cosmovisor: pass quit signals to subprocess (#7776)

fix #7740

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

cosmovisor/process.go

@@ -4,9 +4,13 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"log"
+	"os"
 	"os/exec"
+	"os/signal"
 	"strings"
 	"sync"
+	"syscall"
 )
 
 // LaunchProcess runs a subprocess and returns when the subprocess exits,
@@ -39,6 +43,15 @@ func LaunchProcess(cfg *Config, args []string, stdout, stderr io.Writer) (bool,
 		return false, fmt.Errorf("launching process %s %s: %w", bin, strings.Join(args, " "), err)
 	}
 
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGQUIT, syscall.SIGTERM)
+	go func() {
+		sig := <-sigs
+		if err := cmd.Process.Signal(sig); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
 	// three ways to exit - command ends, find regexp in scanOut, find regexp in scanErr
 	upgradeInfo, err := WaitForUpgradeOrExit(cmd, scanOut, scanErr)
 	if err != nil {