[Qemu-devel] [PATCH 3/3] qemu-sockets: Report explicit error if unlink fails

[Cole Robinson <crobinso@redhat.com>]

It's possible via libvirt for a user to request an explicit socket path
that qemu lacks permissions to unlink, but the error that's reported
is from bind(2), 'Address already in use'

bind(2) will fail if the unix socket path already exists, so we need to
unlink first. But we should report the unlink failure

Signed-off-by: Cole Robinson <crobinso@redhat.com>
---
 util/qemu-sockets.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 87c9bc6..9ef3f7c 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -729,7 +729,11 @@ int unix_listen_opts(QemuOpts *opts, Error **errp)
         qemu_opt_set(opts, "path", un.sun_path, &error_abort);
     }
 
-    unlink(un.sun_path);
+    if (access(un.sun_path, F_OK) &&
+        unlink(un.sun_path) < 0) {
+        error_setg_errno(errp, errno, "Failed to unlink socket %s", un.sun_path);
+        goto err;
+    }
     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
         error_setg_errno(errp, errno, "Failed to bind socket to %s", un.sun_path);
         goto err;
-- 
2.3.6