From e5bfc661bc181a36fa70250470554b20002fb84d Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Thu, 16 Feb 2023 12:07:42 +0100
Subject: [PATCH] qemu_passt: Deduplicate passt killing code

There are two places where we kill passt:

1) qemuPasstStop() - called transitively from qemuProcessStop(),
2) qemuPasstStart() - after failed start.

Now, the code from 2) lack error preservation (so if there's
another error during cleanup we might overwrite the original
error). Therefore, move the internals of qemuPasstStop() into a
separate function and call it from both places.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>
---
 src/qemu/qemu_passt.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/src/qemu/qemu_passt.c b/src/qemu/qemu_passt.c
index c082c149cd..2733f8e03f 100644
--- a/src/qemu/qemu_passt.c
+++ b/src/qemu/qemu_passt.c
@@ -102,11 +102,9 @@ qemuPasstAddNetProps(virDomainObj *vm,
 }
 
 
-void
-qemuPasstStop(virDomainObj *vm,
-              virDomainNetDef *net)
+static void
+qemuPasstKill(const char *pidfile)
 {
-    g_autofree char *pidfile = qemuPasstCreatePidFilename(vm, net);
     virErrorPtr orig_err;
 
     virErrorPreserveLast(&orig_err);
@@ -118,6 +116,16 @@ qemuPasstStop(virDomainObj *vm,
 }
 
 
+void
+qemuPasstStop(virDomainObj *vm,
+              virDomainNetDef *net)
+{
+    g_autofree char *pidfile = qemuPasstCreatePidFilename(vm, net);
+
+    qemuPasstKill(pidfile);
+}
+
+
 int
 qemuPasstSetupCgroup(virDomainObj *vm,
                      virDomainNetDef *net,
@@ -147,7 +155,6 @@ qemuPasstStart(virDomainObj *vm,
     g_autofree char *errbuf = NULL;
     char macaddr[VIR_MAC_STRING_BUFLEN];
     size_t i;
-    pid_t pid = (pid_t) -1;
     int exitstatus = 0;
     int cmdret = 0;
 
@@ -273,10 +280,6 @@ qemuPasstStart(virDomainObj *vm,
     return 0;
 
  error:
-    ignore_value(virPidFileReadPathIfLocked(pidfile, &pid));
-    if (pid != -1)
-        virProcessKillPainfully(pid, true);
-    unlink(pidfile);
-
+    qemuPasstKill(pidfile);
     return -1;
 }