On Mon, Mar 27, 2017 at 20:03:42 -0400, John Ferlan wrote:
>
>
> On 03/27/2017 05:19 PM, Jiri Denemark wrote:
> > On Mon, Mar 27, 2017 at 13:42:22 -0400, John Ferlan wrote:
> >> https://bugzilla.redhat.com/show_bug.cgi?id=1398087
> >>
> >> Clean up the virsh man page description for --pool-create-as in order
> >> to better describe how the various arguments are used when creating
> >> (or defining) a logical pool.
> >>
> >> Also modify the storage pool XML parsing algorithm to check for the
> >> mismatched "name" and "source-name".
> >>
> >> Signed-off-by: John Ferlan <jferlan at redhat.com>
> >> ---
> >> src/conf/storage_conf.c | 8 ++++++++
> >> tools/virsh.pod | 7 +++++++
> >> 2 files changed, 15 insertions(+)
> >>
> >> diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c
> >> index 585ca71..5213503 100644
> >> --- a/src/conf/storage_conf.c
> >> +++ b/src/conf/storage_conf.c
> >> @@ -760,6 +760,14 @@ virStoragePoolDefParseXML(xmlXPathContextPtr ctxt)
> >> if (VIR_STRDUP(ret->source.name, ret->name) < 0)
> >> goto error;
> >> }
> >> + if (ret->type == VIR_STORAGE_POOL_LOGICAL &&
> >> + STRNEQ(ret->name, ret->source.name)) {
> >> + virReportError(VIR_ERR_XML_ERROR,
> >> + _("for a logical pool, the pool name='%s' "
> >> + "must match the pool source name='%s'"),
> >> + ret->name, ret->source.name);
> >> + goto error;
> >
> > Wrong indentation...
> >
> >> + }
> >
> > but why exactly is this forbidden now? I should be able to create a pool
> > with a (libvirt's) name which differs from the (system's) name of the
> > volume group, shouldn't I? And apparently it used to work while it is
> > not working now after this patch as failing virt-manager builds on
> > ci.centos.org suggest.
>
> If 'source.name' isn't supplied it defaults to ret->name. The ret->name
> is supposed to be the Volume Group name (it's the "unique" to the host
> name). Although I suppose it could be something different, but if only
> the name is required in order to define/create the pool, then how does
> one "ensure" that the name provided is the volume group name.
Sure, if only one name is provided, it's OK to use it in both places
(i.e., pool name volume group name).
> Still I certainly suppose someone could do something different, so I
> suppose this part could be reverted.
Definitely, it has to be reverted. Otherwise existing pools which don't
follow this logic will just disappear when libvirtd starts again.
> FWIW: The 'source.name' is used is by the logical backend for various
> vg* and lv* commands. So if it's not the Volume Group name, then
> commands fail (as seen in the bz).
Indeed, source.name has to be to volume group name.
> I really think it's just "smart sense" to make them be the same to
> avoid "confusion".
Perhaps, but it doesn't mean we should forbid pools with different
names. And especially when such pools used to work just fine.
Jirka