendor/cache/*.gem` as files. The `bosh-nats-sync/**/*` glob stays but `bosh-common` and `vendor/cache` entries may no longer be needed for this package. A Go toolchain dependency must be added (replacing `director-ruby-3.3` for the sync binary, though nats-server itself doesn't need Ruby either).
3. **[jobs/nats/templates/bosh_nats_sync](jobs/nats/templates/bosh_nats_sync)** -- The wrapper script currently sources Ruby runtime env and runs `exec /var/vcap/packages/nats/bin/bosh-nats-sync -c ...`. Remove the Ruby runtime source line; the Go binary is self-contained.
4. **[jobs/nats/templates/bpm.yml](jobs/nats/templates/bpm.yml)** -- Remove `BUNDLE_GEMFILE` and `GEM_HOME` env vars from the `bosh_nats_sync` process config since Go binary needs no Ruby environment.
5. **[jobs/nats/spec](jobs/nats/spec)** -- The `packages` list includes `director-ruby-3.3`. If nats-server itself doesn't need Ruby, this dependency can be removed. A `golang-1.x` package dependency must be added for compilation (or the Go binary can be cross-compiled and vendored as a blob).
6. **[src/Gemfile](src/Gemfile)** -- Remove the `gem 'bosh-nats-sync', path: 'bosh-nats-sync'` line.
7. **[src/Gemfile.lock](src/Gemfile.lock)** -- Will be regenerated after removing bosh-nats-sync from Gemfile.
8. **[spec/nats_templates_spec.rb](spec/nats_templates_spec.rb)** -- The `bosh_nats_sync_config.yml.erb` test remains valid (config format is unchanged). No changes needed unless the config format changes.
9. **[scripts/rsync-vbox](scripts/rsync-vbox)** -- References bosh-nats-sync for syncing to dev VMs; may need path adjustments.

Author: aramprice

src/bosh-nats-sync/.gitignore

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"bosh-nats-sync/pkg/config"
+	"bosh-nats-sync/pkg/runner"
+)
+
+func main() {
+	configFile := flag.String("c", "", "configuration file")
+	flag.StringVar(configFile, "config", "", "configuration file")
+	flag.Parse()
+
+	if *configFile == "" {
+		fmt.Fprintf(os.Stderr, "Usage: bosh-nats-sync -c <config_file>\n")
+		flag.PrintDefaults()
+		os.Exit(1)
+	}
+
+	cfg, err := config.Load(*configFile)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error loading config: %s\n", err)
+		os.Exit(1)
+	}
+
+	logger := config.NewLogger(cfg)
+
+	r := runner.New(cfg, logger)
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		<-sigCh
+		r.Stop()
+	}()
+
+	r.Run()
+}

src/bosh-nats-sync/bin/bosh-nats-sync

@@ -0,0 +1,25 @@
+module bosh-nats-sync
+
+go 1.26.1
+
+require (
+	github.com/onsi/ginkgo/v2 v2.28.1
+	github.com/onsi/gomega v1.39.1
+	golang.org/x/oauth2 v0.36.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/Masterminds/semver/v3 v3.4.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/google/pprof v0.0.0-20260115054156-294ebfa9ad83 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/text v0.33.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
+)

src/bosh-nats-sync/bosh-nats-sync.gemspec

@@ -0,0 +1,71 @@
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