[Libguestfs] About Guest running Tiny Core Linux

[Richard W.M. Jones]

On Mon, Mar 24, 2014 at 08:22:46AM -0400, Arup Raton Roy wrote:
> Hi Richard,
> 
> Thanks a lot for your prompt response. I am enumerating the steps that I
> followed during the provisioning, if it helps.

Thanks ...

> 1. These are the commands that I used to create the disk image.
> 
> qemu-img create -f qcow2 base_VM.qcow2 512M
> kvm -m 512 -cdrom Core-current.iso -hda base_VM.qcow2 -boot d -net
> nic,macaddr=00:00:00:00:cc:10 -net
> tap,script=/etc/ovs-ifup0,downscript=/etc/ovs-ifdown0
> 
> 2. a) The output of qemu-img
> qemu-img info base_VM.qcow2
> image: images/base_VM.qcow2
> file format: qcow2
> virtual size: 512M (536870912 bytes)
> disk size: 46M
> cluster_size: 65536
> 2. b)  virt-filesystems --all --long -h -a base_VM.qcow2
> Name       Type        VFS   Label  MBR  Size  Parent
> /dev/sda1  filesystem  ext4  -      -    512M  -
> /dev/sda1  partition   -     -      83   512M  /dev/sda
> /dev/sda   device      -     -      -    512M  -

In my previous analysis I didn't see that TCL actually installs itself
to a persistent disk.  As shown above and in your trace, it's creating
an ext4 partition on the persistent disk.

I installed TCL to a disk to see what happens.

$ guestfish --ro -a tcl.qcow2 
Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.

Type: 'help' for help on commands
      'man' to read the manual
      'quit' to quit the shell

><fs> run
><fs> list-filesystems 
/dev/sda1: ext4
><fs> mount /dev/sda1 /
><fs> ll /
total 28
drwxr-xr-x  4 root root  4096 Mar 24 12:56 .
drwxr-xr-x 19 root root  4096 Mar 24 12:57 ..
drwx------  2 root root 16384 Mar 24 12:56 lost+found
drwxr-xr-x  4 1001 ftp   4096 Mar 24 12:56 tce

><fs> ll /tce/
total 20
drwxr-xr-x 4 1001 ftp  4096 Mar 24 12:56 .
drwxr-xr-x 4 root root 4096 Mar 24 12:56 ..
drwxr-xr-x 3 1001 ftp  4096 Mar 24 12:56 boot
-rw-r--r-- 1 root root    0 Mar 24 12:56 mydata.tgz
-rw-r--r-- 1 1001 ftp   449 Mar 24 12:56 onboot.lst
drwxr-xr-x 2 1001 ftp  4096 Mar 24 12:56 optional

It's still using an initramfs, so it's unlikely we can make inspection
show the real TCL filesystem.  But we should certainly be able to
improve on current behaviour (ie fix RHBZ#1079734).

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines.  Tiny program with many
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