[libvirt] [PATCH] virsh: add --domain option for domain-to-native
Julio Faracco
jcfaracco at gmail.com
Mon May 29 20:50:46 UTC 2017
It would be nice to include the changes into documentation, wouldn't it?
tools/virsh.pod has an entry for example.
2017-05-29 16:40 GMT-03:00 Dan <srwx4096 at gmail.com>:
> On Mon, May 29, 2017 at 08:53:18PM +0200, Martin Kletzander wrote:
>> On Mon, May 29, 2017 at 02:25:03PM -0400, Dan wrote:
>> > On Tue, May 16, 2017 at 11:41:55AM +0200, Martin Kletzander wrote:
>> > > On Mon, May 15, 2017 at 04:29:48AM -0400, Daniel Liu wrote:
>> > > > Fix bug 835476[1].
>> > >
>> > > It's enough to mention it below (as you did).
>> > >
>> > > > virsh: add [--domain DOMAIN] option to domxml-to-native DOMAIN COMMAND
>> > >
>> > > This first line is already in the subject.
>> > >
>> > > > Add support for the following syntax:
>> > > > domxml-to-native <format> { [--domain DOMAIN] | [XML] }, i.e., it supports
>> > > > either designating domain (domain id, uuid, or name), or path to XML domain
>> > > > configuration file.
>> > > >
>> > >
>> > > I would reword this a little bit. How would you feel about something
>> > > along the lines of:
>> > >
>> > > 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 $dom | virsh domxml-to-native /dev/stdin`.
>> > >
>> > > Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=835476
>> > >
>> > I made changes accordingly in the version 2 of this patch.
>> > > > E.g.:
>> > > > virsh domxml-to-native qemu-argv --domain RHEL7.3 # domain name
>> > > > virsh domxml-to-native qemu-argv --domain 10 # domain id
>> > > > virsh domxml-to-native qemu-argv dumped_dom.xml # dumped xml
>> > > >
>> > > > [1] https://bugzilla.redhat.com/show_bug.cgi?id=835476
>> > > > ---
>> > > > tools/virsh-domain.c | 54 ++++++++++++++++++++++++++++++++++++++++++----------
>> > > > 1 file changed, 44 insertions(+), 10 deletions(-)
>> > > >
>> > > > diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
>> > > > index 0d19d0e01..a79fd3ab2 100644
>> > > > --- a/tools/virsh-domain.c
>> > > > +++ b/tools/virsh-domain.c
>> > > > @@ -9840,9 +9840,13 @@ static const vshCmdOptDef opts_domxmltonative[] = {
>> > > > .flags = VSH_OFLAG_REQ,
>> > > > .help = N_("target config data type format")
>> > > > },
>> > > > + {.name = "domain",
>> > > > + .type = VSH_OT_DATA,
>> > > > + .flags = VSH_OFLAG_REQ_OPT,
>> > > > + .help = N_("domain name, id or uuid")
>> > > > + },
>> > > > {.name = "xml",
>> > > > .type = VSH_OT_DATA,
>> > > > - .flags = VSH_OFLAG_REQ,
>> > > > .help = N_("xml data file to export from")
>> > > > },
>> > > > {.name = NULL}
>> > > > @@ -9851,30 +9855,60 @@ 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)
>> > >
>> > > If this was already there, you could keep using it. But that's not a
>> > > big deal for me, just some others might not like it.
>> > >
>> > I kept the existing code and only added an additional check for "domain"
>> > in v2, i.e.:
>> >
>> > if (vshCommandOptStringReq(ctl, cmd, "format", &format) < 0 ||
>> > vshCommandOptStringReq(ctl, cmd, "xml", &xml) < 0 ||
>> > vshCommandOptStringReq(ctl, cmd, "domain", &domain) < 0)
>> > return false;
>> > > > + if (vshCommandOptStringReq(ctl, cmd, "format", &format) < 0)
>> > > > + return false;
>> > > > +
>> > > > + if (vshCommandOptStringReq(ctl, cmd, "domain", &domain) < 0)
>> > > > + return false;
>> > > > +
>> > >
>> > > [1] So here you get the domain name/id/uuid ...
>> > >
>> > > > + if (vshCommandOptStringReq(ctl, cmd, "xml", &xml) < 0)
>> > > > return false;
>> > > >
>> > > > - if (virFileReadAll(xmlFile, VSH_MAX_XML_FILE, &xmlData) < 0)
>> > > > + VSH_EXCLUSIVE_OPTIONS_VAR(domain, xml);
>> > > > +
>> > > > + if (domain)
>> > > > + dom = virshCommandOptDomain(ctl, cmd, &domain);
>> > > > +
>> > >
>> > > ... and here you get the object. What do you supply as the third
>> > > parameter? Check what the function does. There's a leak that you will
>> > > fix by getting rid of the lines above [1]. And just supply NULL here.
>> > >
>> > I did not fully get it by "getting rid of the lines above [1]." But I
>>
>> I meant the three lines before the [1] (I used that number in square
>> brackets as a link. That's why I said "Check what the function does".
>
> So I deleted the line checking "domain" leaving origin conditional like
> as it was:
>
> if (vshCommandOptStringReq(ctl, cmd, "format", &format) < 0 ||
> vshCommandOptStringReq(ctl, cmd, "xml", &xmlFile) < 0)
>
> However, this change would reulst in error when supplying "domain" as the
> string of domain needs to be accquired, which was achieved by calling
> vshCommandOptStringReq(ctl, cmd, "domain", &domain).
>
> So far, the exception handeling and normal return are the following:
>
>
> $ virsh -c qemu:///system list --all
> Id Name State
> ----------------------------------------------------
> 2 ubuntu1404 running
> - RHEL7.3 shut off
>
> $ virsh -c qemu:///system domxml-to-native
> error: command 'domxml-to-native' requires <format> option
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv
> error: need either domain (ID, UUID, or name) or domain XML configuration file path
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv 2
> error: Failed to open file '2': No such file or directory
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv --domain 2 => OK
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv dl_dumpxml170422.xml => OK
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv dl_dumpxml170529.xml # Wrong XML
> error: convert from domain XML to native command failed
> error: (domain_definition):111: expected '>'
> </domain>
> -------^
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv --xml dl_dumpxml170422.xml => OK
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv --xml dl_dumpxml170422.xml --domain
> error: expected syntax: --domain <string>
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv --xml dl_dumpxml170422.xml --domain 3
> error: Options --domain and --xml are mutually exclusive
>
> $ virsh -c qemu:///system domxml-to-native qemu-argv --domain 3
> error: failed to get domain '3'
> error: Domain not found: no domain with matching name '3'
>
> Best,
>
> Dan
>
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