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qemu: command: Report stderr from qemu-bridge-helper

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There's a couple reports of things failing in this area (bug 1259070),
but it's tough to tell what's going wrong without stderr from
qemu-bridge-helper. So let's report stderr in the error message

Couple new examples:

virbr0 is inactive:
internal error: /usr/libexec/qemu-bridge-helper --use-vnet --br=virbr0 --fd=21: failed to communicate with bridge helper: Transport endpoint is not connected
stderr=failed to get mtu of bridge `virbr0': No such device

bridge isn't on the ACL:
internal error: /usr/libexec/qemu-bridge-helper --use-vnet --br=br0 --fd=21: failed to communicate with bridge helper: Transport endpoint is not connected
stderr=access denied by acl file

(cherry picked from commit db35beaa1d276cc229dcbbc8460ce2fccdda5084)
This commit is contained in:
Cole Robinson 2015-09-10 12:35:00 -04:00
parent 26c8c3ed35
commit d9d3a88cb7
1 changed files with 22 additions and 2 deletions
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24
src/qemu/qemu_command.c
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@ -285,6 +285,7 @@ static int qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
unsigned int flags)
{
virCommandPtr cmd;
char *errbuf = NULL, *cmdstr = NULL;
int pair[2] = { -1, -1 };
if ((flags & ~VIR_NETDEV_TAP_CREATE_VNET_HDR) != VIR_NETDEV_TAP_CREATE_IFUP)
@ -300,6 +301,8 @@ static int qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
virCommandAddArgFormat(cmd, "--use-vnet");
virCommandAddArgFormat(cmd, "--br=%s", brname);
virCommandAddArgFormat(cmd, "--fd=%d", pair[1]);
virCommandSetErrorBuffer(cmd, &errbuf);
virCommandDoAsyncIO(cmd);
virCommandPassFD(cmd, pair[1],
VIR_COMMAND_PASS_FD_CLOSE_PARENT);
virCommandClearCaps(cmd);
@ -314,9 +317,24 @@ static int qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
do {
*tapfd = recvfd(pair[0], 0);
} while (*tapfd < 0 && errno == EINTR);
if (*tapfd < 0) {
virReportSystemError(errno, "%s",
_("failed to retrieve file descriptor for interface"));
char ebuf[1024];
char *errstr = NULL;
if (!(cmdstr = virCommandToString(cmd)))
goto cleanup;
virCommandAbort(cmd);
if (errbuf && *errbuf &&
virAsprintf(&errstr, "\nstderr=%s", errbuf) < 0)
goto cleanup;
virReportError(VIR_ERR_INTERNAL_ERROR,
_("%s: failed to communicate with bridge helper: %s%s"),
cmdstr, virStrerror(errno, ebuf, sizeof(ebuf)),
errstr ? errstr : "");
VIR_FREE(errstr);
goto cleanup;
}
@ -327,6 +345,8 @@ static int qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
}
cleanup:
VIR_FREE(cmdstr);
VIR_FREE(errbuf);
virCommandFree(cmd);
VIR_FORCE_CLOSE(pair[0]);
return *tapfd < 0 ? -1 : 0;