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Re: [virt-tools-list] [PATCH] python-virtinst: type inconsistencies in 'vcpus'



Hi,

I looked into this problem further and now feel certain that my previous
patch (change type of '--vcpus' option) was correct and can fix it.


Details:

I run virt-install with the arguments,

"--name foo --nodisks --ram 256 \
--cdrom /srv/isos/rhel-server-5.6-i386-dvd.iso \
--hvm --accelerate --vnc \
--check-cpu \
--vcpus 2"

and got the following traceback:

...
gdb) r "/root/virtinst-debug.py"
Starting program: /usr/bin/python "/root/virtinst-debug.py"
[Thread debugging using libthread_db enabled]
Detaching after fork from child process 11189.
ERROR    Traceback (most recent call last):
  File "/root/virtinst-debug.py", line 25, in <module>
    _vi.main()
  File "/root/vi/vi.py", line 1259, in main
    guest = build_guest_instance(conn, options)
  File "/root/vi/vi.py", line 970, in build_guest_instance
    cli.get_vcpus(options.vcpus, options.check_cpu, guest)
  File "/usr/lib/python2.7/site-packages/virtinst/cli.py", line 733, in get_vcpus
    "but performance will be poor. ") % (vcpus, cpu_num)
TypeError: %d format: a number is required, not str
None
ssato gescom%

(note: _vi.main is just an wrapper calls virt-install.main with the
arguments set.)


and get_vcpus() in /usr/lib/python2.7/site-packages/virtinst/cli.py
looks like this:

def get_vcpus(vcpus, check_cpu, guest, image_vcpus=None):
    if vcpus is None and image_vcpus is not None:
        vcpus = int(image_vcpus)

    parse_vcpu_option(guest, vcpus, image_vcpus)

    conn = guest.conn
    if check_cpu:
        hostinfo = conn.getInfo()
        cpu_num = hostinfo[4] * hostinfo[5] * hostinfo[6] * hostinfo[7]
        if not vcpus <= cpu_num:
            msg = _("You have asked for more virtual CPUs (%d) than there "
                    "are physical CPUs (%d) on the host. This will work, "
                    "but performance will be poor. ") % (vcpus, cpu_num)

            askmsg = _("Are you sure? (yes or no)")

            if not prompt_for_yes_or_no(msg, askmsg):
                nice_exit()


The type of cpu_num is obviously int:

$ python -c "import libvirt; c = libvirt.open(None); print c.getInfo()[4:]"
[1, 1, 1, 2]
$

however vcpus is not int always. Its type is str in some cases (came
from the --vcpus option), and therefore, the error "TypeError: %d
format:..." occured, I think.


- satoru

On Mon, Feb 07, 2011 at 02:55:14PM +0900, Satoru SATOH wrote:
> Hi,
> 
> I encountered a possible bug in python-virtinst (0.500.5-1.fc14) causing
> the type error such as:
> 
> # virt-install --connect=qemu:///system --name=rhel-5-4-vm-0 --ram=256 \
> --arch=i686 --vcpu=2 --keymap=en-us --os-type=linux \
> --location=http://192.168.151.1/contents/RHEL/5/4/Server/i386/ \
> --os-variant=rhel5 --disk \
> path=/var/lib/libvirt/images/rhel-5-4-vm-0/disk-1.qcow2,bus=virtio,format=qcow2,cache=none \
> --network=network:net-1,model=virtio \
> --network=network:net-1,model=virtio \
> --network=network:net-2,model=virtio \
> --network=network:net-2,model=virtio \
> --extra-args="ks=http://192.168.151.1/autoinst/rhel-5-4-i386-min.ks.cfg \
> ksdevice=eth0" --check-cpu --hvm --accelerate --vnc --noreboot \
> --noautoconsole --wait=20
> ERROR    %d format: a number is required, not str
> 
> 
> I'm not really sure about the cause of this issue but it seems the
> following patch may fix it.
> 
> This patch tries to fix the inconsistencies of type 'vcpu' in cli.py of
> python-virtinst.
> 
> - satoru
> 
> 
> --- /usr/lib/python2.7/site-packages/virtinst/cli.py.org	2011-02-07 14:19:21.554513828 +0900
> +++ /usr/lib/python2.7/site-packages/virtinst/cli.py	2011-02-07 14:19:55.955030458 +0900
> @@ -513,7 +513,7 @@
>              failed = True
>  
>  def vcpu_cli_options(grp):
> -    grp.add_option("", "--vcpus", type="string", dest="vcpus",
> +    grp.add_option("", "--vcpus", type="int", dest="vcpus",
>          help=_("Number of vcpus to configure for your guest. Ex:\n"
>                 "--vcpus 5\n"
>                 "--vcpus 5,maxcpus=10\n"


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