Re: [Xen-devel] [PATCH 3/3]xl: Add "xl rename" command

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On Friday 07 May 2010 17:45:25 Stefano Stabellini wrote:
> On Fri, 7 May 2010, Yang Hongyang wrote:
> > Hi Keir, Stefano,
> >
> > It's based on my previous 2 patchs: Add "xl domid" command / Add "xl
> > domname" command
> >
> > ==========================================================
> >
> > Add "xl rename" command, a clone of "xm rename".
> >
> > Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
> >
> > diff -r 357eab43f7ee -r 636a21458395 tools/libxl/xl_cmdimpl.c
> > --- a/tools/libxl/xl_cmdimpl.c      Fri May 07 20:06:28 2010 +0800
> > +++ b/tools/libxl/xl_cmdimpl.c      Fri May 07 22:01:41 2010 +0800
> > @@ -1227,6 +1227,9 @@
> >      } else if (!strcmp(command, "domname")) {
> >          printf("Usage: xl domname <DomainId>\n\n");
> >          printf("Convert a domain id to domain name.\n");
> > +    } else if (!strcmp(command, "rename")) {
> > +        printf("Usage: xl rename <Domain> <NewDomainName>\n\n");
> > +        printf("Rename a domain.\n");
> >      }
> >  }
> >
> > @@ -3024,3 +3027,45 @@
> >
> >      exit(0);
> >  }
> > +
> > +int main_rename(int argc, char **argv)
> > +{
> > +    int opt;
> > +    char *dom;
> > +    char *new_name;
> > +    xs_transaction_t t;
> > +
> > +    while ((opt = getopt(argc, argv, "h")) != -1) {
> > +        switch (opt) {
> > +        case 'h':
> > +            help("rename");
> > +            exit(0);
> > +        default:
> > +            fprintf(stderr, "option `%c' not supported.\n", opt);
> > +            break;
> > +        }
> > +    }
> > +
> > +    dom = argv[optind++];
> > +    if (!dom || !argv[optind]) {
> > +        fprintf(stderr, "'xl rename' requires 2 arguments.\n\n");
> > +        help("rename");
> > +        exit(1);
> > +    }
> > +
> > +    find_domain(dom);
> > +    new_name = argv[optind];
> > +
> > +retry_transaction:
> > +    t = xs_transaction_start(ctx.xsh);
> > +    if (libxl_domain_rename(&ctx, domid, common_domname, new_name, t)) {
> > +        fprintf(stderr, "Can't rename domain '%s'.\n", dom);
> > +        exit(1);
> > +    }
> > +
> > +    if (!xs_transaction_end(ctx.xsh, t, 0))
> > +        if (errno == EAGAIN)
> > +            goto retry_transaction;
> > +
> > +    exit(0);
> > +}
>
> There is no need to explicitly handle the transaction here, just pass 0
> to libxl_domain_rename.
> In the near future libxl_domain_rename won't take a transaction anymore
> (libxl clients shouldn't know about xenstore).

Setting the domain name must be already implemented somewhere
used by xl create.

I think, with these new commands there are some refactorings possible
resulting in less fragmented code.

Christoph


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