Migrate to full rclone rcd

pkg/rclone/killed_unix.go

@@ -0,0 +1,43 @@
+//go:build !windows
+
+package rclone
+
+import (
+	"errors"
+	"os/exec"
+	"syscall"
+)
+
+// WasHardTerminated reports true iff the process was ended by SIGKILL or SIGTERM.
+func WasHardTerminated(err error) bool {
+	var ee *exec.ExitError
+	if !errors.As(err, &ee) {
+		return false
+	}
+	ws, ok := ee.Sys().(syscall.WaitStatus)
+	if !ok || !ws.Signaled() {
+		return false
+	}
+	sig := ws.Signal()
+	return sig == syscall.SIGKILL || sig == syscall.SIGTERM
+}
+
+// ExitCode returns the numeric exit code when available.
+func ExitCode(err error) (int, bool) {
+	var ee *exec.ExitError
+	if !errors.As(err, &ee) {
+		return 0, false
+	}
+	ws, ok := ee.Sys().(syscall.WaitStatus)
+	if !ok {
+		return 0, false
+	}
+	if ws.Exited() {
+		return ws.ExitStatus(), true
+	}
+	// Conventional shell “killed by signal” code is 128 + signal.
+	if ws.Signaled() {
+		return 128 + int(ws.Signal()), true
+	}
+	return 0, false
+}