package main

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// A relative exit-marker command passes os.Stat and is then refused by systemd when the FIRST run
// tries to start — measured on systemd 259: "neither a valid executable name nor an absolute path",
// which fails the whole unit. The platform then claims the attempt, fails to spawn, gives the claim
// back and repeats on every sweep, so the only symptom is that nothing ever runs (register row
// PD-165). Refused at boot instead, where an operator is watching, exactly as StateDir is.
//
// Mutation caught: dropping the filepath.IsAbs guard and relying on os.Stat.
func TestARelativeExitMarkerCommandIsRefusedAtBoot(t *testing.T) {
	dir := t.TempDir()
	bin := filepath.Join(dir, "tmplatformctl")
	if err := os.WriteFile(bin, []byte("#!/bin/sh\n"), 0o755); err != nil {
		t.Fatal(err)
	}
	// The same file, named relatively from a working directory where it really is present: os.Stat
	// says yes and systemd says no, which is the whole of the defect.
	t.Chdir(dir)
	if _, err := markerArgv("./tmplatformctl"); err == nil {
		t.Fatal("a relative exit-marker command was accepted; systemd refuses it and every run would fail to start")
	} else if !strings.Contains(err.Error(), "absolute") {
		t.Errorf("the refusal does not name the cause: %v", err)
	}
	argv, err := markerArgv(bin)
	if err != nil {
		t.Fatalf("an absolute command was refused: %v", err)
	}
	if len(argv) != 2 || argv[0] != bin || argv[1] != "exit-marker" {
		t.Errorf("argv = %v", argv)
	}
}