Re: [Libguestfs] getting guestfs_rsync_out to work
Richard-
On Mon, Feb 09, 2015 at 08:27:22AM -0600, Jeff Brower wrote:
> Yes we know that it doesn't know. We'd be ok to re-launch the image
> to pick up changes except for the time it takes (if we could get
> into 1 to 10 msec range it would be ok).
There's no feasible way to start a Linux kernel in under about 1-2
seconds. It just takes that long for the kernel to initialize itself.
Even if you use the User-mode Linux backend (which just runs vmlinux
as a userspace process) you'll experience approximately the same
overhead.
Ok got it. Thanks again for your reply. We tried guestfs_drop_caches() as follows:
while(1) {
guestfs_mount(g, "/dev/sda2", "/");
printf("%s\n", guestfs_cat(g, "/HostShared/temp.txt"));
guestfs_umount(g, "/");
guestfs_drop_caches(g, 3);
usleep(1000*1000);
}
and still we cannot see changes made to temp.txt (from inside the Win7 guest VM)
while this loop continues to run on the host Linux. We still have to re-launch the
image to see changes.
In general, it would be great if the "kernel load" and "disk refresh /
sync"
functions in guestfs_launch() could be separated. If there was a way to do read-only
file sharing, a very limited subset of what virtFs/9p can do, that would be great for
Win guests.
-Jeff