// SPDX-License-Identifier: GPL-3.0-or-later

package system

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

func TestCaptureUsesInjectableProcRoot(t *testing.T) {
	root := t.TempDir()
	proc := filepath.Join(root, "42")
	if err := os.Mkdir(proc, 0o700); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(proc, "comm"), []byte("bash\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(proc, "cmdline"), []byte("bash\x00-i\x00"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(proc, "environ"), []byte("LD_PRELOAD=/tmp/x.so\x00A=B\x00"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.Symlink("/tmp/x (deleted)", filepath.Join(proc, "exe")); err != nil {
		t.Fatal(err)
	}
	fdDir := filepath.Join(proc, "fd")
	if err := os.Mkdir(fdDir, 0o700); err != nil {
		t.Fatal(err)
	}
	if err := os.Symlink("/dev/input/event3", filepath.Join(fdDir, "7")); err != nil {
		t.Fatal(err)
	}
	preload := filepath.Join(root, "ld.so.preload")
	if err := os.WriteFile(preload, []byte("/tmp/global.so\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	state, err := CaptureWithPaths(Paths{ProcRoot: root, LDPreloadPath: preload})
	if err != nil {
		t.Fatal(err)
	}
	if len(state.Processes) != 1 {
		t.Fatalf("unexpected processes: %#v", state.Processes)
	}
	got := state.Processes[0]
	if got.PID != 42 || got.Comm != "bash" || got.Cmdline != "bash -i" || got.Exe != "/tmp/x (deleted)" {
		t.Fatalf("unexpected process: %#v", got)
	}
	if got.Environ["LD_PRELOAD"] != "/tmp/x.so" || got.FDTargets["7"] != "/dev/input/event3" {
		t.Fatalf("missing environment or fd state: %#v", got)
	}
	if state.LDPreload != "/tmp/global.so" {
		t.Fatalf("unexpected global preload: %q", state.LDPreload)
	}
}