[Qemu-devel] [Bug 676029] Re: Silently fail with wrong vde socket dir

[Michael Tokarev]

There's no need to add any more specific information.  The bug's in the
code in qemu.

net/vde.c:

static int net_vde_init(VLANState *vlan, const char *model,
                        const char *name, const char *sock,
                        int port, const char *group, int mode)
{
...
    vde = vde_open(init_sock, (char *)"QEMU", &args);
    if (!vde){
        return -1;
    }
...
}

There's no message generated there.  Callers merely pass the failure up
the road, where it's finally handled as exit(1).  If _anything_ is wrong
in vde_open() (which can fail due to variety of reasons, including wrong
path to the listening socket and what not), nothing will indicate that,
just a trivial, silent exit.

** Changed in: qemu
       Status: New => Confirmed

-- 
Silently fail with wrong vde socket dir
https://bugs.launchpad.net/bugs/676029
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Status in QEMU: Confirmed

Bug description:
Hi,

Using qemu 0.12.5, kvm silently fail with exit code 1 when using -net vde and a 
wrong path for sock. Actually, the sock option is mean to be the socket dir of 
the vde_switch, not the socket itself.

With -net vde,sock=/var/run/vde/vde0/ctl , strace ends with the following 
messages :

connect(7, {sa_family=AF_FILE, path="/var/run/vde/vde0/ctl/ctl"}, 110) = -1 
ENOTDIR (Not a directory)
close(7)                                = 0
close(8)                                = 0
exit_group(1)                           = ?
root ~# 

Please add a meaningful message.

Regards,
Étienne