Initial import

.gitignore

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+# Allowlisting gitignore template for GO projects prevents us
+# from adding various unwanted local files, such as generated
+# files, developer configurations or IDE-specific files etc.
+#
+# Recommended: Go.AllowList.gitignore
+
+# Ignore everything
+*
+
+# But these files...
+!.gitignore
+
+!*.go
+!go.sum
+!go.mod
+
+!README.md
+!LICENSE
+
+!Makefile
+
+!*.sh
+!*.md
+
+# ...even if they are in subdirectories
+!*/

fs.go

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+package sys
+
+import (
+  "runtime"
+  "path/filepath"
+)
+
+func Rootify(path string) string {
+  return filepath.Join(GetProjectRoot(), path)
+}
+
+func GetProjectRoot() string {
+    _, b, _, _ := runtime.Caller(0)
+    // b is the absolute path to this specific .go file
+    // 1st Dir() gets the folder containing the file
+    // 2nd Dir() gets the parent of that folder
+    return filepath.Dir(filepath.Dir(b))
+}

go.mod

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+module git.gsuntres.com/gsuntres/sys
+
+go 1.25.0

main.go

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+package sys
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+	"sync"
+	"log"	
+)
+
+var onExitMutex sync.Mutex
+
+var onExitHandlers int
+
+func init() {
+	onExitHandlers = 0
+}
+
+type OnExitFunc func()
+
+func OnExit(fn OnExitFunc) {
+	onExitMutex.Lock()
+	onExitHandlers++
+	onExitMutex.Unlock()
+
+	// shutdown hook
+	c := make(chan os.Signal, 2)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		<-c
+		// ctx, cancel := context.WithTimeout(context.Background(), *wait)
+		// defer cancel()
+		// Doesn't block if no connections, but will otherwise wait
+		// until the timeout deadline.
+
+		log.Println("Calling on exit...")
+
+		// controller.Stop()
+		fn()
+
+		onExitMutex.Lock()
+		onExitHandlers--
+		onExitMutex.Unlock()
+
+		// Optionally, you could run srv.Shutdown in a goroutine and block on
+		// <-ctx.Done() if your application should wait for other services
+		// to finalize based on context cancellation.
+
+		if onExitHandlers == 0 {
+			log.Println("no more exit handler, will exit")
+			os.Exit(0)
+		}
+	}()
+}