Re: [Xen-devel] [OSSTEST Nested PATCH 2/6] Add and expose some testsupport APIs

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Mon, 2015-03-23 at 17:19 +0000, Wei Liu wrote:
> On Mon, Mar 23, 2015 at 04:20:08PM +0000, Pang, LongtaoX wrote:
> > > 
> > > > > > The editconfig_cd thing -- yet another thing which Ian questioned
> > > > > > and which it was agreed you would change but you haven't.
> > > > > >
> > > > > For this question, I have sent a mail about it.(2015-03-04) After
> > > > > finishing L1 guest VM installation, we need to change L1 guest boot
> > > > > sequence from ISO image to hard disk, we need modify the "boot=cd" ,
> > > >
> > > > Do you? As Ian asked before, why is guest_editconfig_nocd  not
> > > > sufficient? It removes the CD from the virtual drive, meaning that
> > > > "boot=dc" will fail to boot from d and fallthru to c.
> > > >
> > > > >  also need to enable 'nestedhvm' feature in hvm configure file,
> > > >
> > > > This certainly doesn't belong in a function called
> > > > guest_editconfig_cd, since it has nothing to do with cds at all.
> > > >
> > > > Anyway, it's not clear why you need to edit this into the nestedhvm
> > > > configuration, instead of adding it when the configuration is created
> > > > via more_prepareguest_hvm. What harm is there in enabling this during
> > > > guest install?
> > > >
> > > I will try it.
> > > 
> > Re-use 'guest_ediconfig_nocd', after finishing L1 installation, it could 
> > boot into L1 OS, but failed to install packages( such as lvm2, rsync, 
> > bridge-utils ....) via Debian repo in L1, as below msg:
> > root@nested:~# apt-get install lvm2 --no-install-recommends -y
> > Reading package lists... Done
> > Building dependency tree
> > Reading state information... Done
> > The following extra packages will be installed:
> >   libdevmapper-event1.02.1 libreadline5
> > The following NEW packages will be installed:
> >   libdevmapper-event1.02.1 libreadline5 lvm2
> > 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
> > Need to get 0 B/767 kB of archives.
> > After this operation, 1,521 kB of additional disk space will be used.
> > Media change: please insert the disc labeled
> >  'Debian GNU/Linux 7.6.0 _Wheezy_ - Official amd64 DVD Binary-1 
> > 20140712-14:11'
> > in the drive '/media/cdrom/' and press enter
> > 
> > I checked the 'sources.list' file in L1, because L1 Debian OS assume that 
> > ISO Image as repo, but the ISO image does not exist actually.
> > Since '$gho->{Rimage}' is replaced as ' $emptyiso' in ' 
> > guest_ediconfig_nocd', maybe it is not sufficient for nested test.
> > If keep to re-use ' guest_ediconfig_nocd' , is there any approach to 
> > setting guest's repo in osstest system? 
> > 
> > 
> 
> Here are my 2 cents. Might be an alternative solution to your problem.
> 
> The reason that we call guest_editconfig_nocd is to prevent the guest
> from booting from CDROM again.
> 
> You can probably invent a function like guest_editconfig_boot_from_hd
> (name subject to improvement) to switch "boot=dc" (which is the default
> value in more_prepareguest_hvm) to "boot=cd".
> 
> That way you can boot from hard drive while at the same time keep the
> CDROM filled.

That might work, but only so long as all of our dependencies happen to
be on the install media which was used. So the preference IMHO should be
to enable the network apt repositories in the guest and get rid of any
cdrom related ones. This will also make the guest more consistent with
the L0 host installations.

Ian.


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