Re: [libvirt] [PATCH v2] virsh: add [--domain DOMAIN] option to domxml-to-native DOMAIN COMMAND

On Fri, Jun 02, 2017 at 05:18:52AM -0400, Dan wrote: > On Tue, May 30, 2017 at 08:45:37AM +0200, Peter Krempa wrote: > > On Mon, May 29, 2017 at 14:08:53 -0400, Daniel Liu wrote: > > > The option allows someone to run domain-to-native on already existing > > > domain without the need of supplying their XML. It is basically > > > wrapper around 'virsh dumpxml | virsh domxml-to-native /dev/stdin'. > > > Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=835476 > > > --- > > > tools/virsh-domain.c | 52 ++++++++++++++++++++++++++++++++++++++++------------ > > > 1 file changed, 40 insertions(+), 12 deletions(-) > > > > > > diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c > > > index ccb514ef9..929f9c896 100644 > > > --- a/tools/virsh-domain.c > > > +++ b/tools/virsh-domain.c > > > > [...] > > > > > @@ -9859,30 +9863,54 @@ static const vshCmdOptDef opts_domxmltonative[] = { > > > static bool > > > cmdDomXMLToNative(vshControl *ctl, const vshCmd *cmd) > > > { > > > - bool ret = true; > > > + bool ret = false; > > > const char *format = NULL; > > > - const char *xmlFile = NULL; > > > - char *configData; > > > - char *xmlData; > > > + const char *domain = NULL; > > > + const char *xml = NULL; > > > + char *xmlData = NULL; > > > + char *configData = NULL; > > > unsigned int flags = 0; > > > virshControlPtr priv = ctl->privData; > > > + virDomainPtr dom = NULL; > > > > > > if (vshCommandOptStringReq(ctl, cmd, "format", &format) < 0 || > > > - vshCommandOptStringReq(ctl, cmd, "xml", &xmlFile) < 0) > > > + vshCommandOptStringReq(ctl, cmd, "xml", &xml) < 0 || > > > + vshCommandOptStringReq(ctl, cmd, "domain", &domain) < 0) > > > > You don't need this variable after the check below, so it's pointless to > > extract it. > > > > > return false; > > > > > > - if (virFileReadAll(xmlFile, VSH_MAX_XML_FILE, &xmlData) < 0) > > > + VSH_EXCLUSIVE_OPTIONS_VAR(domain, xml); > > > > This macro is documented to work only on booleans, please don't use it > > on pointers. > > > > > + > > > + if (domain) { > > > + if (!(dom = virshCommandOptDomain(ctl, cmd, NULL))) > > > + return false; > > > + } > > > + > > > + if (dom) { > > > + xmlData = virDomainGetXMLDesc(dom, flags); > > > + } else if (xml) { > > > + if (virFileReadAll(xml, VSH_MAX_XML_FILE, &xmlData) < 0) > > > + goto cleanup; > > > + } > > > + > > > + if (!xmlData) { > > > + vshError(ctl, "%s", > > > + _("need either domain (ID, UUID, or name) or domain XML configuration file path")); > > > > This line is very long. > > > > > return false; > > > > You'll leak 'dom' here if it was looked up, but getting of the XML > > failed. > > > > Also the message is kind of wrong in that case, since you've provided a > > valid name, but the XML could not be requested > > > > > + } > > > > > > - configData = virConnectDomainXMLToNative(priv->conn, format, xmlData, flags); > > > - if (configData != NULL) { > > > - vshPrint(ctl, "%s", configData); > > > - VIR_FREE(configData); > > > + if (!(configData = virConnectDomainXMLToNative(priv->conn, format, xmlData, flags))) { > > > + vshError(ctl, "%s", > > > + _("convert from domain XML to native command failed")); > > > > For 'xen' the output is not really a command, so this message also is > > not very good. > > > I found out it is actually XM config files from the domxml-to-native > command > https://libvirt.org/drvxen.html#xmlexport > > So for v4 of this patch, I am going to delete the "command" word, i.e.: > vshError(ctl, "%s", _("convert from domain XML to native failed")); > That sentence doesn't make sense. "Conversion from domain XML to native representation failed" would make more sense, but I don't know why you are complicating it for yourself. There was no vshError() before your patch and I don't see why it would be needed.

> some test cases when this error happened: > > > $ virsh -c qemu:///system domxml-to-native qemu-argv dl_dumpxml170529.xml > error: convert from domain XML to native command failed > error: (domain_definition):111: expected '>' > </domain> > -------^ > > $ echo $? > 1 > $ virsh -c qemu:///system domxml-to-native qemu-argv dl_test_dumpxml.xml > error: convert from domain XML to native command failed > error: invalid argument: could not find capabilities for arch=i686 domaintype=test > > Btw, for the first error, the erroneous part of my test xml was actually > the first line of a domain xml dump; I deleted the character 'n' in > 'domain' string: > > <domai type='kvm' id='1'> > <name>ubuntu1404</name> > <uuid>e8742104-ecac-2ed9-a9d6-e1x15319374f</uuid> > > i.e., the error message did not detect the true invalidity of > the xml file. But this is not a big issue, right? > Well, it actually did: error: (domain_definition):111: expected '>' This is the error from libxml2 forwarded through libvirt. > P.S. Is there anything more I need to change for this PATCH? > > Thanks, > > Dan > > > } else { > > > - ret = false; > > > + vshPrint(ctl, "%s", configData); > > > + ret = true; > >