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Re: [Libguestfs] Plans for changing libguestfs appliance building

On 08/16/2010 06:40 PM, Richard W.M. Jones wrote:
On Mon, Aug 16, 2010 at 10:17:30AM +0800, Jin Xin Zheng wrote:
The virtual cdrom device in qemu will be readonly (is that right?).

Then how are you going to tune the boot process as I know it would
require writing to the filesystem.
I'm not aware of us needing to write to the root filesystem during
boot (well, there is one place where we do 'mkdir -p /sysroot' but
that can be fixed).

However there is an issue that we modify configuration files in the
daemon, in particular /etc/lvm/lvm.conf, which would require either
making this directory a tmpfs or using some other method to make root


Are you sure all the binary utils inside the appliance will not write
logging files when running?

In fact when I saw this the first thing came up to my head was that our
modified source for doing gcov -- we could collect the .gcda files in
the build directory after libguestfs was invoked. But the guestfsd which
runs inside the appliance produces the .gcda files in the temp ramfs.
We have made a pretty lot of effort in order to tar-out these files
before the subprocess was killed.

If the filesystem is readonly then I'll have to do more to allow guestfsd
to write debugging coverage info into a writable place. However this is
not a problem for libguestfs, it's just a problem for me...


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