From 80ec6872aceb18c68b1cf5b6f8acd6ad667cbd4f Mon Sep 17 00:00:00 2001
From: Yousong Zhou <yszhou4tech@gmail.com>
Date: Thu, 17 Dec 2020 15:55:55 +0800
Subject: [PATCH] qga: invoke separate applets for guest-shutdown modes

/sbin/shutdown is not available on OpenWrt by default

Origin: "main/qemu: fix shutdown from guest agent"
https://gitlab.alpinelinux.org/alpine/aports/commit/76b81b486480fd9c3294cd420bcf2df01c27790d
---
 qga/commands-posix.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -76,6 +76,7 @@ static void ga_wait_child(pid_t pid, int
 void qmp_guest_shutdown(const char *mode, Error **errp)
 {
     const char *shutdown_flag;
+    const char *fallback_cmd = NULL;
     Error *local_err = NULL;
     pid_t pid;
     int status;
@@ -97,10 +98,13 @@ void qmp_guest_shutdown(const char *mode
     slog("guest-shutdown called, mode: %s", mode);
     if (!mode || strcmp(mode, "powerdown") == 0) {
         shutdown_flag = powerdown_flag;
+        fallback_cmd = "/sbin/poweroff";
     } else if (strcmp(mode, "halt") == 0) {
         shutdown_flag = halt_flag;
+        fallback_cmd = "/sbin/halt";
     } else if (strcmp(mode, "reboot") == 0) {
         shutdown_flag = reboot_flag;
+        fallback_cmd = "/sbin/reboot";
     } else {
         error_setg(errp,
                    "mode is invalid (valid values are: halt|powerdown|reboot");
@@ -125,6 +129,7 @@ void qmp_guest_shutdown(const char *mode
         execl("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
                "hypervisor initiated shutdown", (char *)NULL);
 #endif
+        execl(fallback_cmd, fallback_cmd, (char*)NULL);
         _exit(EXIT_FAILURE);
     } else if (pid < 0) {
         error_setg_errno(errp, errno, "failed to create child process");
