Re: [libvirt PATCH] rpc: don't try to spawn non-existant daemon

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On Wed, Jan 25, 2023 at 02:27:09PM +0000, Daniel P. Berrangé wrote:
If libvirt is built in client only mode, the libvirtd/virtqemud/etc
daemons won't exist. If the client is told to connect to a local
hypervisor, it'll see the socket doesn't exist, try to spawn the
daemon and then re-try connecting to the socket for a few seconds.
Ultimately this will fail because the daemon doesn't exist and the
user gets an error message

 error: Failed to connect socket to '/run/user/1000/libvirt/virtqemud-sock': No such file or directory

technically this is accurate, but it doesn't help identify the root
cause. With this change it will now report

 error: binary 'virtqemud' does not exist in $PATH: No such file or directory

and will skip all the socket connect retries

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>

Reviewed-by: Martin Kletzander <mkletzan@xxxxxxxxxx>

---
src/rpc/virnetsocket.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/rpc/virnetsocket.c b/src/rpc/virnetsocket.c
index 8280bda007..bb2e0c5d3d 100644
--- a/src/rpc/virnetsocket.c
+++ b/src/rpc/virnetsocket.c
@@ -123,9 +123,19 @@ VIR_ONCE_GLOBAL_INIT(virNetSocket);
#ifndef WIN32
static int virNetSocketForkDaemon(const char *binary)
{
-    g_autoptr(virCommand) cmd = virCommandNewArgList(binary,
-                                                     "--timeout=120",
-                                                     NULL);
+    g_autofree char *binarypath = virFindFileInPath(binary);
+    g_autoptr(virCommand) cmd = NULL;
+
+    if (!binarypath) {
+        virReportSystemError(ENOENT,
+                             _("binary '%s' does not exist in $PATH"),
+                             binary);
+        return -1;
+    }
+
+    cmd = virCommandNewArgList(binarypath,
+                               "--timeout=120",
+                               NULL);

    virCommandAddEnvPassCommon(cmd);
    virCommandAddEnvPass(cmd, "XDG_CACHE_HOME");
--
2.39.0

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