[libvirt PATCH v2] rpc: don't try to spawn non-existant daemon
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 $PATH: No such file or directory
and will skip all the socket connect retries
Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com>
---
Last time it was suggested that virCommandGetBinaryPath could be
extended to always check whether the binary exists. I started
doing that and realized it was a bad idea as this method runs in
a context which might not have permission to access to the binary
we are about to run, as we've not changed user/group ID yet. So
I'm re-posting this targetted fix, with format string fixup.
src/rpc/virnetsocket.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/src/rpc/virnetsocket.c b/src/rpc/virnetsocket.c
index b58f7a6b8f..0215c99c73 100644
--- a/src/rpc/virnetsocket.c
+++ b/src/rpc/virnetsocket.c
@@ -123,9 +123,19 @@ VIR_ONCE_GLOBAL_INIT(virNetSocket);
#ifndef WIN32
static int virNetSocketForkDaemon(const char *binary)
{
- g_autoptr(virCommand) cmd = virCommandNewArgList(binary,
- "--timeout=120",
- NULL);
+ g_autofree char *binarypath = virFindFileInPath(binary);
+ g_autoptr(virCommand) cmd = NULL;
+
+ if (!binarypath) {
+ virReportSystemError(ENOENT,
+ _("binary '%1$s' does not exist in
$PATH"),
+ binary);
+ return -1;
+ }
+
+ cmd = virCommandNewArgList(binarypath,
+ "--timeout=120",
+ NULL);
virCommandAddEnvPassCommon(cmd);
virCommandAddEnvPass(cmd, "XDG_CACHE_HOME");
--
2.41.0